4.0L rebuild - JeepForum.com
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post #1 of 2 Old 03-13-2010, 11:03 PM Thread Starter
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2000 ZJ 
Join Date: Dec 2007
Location: Harding,pa
Posts: 41
4.0L rebuild

got the engine out and the skirt on one piston broke off,so I go to order the piston and they show 2 listed one with SAE groves and the other with MM groves, and told them to order rings also but I forgot that i don't know what the other 5 piston are I ordered the SAE groved piston.Now my question is how do I know what the other 5 are below I will post the piston specs.and if I can used the rings I got. also below I will post all the casting numbers from the block.

SEALED POWER Part # H802CP More Info {Cast Piston}
Hypereutectic; 2 - 1.50mm Groove, 1 - 4.00mm Groove, 1.592 CD, Recessed Head .116 deep; DurOshield® skirt coated piston, 0.931" Pin Dia.

SEALED POWER Part # H825CP {Cast Piston}
Hypereutectic; 2 - 5/64 Groove, 1 - 3/16 Groove, 1.592 CD, Recessed Head .116 deep; DurOshield® skirt coated piston, 0.931" Pin Dia.

the number on the block are as follows
53010327AB 4.0L-34 42999

Hope someone can help


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Bovanis Towing and Service Center
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post #2 of 2 Old 03-14-2010, 10:05 AM
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2000 WJ 
Join Date: Oct 2007
Location: Asheville
Posts: 3,086
I'm 99% sure the 4.0's after '95 used metric rings. However, the bore on the 4.0's is the same, so as long as you're replacing all 6 pistons, you can simply use the proper rings for the pistons. Where are you getting the parts from? I highly recommend Falcon Global Parts and Supplies (<--google that and call their #). When I bought parts for my stroker I used the 802CPs and they were $16.55 each from Falcon!

The ring kit I used was by Perfect Circle, pt# 51870CP and it was $41.

2000 WJ 4.5L - Stroked, Locked, & Long-Armed
Looking for 6" WJ springs!
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