MJ Jeep Tech

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Join date : 2018-04-07

4.0L Engine Date Codes

on Sat Apr 07, 2018 5:13 pm
4.0L Engine Date Codes

The date code is on the passenger side of the engine, on the block, just forward and up from the distributor on a machined flat surface.

The digits of the code identify:
•1st Digit-The year (8 = 1998).
•2nd & 3rd Digits-The month (01 – 12).
•4th & 5th Digits-The engine type/fuel system/compression ratio (MX = A 4.0 Liter (242 CID) 8.7:1 compression ratio engine with a multi-point fuel injection system).
•6th & 7th Digits-The day of engine build (01 – 31).

FOR EXAMPLE: Code * 801MX12 * identifies a 4.0 Liter (242 CID) engine with a multi-point fuel injection system and 8.7:1 compression ratio that was built on January 12, 1998.
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