G3520C and G3520E Engines Caterpillar

Valve Mechanism

Usage:

G3520C B9P

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Illustration 1	g03027276

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Table 1
Specification for 258-5407 Valve Mechanism Gp
Item	Qty	Part	Specification Description
1	2	3J-9196 Jam Nut	Torque to 70 ± 15 N·m (52 ± 11 lb ft).
2	2	9L-7712 Nut	Torque to 30 ± 4 N·m (266 ± 35 lb in).
3	2	7N-1902 Dowel	Diameter is 11.008 ± 0.004 mm (0.4334 ± 0.0002 inch).
			Bore in the valve bridge for the dowel is 11.07 ± 0.03 mm (0.436 ± 0.001 inch).
			Bore in the cylinder head for the dowel is 10.968 ± 0.020 mm (0.4318 ± 0.0008 inch).
4	2	8T-7581 Bolt	Torque to 120 ± 20 N·m (90 ± 15 lb ft).
5	2	7N-4782 Lifter Guide Spring	The two lifter guide springs must not be used again. Always install new lifter guide springs
A	1	201-8290 Shaft As	Diameter is 37.084 ± 0.013 mm (1.4600 ± 0.0005 inch).
A	1	201-8290 Shaft As	Bore in the 201-8300 Bushing for the rocker arm shaft is 37.140 ± 0.015 mm (1.4622 ± 0.0006 inch).
B	-	-	Valve lash for 1200 rpm engines and for 1500 rpm engines: Inlet is 0.38 mm (0.015 inch). Exhaust is 1.12 mm (0.044 inch).
B	-	-	Valve lash for 1800 rpm engines: Inlet is 0.38 mm (0.015 inch). Exhaust is 1.02 mm (0.040 inch).
C	-	-	Height to the top of the dowel is 66.5 ± 0.5 mm (2.62 ± 0.02 inch).
D	2	346-7515 Lifter As	Diameter is 29.900 ± 0.010 mm (1.1772 ± 0.0004 inch).
D	2	346-7515 Lifter As	Bore in the cylinder head for the lifter assembly is 30.000 ± 0.025 mm (1.1811 ± 0.0010 inch).

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