Got crank?

[SeanKewley]

During my seasonal tear down I noticed this on the crank shaft of my CMB 45HR.

Anyone have a spare crank? The needle bearings look OK... one is a bit out of round. Regardless, I'll be racing it until it lets go or I get some new guts for it.

 

[camaroboy383]

wowy,,,,,,,,,,, dont take this personal,,, but looks like sombody let some moisture reside in the engine.. ...once the water corrodes the finish on the pin,, its like loosing the enamel on your teeth...its only a matter of time before you get a cavity ..

best of luck on your parts find sir..

alden

 

[dave roach]

When replacing the crank I would replace the needle bearing.They may look good but if you look at then under a micro scope you will see that they are pitted.Looking at the rust on the crank I would say replace both and save your self from doing it again.

Dave Roach

 

[Mark Bullard]

When replacing the crank I would replace the needle bearing.They may look good but if you look at then under a micro scope you will see that they are pitted.Looking at the rust on the crank I would say replace both and save your self from doing it again.

Dave Roach

From the looks of it I would say the rod is bad also.

 

[SeanKewley]

Yep. The rod, needle bearings, and crank all need replacing.

 

[SeanKewley]

I called Stu Barr and ordered a new crank, connecting rod, needle bearings, new wrist pin, and wrist pin clips. $178 shipped. I decided to NOT race it this Sunday and wait for the new parts to arrive.

 

[Tom Foley]

When replacing the crank I would replace the needle bearing.They may look good but if you look at then under a micro scope you will see that they are pitted.Looking at the rust on the crank I would say replace both and save your self from doing it again.

Dave Roach

From the looks of it I would say the rod is bad also.

Absolutely ..don't run that or you will risk destroying whats left of that engine !!Wow , more after run oil and flushing of that engine is in order . Never seen a needle bearing crank that bad . That damage started as rust and there you go .

I called Stu Barr and ordered a new crank, connecting rod, needle bearings, new wrist pin, and wrist pin clips. $178 shipped. I decided to NOT race it this Sunday and wait for the new parts to arrive.

Smart move Sean .