FUEL SYSTEM
3TNV88F Service Manual
7-25
Fuel Injectors
3. Note the reading on the dial indicator
. If the reading is less than
2.5 mm (0.098 in.), the fuel injection timing is
“retarded”. If the dial indicator reading is greater
than 2.5 mm (0.098 in.), the fuel injection timing
is “advanced.”
Figure 7-42
Note: Some model engines require the intake
manifold and fuel injection pump
insulator be removed to access the inner
fuel injection pump retaining nuts.
4. Loosen the nuts fastening the fuel injection
pump to the gear case or front plate. Loosen
the rear bracket(s) on the fuel injection pump.
Note: Loosening the high-pressure injection
line nuts on the fuel injection pump may
make rotating the pump easier.
5. Rotate the fuel injection pump until the dial
indicator reads 2.5 mm (0.098 in.).
6. To “advance” the injection timing, rotate the top
of the fuel injection pump away from the engine.
7. To “retard” the injection timing, rotate the top of
the fuel injection pump toward the engine.
8. When the dial indicator reads 2.5 mm (0.098
in.) of pump plunger lift and the target timing
mark on the flywheel aligns with the reference
mark on the flywheel housing or engine back
plate, the injection timing is correct.
9. Tighten the fuel injection pump mounting nuts
and rear bracket(s).
10. Remove the dial indicator and adapter. Replace
the plug in the pump plunger opening and
tighten it to specification. If removed, install the
intake manifold and pump insulator. Tighten the
high-pressure injection line nuts to
specification. Open the fuel supply valve,
remove the clamp from the fuel return line and
prime the fuel system. Operate the engine and
check it for leaks.
FUEL INJECTORS
Removal of Fuel Injectors
1. Close any fuel valves in the fuel supply line.
2. Remove the high-pressure fuel injection lines
as an assembly
(Figure 7-43, (1))
.
Figure 7-43
K0002069
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046369-00X00
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