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TM 10-4320-348-14
a. Removal. (Refer to Figure 5-6)
CAUTION
Do not touch tip of fuel injection nozzle as damage to equipment can occur.
(1)Remove fuel return line from injector.
(2)Remove two hex head nuts (1), retaining plate (2), and the strap for the valve cover rubber plug.
NOTE
If the nozzle is tight, gently pry nozzle using a small pry bar. Be careful not to pry on the fuel
return hose hub.
(3)Carefully remove fuel injection nozzle (3). Wrap it in clean cloth to protect the nozzle tip. Do not place nozzle tip
directly on any dirty surface without protection.
(4)It nozzle gasket (4) and spacer (5) are not attached to nozzle at removal, screw a 3/8 x 4 inch UNC hex head bolt
into nozzle gasket (4), then remove stud bolt. The nozzle gasket (4) and spacer (5) should come out and be
discarded.
WARNING
Death or serious injury could occur if fuel is not handled properly. Use in a well-ventilated area
away from open flame, arcing equipment, ignition sources, heaters, or excessive heat. Always
store fuel in properly marked containers. DO NOT SMOKE.
b. Test.
(1)Use nozzle test to check injection starting pressure. Pressure should be 2,844 psig (200 kg/cm2) 142 psig (10
kg/sq cm).
(2)Spray pattern should be equal.
(3)Pressurize injector nozzle to 2,030 psig (140 kg/sq cm) for 60 seconds and check for leaks.
(4)If injector nozzle fails either test, replace.
c. Installation.
(1)Install new fuel injection nozzle gasket (4) and spacer (5) onto fuel injection nozzle (3) before installing nozzle into
cylinder block.
NOTE
Make sure nozzle and sleeve surface is clean. Carbon deposits will build up on nozzle in the form
of flowers. Flowering reduces combustion performance significantly.
5-14
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