Return the fuel pump housing (66) to the oven, and heat it to 300F (149C).
Orient the fuel passages of the new governor barrels (82 and 83) with those of the old governor
barrels, an scribe a match-mark on the new governor barrel to align with the match-mark made in
step 1, above. Put a light coat of anti-seize compound MIL-A-907 on the barrel.
Remove the fuel pump housing (66) from the oven, install the spring pack housings (81 and 84),
align the match-marks, and install the governor barrels (82 and 83) in the fuel pump housing using
an arbor press if necessary.
Check that the hole in the fuel pump housing (66) and lower governor barrel (82) for the governor
barrel dip (62) are aligned. Using lock dip driver 3376136, install the governor barrel dip with the slot
facing the governor end of the fuel pump housing.
Check that the hole in the fuel pump housing (66) and upper governor barrel (83) for the pan head
screw (63) are aligned, and install the pan head screw. Let the fuel pump housing (66) cool, and
remove and reinstall the pan head screw (63) with packing with retainer (64).
Let the fuel pump housing (66) cool, and install the pipe plug (61) using a single wrap of teflon tape
MIL-T-27730 on the pipe plug threads. Tighten the pipe plug to 5 to 8 pound-feet (7 to 11 newton-
Select fit new plungers (73 or 77) in accordance with step (y), below.
Select fit a new plunger (73 or 77) as follows (see Table 6-2).
To avoid damage to the plunger (73 or 77) and governor barrel (82 or 83) follow the fitting
Instructions carefully. The plunger should fit without forcing. The plungers are color coded
and graded as to class of fit
Try a class 2 (green) plunger (73 or 77) for ft in the governor barrel (82 or 83). If the class 2 (green)
plunger fits, try a class 3 (yellow).a
Continue trying larger class plungers (73 or 77) until one is found that will not enter the governor
barrel (82 or 83).
Select a plunger (73 or 77) two classes smaller than the one that would not fit. For example: if a
class 4 (orange) would not enter the bore, select a class 2 (green).
Check to be sure that both the plunger (73 or 77) and governor barrel (82 or 83) mating surfaces are
dean. Dip the plunger in dean calibrating fluid 3375634, start the plunger in the bore, and release it.
The plunger shall drop slowly into the bore of its own weight. If the plunger hangs up, or will not drop
into the lower governor barrel of its own weight, check for the presence of dirt or foreign material,
and recheck the class fit in accordance with steps 1 through 3, above.
Table 6-2. Fuel Pump Governor Plunger Color Code and Class Size