3024C Engine for Caterpillar Built Machines Caterpillar

Illustration 1	g00459336
Camshaft gear and bearings

(1) Key for shaft and gear

(2) Camshaft

(3) Bearing

(4) Spacers

(5) Gear for tachometer

(6) Spacer

(7) Camshaft gear with governor

(8) Hub

Note: For information on the backlash of the camshaft gear, refer to Specifications, "Gear Group (Front)".

Lifters

Diameter of the lifters ... 17.960 mm to 17.980 mm (0.70709 inch to 0.70787 inch)

Diameter of the bore in the cylinder block for the lifters ... 18.000 mm to 18.018 mm (0.70866 inch to 0.70937 inch)

Maximum clearance between the lifters and the cylinder block ... 0.058 mm (0.0023 inch)

Repair limit ... 0.080 mm (0.0031 inch)

Camshaft Lobe Lift

Illustration 2	g00295323

(A) Actual lobe lift

(B) Height of the camshaft lobe

(C) Base circle

To determine the lobe lift, use the procedure that follows:

1. Measure the camshaft lobe height (B).

2. Measure the base circle (C).

3. Subtract the base circle that is found in Step 2 from the camshaft lobe height that is found in Step 1. The difference is the actual camshaft lobe lift.

Illustration 3	g00819857

Camshaft lobe lift

(1) Camshaft lobe for inlet and exhaust valves

Diameter of camshaft lobe for the inlet and exhaust valves ... 34.453 mm to 34.507 mm (1.3564 inch to 1.3585 inch)

Maximum service limit of camshaft lobe for the inlet and exhaust valves ... 33.7 mm (1.33 inch)

(2) Camshaft lobe for the fuel injection pump

Diameter of camshaft lobe for the fuel injection pump ... 41.940 mm to 42.060 mm (1.6512 inch to 1.6559 inch)

Maximum service limit of camshaft lobe for the fuel injection pump ... 41.8 mm (1.65 inch)

(3) Camshaft eccentric for the fuel transfer pump

Diameter of the camshaft eccentric for the fuel transfer pump ... 31.900 mm to 32.000 mm (1.2559 inch to 1.2598 inch)

Maximum service limit of camshaft eccentric for the fuel transfer pump ... 30.0 mm (1.18 inch)

Retainer Plate for the Camshaft

Illustration 4	g00819901

(4) Tighten the setscrews for the retainer plate for the camshaft to the following torque. ... 11 N·m (100 lb in)

(5) Retainer plate for the camshaft

(6) Camshaft gear