Using two dial indicators, check run-out at 45 angles (8 readings) on the flywheel housing. The maximum total
readings may not exceed 0.013 inch for either the bore or the face.
If run-out exceeds limit, remove the flywheel housing and check for dirt or foreign particles between the flywheel
housing and the rear end plate.
Install cove (15) and (16), and gasket (17), and secure with screws (10) and (11), flat washers (13) and (14) and
lock washers (12).
Install access covers (8) and gasket (9). Secure with screws ) and lock washers (7).
Support the flywheel, ring gear side up, on a solid flat surface.
Rest the ring gear on a flat metal surface. Heat the gear uniformly with an acetylene torch, keeping the torch
moving around the gear to avoid hot spots.
Do not heat the ring gear over 400'F. Excessive heating may destroy the original heat treatment.
Using a pair of tongs, place ring gear (5) on flywheel (3) with the chamfer facing the same direction it did originally.
Tap the gear in place against the shoulder of the flywheel. If the gear does not readily tap into place, remove and
reheat the ring gear.
Using a suitable lifting device, position the flywheel on the crank shaft.
Install retaining plate (2) and secure with screws (1) Tighten the screws to 110--120 ft-lb (149-163 N m).
Mount a dial indicator on the flywheel housing and check the run-out of the flywheel. Maximum allowable run-out is
Refer paragraph 2-13 and install the reduction gear.
Section IV. REPAIR OF UPPER FRONT COVER
The upper front cover is mounted against the cylinder block at the front upper end of the engine. The camshaft and
balance shaft oil seals a pressed into the cover.
4-17. Removal and Disassembly
Refer to TM 5-3810-295-12 and remove engine fan.
Remove flywheel housing as outlined in chapter 4, section III.
Wedge a clean rag between the cam and balance weights (gears) at the ear of the engine to prevent rotation of the
camshaft and balance shaft.
Refer to figure 4-12 and move nuts (1). Force the balance weight (2) off the end of each shaft
Remove cover attaching screws ) and (4), and lock washers (5). Gently tap the cover and remove cover (6), dowel
(7) and gasket (8). Remove Woodruff key (9).
Remove oil seal (10).
4-18. Cleaning, Inspection and Repair
Clean all metal parts in cleaning solvent, Federal Specification P-D-680or equivalent, before inspection.
Replace seals and gaskets.
Inspect cover for cracks or damage. Replace damaged cover.