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Briggs 190000 camshaft question


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  #1  
Old 09-20-2019, 05:57:50 PM
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Default Briggs 190000 camshaft question

I am working on a 1992 8 HP I/C Briggs engine/Coleman generator. Model #194412-1112-01. My problem is low compression due to the intake valve being held slightly open until the piston is about a 1/2 inch from TDC. Then it closes and has .007 clearance which is the spec. I don't remember briggs using a compression release on the intake valve on these older engines and according to the parts diagram the cam has no compression release. The cam part# is 691167. I pulled up a couple of e-bay pictures and there is no compression release. Why is the cam holding the valve open?? Possible cam/lifter issue? Thanks for any input.
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Old 09-20-2019, 06:46:35 PM
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Default Re: Briggs 190000 camshaft question

I am just speculating since I am not in front of my 190432 parts engine, but I have a picture which shows a cast ring just to the side of the intake valve lobe, which may act as a compression release. This ring is present in the pictures I see on ebay of the 691167 cam. The tappets in these engines are so basic that I cannot see even a worn or rusty tappet cause this issue. Your engine is probably just fine. Have you tried belting it to an electric motor to spin the engine over fast enough to get an accurate compression reading?

Chris
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Old 09-20-2019, 07:22:49 PM
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Default Re: Briggs 190000 camshaft question

The intake lobe on the camshaft has 2 "bumps". There is the regular lift as normal engines, but there is also a smaller lift as you described. This is on all "easy spin" engines. B & S has been making engines like this for a long time.
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Old 09-21-2019, 11:06:33 AM
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Default Re: Briggs 190000 camshaft question

Good info. Thanks guys! It has been a while since I have worked on an older Briggs engine. (not counting FH's or Y'S!) I always thought the Easy Spin was a mechanical device attached to the exhaust side of the cam. And when the engine came up to speed it pulled in. Two bumps on the lobe makes sense.
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Old 09-21-2019, 01:37:33 PM
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Default Re: Briggs 190000 camshaft question

Briggs ground the decompression release into those cams. To get a good reading you would have to spin the engine backwards
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Old 09-22-2019, 07:59:02 PM
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Default Re: Briggs 190000 camshaft question

Just an update, I reassembled the engine and it starts easy and runs great. Thanks for the fast responses.
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