Section 4.6
Worn or Damaged Valve or Cylinder Kit
Loss of compression in MBE 4000 engines may result from a variety of sources, including worn or broken fire or compression rings, holes in pistons, leaky valves, scored or worn cylinder walls, leaky or broken gaskets and cracked cylinder heads or cylinder liners. The detection and elimination of the cause or causes of cylinder pressure losses is vital to engine life and efficient operation. The following test procedure has been developed to effectively measure the loss of cylinder pressure and locate the source of abnormal leaks in individual cylinders.
Section 4.6.1
Worn or Damaged Valve or Cylinder Kit Repair
Perform the following steps to determine a worn or damaged valve or cylinder kit:
- Remove cylinder head. Refer to the MBE 4000 Service Manual (6SE420), Chapter 1, “Engine — Cylinder Head”.
- Inspect the cylinder head for worn or damaged valves. Refer to the MBE 4000 Service Manual (6SE420), Chapter 1, “Engine — Valves”.
- Inspect the cylinder head components for worn or damaged liners examine the pistons or piston rings.
- Verify repairs made to cylinder valve(s) or cylinder kit components; refer to "4.6.1.1 Verification of Repair for Worn or Damaged Valve or Cylinder Kit" .
Section 4.6.1.1
Verification of Repair for Worn or Damaged Valve or Cylinder Kit
Perform the following steps to determine if the repaired valve or cylinder kit resolved the misfiring cylinder condition:
 PERSONAL INJURY |
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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. |
- Start the engine.
- Run the engine speed up to the occurrence of the misfiring.
- Listen for misfiring cylinder.
- If the engine is not misfiring, no further troubleshooting is required. Shut down the engine.
- If the engine is misfiring, shut down the engine. Call Detroit Diesel Customer Support Center at 313–592–5800.
| EPA07 MBE 4000 DDEC VI Troubleshooting Guide - 6SE568 |
| Generated on 10-13-2008 |