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  #1  
Old July 31st, 2020, 13:18
AK47NA AK47NA is offline
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oversize component code B, so what?

1994 xj, 2.5 l stick shift 4wd, 220,000 miles. I need advice on the oversize component code B stamped on my engine block on the distributor side. The 1994 FSM says all cylinder bores are .010 inch oversized. Am I correct to assume that if I had the cylinders rebored 0.01 inch over then I have to install .020 over components (e.g. rings and pistons)?

I am here in Holland and would like to be sure before I do something stupid.

Thanks!
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Old July 31st, 2020, 14:02
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Saudade Saudade is offline
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Re: oversize component code B, so what?

That's how I would read it. Piston and rings are already .010" (.254mm) oversize. Next step up would be .020" (.508mm).

I would wait for others to respond before buying anything.
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Old July 31st, 2020, 14:57
AK47NA AK47NA is offline
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Re: oversize component code B, so what?

Thanks, @Saudade. I figured the same but wanted to hear what others think. I'll know more about the condition of the cylinders when I disassemble the engine and will decide what size to go then.
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Old July 31st, 2020, 18:12
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Re: oversize component code B, so what?

You should consider having a machinist take a look at the block before you order pistons and rings. If the cylinders have a lot of wear, it would not be unusual for them to recommend that you go to 0.030 over. I have seen stock blocks that required a 0.040 overbore in order to get the cylinders into usable condition.
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Old July 31st, 2020, 22:25
AK47NA AK47NA is offline
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Re: oversize component code B, so what?

Yes, a friend is a machinist here, helping me on the side. I just wanted to be sure about the piston and ring sizing because of the component code B stamped on the block. But he will be doing the measurements during the teardown. Thanks.
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Old August 2nd, 2020, 17:02
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Re: oversize component code B, so what?

The final reading made by your machinist is the important one. If you were only doing a re-ring or replacing pistons with out major block prep, the .010" over would be important. But, as I said previously, once the block has been prepped for assembly, then the numbers the machinist punched it to are all that matters.
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