Lapping valves on a Vertical Drive Briggs and Stratton

wsmm · Oct 31, 2018

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.
Thanks,
Bill

T.R.K. · Oct 31, 2018

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.

Lapping valves on a Vertical Drive Briggs and Stratton

wsmm

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T.R.K.

Well-known Member

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