ENGINE AR-PRIMARY 1745998 - Caterpillar

Illustration 1 g00270500
Illustration 2 g00270546
G3408 Engine
Illustration 3 g00584124
G3412 Engine (1) Bore in rocker arm for new shaft ... 24.803 0.013 mm (0.9765 0.0005 inch) (2) Put 4C-5593 Anti-Seize Compound on the threads of all bolts that hold the rocker arm shaft. Tighten the bolts in the following step sequence.
Tighten bolts according to the number sequence to the following torque.Torque for bolts ... 270 25 N m (200 20 lb ft)
Tighten bolts according to the number sequence to the following torque.Torque for bolts ... 447 20 N m (330 15 lb ft)
Tighten bolts according to the number sequence to the following torque.Torque for bolts ... 447 20 N m (330 15 lb ft) (3) Torque for locknut for the valve adjustment screw ... 28 4 N m (22 3 lb ft) (4) Torque for locknut for the bridge adjustment screw ... 28 4 N m (22 3 lb ft) (5) Valve lashInlet valves ... 0.38 .10 mm (0.015 0.004 inch)Exhaust valves ... 1.02 .10 mm (0.040 0.0040 inch) (6) Height to top of dowel ... 53.3 0.5 mm (2.10 0.02 inch) (7) Diameter of new dowel ... 11.008 0.003 mm (0.4334 0.0001 inch)Bore in bridge for new dowel ... 11.15 0.05 mm (0.438 0.002 inch)Bore in head for dowel ... 10.968 0.020 mm (0.4318 0.0008 inch) (8) Diameter of new valve lifter ... 27.896 0.013 mm (1.0983 0.0005 inch)Bore in block for new valve lifter ... 27.953 0.019 mm (1.1005 0.0007 inch) (9) Guide springs must not be used again. Always install new guide springs.
Illustration 4 g00270548
(10) SpringLength under test force ... 74.2 mm (2.92 inch)Test force ... 45 to 53 N (10 to 12 lb)Free length after test ... 114.3 mm (4.50 inch)Outside diameter ... 29.7 mm (1.17 inch) (11) Dowel length above top surface of rocker shaft support for both ends ... 12.7 1.00 mm (0.50 0.04 inch) (12) Clearance for rocker arms for both ends ... 0.30 to 1.40 mm (0.012 to 0.055 inch) (13) If necessary, use the 2N-7228 Washer in order to get clearance (12) .