• Welcome to the new NAXJA Forum! If your password does not work, please use "Forgot your password?" link on the log-in page. Please feel free to reach out to [email protected] if we can provide any assistance.

Rod bearing size markings on block?

jeepnfreak

NAXJA Forum User
Location
AL
In searching out all info I could find on low oil pressure I came across something to the effect that the factory sometimes matched the rod bearings to the crank and marked on the block which were used on each journal. Someone else came along and added which codes were for which size. I have spent hours trying to find my way back to that post, but have had no luck. Anyone know where I can find this info again, or can explain it? Thanks Don
 
Sorry, 1992 XJ Limited, 4.0 AW4, 4WD. Possible donor motor is from 1995 ZJ, 4.0 42RE, 2WD. Donor is pretty clean and has letters painted by the bores on distributer side. I am wondering if it has a mix and match bearing set in it from factory. The letters are C's and D's btw. Thanks Don
 
Sorry, 1992 XJ Limited, 4.0 AW4, 4WD. Possible donor motor is from 1995 ZJ, 4.0 42RE, 2WD. Donor is pretty clean and has letters painted by the bores on distributer side. I am wondering if it has a mix and match bearing set in it from factory. The letters are C's and D's btw. Thanks Don

According to the service manual those letters on the block are for the piston bore size. The rod bearing letters are stamped on the rod/rod bearing caps.
 
According to the service manual those letters on the block are for the piston bore size. The rod bearing letters are stamped on the rod/rod bearing caps.

CYLINDER BORE SIZE PISTON LETTER SIZE
98.438 - 98.448 mm (3.8755 - 3.8759 in.) A
98.448 - 98.458 mm (3.8759 - 3.8763 in.) B
98.458 - 98.468 mm (3.8763 - 3.8767 in.) C
98.468 - 98.478 mm (3.8767 - 3.8771 in.) D
98.478 - 98.488 mm (3.8771 - 3.8775 in.) E
98.488 - 98.498 mm (3.8775 - 3.8779 in.) F
 
Back
Top