C7 Engines for Caterpillar Built Machines Caterpillar


Valve Mechanism

Usage:

525C 525


Illustration 1g02527116
Front view

Table 1
Specification for 232-3717 Valve Mechanism Gp 
Item  Qty  Part  Specification Description 
256-3832 Rocker Arm As  Bore in the rocker arm assembly for rocker arm shaft 21.548 ± 0.013 mm (0.8483 ± 0.0005 inch)
Apply 8T-2998 Lubricant to the sockets of the rocker arms.
1 256-3835 Rocker Arm As  Bore in the rocker arm for the rocker arm assembly 21.548 ± 0.013 mm (0.8483 ± 0.0005 inch)
Apply 8T-2998 Lubricant to the sockets of the rocker arms.
138-7198 Shaft As  Diameter is 21.500 ± 0.013 mm (0.8465 ± 0.0005 inch) 
2Y-5829 Nut  Torque to 30 ± 7 N·m (266 ± 62 lb in)
7E-6793 Injection Lifter Arm  Bore in the injection lifter arm for the lifter shaft assembly 15.670 ± 0.013 mm (0.6169 ± 0.0005 inch)
139-9476 Lifter Shaft Assembly  Diameter is 15.620 ± 0.018 mm (0.6150 ± 0.0007 inch)
The valve lifter groups must be installed with the oil holes in the lifter shaft, as shown. The oil holes should face toward the side cover of the engine block. 
12  8T-8442 Bolt  Apply blue Loctite 242 to the threads. Tighten the bolts in a numerical sequence that is shown in Illustration 1 for each valve lifter group. 
Torque to 13 ± 3 N·m (115 ± 27 lb in)
Dimensions for the valve lash:
1. Valve lash for inlet is 0.38 ± 0.08 mm (0.015 ± 0.003 inch).
2. Valve lash for exhaust is 0.64 ± 0.08 mm (0.025 ± 0.003 inch) 
5B-1866 Cup Plug  Installation depth is 1.25 ± 0.25 mm (0.049 ± 0.010 inch)


Illustration 2g02527317
Right side view

Table 2
Item  Qty  Part  Specification Description 
137-6717 Spring  Length under test force 30 mm (1.2 inch).
Test force is 63.4 ± 6.3 N (14.3 ± 1.4 lb).
Approximate free length is 50.8 mm (2.00 inch)
8T-0100 Bolt  Tighten the bolts in a numerical sequence that is shown in Illustration 2. 
11  6V-5696 Bolt 

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