Push mower oil leak Briggs

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Rivets

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• Jan 7, 2019 / Push mower oil leak Briggs

• #51

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

 

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• Jan 7, 2019 / Push mower oil leak Briggs

• #52

Thanks! ^^^^

 

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bertsmobile1

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• Jan 7, 2019 / Push mower oil leak Briggs

• #53

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

 

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rwomack

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• Jan 8, 2019 / Push mower oil leak Briggs

• #54

Pics of bore

 

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• Jan 8, 2019 / Push mower oil leak Briggs

• #55

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

Did you happen to measure compression ring end gaps?

 

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Rivets

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• Jan 8, 2019 / Push mower oil leak Briggs

• #56

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.

 

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rwomack

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• Jan 8, 2019 / Push mower oil leak Briggs

• #57

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.

 

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rwomack

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• Jan 9, 2019 / Push mower oil leak Briggs

• #58

Ring gap is 1.219mm
Ring groove .152mm

 

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• Jan 9, 2019 / Push mower oil leak Briggs

• #59

rwomack said:

Ring gap is 1.219mm
Ring groove .152mm

Click to expand...

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

I'd say a bit worn....

What's spec's call for?

 

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rwomack

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• Jan 9, 2019 / Push mower oil leak Briggs

• #60

SRTsFZ6 said:

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

I'd say a bit worn....

What's spec's call for?

Click to expand...

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