Defender. Manual — part 63
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Powertrain
Engine System - General Information - Bearing Inspection
General Procedures
1. Inspect bearings for the following defects.
1. Cratering - fatigue failure
2. Spot polishing - incorrect seating.
3. Imbedded dirt engine oil.
4. Scratching - dirty engine oil.
5. Base exposed - poor lubrication.
6. Both edges worn - journal damaged.
7. One edge worn - journal tapered or bearing not
seated.
Engine System - General Information - Camshaft Bearing Journal Clearance
General Procedures
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 length 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. Install the camshaft bearing caps.
Follow the relevant tightening sequence.
3. NOTE: Do not strike the bearing caps.
Remove the camshaft bearing caps.
Follow the relevant loosening sequence.
4. Using the special tool, read off the measurement.
Compare the width of plastigage with the plastigage
scale.
The value that is read off is the bearing clearance.
If the values are not to specification install a new
camshaft.
Engine System - General Information - Camshaft Bearing Journal Diameter
General Procedures
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.
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