The camshaft is made of induction-hardened steel and has seven main bearings. Each cylinder has cams for intake and exhaust valves and a unit pump.
Remove the camshaft as follows:
Before removing the camshaft, clean the engine to prevent road dirt, grease, or other foreign matter from contaminating the exposed gears and other engine parts.
Drain the engine oil.
To avoid injury when removing or installing a heavy engine component, ensure the component is properly supported and securely attached to an adequate lifting device to prevent the component from falling.
To avoid injury from a falling engine, ensure the engine is securely attached to the engine overhaul stand before releasing the lifting sling.
Remove the engine from the vehicle and support it on a stand.
Lubricate the pushrods with a light coating of clean engine oil. Install the pushrods and the rocker arm assembly. Refer to section
To avoid injury from a falling component, ensure a proper lifting device is used.
Remove the engine from the stand and install it on the vehicle.
Fill the engine with oil.
Inspect the camshaft as follows:
To get a correct hardness reading, it is critical to place a hard base below the cam or bearing journal.
Using the hardness tester (000 589 20 21 00)
, inspect the hardness of the cams and bearing journals at the camshaft. A hard base should be placed below the cam or bearing journal to be inspected. See Figure
Inspecting Cam Hardness
Measure the diameter of each bearing journal. Measure the diameter of the bushing at each journal. See Figure
1. Camshaft Gear
2. Dial Gauge
Measuring the Cam Rise
Mount the camshaft at the outer journals.
For all of the following steps, use a dial gauge.
Measure the radial runout of the cam basic circle.