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Briggs And Stratton Piston Ring End Gap On The Rings On A Briggs Model 130292

Hi all, i recently purchased an old Toro push mower. It has a vertical pull 3hp Briggs and Stratton which was made in 1973.. i have pulled the engine completely apart to inspect it. I measured the piston ring gap and round the compression rings to have a 0.21 gap and the oil scrapper ring to have a gap of 0.35+ i found this to be quite excessive wear. The bore is pretty good. Just light marks and appears to be quite round still. I was wondering if anyone had the specs for these old 3hp engines? Can”t find the ring gap specs on the internet and my small engine repair manual leaves the piston ring gap spec blank I haven”t yet honed the bore. But I have just read that I shouldn”t hone a Briggs and Stratton aluminium bore? Does this engine have an aluminium bore? I assume it does, if so should I hone it or not? Cheers, Dan

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If you go to the B&S web page, you might get them to email you an original owners manual for the engine, sometimes it will included this information (its kinda hit and miss which manuals have it). If you post the Model, Type, and Code numbers for the engine here on the Stak someone will have it and can help out (my manuals are not with me at the moment or I”d look it up for you).

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Did you possibly mean gaps of .021″ and .035″?Your figures of .21 & .35 are 3/16″+ and 5/16″+ if correct. A gap that large would lead me to believe the rings are broken and the ends are missing…021 & .035 are not overly excessive numbers.If the bore diameter is within spec, not out of round and does not appear glazed, I would not hone. If it has a linear mark caused by maybe the end of a broken ring, then I would hone just enough to remove any high spots, but not try to take the entire scratch out.
M
mo3miniRegistered
John Newman said:
Did you possibly mean gaps of .021″ and .035″?Your figures of .21 & .35 are 3/16″+ and 5/16″+ if correct. A gap that large would lead me to believe the rings are broken and the ends are missing…021 & .035 are not overly excessive numbers.If the bore diameter is within spec, not out of round and does not appear glazed, I would not hone. If it has a linear mark caused by maybe the end of a broken ring, then I would hone just enough to remove any high spots, but not try to take the entire scratch out.
Sorry my mistake. The ring gaps in the bore are 0.21″ for the compressing rings and 0.35″ for the original oil ring. I have just measured the new rings in the bore. Top compression has a gap of .007″ second compression ring has a gap of .015″ and the oil ring has a gap of .015″ Just wondering what the specs are so I can see if the ring gaps need to be larger or if I can just go a head and install them as is. With the new rings in place I can no light between the ring and the bore, indicating to me that the bore is still round. Not sure if there is actually a way of testing it, i have no tool for measuring the inside of the bore. Just the top of the bore which is standard sized. There are no real marks in the bore. Perhaps a very light hone would be ok? 2 odd passes with a well oil 3 stone hone :shrug: Im not really sure what the signs of a glazed bore are, ive always honed the bore lightly when installing new rings. But this is the first ally block briggs I have put new rings in. Cheers, Dan———- Post added at 12:00 PM ———- Previous post was at 11:56 AM ———-bugger. I mean .021″ and .035″
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RSCurtisRegistered
If the bore looks OK, use a set of Briggs chrome rings. They will tolerate some cylinder wear. Do not hone an aluminum cylinder. PN should be 297201 for a 3HP, or 299742 for a 3.5HP. The second digit of the model # will tell what type of cylinder it has- “0” is aluminum, “1” is cast iron.

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RSCurtis said:
If the bore looks OK, use a set of Briggs chrome rings. They will tolerate some cylinder wear. Do not hone an aluminum cylinder. PN should be 297201 for a 3HP, or 299742 for a 3.5HP. The second digit of the model # will tell what type of cylinder it has- “0” is aluminum, “1” is cast iron.
Hi, not sure which rings I have. They have a shiny surface which contacts the bore.. im guessing there chrome. But they are the only 3hp rings I could find in the UK. Model no. 92508 Type 0904-01 Code 7309180 Dan
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Arlie LevySponsor
The rule of thumb I have worked with and that is for all engines is .03 thousants per each inch of piston diameter.

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Arlie Levy said:
The rule of thumb I have worked with and that is for all engines is .03 thousants per each inch of piston diameter.
oki doki. So I should be ok with .006″ on the top ring, .015″ on the second .015 on the oil ring? Dan
your engine is most likely a 92xxx series, aluminum “kool bore” ring gaps, compression rings reject size-.035, oil ring-.045, sleeve bore engines comp. rings reject size-.030, oil ring-.035, the .003 per inch of bore size is a good rule with two stroke engines, hope this helps
M
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old 6bhs said:
your engine is most likely a 92xxx series, aluminum “kool bore” ring gaps, compression rings reject size-.035, oil ring-.045, sleeve bore engines comp. rings reject size-.030, oil ring-.035, the .003 per inch of bore size is a good rule with two stroke engines, hope this helps
Thanks for the information. I guess my old rings were just in limits, i can use the old rings in the hayterette as i know the rings in that are bad.. does the .003″ rule work for four stroke engines as well? Dan
O
old 6bhsRegistered
mo3mini said:
Thanks for the information. I guess my old rings were just in limits, i can use the old rings in the hayterette as i know the rings in that are bad.. does the .003″ rule work for four stroke engines as well? Dan

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