CG137-08 and CG137-12 Generator Sets Caterpillar

Cylinder Head

Usage:

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Illustration 1	g02712379

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Illustration 2	g02712380

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Table 1
Specification for 351-1922 Cylinder Head Gp
Item	Qty	Part	Specification Description
Use any one of the following tightening procedure to tighten the bolts for the cylinder head:
Tighten bolt (27) through bolt (39) only after bolt (1) through bolt (26) have been given the final torque.
1	40	236-0484 Bolt	Use the following procedure in order to tighten the bolts for the cylinder head: 1. Before assembly, apply clean engine oil to the threads of the bolts. 2. Tighten bolt 1 through bolt 20 in the numerical sequence as shown in Illustration 2 to 270 ± 27 N·m (200 ± 20 lb ft). 3.Again, tighten bolt 1 through bolt 20 in the numerical sequence as shown in Illustration 2 to 450 ± 20 N·m (332 ± 15 lb ft). 4. Again, retighten bolt 1 through bolt 20 in the numerical sequence as shown in Illustration 2 to 450 ± 20 N·m (332 ± 15 lb ft). 5. Install the rocker arm group. 6. Tighten bolt 21 through bolt 26 in the numerical sequence as shown in Illustration 2 to 270 ± 27 N·m (200 ± 20 lb ft). 7. Again, tighten bolt 21 through bolt 26 in the numerical sequence as shown in Illustration 2 to 450 ± 20 N·m (332 ± 15 lb ft) 8. Again, retighten bolt 21 through bolt 26 in the numerical sequence as shown in Illustration 2 to 450 ± 20 N·m (332 ± 15 lb ft). 9. Tighten bolt 27 through bolt 39 in the numerical sequence as shown in Illustration 2 to 43 ± 7 N·m (32 ± 5 lb ft).
1	12	234-9558 Bolt
2	26	0L-1352 Bolt
Alternate tightening procedure to tighten the bolts for the cylinder head:
-	-	-	Use the following procedure in order to tighten the bolts for the cylinder head: 1. Before assembly, apply molybdenum paste to the threads of the (3/4) bolts. 2. Tighten bolt 1 through bolt 20 in the numerical sequence as shown in Illustration 2 to 270 ± 27 N·m (200 ± 20 lb ft). 3.Again, tighten bolt 1 through bolt 20 in the numerical sequence as shown in Illustration 2 to 390 ± 10 N·m (288 ± 7 lb ft). 4. Again, retighten bolt 1 through bolt 20 in the numerical sequence as shown in Illustration 2 to 390 ± 10 N·m (288 ± 7 lb ft). 5. Install the rocker arm group. 6. Tighten bolt 21 through bolt 26 in the numerical sequence as shown in Illustration 2 to 270 ± 27 N·m (200 ± 20 lb ft). 7. Again, tighten bolt 21 through bolt 26 in the numerical sequence as shown in Illustration 2 to 390 ± 10 N·m (288 ± 7 lb ft) 8. Again, retighten bolt 21 through bolt 26 in the numerical sequence as shown in Illustration 2 to 390 ± 10 N·m (288 ± 7 lb ft). Before assembly, lubricate the threads of the (3/8) bolts with clean engine oil. 9. Tighten bolt 27 through bolt 39 in the numerical sequence as shown in Illustration 2 to 43 ± 7 N·m (32 ± 5 lb ft).
3	2	4N-0932 Cup Plug	Apply, Loctite 11358 sealant to the bores of the cup plugs. Installation depth is 1.25 ± 0.25 mm (0.049 ± 0.010 inch).
4	2	5P-0063 Cup Plug	Apply, Loctite 11358 sealant to the bores of the cup plugs. Installation depth is 1.25 ± 0.25 mm (0.049 ± 0.010 inch).

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Illustration 3	g02712382

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Table 2
Specification for 351-1922 Cylinder Head Gp
Item	Qty	Part	Specification Description
5	6	109-0073 O-Ring Seal	Before assembly, lubricate the bore of the O-ring with silicon compound.
6	6	213-7539 Adapter	Before assembly, apply antiseize to the threads. Torque to 95 ± 7 N·m (70 ± 5 lb ft).
Apply high strength, high temperature anaerobic flange sealant to all the bores of the cup plugs.
7	5	3B-0645 Cup Plug	Installation depth is 2.0 ± 0.5 mm (0.08 ± 0.02 inch).
8	5	3B-0645 Cup Plug	Installation depth is 4.5 ± 0.5 mm (0.18 ± 0.02 inch).
9	12	3B-0623 Cup Plug	Installation depth is 0.8 ± 0.5 mm (0.03 ± 0.02 inch).

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