Coating Wrist Pin Bores

[PLohr]

Hello, guys. Has anyone had success with an abradable or other coating for the purpose of bringing wrist pin bores back down to the OE clearance range?

The application is a 2-cylinder engine, a Briggs Vanguard engine. I purchased new OE pistons but I don't want to use them since they lack the basic features of the original OE pistons.

Thank you for any help.

[PackardV8]

Carefully measure the ring grooves against the new rings. It would be unusual for the pin bores to be worn past spec without some wear in the ring grooves.

FWIW, back last century, I had an 8hp Briggs single and when I refreshed it, the only areas out of spec were the piston pin bore/rod small end clearances slightly over. Since this was just a home riding mower, I honed the cylinder, new rings, ground the valves and put it back in service. Upon cold startup, I could hear the faint noise in the top end, but when up to operating temp the noise went away and ran that way for another ten years. When the mower was sold, it was still running well; thirty years of hard use on that little B&S aluminum block and the aluminum rod running directly on the crankpin and piston pin.

[modok]

If the pin is loose, just use a bigger pin.

[PLohr]

Jack - That is helpful. Thanks for sharing your experience.

Modok - thank you. Do you know where can I find larger wrist pins for a Briggs motor?

[BOOT]

Jack - That is helpful. Thanks for sharing your experience.

Modok - thank you. Do you know where can I find larger wrist pins for a Briggs motor?

Seems it's often a custom deal, to get things how you want em. But if it was off the shelf, then everyone else would do it