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HOW-TO Pressure & Vacuum Test On A Chainsaw - Leak Down Test

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HOW-TO Pressure & Vacuum Test On A Chainsaw - Leak Down Test
Can't find what's causing your chainsaw to not run properly? You may need to do a leak down test.
Don’t forget to click the 🔔 to turn on Video Notifications for more money saving videos and tips, featuring all the brands like Stihl, Husky, Husqvarna, Honda, Echo, Tecumseh, Dolmar, Makita, Poulan, Ariens, Briggs and Stratton, Murray, John Deere, Craftsman, MTD, AYP, etc.
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If you enjoy my small engine repair videos make sure to comment, share, thumbs up and subscribe. Thanks for watching!
Easy to follow and thorough step by step tutorials do it yourself (DIY) to help you with your broken lawn and garden equipment including snowblowers.
I do my best to teach you how to easily diagnose problems the fastest, quickest and most efficient way with real repairs beyond just replacing a spark plug. These tips are for both the homeowner and shop owner.
Whether it be a handheld, two stroke, two cycle engine like a chainsaw, weed eater, weed wacker, string trimmer, grass trimmer, line trimmer, hedge trimmer, strimmer, brush cutter, leaf blower, or four stroke, four cycle units like a lawnmower, wood splitter, lawn tractor, snowblower, pressure washer, generator or a ride on mower that needs parts installed or replaced, I’m your go-to guy.
My favorite brands of spark plugs are NGK and Champion and are the ones I recommend.
I’ve been a small engine mechanic for many decades and also run my own repair shop so my videos are loaded with tips and tricks that I have learned and want to share with you. You will also find many tool and product reviews from top brands on my channel as well.
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I want "DON THE SMALL ENGINE DOCTOR" on RU-vid to save you time, frustration and most importantly, MONEY with my HOW-TO videos!
Due to factors beyond the control of DONYBOY73 “The Small Engine Doctor”, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. DONYBOY73 “The Small Engine Doctor” assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. DONYBOY73 “The Small Engine Doctor” recommends safe practices when working with power tools, hand tools, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of DONYBOY73 “The Small Engine Doctor”, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not DONYBOY73 “The Small Engine Doctor".
#donyboy73 #db73 #stihlchainsaws

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5 сен 2024

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Комментарии : 228

@jamesgingin590 4 года назад

I like how you get right to the point and don't dribble on about things that don't matter. You're the best small engine mechanic on RU-vid.

@reedjose7624 3 года назад

I know Im asking the wrong place but does anybody know a tool to log back into an Instagram account..? I was stupid lost the account password. I would love any tricks you can give me!

@reedjose7624 3 года назад

@Byron Kelvin I really appreciate your reply. I got to the site through google and I'm trying it out atm. Looks like it's gonna take quite some time so I will reply here later with my results.

@reedjose7624 3 года назад

@Byron Kelvin It did the trick and I now got access to my account again. Im so happy:D Thank you so much you saved my account :D

@byronkelvin912 3 года назад

@Reed Jose Happy to help xD

@num1booger 8 лет назад

DONY, I KNOW WERE ALL HUMAN AND HAVE OPINIONS, I DO NOT UNDERSTAND WHY ANYONE WOULD LEAVE A DIS LIKE (THUMBS DOWN)EVERYTHING IVE WATCHED FROM YOU ALL YOUR KNOWLEDGE IS WONDERFUL FOR US DO IT YOUR SELF FIX IT GUYS.BLESSINGS TO YOU AND ALL READING THISSTEVE IN BEAUMONT CALLY

@donyboy73 8 лет назад

+Steve Hoover jealousy causes people to do that, also other insecure shop owners who don't want people to fix their own stuff

@garyronan5568 7 лет назад

donyboy73 Or A guy that sells new chainsaws!!

@thomasgronek6469 6 лет назад

Big Guy; I was thinking the same thing. If the thumbs down is clicked, a piece of constructive criticism should be left out of courtesy, and for the sake of improving skills and knowledge.

@seansysig 8 лет назад

A very clear & concise troubleshooting video that can solve a saws inability to run! Best Small Engine Repair You Tube Channel!

@donyboy73 8 лет назад

+Sean Signer thanks Sean!

@seanbrenton55 3 года назад

Thanks to this video, I did a rudimentary press/vac test with a big veterinary syringe on my 1978 Stihl 031 and was able to rule out the crank seals. ended up being a deteriorated impulse line. Saved me tons of time and money. Thanks, Don!

@da8ish1 3 года назад

great video! thanks. 6:10 in i think that vacuum may be in inches

@clubdetennisdolbeau-mistas5971 6 лет назад

A REAL PRO. It's great to see you performing as you do. Thanks for all those vids and keep up the good work.

@ralstondaley6448 4 года назад

Your so professional donyboy73

@musketbal 7 лет назад

It was impossible to find anything similar to what Donny uses for the pressure test. What I did was take a large bottle cork (from hardware store) so it fit snug in the bellow with approximately 1/2" of the cork exposed . I then drilled a hole in the cork after the fit check and placed a piece of fuel line through the cork leaving enough exposed to allow for the vacuum pump to be attached. I also covered the top and area around the fuel line with black permatex RTV for a good seal. The bottom was also done in the same fashion. I then used a small hose clamp to keep it secure when installed into the bellow. Not too fancy, but if you can't find the adapter Donny uses, I think this should work.

@SteveRobReviews 8 лет назад

Nice tip Donny . Since I already have an automotive smoke machine I have found it works great as well in testing for all sorts of leaks on small engines too.

@donyboy73 8 лет назад

+Steve Rob that would be nice to have!

@Fireship1 8 лет назад

+donyboy73 you can make one with common materials such as a paint can, a tiki torch wick and some nichrome wire. Google it and or look on eBay for completed ones and kits to make your own. Not expensive at all, work just as good!

@danielh4995 5 лет назад

Man I am glad I read this comment! I hadnt thought of doing that to test for leaks but I will now. I actually have an 038 Mag II that wont idle after a port, polish, and refresh. I suspect the cylinder to crankcase seal is the issue but that will be a great way to confirm.

@earllister2513 6 лет назад

Dony, your videos are extremely helpful! I enjoy the detail and attention you give. I have learned a lot from you! Keep putting out videos !

@Wjones450 7 лет назад

I have used this way of pressure/vac testing for a few years now and it does indeed work very well. like he said tho just make sure your connections to the pump are solid! Also works great for carburetor work

@bird474 8 лет назад

I'd like to see you do a leak down test on a snow blower/lawn mower! : )

@lornaandy969 4 месяца назад

Thanks Dony, first class as usual. What were the symptoms with this saw??

@carlmiller1034 8 лет назад

Great video Don! Thanks for the thorough detail on how to trouble shoot with the use of the pressure and vacuum tests.

@donyboy73 8 лет назад

+James David thanks for watching david

@drewthornton4684 8 лет назад

the old wizard 998 thanks im new to this small engine thing last year i got a whipper snipper fixed and running thanks to don

@coolbluelights 8 лет назад

Crank seals are very important in a 2 stroke

@gtb4 Год назад

One of the best channels I’ve seen. Thank you!😊

@Norwaywildlife 6 лет назад

I like this very good instruction and cool you go that deep as here on the machine repair. Thak you allot ! Keep up the good work. Very helpful for us that has a passion about making small engines run as they are intended to do. I just like to restore them...just for fun.

@gilbertvelazquez1254 8 лет назад

Thank You Dony like all your videos

@donyboy73 8 лет назад

+Gil Velazquez thanks Gil!

@TedSailAwayCost Год назад

Thank you very much Donny , I believe you are the best instructor on small engines . I firmly believe you will be a great teacher in a technical training school in the future . Once again you have solved my chain saw problems and now running like clockwork . Kind regards Ted , west Australia

@snort455 6 месяцев назад

gracias

@ButchElrod 6 лет назад

I'm interested in that adapter, or an idea for a home made adapter, to connect the pump to the bellows.

@phoenixtimber4343 2 года назад

I like your style. Usually I get bored watching videos because there is too much fluff. Your videos are excellent.

@phillipkramer6638 7 лет назад

Pressure I was told almost always is the head gasket when its set up like you had it. Didn't know that. Thanks as always. Your videos are the best and well worth subscribing.

@sglas7102 2 года назад

Last comment, so true. Your explanations and step by step are spot on! Bravo

@jamesmullins3219 8 лет назад

excellent video. Removing the seal employs a knowledgeable mechanics trick... you may consider adding that to your next version of this clop. Great editing. Thanks Dony for another good video

@donyboy73 8 лет назад

+James Mullins thanks, yes I will make a seal removal video

@__oK__ 4 года назад

I think I'll have test my 3 STIHL 010 AV because they all have same symptoms.

@davidschliebe246 5 месяцев назад

Don I just vac-press tested a stihl ms390. It's got great pressure test results. HOWEVER it won't pass the vacuum test. What could cause this result.???

@billtattersfield2895 7 месяцев назад

Great content thanks

@davidthorne6796 8 лет назад

Sweet drill out and pick grip and rip on that seal !!!! That's a sweet time saver, Sir! Thanks again

@rickforsty9410 3 года назад

Very informative!!

@leec12 8 лет назад

Excellent presentation. Timely because I just bought a Mityvac to test my saws that I work on.

@wtbm123 8 лет назад

Good video

@donyboy73 8 лет назад

+wtbm123 thanks

@Chris-Fennimore 8 лет назад

Good video Don. I got a couple 028s that I replaced crank seals on, but still got a leak somewhere. I'll try the pressure test on them.

@GHULAMABBAS-bs4hy 3 года назад

Please make the video of MS 382 chain saw trouble shooting

@johnkosheluk1041 5 лет назад

Plus you have to be careful when you put the pump down it doesn't relice the presher the lever is on the bottom I think bad ida of the miti

@shakirratheriok1857 3 года назад

Sir what happens if chainsaw leaks it bogs down under load....thanks this is most important issue in chanies saws..

@travischandler272 8 лет назад

did you replace the seal with out splitting the case ?

@donyboy73 8 лет назад

+travis chandler yes I just popped it out from the surface

@davidmech2956 2 года назад

Thank you

@smittys19daytona 7 лет назад

it is sad that we live in such a disposable world where 100 an hour labor from a shop, high dollar parts from sthil push it quickly to the need to trash it which makes this information that much more valuable.forced to by import parts, bought a saw ran ok but is basically junk after seeing the scored piston , but I'm really enjoying going through these videos just realized the seals were bad ,lots of oil in the clutch was just going to do the piston now I know the cause thanks great channel

@johnkosheluk1041 5 лет назад

I am a stihl tech I have the same vac tester I made a tool to keep the case at 8 psi ot can be a pain to keep pumping the tester

@yveskc1 8 лет назад

Thanks for sharing!

@friendshipyu 8 лет назад

thorough advice

@miguelcicora6861 2 года назад

I hook my compression tester on 2 different chainsaws 1 working and the other one doesn't both have the same reading 30psi. Any thoughts 💭.

@mcmaster22 8 лет назад

Another Great video as always. Thanks again Dony for sharing with us.

@donyboy73 8 лет назад

+mcmaster22 you're welcome, have a good weekend

@RussellBooth1977 7 лет назад

I did with an air compressor with a Stihl hedge trimmer I rebuilt, one crank seal leaked but I went to the bearing shop & bought 2 of the same sized seals for $15 AUD. The machine had other problems as well but it had no more leaks after that.

@shawnmrfixitlee6478 8 лет назад

Great vid Don , Thanks !!

@xxMacDaddy84xx 8 лет назад

What's the part number for the Stihl adapter with hose connector that you plugged the bellows with? Thanks

@patrickrusca5950 8 лет назад

thanks for doing this video. very clear and helpful. all the best :)

@warrenscott9990 8 лет назад

thanks Don! nice job

@donyboy73 8 лет назад

+Warren Scott thanks

@allenletizia321 3 года назад

Nice job . I think got try that. It might be adjustment on carb Mine will start with spray spray starting fluid . Thanks showing that.

@rolyf100 8 лет назад

It must be tough to make a good living as a small engine mechanic. I say that because the amount of labor required to repair many small engines must be half or more of the value of the engine if repaired. I own a car garage. If one of my techs did this job (looking for air/vacuum leaks) in a car engine the car might be worth $12000 so a $300 repair would be well worthwhile. You use the same knowledge and tools and take the same amount of time and if you tell the owner the bill will be $300 he will tell you to junk the saw. You have great skills donyboy but I think you don't get the money you deserve.

@vistadrummer09 7 лет назад

Probably where the money is at is for the Professionals. I know a lot that will buy several of the same model saw, trimmer, etc to have backups. However they usually buy the higher end models that are most repairable to get the most out of their investment. Those are the guys that will probably pay as you said. The homeowners etc are the ones they will just replace the saw. This kind of situation is where I'm always at being an IT contractor. I never deal with residential stuff only business and enterprise accounts.

@wade727nelson 6 лет назад

I was a small engine tech. We were SO GOOD at repairing this stuff common repairs took under 30 minutes, clock time. I could diagnose a 4-stroke no-start in under 3 minutes, do a full tune up, blade sharpen, oil change, deck clean...under an hour. Doing 8 of those in a day at $100 per made money. I used every speed-up known to man. Oil suction pump so I didn't have to pull the drain plug. Three electric screwdrivers with every size bit used on a Briggs/Techumseh so I just grabbed the one I needed to remove the cover, etc. A pressure washer that would remove paint to take dried grass off the bottom of the deck, and an angle grinder to sharpen the blade ON the machine in many cases. Impact tools to remove the big nut. Tried to buy the business but the land was worth $1.5M and the shop's income simply wouldn't cover a note like that. Yes, we lost our ass on more complex problems but did them as a challenge. I recall a carburetor with an internal casting flaw that threw us for a loop! Nothing short of x-rays would have made that one any easier to diagnose. I left all the 2-strokes to an older guy who was already deaf, since repairing $100 string trimmers made no sense to me at all. BTW, a "Honda" mower is no btter than a Briggs or Tecumseh, just harder and more expensive to work on. Their tracked snowblowers use thin sheet metal, work well, but can't ingest gravel wthout damage.

@dagrote1 5 лет назад

@@wade727nelson I had more than my share of this, Wade : "I recall a carburetor with an internal casting flaw that threw us for a loop!" I'm seeing more and more of that, now that new carbs can be had for under $20 from China. About 50% of them have flaws that can't be predicted or fixed on the bench. It's a killer because, as you said, you can end up putting in hours and hours into a $150 weed eater and end up with only $60 for your trouble -- if it can be repaired at all. Even then, pressure problems, like the one Donny diagnosed in this video, can mimic the symptoms of a fuel delivery issue. I've learned the hard way, to my great consternation and grief, that you really shouldn't begin work on a 2-cycle engine unless you've done a spark, compression AND a leak down test. Since getting a small engine ready for a leak down test can take 30 minutes on some machines --unless you're superman -- you already have 45 minutes time on task just to do the diagnostics. Bottom line, it has to be a really high dollar 2-cycle machine to justify the cost of any repair.

@dagrote1 5 лет назад

@@vistadrummer09 Correct. We might also add that there is nothing more environmentally damaging than a cheap 2-cycle machine. Since a repair is hardly ever financially justified, they just end up getting tossed into the landfill, and there goes all the labor and materials for its construction and delivery. If you're clever enough, have the patience and the space, you can start a collection of dead, cheap 2-cycles and tear off parts when you need them to keep costs down, but there's no way a professional shop can make good on shop time, which generally has to be upwards of $75 an hour just to keep the lights on.

@Mr_Tecumseh 5 лет назад

Over the last 10 years, the majority of small 2 cycle equipment has been produced as throw away products. Unless its a Stihl or echo or a few other commercial grade brands, they arent worth fixing. Its all junk made by the same corporation out of hong kong. Thats why you see most small engine mechanics wont waste their time on the newer off brand crap because its not worth it. Now if its a stihl that costs 5-6 hundred it's still worth it to have it repaired or repair it yourself, especially a lot of the older stuff. Theirs still plenty of money to be made on the larger 4 cycle equipment and the commercial stuff and being in this industry, you come across a lot of stuff for next to nothing or nothing and fix it up for a nice profit. Its not just repairs, its sales, service and many folks branch out and make how to videos and all that foot traffic brings in revenue too. Us small engine mechanics don't get discouraged that easy. Theirs plenty of work and good money in this industry. I'm sure Don is doing just fine and its also satisfying to take something that isn't working apart, fix it put it back together and see it run again. It takes a special breed of people to do that. We need people like that.

@alejandrovier2958 Год назад

This pump can be used in carburetors?

@donyboy73 Год назад

Yes

@phillipkramer6638 7 лет назад

Can I use that attacher with the carb on and test the carb at the same time as long as I keep the pressure lower. Thanks for you videos which so far are the best ive seen quality.

@Ducktruckful 6 лет назад

Don I was wandering after you run this test,if you can do a upper cyl leak down test with piston up to see if rings are bad, like on a 4 stroke.... thanks again great job

@tlough1 11 месяцев назад

Your video is much better than the guy who spent 5 min stroking his ego before talking like a nervous drug addict.

@geojor 8 лет назад

good one, dony...

@pyrog.c.c89 4 года назад

How do you take out the seal.

@stoolie10 8 лет назад

you need the stihl seal tool for the flywheel side. to easy to damage the crank,etc... just saying.

@BrucesShop 7 лет назад

I just referred a sub to you regarding crank seals. (to watch this video).

@donyboy73 7 лет назад

thanks bruce

@GHULAMABBAS-bs4hy 3 года назад

Very good service Knowledge

@b.c.goldprospecting1724 7 лет назад

you forgot to mention the piston should be at bottom dead center

@jayhiz3514 6 лет назад

Thanks agin great video.

@nickdonato4488 8 лет назад

My small engine has a problem I start it and then after like a couple seconds it dies can u make a video on how to fix it

@gclaper1234 7 лет назад

Hi I have a question can this be done through to spark plug hole. Thanks Glenn

@mooregoodink6971 Год назад

What would cause a small two-stroke engine to generate crankcase vacuum yet virtually no pressure? Am I doing something wrong? The chainsaw is a Craftsman and probably forty years old (similar to a Poulan micro saw, I believe) and with all the apertures plugged, as you advise, (sheet metal plates with cork gaskets as interfaces) my MV 8500 Mityvac displays about 2psi on the gauge (indicating a massive air leak) but no bubbles. When switched to vacuum, the test equipment quickly generates 7 in Hg. The reason I'm investigating is because the machine runs erratically when warm and has a vibration in its handle, indicating crankcase bearings and seals could be worn and leaking. Thank you for your excellent series of videos.

@lewishodge4935 3 года назад

Great video; would like to see how you replaced seal without disassembling engine.

@happyrecluse2849 2 года назад

Lewis,did you see the hole he drilled in the old seal?

@leehotspur9679 3 года назад

Well presented Donny Thanks for sharing Cheers from NZ

@donyboy73 3 года назад

Glad you enjoyed it

@geneballay9590 8 лет назад

Very nice video

@donyboy73 8 лет назад

+Gene Ballay thanks

@colin8532 8 лет назад

Excellent video, I didn't know any of this. Thank you very much :)

@patrickrusca5950 8 лет назад

hey Colin. how's life?! hope u are well.

@jjparody8257 8 лет назад

During a test, I always seem to get a little air escaping from the spark plug hole even though I tighten the plug down snug. I just don't think that the metal washer on a plug creates an air tight seal. Have you experienced this, Don?

@victorboucher675 Год назад

Grease.

@semco72057 8 лет назад

That is nice to know and I didn't know about that going wrong on the saws.

@alfonzo907 5 лет назад

I did not realize that vacuum or pressure had anything to do with an engine's ability to perform right . Good show old chap !!!!!!!!!!!!!! ----Ernest E. Johnson

@lfts2010 2 года назад

Dude! Fantastic informative video! Thank you

@Fireship1 8 лет назад

Great video. I wonder if this would work on a two stroke outboard. I'm guessing it would.

@lauraw3923 7 лет назад

Why do the oil seals go bad? Could it be linked to overheating, lean running or dirt ingestion?

@donyboy73 7 лет назад

wear and tear and if a bearing is worn it also causes the seal to wear as well thus causing an air leak

@RG-wy1ol 2 года назад

Thanks man for making this video very helpful 👍🏽

@jorgeortega1709 6 лет назад

Another great video! Can you show us how to replace the crankshaft and/or flywheel seals on a chainsaw in the near future?

@jorgeortega1709 6 лет назад

Sorry meant clutch not crankshaft

@stanwilson7566 8 лет назад

Could you show how to replacing the seal?

@willywgb 6 лет назад

How to Replace a Seal. Using a set of calipers, measure the deepth of the old seal. Carefully drill a small hole in the side of the seal centered between the ID and OD. Install a self tapping screw into this hole. Be very careful not to drill or install the screw to deep or you will damage the crankshaft bearing. Using either a slide hammer or channel locks, grab the head of the screw and pull the seal out. Be very careful not to damage the running surface of the crankshaft or the seal bore. Clean everything up and install the new seal with the appropriate seal driver or a deep socket. Make sure to install the new seal to the same deepth as the old one. A little oil on the crankshaft surface and a light smear of silicon in the seal bore. Make sure to preform a second pressure/vacuum test. It's a good idea to give the crankshaft a turn when pressure testing older seals.

@fourbyfourer 2 года назад

Thanks for this well explained very informative video.

@hiphopman72 3 года назад

Solid video thanks

@hotbikerguy1988 4 года назад

If I had an air leak like that one would it run my saw too lean to make it overheat? I’ve gone through 2 top ends now on my Stihl ms 440 and I don’t know why!!!!!! I haven’t checked the crankshaft seals yet

@donyboy73 4 года назад

yes it would, on the 440 check the intake boot, it might be cracked

@VIheavyequipment 8 лет назад

hi there iv beening working on a husky 266 i can not get it to start iv replaced fuel line and filter and it has spark was running a year ago what should i do? wont fire at all even with a little fuel put in carb

@newyota1 7 лет назад

Should the piston be at bottom or top dead center

@willywgb 6 лет назад

It doesn't matter the position of the piston.

@RussellBooth1977 7 лет назад

I'm going to have to do something like that to my Briggs & Stratton 3.5 HP engine this weekend. I lapped the valves in today & I still get a misfire at idle speed,I noticed that the top of the engine is dirty so I want to check if the top crankshaft oil seal is sucking in air & blowing out crankcase vapours. The valves did need a lap job because the exhaust valve was just carboned up so it was all black whereas the inlet valves face was eccentric. I want to plug up the PCV tube & blow air into the oil filler hole through a piece of rubber hose to pressurise the crankcase then to use soapy water to see if there are any bubbles present,which would indicate that it has an air leak.

@RG-wy1ol 2 года назад

Thanks for making this video did you make your own parts to to the pressure test?

@zzzdogutube 8 лет назад

When you draw a vacuum it is in (Inches of HG) not PSI. You misspoke. Also, what are the symptoms of a leak? Thanks.

@CarstenLorenzen12V 8 лет назад

+zzzdogutube The symptoms would be a lean running engine, as it would draw more air to the gas/air mixture, past the carburettor. This could result in "bogging" when you open the throttle, fast idle rpm, overheating engine and worst case scenario - seized piston.

@zzzdogutube 8 лет назад

Thanks, that what I thought.

@pbrstreetgng79 8 лет назад

+zzzdogutube In addition to Carstens comment, a saw that won't idle properly, no matter HOW much you adjust the carb is another symptom. Sometimes it will rev up without even touching the throttle.

@zzzdogutube 8 лет назад

pbrstreetgng79 Thanks

@mikecarey4354 6 лет назад

zzzdogutube cool

@ice25781 8 лет назад

tHANKS Dony. One more inlightful vid. Great work. Have a nice day.

@donyboy73 8 лет назад

+ice25781 thanks

@garyhoward3123 Год назад

Will the mighty vac work as well as the walbro pressure tester you show in another video, for carbs?

@hollissmith5467 7 лет назад

where can i find crank seals for a 28 boss

@mikebones322 8 лет назад

Is that just one of those brake fluid pumps???

@madlybackwards5611 4 года назад

So might this seal cause the saw to leak oil from the bottom. Or would there be a seal for the chain oiler?? Thanks awesome helpful vids i cant afford to keep throwing away tools!

@abigailgabriel2348 8 лет назад

Hey Donny I don't know how to ask you a question but I'll ask here trying to get a respond. I just started my generator last snow storm and it was very loud and sparks were coming out of the exhaust. It's about a 10 year old generator maybe older. Need some advice

@eddiewilson4291 8 лет назад

+abigail gabriel I recently watched one of Donny's videos that showed the same thing on an engine. The exhaust valve was stuck, or out of adjustment. Look for this video and I think it will help.

@MrSparkums 7 лет назад

I have an 038 magnum Ii. I did the same but blocked from behind the carb covering the impulse line. Holds 6psi for over 5 min at bdc, both vac and press, but compression test from the spark plug leaks out, wont hold compression when cranking. what am I doing wrong? Great vids thanks!

@MrSparkums 7 лет назад

No scoring on the cylinder, and it does run. Im thinking its piston rings.. meh!

@toddc4d 5 лет назад

@@MrSparkums did you ever figure out what was causing low compression, I have no scoring and changed rings and still low compression, thanks todd

@MrSparkums 5 лет назад

@@toddc4d MI It wound up being the rings.. I would invest in a mighty vac, and make some block off plates. No way to eliminate Gasket or seal leaks without a p/v test.. I wound up selling it for a pretty penny.. Instant regret...

@FixAllFixer62 8 лет назад

i was just going say that

@scottfirman 6 лет назад

On snowmobile engines,there is a rubber plug kit you have to get that plugs all the openings. I used to use starting fluid if the engine still ran,any increase in rpms indicated leaking seals. That doeant work on triple cylinder snowmobiles and twins with a joined head or lower end seal between cylinders. Then you had to plug all the ports and pressure test that way. I remember earlier Polaris triples had issues with the seals between the crank on the lower end. The middle seals always failed. Skidoo also had issues with the 583's. I dont miss those days. I hated triple cylinders. The best thing they ever did was stop making them. A twin cylinder engine with larger pistons produced the same hp. Oh well. Am I dating myself?

@douglas747wct 2 года назад

Hi, great video. I have a MS361 and the same adaptor you used for the leak down test. What did you fabricate to use it with the handle/gas tank assy removed? It makes the procedure a lot simpler! Thanks

@lewishodge4935 3 года назад

Dony: I'm waiting on my order of a MityVac vac/pressure gauge to test my saws. I'm wondering if this would make things easier? I propose using a rubber stopper in the intake boot. It might have to be held in place under pressure, but may work very well under vacuum. Then perform test through the impulse line. What do you think?

@lightshine6044 4 года назад

If a person install oil seal incorrectly on PTO side of MS660, say spring fell off inside seal, will vacuum test spot that seal? Thanks

@donyboy73 4 года назад

yes it will

@lightshine6044 4 года назад

@@donyboy73 Thanks a million. What I meant was that seal looks fine from outside appearance but spring fell off inside seal.

@almo19 3 года назад

Amazing video, thank you Dony! Your videos are sooo helpful! I have a Stihl BG55 blower that I want to leak down test. Do you know how I could do that without a bellows? Is there some kind of adapter I can use to add pressure or vacuum through the spark plug hole. Thank you!!!!