DETROIT DIESEL
Engine Tune-Up
TIMING FUEL INJECTOR
Timing
Tool
Injector
Dimension
Number
*35
1.508
J
8909
1.484
35
J
1242
40
1.484
J
1242
45
1.484
J
1242
1.460
J
1853
S40
S40
1.460
J
1853
S50
1.460
J
1853
1.460
L40
J
1853
1.460
J
1853
N40
1.460
N45
J
1853
1.460
J
1853
N5O
*Reefer Car
To time a fuel injector properly, the injector follower
must be adjusted to a definite height in relation to the
injector body.
Fig. 3 - Timing Fuel Injector
All of the injectors can be timed, in firing order
sequence, during one full revolution of the crankshaft.
3. Place the small end of the injector timing gage (see
table for correct timing gage) in the hole provided in
the top of the injector body, with the flat of the gage
Time Fuel Injector
toward the injector follower as shown in Fig. 3.
After the exhaust valve clearance has been adjusted,
4. Loosen the push rod lock nut.
time the fuel injector as follows:
1. Place the speed control lever in the idle speed
5. Turn the push rod and adjust the injector rocker
position. If a stop lever is provided, secure it in the no-
arm until the extended part of the gage will just pass
over the top of the injector follower.
fuel position.
2. Rotate the crankshaft, manually or with the starting
6. Hold the push rod and tighten the lock nut. Check
motor, until the exhaust valves are fully depressed on
the adjustment and readjust, if necessary.
the particular cylinder to be timed.
7. Time the remaining injectors as outlined above.
CAUTION: If a wrench is used on the crankshaft
bolt at the front of the engine, do not turn the
crankshaft in a left-hand direction of rotation
8. If no further engine tune-up is required, use a new
or the bolt will be loosened.
gasket(s) and install the valve rocker cover(s).
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