TRUCK SERVICE MANAUL
FUEL SYSTEM
Note: Check through plug hole In bottom of PT (type G)
pump for spring dowel which secures barrel In fuel
pumps built after May 1963, before attempting to remove
governor barrel. Sometimes a wire hook, Inserted into
the hole provided, will pull the spring dowel. Fig. 5-18.
2. Check barrel bore in housing to determine whether
standard (1.5020 to 1 5025 inch [38.15 to 38 16 mm]
O.D.) barrel, 0.010 inch [0.25 mm] or 0.020 Inch [0.51
mm] oversize must be used. Minimum 0002 inch [0.05
mm] interference fit is required. Check bore for score
marks, remove If found.
Fig. 5-17, F514. Reaming drive shaft bushing with ST-
Assembly And Fitting
490
1. To locate a new governor barrel in the housing,
scribe a center line on barrel and housing, lining up the
fuel passages so fuel flow will not be restricted. Fig. 5.19
Governor Barrel, Plunger And Spring Pack Housing
and 5-20.
Inspection
1. Check governor barrel and plunger visually for wear.
2. If worn, replace governor plunger with a new plunger
of same class size as etched on face of governor barrel
Note: Due to hardness of governor barrel sleeve, it
wears very little. If worn excessively or if plunger shows
signs of scoring, barrel should be replaced.
Standard Governor Barrel Replacement
1. If governor barrel is worn or shows signs of scoring,
it will be necessary to heat housing in oven to 30 deg. F
Fig. 5-19, F516. Scribe center line on governor barrel
[149 deg. C) and press out governor barrel. Heat will
expand the aluminum housing and permit the steel barrel
to be pressed out with less chance of damaging housing
bore.
Fig. 5-20, F5136. Scribe center line on fuel pump
housing
2. Heat housing in oven to 300 deg. F [149 deg C].
Fig. 5-18, F5135. Removing locking pin from bottom of
barrel
3. Coat new governor barrel with high pressure
lubricant. Drop spring pack housing In place.
500
