| Author | Message | ||
     Kiwidave |
Currently rebuilding my XB12 engine and am going to fit a new crank and have the choice of the 4 different pinion bearings. I have been told there should be a number stamped on the inside of the engine casing which should either be a 1,2 or 3. The number 28 is stamped inside my case so I am hoping the 2 relates to the bearing but am a bit confused by the 8. Here is a photo of the numbers. Does the 2 relate to the pinion bearing size? Thanks  | ||
| Ericz |
I'm not sure I would use any number stamped inside the case to tell you the bearing you should use. You really should measure the bearing race with a calibrated set of bore mics. The measurement should be down to the 0.0001" (Ten-thousandths of an inch) | ||
| Odd |
I thought the stamp was on the cam side of the case? I agree with Ericz I would measure the bore | ||
| Kiwidave |
Thanks for your comments. I totally agree the best way would be to measure the outer race but I've become a bit frustrated trying to find someone who can measure that precisely. The local Harley Dealership and a custom bike shop couldn't tell me where to get the job done and pretty much said that it doesn't need to be that exact as its not a race bike. Also enquired at the local bearing supplier hoping they knew of an engineering workshop who could do it but they had no idea. I'll keep searching and hopefully find someone who can do it. Thanks. | ||
| Ericz |
A good machine shop should have bore mics that can measure those numbers. I used to measure throttle body bores to that precision at the machine shop I worked at. |
