AIR COMPRESSOR 8C5049 - Caterpillar

3306/B (4WB, 7JB, 23C, 66D, 70R, 5GZ, 64Z) Industrial, 3306/B (7MF, 67D, 9SL, 1RS, 84Z) Marine;
3306/B (2ZC, 5JC, 7KF, 1DG, 3RG, 2TM, 9NR, 9DS, 85Z) Generator Set EnginesDescription of Change: A new valve cover seal replaces the former cork valve cover gasket in all 3306 Commercial Engines. The new seal will provide improved sealing and may be reused up to three times.
Illustration 1.
Valve Mechanism Cover Group Components. Valve cover (1).9M-1974 Washer (2).133-1247 Seal (3).0S-1617 Bolt (4). Adaptable To: The new 133-1247 Valve Cover Seal replaces the former 8S-1605 Valve Cover Gasket in the above 3306 Commercial Engines. The new valve cover seal is effective with 3306 (2AJ1199, 8JJ403, 1RS554, 9NR2415, 7Y6324, 1CZ399, 64Z24959, 84Z3051, 85Z14204) Commercial Engines. If a new seal is installed in place of a former gasket, the fifteen 3B-4505 Lockwashers under the heads of the fifteen bolts that fasten the valve cover to the cylinder head must be replaced with fifteen 9M-1974 Washers. When the new 133-1247 Valve Cover Seal is used, tighten the fifteen 0S-1617 Bolts (that fasten the valve cover to the cylinder head) in number sequence (see Illustration 2) to a torque of 16 3 N m (142 27 lb in). When the former 8S-1605 Valve Cover Gasket was used, the fifteen bolts were tightened in number sequence (see Illustration 2) to a torque of 11 3 N m (98 27 lb in).
Illustration 2.
Valve cover bolt tightening sequence.