How to Fix a Leaking Duramax Oil Cooler (LB7, LLY, LBZ, LMM)
Автор: Ark
Загружено: 2025-05-03
Просмотров: 13043
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** Do NOT leave the tube out between the oil cooler and water pump when reinstalling the cooler like I did... Driver side motor mount will have to be removed in order to get it back it. **
If your Duramax is leaking oil near the rear of the engine, the oil cooler might be the culprit. In this video, I walk you through the full process of replacing a leaking oil cooler on a 2005 LLY Duramax. This repair is very similar for LB7, LBZ, and LMM engines as well. I cover tips for accessing the cooler, cleaning surfaces, and reinstalling everything properly.
⚠️ Common signs of a bad oil cooler:
Oil dripping near the back of the engine.
Coolant dripping near back of engine.
Coolant in the Oil (in extreme cases)
/ @ark2002
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