COVER 6A6492 - Caterpillar

start by:a) remove flywheel housing1. Be sure the No. 1 piston is at top center on the compression stroke. See TIMING THE CAMSHAFT FOR THE FUEL INJECTION PUMPS in TESTING AND ADJUSTING. 2. Remove the pins, bolts (1) and locks that hold large camshaft gear to small camshaft gear. Remove the large camshaft gear (2).
Do not turn the crankshaft with large camshaft gear removed and the camshaft installed.
3. Remove bolts and locks that hold thrust washer to the cylinder block. Remove thrust washer. Remove bolts and retainer. 4. Use tooling (B) to remove the small camshaft gear (3) from camshaft.5. On D379 only, remove the thrower (5) with tooling (A). Remove bolts, lock and retainer that hold balancer gear on its shaft. Remove rear balancer gear (4). Remove bearing from balancer gear.Install Rear Timing Gears
1. On D379 only, use tooling (A) to install the bearing in balancer gear. Be sure No. 1 piston is at top center on the compression stroke. See TIMING THE CAMSHAFT FOR THE FUEL INJECTION PUMPS in TESTING AND ADJUSTING. 2. Install small camshaft gear (2), thrust washer (3), lock and bolts. Install retainer (6). Tighten bolts (1) to a torque of 60 to 70 lb. ft. (80 to 95 N m). 3. Put a mark with chalk on the camshaft gear at the location of timing mark "C". Put a mark with chalk on the tooth of crankshaft gear with punch marks. The back of gears can be marked so the marks can be seen with a mirror (7) after installation.4. Install the large camshaft gear (5). Be sure the "C" mark on gear is in alignment with punch mark on crankshaft gear. On D379 only, move large camshaft gear out enough to turn the balancer gear until "A" marks are in alignment.5. Put large camshaft gear in position on the dowel on small camshaft gear. Install locks, bolts, and pin (4). 6. On D379, heat the thrower in oil to a maximum temperature of 410°F (204°C). Install thrower on crankshaft. Use tooling (B) to install thrower in correct location on crankshaft.
Do not use an old oil thrower, seal ring or spring.