Engine Systems
DETROIT DIESEL
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
Fig. 3 - Removing Injector from Cylinder Head
heads, there is a possibility of
damaging the exhaust valves if the
Remove Injector
exhaust valve bridge is not resting
An injector may be removed in the following manner:
on the ends of the exhaust valves
when tightening the rocker shaft
1. Clean and remove the valve rocker cover.
bracket bolts. Therefore, note the
position of the exhaust valve bridge
2. Disconnect the fuel pipes from both the injector and
before, during and after tightening
the fuel connectors.
the rocker shaft bracket bolts.
3. Immediately after removing the fuel pipes, cover the
Do not tighten the injector clamp bolt to more than 20-25
injector inlet and outlet fittings with shipping caps to
lb.-ft torque, as this may cause the moving parts of the
prevent dirt from entering.
injector Jo bind. Tighten the rocker shaft bolts to 50-55
lb.-ft torque.
4. Turn the crankshaft manually in the direction of
engine rotation or crank the engine with the starting
Align the fuel pipes and connect them to the injector and
motor, if necessary, until the rocker arms for the
the fuel connectors. Us socket J 8932-01 and a torque
particular cylinder are aligned in a horizontal plane.
wrench to tighten the fuel pipe nuts to 12-15 lb. ft
torque.
CAUTION: If a wrench is used on the
crankshaft bolt at the front of the engine,
CAUTION: o not bend the fuel pipes
do not turn the crankshaft in a left-hand
and do not exceed the specified
direction of rotation as the bolt will be
torque.
Excessive tightening will
loosened. Remove the starting motor
twist or fracture the flared ends of
and use a pry bar against the teeth of the
the fuel pipes and result in leaks.
flywheel ring gear to turn the crankshaft.
Lubricating oil diluted by fuel oil can
cause serious damage to the engine
5. Remove the two rocker shaft bracket bolts and swing
the rocker arm assembly away from the injector and
valves.
Time the injector, position the injector rack control lever
and adjust the exhaust valve clearance (cold setting) as
6. Remove the injector clamp bolt, washer and clamp.
outlined in the engine tune-up procedure. If all of the
injectors have been replaced, perform a complete tune-
7. Loosen the inner and outer adjusting screws on the
up on the engine
injector rack control lever and slide the lever away from
the injector.
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