C-15, C-16, and C-18 Truck Engines Caterpillar

Illustration 1	g00285342

(1) Exhaust lobe

(2) Injector lobe

(3) Inlet lobe

(4) Diameter of Camshaft journal ... 84.85 ± 0.02 mm (3.341 ± 0.001 inch)

(5) Front of camshaft

Illustration 2	g00466866

(6) The camshaft lobe lift

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

1. Measure the camshaft lobe height (7).

2. Measure the base circle (8).

3. Subtract the base circle measurement in Step 2 from the camshaft lobe height in Step 1. The difference is the actual lobe lift (6).

4. The specified camshaft lobe lift (6) can be found in Table 1.
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   Table 1

   Model Number	Part Number of the Camshaft	Exhaust Lobe	Inlet Lobe	Injector Lobe
   C-15	139-0537	8.515 mm (0.3352 inch)	9.702 mm (0.3820 inch)	10.212 mm (0.4020 inch)
   	136-7908	8.515 mm (0.3352 inch)	9.702 mm (0.3820 inch)	10.471 mm (0.4122 inch)
   C-16	139-0537	8.515 mm (0.3352 inch)	9.702 mm (0.3820 inch)	10.212 mm (0.4020 inch)
   	185-9699	8.515 mm (0.3352 inch)	9.431 mm (0.3713 inch)	10.451 mm (0.4115 inch)
   C-18	185-9699	8.515 mm (0.3352 inch)	9.431 mm (0.3713 inch)	10.451 mm (0.4115 inch)
   	201-2677	8.515 mm (0.3352 inch)	9.702 mm (0.3820 inch)	10.445 mm (0.4112 inch)

The minimum permissible difference between the actual lobe lift in Step 3 and the specified lobe lift in Step 4 is 0.13 mm (0.005 inch).