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REPAIR INSTRUCTIONS, PART 1
285
Figure 285 — Unit Injector Retainer
The engine may be equipped with 28 mm high
yokes or 38 mm high injector hold-down yokes.
Make sure that the new replacement yoke screws
are of the correct length for the injector hold-down
yokes being used. Using screws of improper
length may result in insufficient thread
engagement and damage to the cylinder head
threads during tightening.
10. Make sure that the injector is reinstalled to
the same cylinder from which it was
removed (or injector trim codes will need to
be reprogrammed in the EECU).
11. Center the unit injector between the valve
springs and then push down on the unit
injector using hand pressure to seat the
O-rings. Hand tighten the new hold-down
screw.
앫 The unit injector hold-down bolt must be
replaced whenever it is removed from the
hold-down and cylinder head.
앫 Before installing, the yoke screw must be
cleaned and a light coat of oil applied to the
threads and to the underside of the screw
head.
12. Plug in the injector electrical connector,
making sure it is central between the valve
springs with equal space on both sides.
286
Figure 286 — Electrical Connector for Unit Injector
13. Using a torque wrench, tighten the
hold-down screw in stages according to
specification.
The yoke screw tightening specification varies
dependent on if the assembly utilizes an injector
sealing gasket/washer or no washer.
14. When replacing unit injectors, the control
unit must be programmed with the new
injector's trim codes. The code is printed on
top of the unit injector electrical connector.
The programming is performed using
VCADS and is necessary to ensure that
engine timing and emission levels are
correct.
287
Figure 287 — Injector Trim Codes
1. Injector Hold-Down Yoke 2. Unit Injector
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