Push mower oil leak Briggs

[Rivets]

A face cut is the grinding or cutting of the valve face, depending on which system you are using. A seat cut is the grinding of the valve seat. Cutting is most often done with a Neway cutting system and grinding is done with a valve grinding (stone) system. The angle of the face is different than the angle of the seat. After they are both done, then lapping is done. In my opinion it makes no sense to lap valves if they are not cut first. Here is a manual that might help you with specs and procedures. https://docs.google.com/open?id=0B6NaqjIxWV1ycG8wd0s3Z2Q2X00

 

[(Account Closed)]

Thanks! ^^^^

 

[bertsmobile1]

A "cut face" is bright & shinny.
lapping the cut face in yields a dull section which is how you tell when to stop lapping.

 

[rwomack]

Pics of bore

 

[(Account Closed)]

Looks as I would expect, could be worse...

Did you happen to measure compression ring end gaps?

 

[Rivets]

The pics of the bore confirm what I was thinking when I saw the pics of the piston. Severe scoring and evidence of piston slap. Before buying any parts or spend more time I would have that cylinder measured for size and out-of-round. I know I am not there and pics don’t always tell a true story, but I am willing to bet that it is no longer within specs. Hopefully I am wrong, but please spend a little to have someone who know how to measure do so. You might be wasting a lot of time and money if you don’t. Just my opinion, read my signature.

 

[rwomack]

Ok. Thank you. The engine was running fine when I took it down. It just had a lot of hours on it. I’ll do some more digging.

 

[rwomack]

Ring gap is 1.219mm
Ring groove .152mm

 

[(Account Closed)]

Ring gap is 1.219mm
Ring groove .152mm

If my math is correct, ring end gap is just over .030" .

I'd say a bit worn....

What's spec's call for?

 

[rwomack]

If my math is correct, ring end gap is just over .030" .

I'd say a bit worn....

What's spec's call for?

That I don’t know. I have not been able to locate the specs.