TM 5-3810-289-34
drop freely of own weight into barrel.
provided figure 3-67.
Note. If fitting oversize plunger to worn barrel or if
(1) Remove the 1/8 in. N.P.T.F. pipe plug
new plunger does not drop freely into new barrel it will be
from opposite end of housing so a 0.339 inch diameter
necessary to lap the plunger to the barrel. Do not over
rod may be inserted to press out the governor barrel.
do this operation. Too much clearance increases throttle
Heat housing and barrel assembly in 'boiling water for 1
leakage and results in slow deceleration.
1/2-2 minutes or in an oven at 3250-3500F. Press barrel
(2) Install new 0-ring (15, fig. 3-64) on
from housings
throttle shaft (19) and insert shaft in cover (10) through
(2) After removing the governor barrel, the
throttle stop (20) with set screw (18).
aluminum governor barrel housing bore should be
(3) Slide plunger housing into plate and
visually inspected for cracks, pits, scores, or other
place assembly up against the governor barrel (3). If
defects. In the event such defects are found, the
housing is loose in plate, add shims between housing
housing should be discarded.
and governor barrel until housing is tight and plate is
(3)
Check barrel bore in housing to
spaced .003/.005 inch from barrel and sleeve assembly.
determine whether standard (1.5020/1.5015 O.D.) barrel,
Retain remainder of shims until later in calibration.
0.010 inch or 0.020 inch oversize must be used.
(4) Install large snap ring (24) in groove
Minimum 0.001 inch interference fit is required. Check
inside plunger housing.
bore for score marks, remove if found.
(5) Install 0.030 inch of shims into housing
from flange end so they seat on snap ring.
Note. Too few shims will result in stalling or too
little throttle leakage. Too many shims will cause slow
deceleration or excessive throttle leakage; therefore, the
number of shims may vary from the 0.030 inch total
specified after engine is started, although experience
indicates 0.030 inch is correct in most cases.
(6) Slide plunger (22), spring (25) and shims
(30, 31, 32) (usually about 0.100 inch of shim) into
housing (12) from rear end.
(7) Slip spring and guide into plunger.
(8) Place gasket (2) over cover (10) and
position plate (27) on gasket.
(9) Carefully slide housing with springs and
plungers in plate.
(10) Install Oaring (26) into plate groove;
add shims as determined in step (3) above, and tighten
Figure 3-66. Governor plunger being lapped to burrel.
spring pack assembly to housing with capscrews,
lockwashers and flatwashers.
i. Installation. Refer to paragraph 3-2.
3-10. Governor Barrel
a. Inspection.
(1) Check governor barrel and plunger
visually for wear.
(2) If worn, replace governor plunger with a
one or two class larger plunger and lap to fit with No. 80
fine grit lapping compound, figure 3-66. Remove all
lapping compound from parts (flush thoroughly).
Note. Plunger must drop into barrel of its own
weight. Proper fit can best be judged by comparison with
a new assembly.
b. Removal.
Note. If governor barrel is worn too large for a
Class 7 governor plunger on PT (type G) pumps it will be
*necessary to replace the governor barrel.
Caution: Check through plug hole in bottom of
Figure 3-67. Locking clip being removed from bottom of
PT (type G) pump for spring dowel which secure
fuel pump housing.
barrel before attempting to remove governor barrel.
To pull spring dowel, insert wire hook into hole
3-24
