Lubricate the capscrews (1) and lockplate (2) with clean lubricating oil, MIL-L-2104, and install the six
washers and capscrews through the crankshaft pulley and vibration damper. Run the screws down
alternately and evenly so that damper and pulley are pulled evenly into contact with the crankshaft.
Remove the guide studs and install the two remaining washers (2) and capscrews (1). Tighten all
capscrews in accordance with the sequence and steps given in Figure 9-60.
Check eccentricity and runout of the vibration damper (4) and crankshaft pulley (3) in accordance with the
Operator and Organizational Maintenance Manual. If runout or eccentricity is excessive, check for foreign
material trapped between the mating surfaces of the crankshaft, damper, and pulley.
9-33. FRONT AND REAR CRANKSHAFT AND ACCESSORY DRIVE SEALS REPLACEMENT.
Front Crankshaft Seal.
Remove the vibration damper (4, Figure 9-59) in accordance with paragraph 9-32.
Using the drill pilot 3375497, and the plate from oil seal puller/installer 3375786, drill three #31 (0.120 inch)
holes in the front crankshaft seal (6) to fit the self-tapping puller screws.
Install the puller screws through the plate of 3375786, and thread them into the drilled holes in the seal (6).
Turn the center screws of 3375786 to remove the seal.
Using dean shop towels, wipe out the seal recess in the cover, and remove all oil from the crankshaft.
Inspect the crankshaft at the seal lip area. If the crankshaft is grooved. Install a wear sleeve in
accordance with paragraph 9-28.
To avoid premature wear of the seal, do not use oil or any other lubricant on LDLTFE (Lay
Down Lip-Teflon) seals or the crankshaft. The seal lip and crankshaft must be clean and free
of all lubricants.
LDL-TFE oil seals include an assembly sleeve pre-assembled into the seal lip. Do not remove
the assembly sleeve before installation.
Apply a light coat of sealing compound, MIL-S-451 80, to the outer diameter of the seal (Figure 9-61).
Position the large diameter of the assembly sleeve over the crankshaft. Using the body 3375786, push the
seal off of the assembly sleeve and onto the crankshaft (Figure 9-61). Remove and discard the assembly
Complete the front crankshaft seal (6, Figure 9-59) installation using the oil seal puller/installer 3375786.
Install the vibration damper (4) in accordance with paragraph 9-32.
Accessory Drive Seals.
Remove the accessory drive pulley (7, Figure 9-59) using a standard puller ST-647, or equivalent.
Remove the accessory drive pulley (9), using puller NSN 5120-516-3120, or equivalent.
Remove the accessory drive seals (8) using a standard claw-type seal puller.
Using clean shop towels, wipe out the seal recess in the cover, and remove all oil from the pulley hub.
Inspect the pulley hub for wear or grooving caused by the seal lip.
If the pulley hub is damaged, install a wear sleeve, part number 190397, on the pulley hub.