How The Compression Release Mechanism Works On Briggs And Stratton OHV Engines




What do you think about this video?

Gord Baker: Great to see that method explained. Setting valve lash cold @ 0.005" is key but do it with something in the open cylinder under compression turned past TDC so you can tell when the piston is about 1/4" down past TDC

jason prodger: Great video, just the info I needed. Thanks!

James Rooney: hi how do i install on kohler courage plastic cam ?? where does spring go thank you jim

Scott Smith: which cam lobe has the pressure release? intake or exhaust?

Lewie McNeely: That's cute. All my stuff except for the Kawasnapper has 'L' head engines on them but the KOhler on the Gravely sure has one on it. I think you could turn it over with a flashlight battery. Thanks, Pal!

andreythedon: thanks!! I opened the bottom end of engines several years ago and the mechanics but I forgot. thanks

Janelle Mueller: Mowing thick grass at full power with a 17.5 hp Briggs hit a hidden object, killed the mower. Wouldn't start again. It needed new rings so I broke it down replaced rings. Thought maybe it sheared flywheel key but not the case. re-assembled it runs but barely, and turns the exhaust red hot in just a minute or so. Obviously out of time (retarded) any ideas on what happened??

krrrruptidsoless: What's the normal wear or breakage of one of these.
I just bought a mower with a 27hp b&s and it goes against compression but no further. Read some forum question with the same problem. turns over fine without spark plugs. It's showing over 150 PS for compression also which I thought sounded a little too high.
I'm figuring just adjust the valves, but was wondering what other catastrophic stuff I should look for.
Just bought a new tranny for it and now seeing possible rebuild because of some flimsy compression release lever......? argh.

Thanks for the quick video though at least I have an idea of possibilities.

TheGMlover1: I have a 2011 7.5 Briggs on a power washer and it has no compression what so ever and I took of the valve cover and valve don't move at all when pulling the cord. it's almost brand new hasn't been used hardly at all. could it just not be getting the fuel it needs to run? is this why the there is no compression and valves aren't moving because it's not shining fast enough for it to fling it back in? please help thanks

M Gomez: How does it work on L heads?

M Gomez: I am having trouble starting my mower. There I resistance when I pull cord but mower starts. W/O the spark plug it is smooth as butter. Another u tuber suggested that compression was not releasing during start up. Told me to check for small bump on valve. If I did not have it to replace cam. Mine is ohv 550 series bs engine.

hugh dolan: Thanks I will give it a try when the weather warms a bit. If it works, i'll report. DD

hugh dolan: Thanks for the video, to make it short for you, Do you think it possible id drill and install a hand operated release valve in the head, like the old john deer's? Thanls

Alpatriod: is this a automatic compression release then?

Doc Riordan: I have 2 easy start b&s and both only show 60lbs of compression, would this release stop me from getting a true reading while pulling the rope 5-6 times as normal?

Gary Rice: I see what you mean - but - the valve stem rides on the lobe - and is thin - so how does it touch both surfaces?

99trider: All is well now. I do not know exactly what got the kinks out but the engine is running fine now. At my last posting the engine was surging when under load, tried new fuel pump.. no help, removed the the new in-line fuel filter...no help. Finally removed the carb, poked, probed and cleaned. Never saw anything in the carb that would prevent fuel flow??? Replaced old crankcase vent tube that had a hole in it, but the carb back on and now it runs fine?? I did not  rebuild the carb, did not put any new parts in the carb, no gaskets, no needle, no anything new.
Thanks again for all your help!

99trider: Finally got the new camshaft in, the mower starts and idles fine but surges/lopes when I start mowing. Is it possible I installed the governor wrong

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