Know the Difference Between the HMMWV 6.2L and 6.5L Detuned Engines

There’s confusion when it comes to identifying the 6.2L and 6.5L detuned engines used in basic and A1 HMMWV models.  How do we know?
TACOM LCMC says the HMMWV engine repair program is receiving unserviceable 6.2L engines mislabeled as 6.5L detuned engines.  So why is that a problem?
All unserviceable 6.2L engines must be sent to DLA Disposition Services (formerly called DRMO), and replaced with the 6.5L detuned engine, NSN 2815-01-439-6664.  The 6.5L detuned engine is a drop-in replacement for the 6.2L engine.  And all unserviceable 6.5L detuned engines must be sent to the HMMWV engine repair program.
If you can’t tell the difference between the engines, you won’t know where to send them.  So here’s some help:
You can identify the 6.2L engine by looking at the rear of the engine block, between the cylinder heads.  Locate the oil pump/tachometer drive mount bolt on the top of the engine.  If the bolt is on the left-hand side of the oil pump/tachometer drive, and there’s no turbocharger mount casting in front of the oil pump/tachometer drive, you’ve got a 6.2L engine.

09  HMMWV 6.2L Engine_Page_1
And you can identify the 6.5L detuned engine by looking for the mount bolt on the right-hand side of the oil pump/tachometer drive.  You’ll see the turbocharger mount casting in front of the oil pump/tachometer drive.

09  HMMWV 6.2L Engine_Page_2
If you still need help identifying your engine, get some help from TACOM’s HMMWV engine maintenance manager at 586- 282-4738.
Remember, your unit’s unserviceable 6.2L engines go to DLA Disposition Services and unserviceable 6.5L detuned engines go to the HMMWV engine repair program.  Make sure those unserviceable engines are correctly labeled and sent to the right location.
TACOM’s HMMWV engine item manager can assist you with any disposition issues you may have.  He’s at 586-282-4734.

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One Comment on “Know the Difference Between the HMMWV 6.2L and 6.5L Detuned Engines”

  1. Selby says:

    How can you determine the yeah of a 6.5? I have a k5 blazer that was changed from a 6.2 to a 6.5 military diesel. However I do not know the year of the engine.


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