TM 9-2815-225-34&P
3-62. FUEL PUMP MAIN HOUSING REPAIR (Contd)
LOCATION/ITEM
ACTION
REMARKS
c. Inspection and Repair (Contd)
29.
Governor barrel (42)
a. Inspect for wear.
Governor barrel (42) is hardened
and wears very little. If barrel is
worn or if governor plunger
assembly (33) shows signs of
damage, governor barrel (42) and
spring pack housing (41) must be
replaced (refer to step 29b. for
replacement).
b. Replace governor barrel (42)
Do this step only if governor and
and spring pack housing (41)
barrel (42) is worn or damaged.
as follows:
(1) Remove roll pin (39).
Using a wire hook, pull roll pin
(39) out through plug hole in
bottom of housing (38).
(2) Heat housing (38) in oven to
This will permit governor barrel
300F (149C).
(42) to be pressed out with less
damage to housing bore.
(3) Press out of housing (38).
Discard housing (38) if bore is not
at least 0.002 in. (0.051 mm)
smaller than governor barrel (42)
outside diameter.
(4) Using suitable governor barrel
(42) outside micrometer, measure
barrel diameter of bore in housing
(38) and outside diameter of a new
governor barrel (42).
(5) Check bore of housing (38)
Remove slight score marks with
for score marks.
crocus cloth. Discard housing (38)
if deeply scored.
NOTE
Steps 29b.(6) and 29b.(7) refer to M915/Big Cam I older-style fuel pumps only.
(6) If governor barrel (42) is
Heat will expand aluminum
worn or shows signs of scoring,
housing and permit steel
heat the housing (38) in an oven
barrel to be pressed out with less
to 300F (149 C) and press out
chance of damaging housing
governor barrel (42).
bore.
NOTE
Check through-plug hole in bottom of pump for spring dowel which secures barrel in fuel
pumps before attempting to remove governor barrel. Sometimes a wire hook, inserted into
hole provided, will pull the spring dowel.
(7) Check barrel bore in
Check the bore for score marks;
housing (38) to determine whether
remove marks if found.
standard and 1.5020-1.5025 in.
(38.15-38.16 mm) or 0.020 in.
(0.51 mm) oversize must be used.
Minimum 0.002 in. (0.05 mm)
interference fit is required.
3-432
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