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6.2L and 6.5L Diesel Engines
See Figures 6 and 7
FIG : Fig. 6: Timing mark alignment-6.2L and 6.5L engines
FIG : Fig. 7: Timing chain installation-6.2L and 6.5L engines
See Figures 1, 2 and 3
Fig. Fig. 1: Accelerator cable linkage
Fig. Fig. 2: Rotate the crankshaft so that the injection pump drive gear bolts become visible through the hole
FIG : Fig. 3: Injection pump mounting
Make sure the locating pin on the pump hub goes into the slotted hole on the driven gear and not the hole in the gear.
See Figures 4, 5 and 6
Special tool J-26987, or its equivalent, will be necessary for this procedure.
For the engine to be properly timed, the lines on the top of the injection pump adapter and the flange of the injection pump must be aligned.
FIG : Fig. 4: Injection pump locating pin-1988-94 models
FIG : Fig. 5: Injection pump timing alignment marks-1988-94 models
FIG : Fig. 6: Slot in the injection pump-1988-94 models
The use of a suitable scan tool is required to check or adjust the injection timing.
The actual injection time on the scan tool will fluctuate. The average reading should be 3.5 degrees.
If the engine stalls during time set activation, slightly rotate the injection pump (1mm = 2degrres) towards the drivers side of the vehicle, tighten the flange nuts and repeat time set.
It is normal for the actual injection time shown on the scan tool screen to fluctuate. Average fluctuation should be 3.5 degrees.