to the oil seal bore. Press or drive seal (19) from the cover.
4-23. Cleaning, Inspection and Repair
Clean all metal parts in cleaning solvent, Federal Specification P-D-680, or equivalent, before inspection.
Inspect oil pump rotor assembly for indications of excessive wear, cracks or pitting. Check rotor drive gear teeth for
wear and cracks.
Inspect front cover for cracks and damage. Replace damaged cover. Inspect pulley and crankshaft bolt for wear.
Replace all seals and gaskets.
Refer to figure 4-13. Coat the bore of the cover housing with non-hardening sealant. Apply grease to the lip of oil
seal (19 Position the seal in the cover with the seal lip pointing toward the inner face of the cover.
Place the cover in an arbor press. Press the seal into the bore until the seal is flush with the outside face of the
cover. Remove all excess sealant.
Coat rotor assembly (18) parts with clean engine oil. Install the assembly in rotor cover (15). Place cover (17) into
position on the rotor cover, and secure with screws (16).
Install the assembled rotor housing into front cover (6) and secure with screws (13) and lock washers (14).
Install regulator valve (12), spring (11), new gasket (10) and plug ). Install plug (8) in cover (6).
Refer to figure 4-13. Affix a new cover gasket (7) to the engine cylinder block.
Install two temporary guide studs in the cylinder block to guide the cover in place without damaging the crankshaft
Apply a light coat of cup grease to the lip of the oil seal. Push the cover into place slowly, until the pump contacts
the drive gear on the crankshaft. Rotate the crankshaft slightly to align the teeth, then push the cover up against the gasket
Remove the pilot studs installed previously.
Install bolts (4) and lock washers (5). Tighten the bolts to 3035 ft-lb (41--47 N m).
Lubricate the end of the shaft and install pulley (3). Install pulley retainer (2) and secure with crankshaft bolt (1).
Tighten the crankshaft bolt to 290300 ft-lb (393--07 N m).
Refer to chapter 4, section VII and install the engine oil pan.
Section VI. REPAIR OF CAMSHAFT AND BALANCE SHAFT
The camshaft and balance shaf are located just below the top of the cylinder block The camshaft is supported by end
bearings and intermediate bearings pressed into the block. The balance shaft is supported by end bearings only. The
shafts are driven from the crankshaft gear, through an idler gear. In turn, the camshaft and balance shaft gears drive the
air blower and governor, in addition to providing the usual function of driving the exhaust valves and fuel injectors.
a Refer to TM 5-3810-295-12 and remove the radiator, hoses, fan, fuel lines, and filters. Refer to paragraph 3-14 and
Refer to chapter 3 and remove engine accessories.
Refer to chapter 2 and remove the engine from the crane.
Refer to chapter 4 and remove cylinder head, upper front cover, flywheel, and flywheel housing.
Refer to figure 4-14. Remove retainer screws (1), lock washers (2) and gear nut retainer plates (3).
Wedge a dean rag between the camshaft gear and the balance shaft gear. Remove nut (4) from each shaft.
(Balance weights, or pulleys, and shaft nuts should have been removed from the front end of the shafts previously as part
of the upper front cover removal procedure.)