Series 60 Defective Fuel Pump

To determine if the fuel pump is causing excessive white smoke, perform the following steps: ‪

1. Insert a piece of wire through the fuel pump flange drain hole
2. Crank the engine momentarily and feel for wire vibration.
   1. If the wire did not vibrate;
   2. If the wire did vibrate, check for aerated fuel;

Drive Hubs and Coupling Replacement

Perform the following for drive hubs or coupling replacement: ‪

1. Replace the drive hubs or coupling;
2. Verify the drive hubs and coupling replacement;

Engine Test with Replaced Drive Hubs or Replaced Coupling

Perform the following to determine if replaced drive hubs and coupling resolved excessive white smoke: ‪

1. Start and run the engine.
2. Run the engine at idle with a no-load for approximately 5 minutes, allowing the engine coolant to reach normal operating range.
3. Visually inspect exhaust for excessive white smoke.
   1. If the engine exhaust emission appears normal, no further troubleshooting is required. Shut down the engine.
   2. If the engine exhaust emission is excessively white, shut down the engine. Check for aerated fuel;