TIMING GEARS AND CRANKSHAFT MAINTENANCE

PISTONS AND CONNECTING RODS REPLACEMENT - cont - TM-5-3825-225-14P_115

TIMING GEARS AND CRANKSHAFT MAINTENANCE - cont - TM-5-3825-225-14P_117

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 NOTE The limits for sleeve protrusion are 0.023-0.027 In. (0.584-0.686 mm) and may be checked as shown In Figure 5-27. Figure 5-27. Piston Clearance. (6) The sleeve (6) must protrude above the cylinder block top face and not be pressed fully home when fitted correctly. Use a solid stop washer designed to give the correct sleeve protrusion. (7) Press the sleeve into the bore progressively until it reaches the solid stop washer. NOTE Where boring equipment is mounted on the top face of the cylinder block, a parallel plate thicker than 0.027 in. (0.686 mm) should be fitted between the boring bar and cylinder block face. (8) Bore and finish hone the sleeves to 3.125-3.126 in. (79.375-79.400 mm). (9) Assemble the engine components to the cylinder block. 5-19. TIMING GEARS AND CRANKSHAFT MAINTENANCE. a. Timing Case Cover Removal (See Appendix E Figure 52, 58, and 77). (1) Loosen alternator mounting bolts (1 and 15, Appendix F, Figure 77) and adjusting bolts (9) and tilt generator (8) toward engine. (2) Remove fan belt. (3) Remove crankshaft pulley setscrew, crankshaft pulley (8, Appendix F, Figure 52), and key (6). CAUTION Be careful not to damage the crankshaft front oil seal. (4) Remove timing case cover setscrews (24, Appendix F, Figure 58) and timing gear cover (16). (5) Remove gasket (20) and discard. b. Crankshaft Front Oil Seal Replacement (See Appendix E Figure 58). (1) Press oil seal (28) from timing case cover (16). Discard oil seal. (2) Press new oil seal (28) with lip facing inward, into the timing case cover (16) until seated against seal retaining lip. Ensure that cover is supported as the seal is pressed into it. c. Timing Case Cover Installation (See Appendix F, Figures 52 and 58). (1) Using a new gasket (20, Appendix F, Figure 58) lightly coated with a suitable jointing compound, place the timing case cover (16) in position, taking care not to damage the rubber tip of the oil seal (28) on the crankshaft pulley key (6, Appendix F, Figure 52). (2) Loosely install the timing case cover setscrews and nuts. (3) Install the crankshaft pulley (8) to centralize the oil seal, then tighten the securing setscrews and nuts. (4) Install the crankshaft pulley setscrew and torque to 150 lb.-ft. (203.4 N m). (5) Install the fan belt and adjust fan belt tension (see paragraph 4-51). d. Idler Gear and Hub Removal (See Appendix E Figure 56 and 58). (1) Remove the timing case cover (see a above). TA506344 5-24

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