FLYWHEEL AND RING GEAR REPLACEMENT

CRANKSHAFT AND MAIN BEARING MAINTENANCE - cont

TM-5-3825-225-14P Drilling System Well Rotary Truck Mounted Air Transportable 600 Feet Capacity Model LP-12 NSN 3820-01-246-4276 Manual
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TM 5-3825-225-14&P (3) If crankcase pressure is normal and new seals need to be fitted, the following procedures should be adopted with the crankcase in position. (a) Set a half housing in a vise with the seal facing up. (b) Insert approximately 1 in. (2.5 cm) of the strip, at each end, into the ends of the groove ensuring that each end of the strip projects 0.010-0.020 in. (0.25-0.51 mm) beyond the half housing joint face. (c) With the thumb or finger, press the remainder of the strip into the groove, working from the center. Then use any convenient round bar to seat the strip by rolling and pressing its inner diameter (see Figure 5-16). This procedure takes advantage of the friction between the strip and the groove at the ends to compact the rope, while ensuring that the projections of the end faces of the rope remain as set. Figure 5-16. Pressing Seal in Place. (d) Install the sealing strip to the other half housing in a similar manner. (e) Remove all traces of the old joint from the cylinder block rear face and fit a new joint treated with a suitable jointing compound. (f) Lightly coat the faces of the housing with a suitable jointing compound. (g) Spread a film of graphite grease over the exposed inside diameter surface of the strip. (h) Assemble the half housings around the crankshaft rear journal and fasten together with two setscrews (see Figure 5-11). (i) Swivel the complete seal housing on the crankshaft, to seat the strips and to ensure that the assembly turns on the crankshaft. (j) Bolt the seal housing in position on the block and the rear main bearing cap. Tighten the securing setscrews. 5-17. FLYWHEEL AND RING GEAR REPLACEMENT. a. Flywheel and Ring Gear Removal (See Appendix E Figure 53). (1) Remove flywheel assembly (8). NOTE The flywheel ring gear (9) is a shrunk fit on the flywheel (10). It is removed by partially cutting through the gear and chisel cutting it from the flywheel. An alternative method is to apply localized heat to the ring gear to expand It sufficiently to enable it to be tapped evenly from the flywheel. (2) Separate flywheel (10) and ring gear (9). (3) Remove flywheel housing (14). (4) Remove flywheel housing dust cover (19) and preformed packing (1). Discard preformed packing. b Flywheel and Ring Gear Installation (see Appendix E Figure 53). (1) Install new preformed packing (1) and flywheel housing dust cover (19). (2) Attach flywheel housing (14) to engine. (3) Clean locating faces of flywheel (10) to ensure a position location when the new ring gear is fitted. TA506337 5-17

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