hi guys after checking and rechecking the crank l. IM not 100% happy its all fine. Iv desided that im going to replace the crack completely. Iv tryed to find out what bearings are on the old crank i can only find one bearing that has a part number this number comes up as a 65mm main bearing the bearing that bearing is the centre one that sound right? Now the thing i need to ask is how do i no what bearings i need for the rest. If someone can help me out with what n how i measure that would be great. This engine is killin my brain help me.
the crank iv got my eyes on comes with std 65mm main bearings and std 22mm thrust bearing? The crank has been ground .025. What i need to no is how do i measure my old one? If you get what i mean. Thanks
You need bearings to match both your crank and also the case. If the bearings you have do not have markings other than a part number, it's most likely they are standard size and neither the case and crank have been machined. You need to measure to be sure though. Measure the crank with a vernier or micrometer - the journals get machined in 0.25mm stages so you need something reasonably accurate to measure them. The case saddles get machined 0.5mm at a time so a decent ruler across the saddle should make it obvious. The thrust gets machined in 1mm chunks, again very easy to measure with a ruler. What I haven't covered of course is wear. To check the crank is straight, journals aren't ovalled, thrust isn't worn and saddles are still round needs someone with the gear to measure a lot more accurately. The wear on your existing bearings and the state of the journals is a good guide to arouse any suspiscions
thanks zed Il get out and measure them then the bearing in the middle has a part number. I put that in good old google and it comes up with 65mm Il measure the others in a second. Thanks again
