Rough Idle; Engine-Oil Raised High - FAW Jiefang Automotive 485 Operation & Maintenance Manual

Trouble causes
1. Un-uniform oil flow-rate in each cylinder; oil
injector drips oil; pull-rods shifting-fork screw
is loosened.
2. Gap between shifting-fork and adjusting-arm
is too big; steel ball and sliding disc is worn
and dent(s) occurs.
3. Too much axial moving clearance of
fuel-injection pump camshaft.
4. Sleeve of sliding disc is jammed.
1. Cylinder jacket water-seal ring is damaged.
2. Cylinder jacket gasket leaks water.
3. Cylinder cover or engine body leaks water.
XI. Rough idle
1. Make the flow-rate uniform; repair or
replace oil nozzle needle-valve couple,
secure shifting-fork screw
2. Replace them.
3. Adjust it with copper shim.
4. Clean, repair or replace it.
XII. Engine-oil raised high
1. Replace the ring.
2. Replace the gasket.
3. Inspect and replace it.
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Remedial methods