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Valve Seats and Lapping

kelliew41's Avatar
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08-17-04, 08:02 PM   #1  
Valve Seats and Lapping

I am working on a B&S 5 HP aluminum cylinder engine. There was no compression at all when I pulled on the starter. (No resisitance on pull)
I came to the conclusion after pulling the cylinder head plate that the valves needed to be replaced because they were worn and badly burnt. I got the old valves out and fit the new ones into place. After cleaning the seats real good, I found that there is a small chunk out of the intake seat. This may be a source of leaks. I am not sure how to fix it.

I don't know how to remove the seat or peen it back into place.
Is this a hard process without any specialized tools?

Can valve lapping be done instead of seat replacement?
What is the best lapping product and procedure?


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08-17-04, 11:58 PM   #2  
Hello Kellie!

An automotive machine shop would be the best bet for this kind of work. I hate to say, but if the engine was worn badly enough to have worn out valves, it is probably worn out everywhere (cylinder, rod, piston, rings, possibly crankshaft journals).

"Who is John Galt?" - Ayn Rand (Atlas Shrugged)

God bless!

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08-19-04, 04:23 PM   #3  
Thanks for info. I don't think I am ready to attempt a rebuild yet.

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