G3406 Engines Caterpillar

Illustration 1	g00746454

(1) Maximum permissible temperature of the gear for installation on the camshaft ... 315 °C (600 °F)

Note: Do not use a torch to heat the gear.

(2) Diameter of the surfaces (journals) for the new camshaft bearing ... 69.850 ± 0.013 mm (2.7500 ± 0.0005 inch)

Bore in front bearing for the camshaft after assembly ... 69.969 ± 0.048 mm (2.7547 ± 0.0019 inch)

Bore in the other six bearings for the camshaft after assembly ... 69.982 ± 0.061 mm (2.7552 ± 0.0024 inch)

(3) Interference fit between the gear and camshaft ... 0.037 to 0.123 mm (0.0015 to 0.0048 inch)

(4) Thickness of new thrust plate 4.65 ± 0.03 mm (0.183 ± 0.001 inch)

End play of the camshaft ... 0.010 to 0.260 mm (0.004 to 0.010 inch)

Illustration 2	g00746455

(5) Height of camshaft lobe

(6) Camshaft lobe lift

Exhaust lobe ... 8.900 mm (0.3504 inch)

Inlet lobe ... 8.900 mm (0.3504 inch)

Use the following procedure to find the camshaft lobe lift.

1. Measure the camshaft lobe height (5) .

2. Measure the base circle (7) .

3. Subtract the base circle from the camshaft lobe height. The difference is actual lobe lift (6) .

Maximum permissible difference between actual lobe lift and the specified lobe lift of a new camshaft ... 0.13 mm (0.005 inch)