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Engine Failure On 1978-89 Mercedes Benz 3.0L Diesel Engines
The AERA Technical Committee offers the following information regarding engine failure on 1978-89 Mercedes Benz 3.0L diesel engines. This failure has been reported on vehicles with high mileage or shortly after a partial engine repair.
The damage reported has ranged from lack of compression to catastrophic component failures. The cause of these failures has been related to a lack of tension on the engine?s timing chain, allowing piston to valve contact. The reason for insufficient tension on the timing chain is a broken chain tensioner spring. See Figure 1 below to view one such spring that broke shortly after the cylinder head and tensioner were re-installed. The spring fatigued and broke after the outside diameter of the coil wire had worn excessively.
The timing chain tensioner requires removal and re-installation anytime the cylinder head is removed. It is therefore advised to replace this spring, Part # A1109933901 anytime the tensioner is removed.
The AERA Technical Committee
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