AutoZone 2012 Mitsubishi Galant SE 2.4L MFI SOHC 4cyl | Repair Guides | General Information & Maintenance | Serial Number Identification | Engine | AutoZone.com

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    Jeep Wrangler/YJ 1987-1995 Repair Guide

    Engine

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    2.5L ENGINE



    See Figure 1



    Click image to see an enlarged view

    Fig. Fig. 1: Location of an engine identification number-2.5L engine

    The engine serial number for the American Motors-built 2.5 Liter engine is located on a machined pad at the rear right side of the block, between the No. 3 and No. 4 cylinders.

    The digits of the code identify:

    1. 1st digit-The year (3 = 1993).
    2.  
    3. 2nd and 3rd digits-The month (01-12).
    4.  
    5. 4th and 5th digits-The engine type/fuel system/compression ratio (HX = a 2.5 liter [150 CID] 9.1:1 compression ratio engine with a multi-point fuel injection system).
    6.  
    7. 6th and 7th digits-The day of engine build (01-31).
    8.  

    For example: Engine code 301HX23 identifies a 2.5 liter (150 CID) engine with a multi-port fuel injection system, 9.1:1 compression ratio and built on January 23, 1993.

    Also on the block, just above the oil filter boss (near the distributor), is the oversized/undersized component code. The codes are explained as follows:



    Letter B: cylinder bores 0.010 in. (0.25mm) over
     
    Letter C: camshaft bearing bores 0.010 in. (0.25mm) over
     
    Letter M: main bearing journals 0.010 in. (0.25mm) under
     
    Letter P: connecting rod journals 0.010 in. (0.25mm) under
     
    Letter PM: main bearing journals and one or more connecting rod journals 0.010 in. (0.25mm) under
     

    4.0L AND 4.2L ENGINES



    See Figures 2 and 3



    Click image to see an enlarged view

    Fig. Fig. 2: Location of an engine identification number-4.0L and 4.2L engines

    The engine code is found in the identification plate on the firewall. The second location is on a machined surface of the block between number 2 and 3 spark plugs. For further identification, the displacement is cast into the side of the block. The letter in the code identifies the engine by displacement (cu. in.), carburetor type and compression ratio.

    All of the engines have the same undersize/oversize letter codes, located on the boss directly above the oil filter (near the distributor. The parts size code is as follows:



    Letter B indicates 0.010 in. (0.25mm) oversized cylinder bore.
     
    Letter M indicates 0.010 in. (0.25mm) undersized main bearings.
     
    Letter P indicates 0.010 in. (0.25mm) undersized connecting rod bearings.
     
    Letter C indicates 0.010 in. (0.25mm) oversized camshaft block bores.
     



    Click image to see an enlarged view

    Fig. Fig. 3: ENGINE IDENTIFICATION

     
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