roubleshooting Symptoms Charts
B3.9 and B5.9 Series Engines
Section TS - Troubleshooting Symptoms
Engine Will Not Reach High Idle
This is symptom tree T080-005.
Compare the tachometer reading with a
tool reading. Calibrate or replace the tachom-
eter as necessary. Refer to the OEM service
Check for added loading from malfunctioning
accessories or other engine-driven units,
ngine under excessive load
brakes dragging, or other changes in vehicle
loading. Disengage engine-driven units.
Check and repair fan shroud, viscous fan as
irflow to the radiator restricted
required. Refer to OEM service manual.
Make sure the throttle linkage is not
misadjusted or damaged. Adjust and repair as
ngine will not reach full throttle
necessary. Check the fuel lever for stop-to-stop
travel. Refer to Procedure 005-036.
uel shutoff lever (mechanical) partially
Check for correct solenoid operation. Refer to
Verify by operating the engine from a tempo-
rary supply of No. 2 diesel fuel. Check fuel
oor fuel quality or wrong fuel grade
specifications for proper fuel grade. Refer to
the Operation and Maintenance Manual, B
Series Engines, Bulletin No. 3810205.
Check the flow through the fuel filter. Replace
the fuel filter if necessary. Refer to Procedure
uel filter or fuel inlet restriction
006-015. Clean all prefilters and screens.
Check the fuel suction line for restriction.
uel pump return overflow valve is malfunction-
Inspect the return overflow valve. Replace if
necessary. Refer to Procedure 006-044.