Diesel Engine Governor Service

 
By 10 July 2017
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Governor malfunctions—hunting, sticking, refusal to hold adjustments—can usually be traced to binding pivots. In some cases, removing the cover and giving the internal parts a thorough cleaning is all that’s necessary. If more work is needed, the governor and pump should be put into the hands of a specialist.

To appreciate why this is so, consider the matter of bushing replacement, which seems like a simple enough job. Using the CAV unit as a model, the critical bushings are those at the flywheel pivots (225 in Fig. 5-29) and the sliding bushing (231) on the governor sleeve. To remove and install the flyweights you will need CAV special tool 7044-8. Bushing press in, but factory reamers are needed to size them properly. And a governor with enough hours on it to wear out bushings will almost surely need recalibration, which can only be accomplished with a factory tooling that correlates piston stroke with rack position.