ANALYSIS OF THE CAUSE OF TRIBOLOGICAL DAMAGE TO VALVE ROCKERS IN A DIESEL ENGINE
DOI:
https://doi.org/10.26408/136.02Keywords:
rocker arm damage, incorrect timing system setting, exhaust valves, tribological wearAbstract
This describes the consequences of a Volvo V70 diesel engine failure, as well as the development of this failure and its immediate cause. The engine was damaged 68 km after the timing belt had been changed. Preliminary analysis demonstrated strong material wear at the rocker arms of the exhaust valves, while not showing a similar wear on the intake side. Analysis of the timing belt replacement process shows that when the prescribed repair procedure is not followed, the timing system on the floating wedge can be set incorrectly and this may cause the exhaust valves to collide with the pistons. The collision caused cyclic overload in the friction nodes between the valves and rocker arms, resulting in engine damage. The aim of this paper is to indicate possible methods for determining the actual causes of tribological damage in internal combustion engine components. In addition, it is intended to serve as an example of the consequences that may result from non-compliance with the service instructions.
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