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




What do you think about this video?

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 (SBBDoc): 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 

99trider: Thanks again for your help. I had B&S send me a parts manual and they also list my camshaft a the 790340...I hope this is correct as I have ordered one. I will post my results here once I have the engine back together.

Franklin Jobe: Thanks for your reply. Please confirm the correct part number,  best I can research it is part # 790340.
Model  311-777
Type    0154-E1
Code   000317ZE

99trider: I have a 17hp B&S OHV with the exact cam you show in this video. I adjusted the valves but still could not get the engine to spin over unless I removed the spark plug and yes I tried with a strong, fully charged battery. I have the engine opened up now as I intended to replace the cam thinking the problem is the compression release. Now that I have the cam in my hand I cannot tell if it is the problem, the mechanical release is not broken and it seems to operate as designed. Is there any way to tell if its worn too much to work properly? Do these type releases ever just wear out? I think this engine is about 15years old.
Thanks

Ro Efa: I replaced the head gasket on my engine, and that small cap on the end of one of the valves stems found its way to the crankcase and it broke both the counterbalance link and that centrifugal doo-dad on the cam gear. I have a new link, but Briggs won't sell me the spring and weight assembly... only an entire new camshaft w/gear and weight... too expensive. Do you know of a practical way to add a manual compression release? Some motorcycles have them. PS: Really enjoy your videos; THANKS.

kenny sylvia:
hey I have the 5.5 black model   its a walk behind as well I just had everything apart put together  and working fine  after a few  pulls it locks up do u have any idea that may help me please and have a happy fourth

Nickolas Davies: ah yes finaly, been fixing a tohatsu 4 stroke efi 25hp that suffered a swim, got it runnig all good but could not figure out why it took such a massive amount of force to pull.
then saw this video and all made sense, all 3 were jammed full open so no decompression prior to start.

thanks for the upload.

EASTYJAZ34: My Quantum engine is experiencing Knocking sounds when i shut the engine off. I have made a video about it. What do u think the problem is?

James Humphrey: Also, like fnaguitarplayer9 said, before tearing down, try to reset your exhaust valve setting, if it is sloppy and wide, it may adjust out, if it doesn't then you can look for a  problem on the cam and that is a tear down.

Rating:
How the compression release mechanism works on Briggs and Stratton OHV Engines 5 out of 5

Shared by Others

How the compression release mechanism works on Briggs and Stratton OHV Engines
How the compression release mechanism works on Briggs and Stratton OHV Engines
LAWN TRACTOR REPAIR...... BRIGGS AND STRATTON OHV ENGINE WONT SPIN OVER AFTER VALVE ADJUSTMENT
LAWN TRACTOR REPAIR...... BRIGGS AND STRATTON OHV ENGINE WONT SPIN OVER AFTER VALVE ADJUSTMENT
Tecumseh HM80 Engine - Compression Release Mechanism
Tecumseh HM80 Engine - Compression Release Mechanism
Briggs and Stratton 6.75 HP No OHV compression test
Briggs and Stratton 6.75 HP No OHV compression test
Briggs and Stratton Intek OHV Tear Down/Failure Analysis
Briggs and Stratton Intek OHV Tear Down/Failure Analysis
How to adjust valves on a ohv briggs and stratton engine
How to adjust valves on a ohv briggs and stratton engine
How to set valve lash on a Briggs and Stratton OHV engine
How to set valve lash on a Briggs and Stratton OHV engine
Briggs and Stratton Intek OHV 18HP rebuild (part 1)
Briggs and Stratton Intek OHV 18HP rebuild (part 1)
How to Adjust Valves on OHV Small Engines (Valve Clearance / lash)
How to Adjust Valves on OHV Small Engines (Valve Clearance / lash)
Briggs and Stratton 14.5 HP OHV Reassembly. Then i stripped the crankshaft threads (Old Update)
Briggs and Stratton 14.5 HP OHV Reassembly. Then i stripped the crankshaft threads (Old Update)
Valve Adjustment Briggs & Stratton Intek OHV (Craftsman Riding Lawnmower / Lawn Tractor)
Valve Adjustment Briggs & Stratton Intek OHV (Craftsman Riding Lawnmower / Lawn Tractor)
How to adjust valves on an OHV Briggs
How to adjust valves on an OHV Briggs
( HOW TO ADJUST VALVES) FIX HARD TO START Lawn Tractor with OHV Briggs Engine- MUST SEE- Part 2/2
( HOW TO ADJUST VALVES) FIX HARD TO START Lawn Tractor with OHV Briggs Engine- MUST SEE- Part 2/2
LAWN TRACTOR REPAIR: PART 1 Briggs and Stratton 31q777-0215e1 no compression/overheating issues
LAWN TRACTOR REPAIR: PART 1 Briggs and Stratton 31q777-0215e1 no compression/overheating issues
Teardown and Inspection of Briggs and Stratton 12.5 HP I/C Flathead Engine
Teardown and Inspection of Briggs and Stratton 12.5 HP I/C Flathead Engine
Starting Problems 14.5hp OHV Briggs & Stratton - Help!
Starting Problems 14.5hp OHV Briggs & Stratton - Help!
Briggs Intek V-Twin OHV Valve Adjustment
Briggs Intek V-Twin OHV Valve Adjustment
BRIGGS AND STRATTON ENGINE TEAR DOWN FROM MY
BRIGGS AND STRATTON ENGINE TEAR DOWN FROM MY "HOW TO REPLACE AN ENGINE VIDEO"
HOW TO REPAIR Riveted Pull Start on Briggs & Stratton Snowblower Engine PART 1/2
HOW TO REPAIR Riveted Pull Start on Briggs & Stratton Snowblower Engine PART 1/2
Lawn Mower Compression Test
Lawn Mower Compression Test
LAWN TRACTOR REPAIR: PART 2 Briggs and Stratton 31q777-0215e1 no compression/overheating issues
LAWN TRACTOR REPAIR: PART 2 Briggs and Stratton 31q777-0215e1 no compression/overheating issues

Featured Video