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Lapping valves on a Vertical Drive Briggs and Stratton

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Author  [Modern View]

10-31-2018 16:05:50

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Many instructions show an engine's show the valves in a vertical position when they are being lapped. With my vertical drive engine in my lawn tractor the engines are in a horizontal position. I will be using a Craftsman reciprocating valve grinder. Can I lap the valves in the horizontal position, so that I don't have to pull the engine.

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10-31-2018 18:34:37

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 Re: Lapping valves on a Vertical Drive Briggs and Stratton in reply to wsmm, 10-31-2018 16:05:50  
I've done it on a lot of Briggs vertical flat head engines with no problems. Just be sure to clean all the grit out. But you knew that already.

If you use a reciprocating valve grinder, you know to put the spring with the grinder on the valve, don't you? And don't use too much pressure. And take your time.

The reason I ask if you know about the spring is most of those grinders you find at flea-markets have lost all their accessories at some point. And for some reason, you don't find the spring available in most mower parts catalogs. I keep a spring that came out of a automobile wheel cylinder with the one I use at work and it does fine. The spring lets the valve lift a bit without the valve slipping on the grinder while you turn the crank.

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