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Automotive Cylinder Leak Down Test

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Automotive Cylinder Leak Down Test
Disclaimer:
This video is not meant to be a definitive how to.Always consult a professional repair manual before starting your repair.I am not responsible for any problems that you might incur by watching or following this video.Follow at your own risk.

Опубликовано:

22 авг 2024

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Комментарии : 70

@Vintageguy73 13 лет назад

Very good video! I've used masking tape on the balancer to determine TDC for different cylinders. Cut a piece of masking tape the same length as the circumference of the balancer. Make three equally spaced marks on the tape, put the tape on the balancer starting at #1 TDC. Now when the marks line up with the timing pointer each piston will be at TDC compression following the firing order.

@RichpinTv 13 лет назад

@spelunkerd when pressure is applied (e.g. 100psi), what we are looking for is leakage in the cylinder as compared to the airflow through a 1mm orifice at that pressure. You could use a shut off valve.

@curtis9188 13 лет назад

the blooper was a nice touch

@texturedmuffin 13 лет назад

Rich Pin, you are a smart person. You have my respect.

@green95gt 13 лет назад

make sure it's at tdc between the compression and power stoke. some valve overlap may exist between exhaust and intake strokes.

@RichpinTv 13 лет назад

@liOVERLOADil I do not think letting the engine cool down to take out the spark plugs will effect the test.

@RichpinTv 13 лет назад

@Vintageguy73 I have done the same think to adjust the valves put four marks on the pulley for each cylinder top dead centers.

@RichpinTv 11 лет назад

I had a 86 jetta that tapped like that a couple of years before i gave it away. Important Update: Jan 2013 there will be a new richpin channel for all future videos.Richpin06a channel will be mainly for all the Saturn lovers out there.Should be a lot of fun so stay tuned.

@spelunkerd 13 лет назад

So, I guess the reason for the pinhole is so that the regulator can't replenish air fast enough to maintain pressure when there is a significant leak. Would an instream shutoff valve accomplish the same thing? Do you think you could eliminate the second regulator and just have a shutoff valve? I find my airhoses tend to leak at those quick connections, which might confuse the readings....

@RichpinTv 11 лет назад

I checked the rotor in the distributor to make sure it was pointing to the cylinder i was working on before i started.It does make you wounder because of all the leak down.

@RichpinTv 13 лет назад

@wangbungal The dip stick tube or pcv hose all lead to the crankcase.

@sethjones5250 8 лет назад

TDC is also done to make sure valves are closed. Of course it is true that if the engine is locked, and the cylinder you are testing is on compression or power, this wont matter as much.

@ModStarCrash 11 лет назад

Hey Rich are you sure you weren't at TDC on the exhaust stroke instead of the compression stroke? That would explain the pressure escaping through the exhaust valve.

@Methodical2 11 лет назад

Nice video that's easy to follow -bookmarked for future reference.

@michaelovitch 13 лет назад

Very instructive and interesting !

@50blitz50 11 лет назад

Hi Rich: I ended up buying one from OTC off of Amazon. I couldn't find the parts to make one for less then the cost of buying one. The pressure regulator was the part I had trouble with the local stores all wanted $30 or $40.

@trayyy00cvrurface 13 лет назад

@darkfyre2k7 from the looks of your tests, if not replace the engine, you would have to send it in for some machine work. the bore of the cylinder is probably just as worn as the rings. A machinest would bore out the cylinders, and you always want to replace the rings on every piston, not only because they come in a set, but because replacing only one piston ring set would cause uneven compression anyways. and your test also indicates you probably need a new head gasket...

@trevormorgan9528 11 лет назад

You should be holding the crank Pulley because it will turn the hole motor over where it will open the Valve

@Mulletsrokkify 13 лет назад

Excellent videos, well explained as usual!

@Okie-Tom 3 года назад

Did you ever do a leak down test on your dads ole Model A truck? Did you ever rebuild that neat ole truck after the wreck? It was neat! Tom

@darkfyre2k7 13 лет назад

@richpin06a well it vibrates a lot when it's cold, but that might just be from imbalanced compression, or so I'm told... would that be a sign that the crank is trash? did the leak down test and it's only rushing through the oil filler... even did a head check and a rad check, no sounds coming from those and no bubbles in the coolant resevoir

@szaki 10 лет назад

Piston has to be under compression stroke, also.

@RichpinTv 13 лет назад

@darkfyre2k7 Hard to say you would have the measure the crank to see what condition it is in.

@MoldyLunchBox87 13 лет назад

Very detailed and informative video!

@50blitz50 11 лет назад

Hi Rich Pin: Thanks for the video. Nice to see an "old school" man building his own tools. I am thinking of building one of these LDT but wanted to have a two gauge system right at the tool because my air supply gauge on my compressor has a lot of hose between it and the connection point. Instead of a plug if I put a second gauge in the regulator would that serve my purpose to have an accurate reading? I think so but am not positive.

@jjbailey01 7 лет назад

Seadawg I'm fairly certain you are right. As long as one gauge is on the upstream side of the epoxy orifice and the other gauge is on the downstream side in order to measure the differential pressure and get the the percentage reading.

@estrelladelnorte1308 10 лет назад

ok! now i found a good video in HOW TO DO A LEAK DOWN TEST! thank you sr!

@RichpinTv 11 лет назад

If the air at the regulator at that plug is unregulated that would work find which i am not sure.I must investigate.

@RichpinTv 13 лет назад

@texturedmuffin thank you

@Gunnanmon 13 лет назад

How can you get a proper test if the engine has been sitting for so long and the piston isn't lubricated? Won't air just come out of everything if not properly lubricated?

@RichpinTv 13 лет назад

@hondaslave Yes it does

@fshrofmn 11 лет назад

Nice job Rich.

@Markinsky 11 лет назад

If the rings are not sealing -would this explain excessive use of oil?

@aolsvi1 6 лет назад

Haha I did not read the comments at first in here, but I did not know that Peter Griffin was a car guy! :D

@darkfyre2k7 13 лет назад

I have a 97 dakota V6 with ring leaks, and the local garage said replace the engine... would just replacing the rings be okay? they only went out 160 miles before testing compression... readings were from cylinder 1-6, 145, 140, 100, 120, 75, 95... the guy said that something like replacing rings would blow the bottom end out because of stress attributed to power returning. is he right?

@Filmaker25 11 лет назад

Will this cause a tapping sound in the cylinder? I have a slow leak around the head gasket and I have a tapping , at least when it's cold in the morning then it goes away.

@RichpinTv 12 лет назад

It could be the head gasket or a crack in those two chambers.

@Markinsky 11 лет назад

I have an engine that's using a lot of oil. 1 quart per 500 miles. It's a Honda Civic-2004. Would this test tell me where I was losing the oil. The engine is a used replacement engine supposedly with only 60,000 miles on it. It's under warranty and I want it replaced because it is using so much oil.

@RichpinTv 11 лет назад

The info i got when i made this tester did not say anything about flow rate.

@RichpinTv 13 лет назад

@wangbungal yes cylinder head

@zambam3 12 лет назад

great video brother! thanks, rob

@carlosdlarios 10 лет назад

Hi peter, say hi to meg

@Filmaker25 11 лет назад

thanks for the reply rich. I changed the oil and it still happens. So I suspect it's the lifter then, yeah. So if it goes away when it's warm, how much time, roughly? before we call up one of those "will remove junk cars " ads? LOL

@SaucyBegger25 12 лет назад

my car has a leak between cylinders 1 and 2. just found out with this test :( is it gasket failure or could it be worse :(

@D3adlyX 12 лет назад

thanks a lot you've helped me a lot!!!

@zxtenn 11 лет назад

Next video is how to remove heads on VW and check heads

@rleon1991 13 лет назад

great video!!

@axenz1 9 лет назад

Hi, can the seafoam remove carbon deposit on leaking valve ? so it will fit again? Thanks

@schigara 8 лет назад

Never tried Seafoam because water is free and works great. Get the engine up to operating temperature and find a vacuum source on the manifold that has a small diameter vacuum line. Get a gallon of water and, with the engine running and at operating temperature, have a friend hold the throttle at 2500-3000rpm and submerge the vacuum line in the water and let the engine ingest the water. The throttle will need to be modulated to maintain the 2500-3000rpms. Let is ingest water for a few seconds and then lift the line out of the water to let the steam stop and the engine recover for a few seconds and then repeat until the water has been used. You will see a lot of white steam come out the exhaust. The water turns to steam in the engine and shock cools the carbon which causes the carbon to break free. Ever seen how clean and carbon free a piston crown, cylinder dome and valves are after and engine has been running for a while with a blown head gasket where coolant has been entering the cylinder? Same principal. Many people will say, "Whooooaa dude, your gonna suck in too much water and hydro lock and break a piston or bend a rod!!". Well, that's why we use a small diameter vacuum line and port to suck the water in with. We don't want to use anything large like the brake booster vacuum port. With a small vacuum port and line, the water is pulled in at such a low volume this is a non issue. This is an old timer mechanics method I learned 20 years ago from a 45 year veteran mechanic. I have used this method to clean carbon from valves, piston crowns and combustion chambers on well over 250 cars and works a dream.

@axenz1 8 лет назад

Hi, thanks for info... :)

@gst69man 13 лет назад

good vid thanks

@RichpinTv 11 лет назад

Central MA (Boston)

@RichpinTv 11 лет назад

It will tell you if your rings are not sealing.

@68ray 12 лет назад

What's a Ka-Burator?

@RichpinTv 11 лет назад

The tapping sounds like it could be coming from your lifters.

@SaucyBegger25 12 лет назад

when i say leak i mean it has no pressure at all n air just comes gushing out the adjacent cylinder

@johnnyyammine77 8 лет назад

Can this be used on a diesel pickup?

@jjbailey01 7 лет назад

Jean Yammine yes. You need an injector bore adapter such as from a diesel compression tester.

@kirbstone111 13 лет назад

Nice vid :) Thanks for sharing.

@testosteroneinc.3800 8 лет назад

I subbed cause this guy sounds like Peter Griffin.

@DingDangg 11 лет назад

Are you from Boston?

@RichpinTv 11 лет назад

50 miles west.I guess we have the same accent.

@Gunnanmon 13 лет назад

@richpin06a Please re-read my comment.

@serchmarc 12 лет назад

iv just subbed!!!

@markvietti 6 лет назад

thats probable stock for a jokes wagon

@wcjcnc 3 года назад

You’re doing the test wrong. Here’s how it should be done. First. You need over 100 PSI coming from the compressor. Second. Since you’re using the main line reg and gauge you don’t need a reg on the tester. Third. You should have the tester connected to the cylinder from the start. OK, once all that is done You adjust the main reg in your system to 100 PSI. Then you subtract whatever the reg on your tester says from the man line reg to get your percentage of leak down.