Valve Seats and Lapping


Old 08-17-04, 08:02 PM
Visiting Guest
Posts: n/a
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?

Sponsored Links
Old 08-17-04, 11:58 PM
cheese's Avatar
Forum Topic Moderator
Join Date: Jul 2001
Location: USA
Posts: 16,821
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).
Old 08-19-04, 04:23 PM
Visiting Guest
Posts: n/a
Thanks for info. I don't think I am ready to attempt a rebuild yet.

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Thread Tools
Search this Thread
Display Modes