Hey fellas, I'm after some advice regarding bearing measurements. Currently in the middle of an engine rebuild I'm looking at ordering some Clevite main and rod bearings through Rob at RGS. Me and my mate measured up the stock crank that we are using as well as the torsioned down girdle for the exterior main bearing measurements and came up with the following: Rod Journals: 49.965 mm (internal/crank) Main Journals: 62.955 mm (internal/crank) 66.65 mm (external/girdle) The engine was a running engine and all the components are being re-used. I'm fairly certain that these measurements suggest standard sizes for the bearings but was hoping that someone with some experience and knowledge would be able to confirm. My mate asked Rob but he apparently wasn't 100% sure. Cheers!
RE Thanks for the reply, Still have the old bearings and after a closer look at them there is 'Nissan STD' stamped right there in the face. Nothing like over complicating something. I'll go ahead and order standard sized bearings . Thanks again!
There's a guide in the service manual on how to read a little code on the crank somewhere that has bearing sizes. Pretty sure it's a sudoku puzzle in heiroglyphs though so good luck.
Hi are you Shea's mate? You really need to measure the bearing clearances properly as per the FSM, and from there we can work out what size bearings you need. I've sent a link through to Shea that details the procedure, it's a drag but you really need to get these things "right" the first time around.
Follow Robs suggestion and measure the crank size. He is telling you to do this for a reason. The crank was more than likely standard size when it was new that is why the bearings maybe stamped standard but it has now done a few k's that is why you need to go by the crank measurement not the bearing size. Sure it will run on standard bearings but how long before you get accelerated wear due to incorrect bearing clearance. It may be a pain in the arse but it is the reason Rob tells you he doesn't know what size bearings you need. He is doing you a favour as a lot of parts guys would just send you standard ones. It wouldn't hurt to check the journal condition and measure across a few places to get an average. I hope this explains why you need to measure. Cheers Dave
