TRUCK SERVICE MANUAL
FUEL SYSTEM
Check 5 - Loose Or Broken Plunger, Coupling Swage
Correction
Joint
Attempt to rotate by hand-replace if defective.
Cause
J and C injector springs could be mixed with PT (type D)
springs. PT (type D) springs are 1/16 inch [1.59 mm]
Coupling not swaged deep enough into plunger.
longer, have 0.187 inch [4.75 mm] diameter wire with a
slightly larger O.D.
Wrong spring used.
Correction
Check 6 - Excessive Link Wear
Mark links when removed.
Cause
Part number should be installed in up position.
New link placed in old socket.
Correction
5/16 inch [7.94 mm] link turned end for end at time of
assembly.
This is normal wear. Unless metal is displaced or wear
is measurable, plunger may be reused.
Check 7 - Bright Polished Spots At Top And Bottom
Of Plunger 180 deg. Apart
Cause
Bearing pattern on plunger.
493
