Re: Re: Briggs 11 hp won't run

Posted by Hal/WA on April 27, 2004 at 22:19:56 from (148.78.243.26):

In Reply to: Re: Briggs 11 hp won't run posted by pasbon on April 27, 2004 at 13:04:09:

I have also had the gap on the intake valve become too tight or non-existant and the symptoms my engine had were hard starting and spitting back through the carb while the engine was being cranked. When I dug into the engine, I found that the intake valve was not making a good seal on the seat when the valve was at the lowered position.

I removed the intake valve and ground a small amount off the end of the stem. I also hand lapped the valve to the seat with valve grinding compound. Before I put it all back together, I verified that the clearance between the valve stem and lifter was within specifications. The engine then would start and run fairly well and I used it another year.

For awhile before I was forced to do the repair because it just wouldn't start anymore, the engine could be started with ether, and once it was running, ran OK. I suspect that over time the valve and seat wear, causing the valve to be further into the engine block and reducing the clearance between the stem and lifter. I did compression tests as part of my diagnosis and did not get extremely low readings like I would have expected from a burned valve or bad rings. Confusing.....

I suspect that the leaking intake valve caused a totally wrong mixture for the engine to start, with the air leaking back into the carb/intake manifold, and that was why the engine would start for awhile with ether, until the leaking valve got too bad.

Good luck!

Follow Ups:

• Re: Re: Re: Briggs 11 hp won't run Hal/WA 22:48:04 04/28/04 (0)

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