3176C and 3196 Marine Engines Caterpillar

Illustration 1	g01430837

(1) Torque for thrust pin ... 28 ± 7 N·m (20 ± 5 lb ft)

(2) Diameter of new camshaft journals ... 74.850 ± 0.025 mm (2.9468 ± 0.0010 inch)

(3) Key

(4) Gear

Illustration 2	g01430848
(B) Height of typical camshaft lobe

To find the lobe lift, use the procedure that follows.

1. Measure the camshaft lobe height (B).

2. Measure the base circle (C).

   1. The base circle for the exhaust lobe measures 55.0 ± 0.4 mm (2.17 ± 0.02 inch).

   2. The base circle for the inlet lobe measures 51.0 ± 0.4 mm (2.01 ± 0.02 inch).

   3. The base circle for the injector lobe measures 51.0 ± 0.4 mm (2.01 ± 0.02 inch).

3. Subtract the base circle (Step 2) from the lobe height (Step 1). The difference is the actual lobe lift (A).

4. Specified camshaft lobe lift (B)

   Exhaust lobe lift ... 9.550 mm (0.3760 inch)

   Lift of the inlet lobe ... 11.371 mm (0.4477 inch)

   Injector lobe lift ... 11.229 mm (0.4421 inch)

Minimum permissible difference between actual lobe lift (Step 3) and the specified lobe lift (Step 4) ... ± 0.13 mm (0.005 inch)