Tecumseh OHH65 parts pictures and mods?

[65ShelbyClone]

I posted this topic on the 4cycle forums about a week ago with a less-than-stellar reaction. It was regarding a Craftsman 6.5hp chipper I got a few weeks ago with a clean Tec OHH65.

I was reading over there that the OHV Tecs are actually pretty fragile as these engines go. Some of the experienced builders mentioned that they need a lot of work to make them work, but nothing was real specific except about the the Flexy-Flier crankshafts and small crankcases. I was hoping someone had some pics they could post of the internal engine components....things like the chamber, ports, crankcase, piston, rod, valvetrain, cam, or whatever so I could get an idea of what I would be dealing with and what needs attention.

 

[65ShelbyClone]

No one?

I know enigma had one for sale on "that" forum a while back and I found the pictures, but they were just outside shots of the engine.

 

[enigma]

Stock rod:

Need anything else, pm

 

[65ShelbyClone]

Excellent! Thank you very much!

I pulled the OHH65 off of the chipper today only to find that it has a 1" shaft that tapers down to 7/8". I guess that's alright, at least it can be turned down to 3/4". More to come later....

 

[65ShelbyClone]

I pulled the head off today and it looks considerably different than that one. The chamber is a different, more open shape and the rocker "stud" pedestals are separate towers. The valves are tiny and the ports are horrible as well. No wonder Hondas are the engine of choice. :doah:

 

[enigma]

Honestly, the only thing that will look the same will be the outside of the block! Everything else has been modified to some extent, the head had the most mods, I made the mistake of selling the unfinshed billet flywheel....

a note on the rocker studs, if you plan to go very big on the cam they need to be heli coiled (1/4-28) or they WILL pull out

 

[65ShelbyClone]

Yeah, but I was noticing the actual casting differences. How old is the engine in the pictures you posted? Mine says it meets CARB 2006 standards, so it's probably no older than 2005.

 

[enigma]

Not for sure of exact age, but can guarantee it's older than 2006! The OHH 55-70 are all the same engine , I believe this was originally marketed as a 55