OutdoorKing Repair Forum Forums Repairs and Maintenance Questions on Engines Questions On Briggs & Stratton Engines valve sealment

Hi all,
I have striped down a relatively unused briggs quantrum engine (the one i was trying to calculate the hp on a few weeks back). i have found all the bearings are in great condition, but the exhaust valve and seat was Heavily pitted. the seat has a few pitments and a chip that is about 1 mm by 1 mm at the base of the seat. the valve was totally buggered so I found one of the same length and same size accept it had a domed cut in the top. After fitment it seals enough to hold a small amount kero with minimal seepage.
Anyway what I want to know is it worth lapping it in further even thought it still has a chip or just forget the whole thing (im not prepared to go thought the torment of regrinding or replacing the seat!).
All opinions gratefully taken!
Thanks allot
Regards jay

mowernut,

I was going to suggest you buy a valve seat cutter until I looked up the price. They start from around $800 + and up to about $2000.

If you were not far away I could cut the seat for you as I have a set.

You can't lap out a chip, you'll just ruin the new valve trying. Does the new valve have the same seat angle as the valve seat? I see you are in Melbourne. I live in Melbourne and have a set of Warren & Brown cutters that I inherited ten years ago and have never had occasion to use - I haven't worked on valve seats in more than 30 years. I don't know whether I would have the right seat angle, let alone the right pilot diameter. If you can find out what both of those should be, I'll see if I have them.

G'day,
I have located another identical engine so I shall make one out of the two using various parts. Thanks for you help Bruce and grumpy.
Regards jay

Sounds like a good solution jay - recutting seats that have had sizeable chips out of them results in deep-seated valves, and the valve seat inserts can be weakened as well.