Section 9.14 Improper Valve Clearance, Worn or Damaged Camshaft Lobes and Rollers

Section 9.14
Improper Valve Clearance, Worn or Damaged Camshaft Lobes and Rollers

To determine if an improper valve clearance, worn or damaged camshaft lobes or rollers are causing excessive exhaust smoke, perform the following:‪

  1. Check for improper valve clearance, and worn or damaged camshaft lobes and rollers. Repair as required, refer to MBE 4000 Service Manual (6SE420), Chapter 1, “Engine - Valves”.
  2. Verify valve clearance, worn or damaged camshaft lobes and rollers repair corrected the excessive exhaust smoke concern; refer to "9.14.1 Test Engine with Corrected Valve Clearance, Worn or Damaged Camshaft Lobes and Rollers" .

Section 9.14.1
Test Engine with Corrected Valve Clearance, Worn or Damaged Camshaft Lobes and Rollers

Perform the following steps to determine if the valve clearance, worn or damaged camshaft lobes and rollers repair has resolved excessive exhaust smoke condition:‪

warning

PERSONAL INJURY

To avoid injury before starting and running the engine, ensure the vehicle is parked on a level surface, parking brake is set, and the wheels are blocked.‪

  1. Start and run the engine.
  2. Run the engine at idle with a no-load condition for approximately five minutes, allowing the engine coolant to reach normal operating range.
  3. Visually inspect exhaust for excessive exhaust smoke.
    1. If the engine exhaust smoke emission appears normal, no further troubleshooting is required. Shut down the engine.
    2. If the engine exhaust smoke emission is excessive, shut down the engine. Check for low compression; refer to "9.15 Low Compression" .


EPA07 MBE 4000 DDEC VI Troubleshooting Guide - 6SE568
Generated on 10-13-2008

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