TM 5-3805-254-20-1
ORGANIZATIONAL TROUBLESHOOTING - CONTINUED
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. ENGINE CRANKS BUT FAILS TO START BELOW 50°F (18°C) - CONTINUED.
WARNING
Diesel fuel burns easily. Do not smoke or allow flame nearby. Disconnect batteries when working
on fuel system. Failure to observe these precautions could cause serious injury to personnel.
Direct spray from preheater nozzle away from you and other personnel. Keep hands
away from front of preheater nozzle. Failure to observe these precautions could cause
serious injury to personnel.
Step 23.
Check preheater nozzle (1) as follows: Using 1 1/4-inch open-end wrench,
unscrew and take preheater nozzle (1) out of housing (2). Screw on and tighten
pressure hose (3) to fitting (4) using 9/16-inch and 7/16-inch open-end
wrenches. Point preheater nozzle (1) into a container and have assistant pump
preheater primer pump (5) until FUEL PRESSURE gage (6) reads 40 to 80 psi
and observe spray pattern from preheater nozzle (1) (see illustration). Get rid
of drained fuel (page 2-424).
a. If fuel flow is a solid stream (view A), an uneven cut-off dribble
(view B), or an uneven of
f-center spray (view C), replace preheater
nozzle (1) (page 2-510).
b. If fuel flow is completely restricted, replace preheater nozzle (1)
(page 2-510).
c. If fuel flow is a fine cone-shaped even mist (view D), unscrew and
take pressure hose (3) off fitting (4) using 9/16-inch and 1/16-inch
open-end wrenches. Screw preheater nozzle (1) into housing (2)
and tighten using 1 1/4-inch open-end wrench. Screw pressure
hose (3) on to fitting (4) and tighten using 9116-inch and 7/16-inch
open-end wrenches. Go to step 24.
Step 24.
Check supply hose (7) from fuel pump fitting (8) to bulkhead fitting (9) for
loose, cracked, or broken condition.
a. If supply hose (7) is loose at fuel pump fitting (8), tighten using
9/16-inch open-end wrench.
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