C15 On-Highway Engine Caterpillar

Note: Before installation of the camshaft, ensure that the camshaft and the camshaft bearings are clean. lubricate the camshaft lobes with a 50/50 mixture of 8T-2998 Lubricant and clean engine oil. Apply a thin coat of clean engine oil on the camshaft bearings.

Illustration 1	g01525229
(1) Exhaust lobe (2) Injector lobe (3) Inlet lobe (4) Front of camshaft

(A) Diameter of camshaft journals ... 84.85 mm (3.341 inch)

Illustration 2	g01525234

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

1. Measure the camshaft lobe height (C) .

2. Measure the base circle (D) .

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

(B) Specified camshaft lobe lift

Exhaust lobe ... 8.515 mm (0.3352 inch)

Injector lobe ... 10.906 mm (0.4294 inch)

Inlet lobe ... 9.625 mm (0.3789 inch)

The maximum permissible difference between the actual lobe lift in Step 3 and the specified lobe lift is 0.13 mm (0.005 inch).