4-40. FUEL INJECTOR ASSEMBLY
(4) Injector plunger and bushing
Make sure high pressure bleed hole in side of bushing is not plugged. If hole is
plugged, fuel oil will leak into engine and cause oil dilution.
Keep plunger and bushing together as they are matched sets. Keep parts of each
injector assembly together.
Wash with cleaning solvent and dry with compressed air.
Measure distance between top of
follower (8) and slot. Dimension
must be 1.645 to 1.649 inches.
Inspect stop pin groove in side of
follower to make sure it is smooth
and not damaged. Do not reuse
follower if there is more than
0.002 inch wear on top or there is
other visual damage or wear.
(2) Follower spring
Examine outside diameter of
follower spring coils (7) for wear
caused by rocker arms contacting
coils. Replace if worn.
Inspect follower springs for rust,
pitting, nicks, or notches in coils,
broken coils, broken coil ends,
and notches under coil ends.
Check spring tension with spring
tester. Replace spring when a
load of less than 78 Ibs will
compress it to 1.028 inches.