G3520B Engines Caterpillar

Illustration 1	g01434817

(1) Torque for 16 bolts ... 55 ± 7 N·m (41 ± 5 lb ft)

(A) Extension of the dowel from the face of the camshaft assembly ... 12.0 ± 0.5 mm (0.47 ± 0.02 inch)

(C) Dimensions for the bearing journal

Diameter of bearing journal ... 91.880 ± 0.020 mm (3.6173 ± 0.0008 inch)

Bore in bearing for camshaft after assembly ... 92.00 ± 0.06 mm (3.622 ± 0.002 inch)

(D) Dimensions for the thrust washer

Thickness of new thrust washer ... 8.50 ± 0.05 mm (0.335 ± 0.002 inch)

Thickness of groove in new camshaft ... 8.75 ± 0.05 mm (0.344 ± 0.002 inch)

Note: End play for new camshaft assembly is 0.15 to 0.35 mm (0.006 to 0.014 inch).

(E) Extension of the dowel from the end of the rear right hand camshaft and the front left hand camshaft ... 22.0 ± 0.5 mm (0.87 ± 0.02 inch)

Illustration 2	g01347116

(F) Specified camshaft lobe lift

Inlet lobe ... 7.5000 mm (0.29527 inch)

Exhaust lobe ... 8.6992 mm (0.34249 inch)

Use the following procedure in order to determine the actual camshaft lobe lift:

1. Measure camshaft lobe height (G) .

2. Measure base circle (H) .

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