HI!
I have a Tecumseh HSK850 8312B on a Toro snowthrower and am replacing the piston assembly. P/N 310291A is a newer replacement sub for the number on my original parts list. The rod, piston and bearings all were shipped loose and need to be assembled and this is not covered by my original Tecumseh Technicianç—´ Handbook probably as itç—´ for the older style parts? I could use a little guidance getting the piston pin bearings in place as well as how best to install the 31 needle bearings, etc. It looks like the pressed in steel rod liner is actually separate and needs to be pressed in also. The Tech Manual stresses that the steel bearing liner has a flange that goes towards the flywheel end of crankshaft but I don't see how that applies to these replacement parts? The piston instructions refer to the cast in side of the pin retainer to face the PTO end but the substitute parts use a C-clip in both sides so that doesn't apply either.
Is there a technical bulletin covering this new assembly that anyone has seen? I will attach a photo of the many pieces I have to work with.
Thank you for any assistance you can offer. JIM
I have a Tecumseh HSK850 8312B on a Toro snowthrower and am replacing the piston assembly. P/N 310291A is a newer replacement sub for the number on my original parts list. The rod, piston and bearings all were shipped loose and need to be assembled and this is not covered by my original Tecumseh Technicianç—´ Handbook probably as itç—´ for the older style parts? I could use a little guidance getting the piston pin bearings in place as well as how best to install the 31 needle bearings, etc. It looks like the pressed in steel rod liner is actually separate and needs to be pressed in also. The Tech Manual stresses that the steel bearing liner has a flange that goes towards the flywheel end of crankshaft but I don't see how that applies to these replacement parts? The piston instructions refer to the cast in side of the pin retainer to face the PTO end but the substitute parts use a C-clip in both sides so that doesn't apply either.
Is there a technical bulletin covering this new assembly that anyone has seen? I will attach a photo of the many pieces I have to work with.
Thank you for any assistance you can offer. JIM
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