I had the water pump fail on two of my CDIs...one at about 150k, the other about 210k. "Coolant Low" message was the telltale indicator. I couldn't find a bad leak, or coolant in the oil, or white exhaust. It was a slow leak while driving, nothing even on the garage floor.


Neither of mine however, failed catastrophically like yours. I never lost the belt or gouged the block.

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Mark in MA
05 MB E320CDI 402k Granite Grey Metallic
05 MB E320CDI 267k Black
05 MB E320CDI 232k White
05 MB E320CDI 209k Tectite Grey
99 Dodge 2500 Cummins 5sp 148k
62 Jeep CJ-6 120k

thats pretty bad. The diesel noise of the motor covers rough rumbling at idle, it must have been rumbling for a while.

With such kind of failure - flush the system till you get sick and tired of flushing - open all drains and rig up your garden hose to wash every metal shaving out.

I have seen such a fail take out the next 4 water pumps due to the metal in the coolant.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)