How to tackle the "dreaded" Duramax water pump replacement in four hours. THANKS TO ITS RELIABILITY, FUEL EFFICIENCY, AND PERFORMANCE. potential, GM's 6.6L Duramax diesel enjoys a very loyal following in the heavy-duty pickup segment. One of the most sought-after engines of the lot is the LBZ version. Available from '06-'07, the LBZ represents a period in Duramax lineage where the LB7's ('01-'04) injector problems had been addressed, the LLY's ('04.5-'05) overheating issues were solved, and the most stringent emissions controls had yet to be implemented (LMM, '07.5-'10). But even though the LBZ's rock-solid reputation precedes it, minor repairs are inevitable from time to time. After the '06 Chevy Silverado 2500 HD in this story displayed a low-coolant message on the dash, we detected a Dex-Cool leak at the front of the engine, and it was time for a new water pump.
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