Coolant temp level increased.

TM 9-2320-387-10 (Oct 97, w/Ch 2) says HMMWVs with 6.5 liter turbocharged engines (M1113, M1114, M1116, M1151, and M1152) that run at coolant temperatures above 230[degrees]F are NMC.

But, according to the manufacturer's specs, those engines are designed to withstand a maximum top tank temperature of 250[degrees]F ([+ or -]5[degrees]F).

So what does that mean to you?

According to TACOM maintenance advisory message (MAM) 05-037, a temperature gauge that reads about 230[degrees]F no longer makes the vehicle NMC. If the temperature gauge reaches 240[degrees]F, you should use caution and be aware of the vehicle's performance. If the HMMWV's transmission defaults to second gear, slow down if the OPTEMPO permits.

Until TM 9-2320-387-10 can be updated, pencil in this change to PMCS Item 16c on Page 2-39. For the straight scoop, check out the MAM on-line: https://aeps2.ria.army.mil/commodity/mam/tacom_wn/05/mam05-037.html

You'll need a AEPS username and password to view the MAM. You can also access it using your AKO username and password.

YOUR ENGINE TEMPERATURE GAUGE HIT 230[degrees]F!

GUESS THAT MEANS YOU'RE NMC!

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NOPE! NOT ANYMORE! TACOM MAM 05-037 RAISED MY LIMIT!

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