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Location:
Sydney
Registered:
March 2003
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Re: jza70 - oil pump or bearings?
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Tue, 09 March 2004 20:17
 
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The oil pump is located on the front of the crank on the JZ engines, so you'll have to remove the crank pulley, the covers, cam belt, water pump and sump and the whole front lower cover to be able to get to it - is accessed via a rear cover, 8-10 screws from memory.
They are a thickness reference of the bearing, which in turn sets the bearing clearances - this can be worked out from getting the number on the exhaust side of the rod (for example, on my 2j, all rods had a number 2) and then on the crank (front counter weight from memory, although it could be the rear 1, it's easy enough to tell, 1 has 7 digits (mains) and the other has 6 (rod big ends)) each 1 references to the size of the crank pin and the big end diameter in the rod.
so, if the crank has a 0, and the rod has a 2, you'd require a bearing number 2 - Bearings go from 1 through to 5.
If you've done a big end bearing, chances are the crank journal won't be looking too flash. You could be lucky and it might be ok, time will tell.
If it is a big end bearing failure, you'll need to replace rod bolts as they're TTY bolts - and in most cases when rod bolts are changed they recommend resizing the big end - something that can't be done with the rod/piston still in the engine.
Might be cheaper to find another motor.
I couldn't find any pictures of the marking on the original rods, but my aftermarket rods have the numbers - exhaust side of the rod, there is the number 'S2' machined into the rod - this is the big end size, stock rods will just have the number.
[Updated on: Tue, 09 March 2004 20:22]
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