Land Rover Discovery: Engine System - General Information Bearing Inspection (G61255) / General Procedures

GENERAL PROCEDURES

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 Diameter (G61234) General Procedures

GENERAL PROCEDURES

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.

Engine System - General Information Camshaft End Play (G61236) General Procedures

NOTE:

Make sure that the camshaft is to specification.

Using the special tool, 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.

Engine System - General Information Camshaft Lobe Lift (G61238) General Procedures

Measure the diameter (1) and diameter (2) with a vernier caliper.

The difference in measurements is the lobe lift.

Engine System - General Information Camshaft Surface Inspection (G61237) General Procedures

Inspect camshaft lobes for pitting or damage in the active area.

Minor pitting is acceptable outside the active area.

Engine System - General Information Connecting Rod Cleaning (G61251) General Procedures

CAUTION:

Do not use a caustic cleaning solution or damage to connecting rods may occur.

Mark and separate the parts and clean with solvent. Clean the oil passages.

Engine System - General Information Connecting Rod Large end Bore (G61252) General Procedures

Measure the bearing bore in two directions. The difference is the connecting rod bore out-of-round. Verify the out-of-round is within specification.

Engine System - General Information Cylinder Bore out-of-round (G61243) General Procedures

GENERAL PROCEDURES

NOTE:

The main bearing caps or lower crankcase must be in place and tightened to the specified torque; however, the bearing shells should not be installed.

Measure the cylinder bore with an internal micrometer.

• Carry out the measurements in different directions and at different heights to determine if there is any out-ofroundness or tapering.
• If the measurement is out of the specified range, hone out the cylinder block or install a new block.

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