Check Belt Tensioner When Replacing Water Pump on Mercedes-Benz 300E

A coolant leak may develop from the water pump. When replacing the water pump, the drive belt tensioner should be inspected and most likely replaced as well.

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Average mileage: 182,500 (130,000–235,000)
4 model years affected: 1990, 1991, 1992, 1993
6 people reported this problem
2 people shared problem details
Belt became loose & inspection revealed rubber bushing detached from tensioner. Full replacement fixed problem.
I've had to have the water pump replaced 3 times beginning at 130,000 miles every other year. After the water pump was replaced the tensioner had to be replaced.
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