Small Engine Repair: Adjusting Valves or Valve Lash on a Tecumseh Lawn Mower

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*Always follow the instructions in your repair manual when doing repair or maintenance work on Outdoor Power Equipment. Manuals can be found at the manufacturers website.*
This video shows how to adjust the valve lash on a Tecumseh engine. Manuals for all Tecumseh engines can be found online and for free. The method used to adjust the valves in this video is similar to the method used on other industrial engines that require valve adjustment and have rocker arms.
Tools Used:
- Feeler Gauge
- T20, T30 Torx Wrench
- 7/16" Crowfoot Wrench
- 3/16" Allen Wrench
- Torque Wrench
Specification:
- Tecumseh Engine Model OVMR120
- Valve Lash for both Intake and Exhaust Valve is .004"
- Torque Spec for Lock Nut on the Valve Lash Adjustment Bolt is 120 in. lbs
- Torque Spec for Rocker Cover Bolts is 40 in. lbs

Опубликовано:

7 сен 2024

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Комментарии : 61

@CharlieWolz1 12 лет назад

Glad to help out someone who cares about doing a good job.

@6Sagebrush9 10 лет назад

Great job on your video. I just finished watching a dozen or more other engine repair videos which were pretty rough. By every comparison, yours is a great example of how a video should be done. It was thought out, set up with good sound and light, and the information was presented in a concise and effective way. Thanks!

@smallengineshop 10 лет назад

Thanks! And thanks for watching!

@anniversary4 8 лет назад

I agree. He's in the same league of few with Donyboy73.

@hobokengar 12 лет назад

I absolutely love the way you present this material. Damn good job, dude...damn good job.

@Mr_Tecumseh 8 лет назад

That is the first small Tecumseh OHV lawnmower engine I have ever seen for a walk behind mower. They must be pretty rare. I guess they only made those engine's a very brief time before they went under. Ive never seen one in person and I have dealt wit hundreds of mower's.

@smallengineshop 8 лет назад

Ya, you usually think of a flat head when you think Tecumseh.

@WARFOX101 12 лет назад

What luck! I just bought this same mower with the same engine at the flee market. i was hoping to find a vid on how to do this very thing. Thanks for the vid.

@tonym6920 10 лет назад

Great video. I don't own this particular mower but I did find the information extremely helpful and well organized. Thanks. I've subscribed to your channel.

@GruvenHaus 10 лет назад

GREAT NARRATION ON A GREAT PRESENTATION..

@mjmpiano 13 лет назад

What are the chances of finding the exact mower/engine and issue I needed to fix on RU-vid, outstanding!

@scottbabb2321 7 лет назад

Really really great video, man! Thank you for posting. I've got a different style engine but that was exactly what I needed to know and it worked!

@macknumber9 5 лет назад

Sounds like this guy just got home from a funeral and decided to make a video.

@rocket1054 4 года назад

well done, very helpful. Thanks for the video

@CharlieWolz1 12 лет назад

The crows foot should be used at a 90 degree angle to the torque . That gives you the indicated torque. Straight out in front will increase the torque over the indicated value. So always at 90 degrees to the wrench. How do I now? I was a tech at a Harley dealership for 10 years. Things you need to know.

@anniversary4 8 лет назад

good video. Great video quality and focus on the subject at hand!! B& S tells you to go 1/4 inch past TDC to adjust valve lash. I'm told this is to get past compression release bump on camshaft. Is that not the case with Tecumseh?

@MRSketch09 12 лет назад

@smallengineshop Alright. Thanks very much!

@MRSketch09 12 лет назад

@smallengineshop Thanks for the answer. Now another question, wherd'd you get the confidence to feel like you could do it? Serious question.

@fred306801 12 лет назад

I started out with a 5 hp Tecumseh. It needed a carb, rebuilt. But it was bad. So I got a new one. After a few pulls I lost all compression. Checked the valves and they were so lose they would not sit on the rod and springs. Watched your video and did as you said to do. Why would someone take the kill switch and ground it to the frame ? The coil is bad. Oddly the guy who owns this says No one has ever worked on this engine.

@warriordriver350 12 лет назад

You usually front have to replace them gaskets in fact you almost don't need them because the oil is not compressed. Head gaskets are a different story.

@davidkemp1883 8 лет назад

Awesome video, 1 question. my feeler gauge as managed to excape me..! is there something I can use in mean Time that equals within +- .002" of the .004" I need to achieve.? thanks..

@jeremytannehill9427 4 года назад

Im also wondering this!

@MsFarmer567 11 месяцев назад

What size is the crow foot??

@sasquach18990 13 лет назад

i have the same one mine has a problem its blows oil out of the fill tube every time i try to start it can it be the piston rings seized to the piston?

@Thedge10 11 лет назад

Good Video. Question : My OVRM120 will not hold the lash adjustments, so the a comp release does not work well. Last adj I found the intake locknut valve loose even after torquing to spec (for my t-wrench/crowsfoot I calc 8 % less). I also found the studs stretch while torquing and opens clearance, which I then re-adjust correctly. It is running lead due a carb that needs cleaning/rebuilt. So, maybe the added heat an affecting torque/lash. Loctite on locknuts? Any other ideas?

@GeraldThomasphotojunkie 10 лет назад

Subscribed! Well done sir!

@ohiodigger4391 9 лет назад

Can valves being out of adjustment cause a popping sound through the muffler? It's not a backfire, just a popping sound. It's pretty consistent. I tore the carb apart and cleaned and adjusted. Drained fuel, replaced fuel line. Put in new spark plug. The rider had been sitting for a couple years. It seems to pop with or without an air filter on it (the air filter is old but I've been using it).

@caylonxt225 3 года назад

Did you ever fix this issue? I have a 5hp tecumseh engine doing the same thing.

@ohiodigger4391 3 года назад

@@caylonxt225 no I ended up selling the mower because I found a good deal on a 48” Snapper walk behind mower.

@samuelsmith8576 2 года назад

What are the head bolt specs

@richardrisch 6 лет назад

question, I have a 5hp Tecumseh snow blower engine, got a 124lbs compression with starter, new carb, timing seems correct- but IT WILL NOT EVEN FIRE WITH STARTER FLUID- ANY IDEAS- thanx

@knuckle_dragger 6 лет назад

ricker bear no spark?

@gervaisfillion9417 9 лет назад

those engine,did they have oil seal on their valve???

@sagitario12ish 4 года назад

Hi, how can I know the gauge valves on a lawn mower, is on any stickers on the machine or I need to looking for online, thanks and nice video

@FlyBoyMike1000 12 лет назад

Good video. Can you replace the T-30 bolts with standard ones?

@DaleB809 7 лет назад

what would the cost be for a valve adjustment

@jamesjustice4072 10 лет назад

What causes the push rods to keep bending on a snapper ride mower 14.5 hp .

@smallengineshop 10 лет назад

Resistance. I've seen valve stems gummed up from bad fuel bend push rods.

@Joshua_list 13 лет назад

I have a quick question. I completely took apart my spar lawn mower engine to thoroughly clean it. The problem I have ran into is this, I cannot find a cheap piston ring compressor. My piston has 3 rings and I can't put them in by hand. I bought a cheap one from Harbor freight but it is too big.

@jimbobaby1468 6 лет назад

try zip ties

@dballer51 5 лет назад

I know this was a long time ago, but use a hose clamp. It worked fine for me.

@SuperFishbreeder 5 лет назад

Feeler gauge should be almost snug your was too loose incorrect Setting needs to be tighter

@josephhinojosa5373 10 лет назад

How do you know how many thousandth of an inch your specific engine needs between the rocker arms and valve stems?

@smallengineshop 10 лет назад

Manufacturer repair manual has all the specifications.

@josephhinojosa5373 10 лет назад

what if you don't have the repair manual?

@smallengineshop 10 лет назад

What engine are you working on? What is the manufacturer and model number?

@Mr_Tecumseh 8 лет назад

At this point you can jut go to Tecumseh.com or google it. They have been out of business for 8 years all of those manuals are available to view free now. But you could also just search your engine's specific clearances. You don't need the manual. Your making it harder then it has to be for yourself. Its the information age, just look it up.

@chadwick330 11 лет назад

is this the same for ohh60 engine?

@MRSketch09 12 лет назад

How'd you learn all this?

@Thedge10 11 лет назад

No need to really. They are also 3/8" outside hex, so a standard box/open end wrench or socket will work.

@PanicHereComesDavid 10 лет назад

what would 120 inch pounds be in foot pounds ?

@7777independent7777 10 лет назад

10 ft/lb

@tedwilliams9666 4 года назад

120÷12 10 ft lbs

@therandomman6647 3 года назад

Idk imma stick to flathead, not opening that can of worms Good video, ohv is not my cup of y

@terryfloyd8251 4 года назад

Don't listen to this dude, he's got the intake and exhaust valves backwards, the bottom valve is the exhaust

@RobertoGarcia-lk9lz 9 лет назад

Por ke echa umo azul honda hrc216

@ImSrry4BeingWhite Год назад

4000 sth of an inch gotcha

@ad356 12 лет назад

never really cared for Tecumseh too much, much prefer briggs. some of the older Tecumseh flatheads were fairly good engines, i just dont think they were ever as good as briggs or kohler. i dont like newer Tecumseh carburetors at all. i had a late 90's sears walk behind with a Tecumseh that always ran poorly from day one. i swear it was the newer carb design. i think they went out of business because their products weren't that great