2-35.2. (6.5L) FUEL INJECTION PUMPS (DB2831-5485 OR DB2831-5079) CALIBRATION (Contd)
Energize electric shutoff solenoid and check delivery against the chart below:
Disconnect pump and mount in holding fixture.
Perform step 12 to check pump timing on the DB2831-5079 fuel
Using air timing gauge, check pump timing. Set to 1.5 to 3.5 degrees.
Using air timing gauge, check pump timing. Set to 1.0 +1.0 degrees.
Total throttle travel from low-idle to wide-open throttle should be 75-84 degrees.
Refer to para. 2-7, Engine Troubleshooting, to diagnose any malfunctions encountered during
Roller-to-roller dimension must be 1.975 ± .001 in. (50.19 ± .025 mm). With oversize cam ring
installed, roller-to-roller dimension will be 1.882 ± .005 in. (50.34 ± .013 mm). Maximum eccentricity
allowed is 0.008 in. (0.20 mm) TIR.
Linkage gap must be 0.130-0.175 in. (3.30-4.45 mm).
Mount the pump horizontally in holding fixture and remove governor cover.
Hold the throttle lever in the wide-open throttle (WOT) position. Rotate pump driveshaft
counterclockwise until a click is heard as the rounded contact points on the governor arm engage the
slots in the thrust sleeve. Continue to rotate driveshaft until gap between governor arm and pump
housing is minimal.
Using linkage gap tool, check clearance limits between rear of shutoff shaft and vertical tab on
If adjustment is required, loosen governor linkage hook adjustment screw and extend the linkage
hook to its maximum open length (throttle lever must be in WOT).
Insert appropriate step of linkage gap tool between vertical hook tab and throttle shaft, with step
facing shaft. The tool must be held vertically and parallel to linkage hook tab.
With linkage hook pin seated firmly in governor arm slot and governor arm in the minimal gap
position (step 2.(b)), shorten linkage hook assembly until face of vertical tab is flush against tool.
Tighten adjusting screw to 12-15 lb-in. (1 Nm).
Recheck linkage gap and adjust if necessary.
d. Injection Pump Settings (Following Pump Repair)
0-12 psi (0-83 kPa)
8-12 psi (55-83 kPa)
0-1 psi (0-7 kPa)**
* Maximum cylinder variation should be ± 6 mm3 from the average flow of all cylinders.
** With electric shut-off solenoid de-energized.
*** Reset using low-idle screw.
**** Minimum of 1.25 degrees more than reading.