24 – 4.0 Engine date codes

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CRUISER'S MOSTLY RENIX TIPS

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.

 

Revised 1-31-2016