Since the adjustments are normally made while the engine is stopped, it may be necessary to run the engine between adjustments to maintain normal operating temperature. To tune-up an engine completely, perform all of the adjustments in the applicable tune-up sequence given below after the engine has reached normal operating temperature. After the governor and the injector rack adjustments are completed, the supplementary governing device must be re-connected and adjusted. Note: If a supplementary governing device such as a throttle delay mechanism is used, it must be disconnected prior to the tune-up. The procedures are the same except the valve clearance is greater for a cold engine. The preliminary adjustments consist of the first four items in the tune-up sequence. However, if a cylinder head, governor, or injectors have been replaced or overhauled, then certain preliminary adjustments are required before the engine is started.
Normally, when performing a tune-up on an engine in service, it is only necessary to check various adjustments for a possible change in settings. A single-weight variable speed governor name plate is stamped S.W.-V.S. stamped name plate denotes a double-weight limiting speed governor.
The mechanical governor is identified by the plate attached to the governor housing. The following types of governors are used. Since the application of the governor has different characteristics, the tune-up procedure varies accordingly. The type of governor used depends on the engine applications.
Minor adjustments to the valve and injector operating mechanism, gover, etc should only be required periodically to compensate for normal wear and tear on parts. As long as the engine’s performance is satisfactory, no tune up should be needed. Your 92 series engine has no scheduled interval for performing an engine tune-up. In this article we cover a basic tune up for a Detroit Diesel 92 Series engine. Guide To Tuning Up Your Detroit Diesel 92 Series Engine