TRUCK SERVICE MANUAL
FUEL SYSTEM
Check 3 - Check Ball Travel
Correction
Orifice must be replaced if threads are damaged, Orifice
Cause
torque is 6 in-lbs [.7 No ml. Ball travel is 0.020 to 0.030
inch [.51 to .76 mm] with orifice torqued in position (for
Loss of ball-travel caused by over-tightening of restrictor
assembly
diagram
refer
to
Fig.
6-1-84).
orifice and consequent stripping of orifice threads.
Caution: Never try to attain the proper ball travel by
loosening the orifice as this will cause leakage around
the threads and defeat the purpose of the restrictor
orifice and check valve.
Check 1 - Soft Lines
Correction
Install lines of material and length shown in Fig. 6-1-121.
Cause
Correction
Use of filter-to-injector and injector-to-regulator lines
(lines L and E in Fig. 6-1-121 ) which are softer and
Replace with standard filter per Fig. 6-1-121.
more resilient than those supplied with test stand.
Note: Be sure that filter is installed in correct location in
Check 2 - Filter Can
the circuit.
Cause
Correction
Original filter has been replaced with one which is larger
See Causes and Corrections under Check 13 of "Test
or has a softer can, such as Cummins throwaway filter.
Stand will not repeat consistently on any given injector."
Check 3 - Aerated Fuel
Cause
Aerated fuel.
490
