Piston for 1958 GAS 841 POWERMASTER Cu In 172

Sledder · Aug 27, 2020

I'M rebuilding the engine after sitting on my Dad's farm for 10+ years. The pistons are 4" with (3) compression rings and (1) oil ring [2 rings and oil swiper]. Steiner and my local New Holland/Ford dealer can only locate pistons that have (2) compression rings.
Is the POWERMASTER 841 the reason mine has 3 comp. rings, compared to a plain 841??
One local mature farmer thought maybe someone replaced, with a diesel piston, on a previous rebuild. Which my dad's notes confirm it was rebuilt, sleeved, pistons and rings in 1973 but no notation of a piston switch.

Thanks for any knowledge you could share of where to source and why the 3 rings on my POWERMASTER.

Model on frame is 841-S, SN 40059

Fordfarmer · Aug 27, 2020

My first thought is aftermarket pistons,
that happened to use an "extra" ring.

WayneIA · Aug 27, 2020

M & W made a 4" piston and sleeve kit for that 172 engine, but I don't recall that having 4 ring pistons. I put a set of them in my 960 back in the late 1960s. Don't recall much power increase but I do remember that it used oil! The M & W Company was originally in Gibson City IL. Don't know if they still exist

Piston for 1958 GAS 841 POWERMASTER Cu In 172

Sledder

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Fordfarmer

Well-known Member

WayneIA

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