DETROIT DIESEL 53
14 Engine Tune-Up
3. Adjust the governor gap.
4. Position the injector rack control levers.
Normally, when performing a tune-up on an engine in
5. Adjust the maximum no-load speed.
service, it is onIy necessary to check the various
adjustments for a possible change in the settings.
6. Adjust the idle speed.
However, of the cylinder head, governor, or injectors
have been replaced or overhauled, then certain
preliminary adjustments are required before the
7. Adjust the buffer screw.
engine is started.
The preliminary adjustments consist of the first four
items in the tune-up sequence. The procedures are the
same except that the valve clearance is greater for a
NOTE: Use new valve rocker cover gasket(s)
cold engine.
after each tune-up.
To tune-up an engine completely, all of the
adjustments are made by following the applicable
tune-up sequence given below after the engine has
reached the normal operating temperature. 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
Tune-Up Sequence for Mechanical Governor
1. Adjust the exhaust valve clearance.
2. Time the fuel injectors.
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