Skip to main content
Collection, Preservation and Display of Old Lawn Mowers

Suffolk 75G14 piston rings: non-original

Enter a word or two to search the forum section and click the Search Forum button.

Hi

I've just bought a piston ring set for my 75G14 engine off eBay. They are obviously pattern parts made in somewhere like the Far East, as the quality isn't great and they are different to the genuine original rings.

As you probably know the two original compression rings differ in that the top ring has a step on the upper inner face, and the second one has a step on the lower outer face.

However both compression rings in my new set are identical, having one 45 deg. bevel on the inner face only.

Does anyone know which way round these should be fitted, as there were no instructions provided and the seller didn't have a clue what I was talking about? For now I've tried to follow the original method slightly, by fitting the top ring with the inner bevel at the top, and the second ring with the inner bevel at the bottom. The engine runs fine like this but I don't know if it would be better in a different configuration?

Thanks

 

Forums

wristpin Fri, 03/08/2012

Have an old Briggs and Stratton manual that shows various different configurations that they have used and there is one set where both the compression rings have an inner bevel and both the bevels are facing upwards. Second from the left.

squarefour Sun, 05/08/2012

Great! Thanks for this. I've now whipped the piston out and turned the second ring over so it's the "right" way up. Engine running like a Swiss watch again, but then it always did! BTW the original rings were 4th from the left in the diagram.

I'm currently awaiting another set of rings from a different seller off eBay, for my second (of three) 75G14 engines. Your diagram should cover whatever pattern they turn out to be!