Camshaft

Camshaft Bearing Journal Diameter





1. Determine the diameter of the camshaft journals.
^ Using a micrometer measure the diameter at 90 degrees intervals to determine if the journals are out-of-round.
^ Measure at two different points on the journal to determine if there is any tapering.
^ If the measurements are out of the specified range, install a new camshaft.

Camshaft Bearing Journal Clearance





1. NOTE: Make sure that the following stages are followed exactly. The tappets or followers must be removed to carry out this measurement.

NOTE: Make sure that the camshaft is to specification.

NOTE: The bearing caps and journals should be free from engine oil and dirt.

Position on a width of plastigage on the bearing cap.
^ Insert the camshaft, without lubrication, into the cylinder head.
^ Position a plastigage strip, which should be equal to the width of the bearing cap, on the bearing journal.
2. Following the tightening specification, install the camshaft bearing caps.

3. NOTE: Do not strike the bearing caps.

Remove the camshaft bearing caps.





4. Using the Plastigage, read off the measurement.
^ Compare the width of plastigage with the plastigage scale.
^ The value that is read off is the bearing clearance.

Camshaft End Play





1. NOTE: Make sure that the camshaft is to specification.

Using a Dial Indicator Gauge, measure the end play.
^ Slide the camshaft in both directions. Read and note the maximum and minimum values on the Dial Indicator Gauge.
- End play = maximum value minus minimum value.
^ If the measurement is out of specification, install new components.

Camshaft Surface Inspection





1. Inspect the camshaft lobes for pitting or damage in the active area. Minor pitting is acceptable outside the active area.

Camshaft Lobe Lift





1. Determine the cam lift.
^ Using a micrometer measure the cam in two directions.
^ The difference between the two measurements is the cam lift.