Which 48mm & 52mm main bearing size? Photo.

[Suba_GL_87]

I'm not sure what code stand of? Left side is 2001 ej25. Right side is 1996 ej25

Let me know how can tell 48mm and 52mm crankshaft main bearing size?

 

Thanks!

[Suba_GL_87]

Edited July 1, 2014 by Suba_GL_87

[86BRATMAN]

It's the rod bearings not the main bearings that are different sized.

[ocei77]

You can't tell from the markings. The 2001 is a 52mm crank and the 96 is 48. Also the thrust bearing ( the one with the flanges) is in position 5 on the 01 and 3 on the 96.

The first group of letters gives the tolerances for the crank. A is std. B=.03, C=.05 and D= .25. This is all listed on the engine spec page in the fsm.

The four others are the rod bearing tolerances.. Haven't figured out those, except that the first being all I's says they are at least the same.

This is part of the reason why rebuilding is so cost prohibitive. In order to use the same bearings, the crank must be machined. Subaru does sell crank bearings individually, but you better be sure of the measurements. You won't be able to return them.

Rod bearings only come in sets.

 

O.

[86BRATMAN]

There is a very good chance that the 01 crank has the machining from the factory to use the #3 thrust location. I've had a couple early ej251 cranks that have been machined for both.

[Gloyale]

I'm not sure what code stand of? Left side is 2001 ej25. Right side is 1996 ej25

Let me know how can tell 48mm and 52mm crankshaft main bearing size?

 

Thanks!

 

Use a dial caliper and measure the rod journal.

 

If you can't use a dial caliper you shouldn't be dealing with engine internals.