Quantcast c.  Inspection and Repair (Contd) - TM-9-2815-225-34P_463

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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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