MBE 900 DDEC VI Troubleshooting – Section 6.4 Internal Engine Damage

Section 6.4
Internal Engine Damage

To determine if internal engine damage is causing no start condition, perform the following steps:‪

1. Install the engine barring tool, refer to MBE 900 Service Manual (6SE9007), engine chapter- engine barring tool.
2. Determine the severity of internal engine damage.
   1. If the engine rotates freely, check the MCM wiring harness; refer to "5.1 MCM Wiring Harness" .
   2. If the engine binds and will not rotate freely, replace crankshaft bearings and cylinder liners, refer to MBE 900 Service Manual (6SE9007), engine chapter-crankshaft or cylinder block.

Section 6.4.1
Internal Engine Damage Replacement

Perform the following steps for crankshaft bearings, and cylinder liner replacement:‪

1. Replace the crankshaft bearings, refer to MBE 900 Service Manual (6SE9007), engine chapter-crankshaft.
2. Replace the cylinder liners.
3. Verify replacement of components; refer to "6.4.1.1 Test Engine with Replaced Components" .

Section 6.4.1.1
Test Engine with Replaced Components

To determine if the new components resolved no start condition, perform the following steps:‪

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. Attempt to start and run the engine, if the engine starts and runs, no further troubleshooting is required. Shut down the engine.
2. If the engine fails to start or run, call Detroit Diesel Customer Support Center at 313-592-5800.