Monday, December 29, 2014

Briggs 31P777-0237-G5

Bought a naked 31ci inch single cylinder BS engine today. 31P777-0237-G5.  I am seeing a lot of different HP figures for this engine so we will call it north of 15 and south of 20.   18 or 18.5 seems to be the the most common numbers.   Rumor has it that it has a cast iron bore.  18.5 is correct.





It is missing the starter and there is dirt in the filler tube which is missing the dip stick.  Need to figure out how to rinse the engine out.  I am not too worried with the pressure lube system. 

To the left is an image of a similar engine on ebay.








I should part it out but am tempted to get it running if possible.  One never knows why a 'found' engine is take out of service.

Starters from the old L-Head engines look like they might work.



The good news is that she is an oil burner and it has a cast iron sleeve!  It is too cold to inspect the bore.  The head gasket looked good.


Learned on the web that one can file the ends of of .010 rings and use them as .003 rings.  If it is out of round or tapered I will bore it out to .010 over and either get a rebuild kit or sell the block and bits on ebay.


Piston with rings is B&S 796173.  $87.52 with shipping from tewarehouse.

Service manual (missing images should be good one in repair books.
276781 Single Cylinder OHV .pdf