3408C & 3412C INDUSTRIAL ENGINES Caterpillar

3412

(1) Torque for bushing ... 163 ± 14 N·m (120 ± 10 lb ft)

(2) Springs:

8N1415 Spring (Outer):

Length under test force ... 8.69 mm (.342 in)

Test force ... 111 ± 6 N (25 ± 1 lb)

Free length after test ... 12.12 mm (.477 in)

Outside diameter ... 9.78 mm (.385 in)

1W6985 Spring (Inner)

Length under test force ... 7.63 mm (.300 in)

Test force ... 8.3 ± 0.8 N (1.87 ± .18 lb)

Free length after test ... 8.54 mm (.336 in)

Outside diameter ... 3.2 mm (.13 in)

(3) Thickness of spacers:

9N6496 Spacer ... 4.12 mm (.162 in)

9N6495 Spacer ... 4.22 mm (.166 in)

5M2697 Spacer ... 4.32 mm (.170 in)

2M4208 Spacer ... 4.42 mm (.174 in)

2M4209 Spacer ... 4.52 mm (.178 in)

2M4210 Spacer ... 4.62 mm (.182 in)

2M4211 Spacer ... 4.72 mm (.186 in)

2M4212 Spacer ... 4.83 mm (.190 in)

5M2691 Spacer ... 4.93 mm (.194 in)

5S7189 Spacer ... 5.03 mm (.198 in)

(4) 7N1208 Lifter Spring:

Length under test force ... 29.26 mm (1.152 in)

Test Force ... 325 ± 16 N (73.0 ± 3.6 lb)

Free length after test ... 48.03 mm (1.891 in)

Outside diameter ... 25.27 mm (.995 in)

(5) Length of pump plunger (7W0561 Pump Group) (new) ... 69.118 ± 0.013 mm (2.7212 ± .0005 in)

Minimum permissible length (worn) ... 69.080 mm (2.7197 in)

(6) Bores for the racks:

Bore in housing, at the rear (new) ... 12.758 ± 0.038 mm (.5023 ± .0015 in)

Bearing at the front (new) ... 12.758 ± 0.046 mm (.5023 ± .0018 in)

Diameter of fuel racks (new) ... 12.662 ± 0.005 mm (.4985 ± .0002 in)

Maximum permissible clearance between rack and bearings (worn) ... 0.18 mm (.007 in)

(7) Bore in bearings for the camshaft (new) ... 53.988 ± 0.038 mm (2.1255 ± .0005 in)

Diameter of bearing surfaces of the camshaft (new) ... 53.899 ± 0.013 mm (2.1220 ± .0005 in)

Maximum permissible clearance between the bearings and the camshaft ... 0.25 mm (.010 in)

5P4158 Gauge

(8) On engine timing dimension for the fuel injection pumps, with 5P4158 Gauge (A):

3408

4W0150 Pump Group ... 106.88 ± 0.05 mm (4.208 ± .002 in)

3412

7E4862 Pump Group ... 106.49 ± 0.05 mm (4.193 ± .002 in)

4W8680 Pump Group ... 106.88 ± 0.05 mm (4.208 ± .002 in)

129-1354 Pump Group ... 105.71 ± 0.05 mm (4.162 ± .002 in)

NOTE: Use spacer as required to obtain dimension (8).

(9) Tighten valve assembly to a torque of ... 70 ± 14 N·m (51 ± 10 lb ft)