DETROIT DIESEL
Engine Systems
6. Remove the injector clamp bolt, washer and clamp.
7. Loosen the inner and outer adjusting screws on the
injector rack control lever and slide the lever away
from the injector.
8. Free the injector from its seat as shown in Fig. 3
and lift it from the cylinder head.
9. Cover the injector hole in the cylinder head to keep
foreign particles out of the cylinder.
Install Injector
Before installing an injector, be sure the beveled seat
of the injector tube is free from dirt particles and
carbon deposits.
A new or reconditioned injector may be installed by
reversing the sequence of operations given above for
removal.
Be sure the injector is filled with fuel oil. If necessary,
add clean fuel oil at the inlet filter until it runs out the
outlet filter.
CAUTION: On four valve cylinder heads, there
Fig. 3 - Removing Injector from Cylinder Head
is a possibility of damaging the exhaust valves
if the exhaust valve bridge is not resting on the
Remove Injector
ends of the exhaust valves when tightening the
rocker shaft bracket bolts. Therefore, note the
An injector may be removed in the following manner:
position of the exhaust valve bridge before,
during and after tightening the rocker shaft
1. Clean and remove the valve rocker cover.
bracket bolts.
2. Disconnect the fuel pipes from both the injector and
Do not tighten the injector clamp bolt to more than
the fuel connectors.
20-25 lb-ft (27-34 Nm) torque, as this may cause the
moving parts of the injector to bind. Tighten the
3. Immediately after removing the fuel pipes, cover
rocker shaft bolts to 50-55 lb-ft (68-75 Nm) torque.
the injector inlet and outlet fittings with shipping caps
to prevent dirt from entering.
Align the fuel pipes and connect them to the injector
and the fuel connectors. Use socket J 8932-01 and a
4. Turn the crankshaft manually in the direction of
torque wrench to tighten the fuel pipe nuts to 12-15 lb-
engine rotation or crank the engine with the starting
ft (16-20 Nm) torque.
motor, if necessary, until the rocker arms for the
particular cylinder are aligned in a horizontal plane.
CAUTION: Do not bend the fuel pipes and do
not exceed the specified torque. Excessive
CAUTION: If a wrench is used on the crankshaft
tightening will twist or fracture the flared ends
bolt at the front of the engine, do not turn the
of the fuel pipes a n d result in leaks.
crankshaft in a left-hand direction of rotation
Lubricating oil diluted by fuel oil can cause
as the bolt will be loosened. Remove the
serious damage to the engine bearings.
starting motor and use a pry bar against the
teeth of the flywheel ring gear to turn the
crankshaft.
Time the injector, position the injector rack control
lever and adjust the exhaust valve clearance (cold
5. Remove the two rocker shaft bracket bolts and
setting) as outlined in the engine tune-up procedure. If
swing the rocker arm assembly away from the injector
all of the injectors have been replaced, perform a
and valves.
complete tune-up on the engine.
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