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Old 04-13-2012, 01:52 AM   post #1 of 10
Packrat
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Default OHV briggs hard to turn over

I got a push mower with a 6.5hp ohv briggs. I was told its hard to turn over. I adjusted the valves to specs, easier to pull but still harder than it should be. If I rotate the engine by the blade, it turns easy, but use the pull rope while its on the compression stroke, and it almost feels like its jammed. Sometimes it will pull over normal, but it's unpredictable. Any ideas? The model # is 121601
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Old 04-13-2012, 08:00 AM   post #2 of 10
daytona54
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Default Re: OHV briggs hard to turn over

did you adjust your valves at top dead center and on compression stroke ?........if so make sure your flywheel to engine shaft 'key' is not sheared,that would be the first thing i would check after valves adjusted.let us know about the key........i will continue to check back on your post to further assist.
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Old 04-13-2012, 09:15 AM   post #3 of 10
38racing
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Default Re: OHV briggs hard to turn over

Quote:
Originally Posted by daytona54 View Post
did you adjust your valves at top dead center and on compression stroke ?........if so make sure your flywheel to engine shaft 'key' is not sheared,that would be the first thing i would check after valves adjusted.let us know about the key........i will continue to check back on your post to further assist.
should be 1/4" past top dead centre
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Old 04-13-2012, 10:30 AM   post #4 of 10
daytona54
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Default Re: OHV briggs hard to turn over

right you are 38racing...........I'd also check to see that the valves are seating properly
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Old 04-13-2012, 10:47 AM   post #5 of 10
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Default Re: OHV briggs hard to turn over

Make sure the blade is the right length, a short or worn blade lacks the inertia to help pass the engine through compression stroke.
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Old 04-13-2012, 10:47 AM   post #6 of 10
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Default Re: OHV briggs hard to turn over

Also be sure the brake is fully releasing on the flywheel, if its dragging intermittently, it will make pulling the rope ****.
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Old 04-13-2012, 11:13 AM   post #7 of 10
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Default Re: OHV briggs hard to turn over

Remove the valve cover (and spark plug wire!) and slowly turn the engine over with the blade. Watch the valves on the compression stroke for operation of the compression release. If you don't see it, it may need a new camshaft, or possibly just the spring on the compression release weight reconnected.

I once had a new Ryan LawnAireIV aerator with a 3.5HP Industrial Plus on it, it could rip the starter grip right out of your hand. All it was was the spring on the camshaft was not connected.
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Old 04-13-2012, 03:23 PM   post #8 of 10
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Default Re: OHV briggs hard to turn over

Quote:
Originally Posted by daytona54 View Post
did you adjust your valves at top dead center and on compression stroke ?........if so make sure your flywheel to engine shaft 'key' is not sheared,that would be the first thing i would check after valves adjusted.let us know about the key........i will continue to check back on your post to further assist.
Yep. I don't think the key is sheared. It will start and run normally, just hard to pull.

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Originally Posted by 38racing View Post
should be 1/4" past top dead centre
Quote:
Originally Posted by daytona54 View Post
right you are 38racing...........I'd also check to see that the valves are seating properly
Valves seem to seat ok. I had the head off to clean off any excess carbon build up. While it was off, I pushed on the valves to make sure they didn't sticking. They move freely and valve seat looks clean.

Quote:
Originally Posted by rscurtis View Post
Remove the valve cover (and spark plug wire!) and slowly turn the engine over with the blade. Watch the valves on the compression stroke for operation of the compression release. If you don't see it, it may need a new camshaft, or possibly just the spring on the compression release weight reconnected.

I once had a new Ryan LawnAireIV aerator with a 3.5HP Industrial Plus on it, it could rip the starter grip right out of your hand. All it was was the spring on the camshaft was not connected.
Yeah looked for that. Didn't see it, but I'm not sure if it has a ACR or not. If it does, its not working. Was the spring damaged?
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Last edited by Packrat; 04-13-2012 at 03:29 PM.
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Old 04-13-2012, 08:10 PM   post #9 of 10
Fairway
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Default Re: OHV briggs hard to turn over

I would venture to guess that he mechanical compression release is busted.
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Old 04-13-2012, 08:38 PM   post #10 of 10
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Default Re: OHV briggs hard to turn over

The spring was not damaged, just not connected when the engine was assembled. Never had a problem with it again.
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