I just brought home a 2 stage walk behind snowblower with a bad engine, and have a hopeful replacement on hand. Having a 2:1 extended cam is tough to find when you need one. my replacement happens to also have the same. problem being, the crank PTO's are different between them.
the 2 engines are an HM80 8HP Tecumseh (bad engine, cam and bearing surface for it, in the block side cover are scored beyond hope) crank unhurt, mikes out as new.
I have been scouting the auctions and Craigslist recently looking for something worthy of this engine as I'm tired of watching it sit here. and adapting this one to work would be faster, easier and cheaper than any other way.. buying the parts for the original engine or seeking out another extended camshaft engine that would work on this machine. besides I'm itching to see if this "11HP" OHV really does seem more powerful than the 8HP snow king on my other blower with same cc/cid displacement.
the hopeful replacement is an OHV 11 HP Tec, model HMSK110.
both have same bore X stroke, also same crank and rod bearing journal diameter.
differences; PTO end configuration (reason for swap), dia of hole through crankpin in crank casting, thickness of counterweights; in this area the OHV engine has thicker counterweights and smaller hole thru crankpin... if I throw the lighter crank into the OHV block, will it vibrate my teeth loose from unbalance?
Plan B is to take the crank from the OHV engine and have its PTO end machined down to match the dimensions of the original engine's crankshaft so all the original pulleys and such still fit as originally set up. either way I am going to have to have a keyway cut into the end of the cam, the portion that protrudes thru the block... I have someone that can do that for me and "owes me a favor"...
being able to put the original engine's crank into the OHV engine would certainly allow me to get the machine back to blowing snow sooner.
the 2 engines are an HM80 8HP Tecumseh (bad engine, cam and bearing surface for it, in the block side cover are scored beyond hope) crank unhurt, mikes out as new.
I have been scouting the auctions and Craigslist recently looking for something worthy of this engine as I'm tired of watching it sit here. and adapting this one to work would be faster, easier and cheaper than any other way.. buying the parts for the original engine or seeking out another extended camshaft engine that would work on this machine. besides I'm itching to see if this "11HP" OHV really does seem more powerful than the 8HP snow king on my other blower with same cc/cid displacement.
the hopeful replacement is an OHV 11 HP Tec, model HMSK110.
both have same bore X stroke, also same crank and rod bearing journal diameter.
differences; PTO end configuration (reason for swap), dia of hole through crankpin in crank casting, thickness of counterweights; in this area the OHV engine has thicker counterweights and smaller hole thru crankpin... if I throw the lighter crank into the OHV block, will it vibrate my teeth loose from unbalance?
Plan B is to take the crank from the OHV engine and have its PTO end machined down to match the dimensions of the original engine's crankshaft so all the original pulleys and such still fit as originally set up. either way I am going to have to have a keyway cut into the end of the cam, the portion that protrudes thru the block... I have someone that can do that for me and "owes me a favor"...
being able to put the original engine's crank into the OHV engine would certainly allow me to get the machine back to blowing snow sooner.