Finding some nasty damage while stripping down an old engine I got a year ago.
The primamry chain had snapped which chewed up a number of the primary cover screw areas as well as the tensioner aduster screw area. Tacho mounting threads stripped etc etc.
Most of it seems repairable though. The crank looks good also.
There was some colouting on one of the small ends. Im not too experienced with these engines so would like your advice if you beleive the small end seized/ran way too hot(lean?) or is that normal colouring?
the first pic is form the good piston [img:left][/img]
these next two are from the suspect piston
I'm guessing new con rods are in order?
Last edited by BrettF; 10/18/1510:46 pm.
3D TV: A format that lost a format war without even having an opponent. Bikes: 69 T120 on average (1967 rolling frame and 1971 Bonnie engine) 57 T110 on average (58 rolling frame - with 55 iron head engine)
I agree that looks normal if not pretty clean for most any engine. Once you have the pins out, take a look at the bottom of the piston dome. That will tell more about the running conditions of the engine.
There should be an even color inside the dome area. Black ash or shiny areas surrounded by black ash mean it was run too lean or to far advanced on the timing.
Back to the pins... They should press out pretty easily. Almost by hand pressure. If needed a large "C" clamp, a socket the same size (slightly smaller) than the pin, and I use a plastic piece from a cutting board as a backer on the opposite side with a piece of pipe the pin can pass into.
Re: Stripping down an old Tr6 engine - had it seized?
#622349 10/19/155:06 am10/19/155:06 am