| Cause |
Correction |
| Starting procedure is incorrect |
Verify proper starting procedures. Refer to the starting procedure in the owners Operation and Maintenance Manual |
| Cranking speed too slow (minimum cranking speed 150 rpms |
Verify the driven units are not engaged. Check the battery starting motor and look for loose or corroded wiring connections. Bar the engine to check for internal rotational resistance. |
| Starting aid needed for cold weather or not working properly. |
Check and repair or replace the cold starting aid, if necessary. Refer to the OEM trouble-shooting and repair manual for recommendations |
| Intake air inadequate or overheated |
Inspect/replace the air cleaner element and look for restrictions. * If the vehicle is equipped with a valve to switch the intake source from under the hood to outside, position the valve for the season. * Check the charge air cooler for internal restriction. Replace the restricted cooler. * Check and clean the debris from the front of the change air cooler. |
| Air in the fuel system |
Bleed the fuel system and check
for suction leaks |
| Fuel Supply Inadequate |
Check the flow through the filter
to locate the source of restriction |
| Fuel quality poor or diesel fuel
grade No. 1 used above 32 deg F |
Verify by operating the engine
form a temporary tank of No. 2 diesel fuel. |
| Fuel drain back |
Verify the fuel return line is
plumbed to the bottom of the fuel tank if applicable |
| Malfunctioning fuel return overflow
valve |
Check/replace the return overflow
valve |
| Fuel inlet restriction |
Maximum inlet restriction to
the fuel transfer pump must not exceed 100 mm Hg (4 in. Hg) |
| Fuel injection pump timing is
incorrect |
Check and adjust the injection
pump timing to engine manufacturer specs |
| Valves incorrectly adjusted (valves
are not sealing) |
Check and adjust the valves |
| Injectors worn or malfunctioning |
Check the injectors and replace
any malfunctioning injectors |
| Engine COMPRESSION IS LOW |
Perform the compression check
to identify the malfunction. |
| Fuel injection pump malfunctioning/delivery
valves malfunctioning |
Remove the fuel injection pump
and repair as necessary |
