COVER 6A6490 - Caterpillar

start by:a) remove fuel injection pump housing, governor and governor drive as a unitb) remove flywheel housingc) remove vibration damper (D399 only)1. Loosen the adjustment screws for valves to get maximum clearance.2. Remove the push rods. 3. Disconnect the oil lines (1) from lifter brackets (3).4. Use a magnet and pull the lifters (2) up enough to put rubber bands or wire on them. This will hold lifters away from camshaft.5. Remove housing for vibration damper, if so equipped. Remove power takeoff, if so equipped. 6. Remove the service meter and tachometer drive from front of engine. Install the alignment tool (A). 7. Remove the large camshaft gear (4). Remove the bolts and locks that hold thrust washer (5).8. If small camshaft gear (6) is to be removed, bend the lock and remove the two bolts and plate from the end of the camshaft.
TOOLS (B) FOR REMOVING SMALL CAMSHAFT GEAR9. Use tools (B) to remove the small camshaft gear (6) from the camshaft.10. Remove the camshaft. Weight of the camshaft is approximately: D379 Engine ... 60 lb.(27 kg)D398 Engine ... 85 lb.(39 kg)D399 Engine ... 100 lb.(45 kg)Install Camshaft
1. Put key and small camshaft gear on the camshaft. Put clean engine oil on camshaft bearing journals. Put 2P2506 Anti-Seize Compound on the camshaft lobes and cam follower face of the valve lifters. On SAE standard rotation engines, (counterclockwise as viewed from flywheel end) install the small camshaft gear on the end opposite the F-mark on camshaft. For SAE opposite rotation engines (clockwise as viewed from flywheel end) install this gear on end with the F-mark.2. Install the plate, lock, and bolts that hold small gear on camshaft. Tighten bolts to 60 to 70 lb. ft. (80 to 95 N m). Install alignment tool (A) on end of camshaft. Install camshaft in engine.3. Install the thrust washer, locks, and bolts that hold small camshaft gear in cylinder block. Be sure the crankshaft is in position with No. 1 piston at top center on compression stroke. 4. Put a mark with chalk on "C" mark of gear (2) and tooth of crankshaft gear with punch marks. Put a mark on back of gears so they can be checked with a mirror after installation. Put the large gear (1) on small camshaft gear. Be sure "C" mark and punch mark of crankshaft gear are in alignment. On D379, move gear (1) out enough to turn balancer gear to make "A" marks in alignment.5. Remove the alignment tool (A) from front of camshaft. Install the service meter and tachometer drive. 6. Remove rubber bands or wires from lifters. Install the push rods (4). Connect the oil lines (3) for rocker shaft assemblies.7. Make adjustment of valve clearance. The cold clearance must be: intake .015 in. (0.38 mm) and exhaust .035 in. (0.89 mm). See VALVE CLEARANCE ADJUSTMENT in TESTING AND ADJUSTING.end by:a) install flywheel housingb) install fuel injection pump housing, governor and governor drive as a unitc) install vibration damper (D399 only)