Series 50 – Section 17.7 Low Cranking Speed

Section 17.7
Low Cranking Speed

To determine if low cranking speed is causing starting difficulty, perform the following steps:‪

1. Install a tachometer to the engine and record engine revolution while cranking the engine; refer to OEM for guidelines.
   1. If the cranking speed is greater than 100 r/min, check the fuel supply valve; refer to "17.8 Fuel Supply Valve" .
   2. If the cranking speed is less than 100 r/min; refer to "17.7.1 Low Cranking Speed Repair" .

Section 17.7.1
Low Cranking Speed Repair

Perform the following for low cranking speed repair:‪

1. Drain the engine oil. Refer to "13.5.1 Lubricating Oil" .
2. Remove oil filter(s); refer to "3.5.2 Cleaning and Removal of Oil Filter" .
3. Install new oil filter(s); refer to "3.5.3 Installation of Oil Filter" .
4. Refill the lubrication system with new oil; refer to "13.5.1 Lubricating Oil" .
5. Verify low cranking speed repair; refer to "17.7.1.1 Test Engine with Replaced Oil" .

Section 17.7.1.1
Test Engine with Replaced Oil

Perform the following to determine if the replaced oil resolved starting difficulty:‪

1. Attempt to start and run the engine.
   1. If the engine starts and runs, no further troubleshooting is required. Shut the engine down.
   2. If the engine fails to start and run, check the fuel supply valve; refer to "17.8 Fuel Supply Valve" .