Section 5.7 Low Cranking Speed

Section 5.7
Low Cranking Speed

To determine if low cranking speed is causing starting difficulty, install a tachometer to the engine and record engine revolution while cranking the engine. Refer to OEM guidelines.‪

1. If the cranking speed is greater than 100 rpm, check the OEM fuel supply valve; refer to "5.8 Fuel Supply Valve" .
2. If the cranking speed is less than 100 rpm; refer to "5.7.1 Low Cranking Speed Repair" .

Section 5.7.1
Low Cranking Speed Repair

Perform the following steps for low cranking speed repair:‪

1. Drain the engine oil, refer to MBE 900 Service Manual (6SE9007), preventative maintenance chapter.
3. Remove the oil filter and install a new oil filter, refer to MBE 900 Service Manual (6SE9007), preventative maintenance chapter.
4. Refill the lubrication system with new oil.
5. Verify low cranking speed repair; refer to "5.7.1.1 Test Engine with Replaced Oil" .

Section 5.7.1.1
Test Engine with Replaced Oil

To determine if the replaced oil resolved starting difficulty, 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 and run, check the fuel supply valve; refer to "5.8 Fuel Supply Valve" .