Mercedes-Benz 300E Problems

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

Problem Description and Possible Solution

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.

(6 people reported this problem)

Mercedes-Benz 300E Vehicles With This Problem

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Average mileage: 182,500 (130,000–235,000)
4 model years affected: 1990, 1991, 1992, 1993
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Viewing 1-2 of 2 comments
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.