TM 5-3805-262-34
2-4. ENGINE TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
5. ENGINE NOISY.
Step 1.
Step 2.
Step 3.
Step 4.
If noise
ted, this
Check valve timing (page 3-8).
a. If valve timing is not okay as indicated by dial indicator hand
not indicating 0.053 inch, go to Malfunction 11, page 2-41.
b. If valve timing is okay as indicated by dial indicator hand in-
dicating 0.053 inch, go to step 2 below.
Check fuel injection pump timing (page 3-10) and governor adjust-
ments (page 3-14).
a. If fuel injection pump timing and governor adjustments are not
okay, adjust fuel injection pump timing (page 3-10) and adjust
governor (page 3-14).
b. If fuel injection pump timing and governor adjustments are okay,
go to step 3 below.
Tell assistant to start engine and operate at idle speed.
Listen for noise at flywheel housing with engine operating at idle
speed.
a. If noise is heard, tell assistant to increase engine speed. If
noise goes away when engine speed increases, flywheel is loose.
Tighten flywheel mounting hardware (page 3-57).
b. If noise is not heard at flywheel, go to step 4 below.
Tell assistant to start engine and operate at idle speed.
Listen for noise in cylinder block in line with crankshaft.
increases
indicates
cylinder from which
support maintenance
4-42).
NOTE
when fuel injection line to a cylinder is disconnec-
that problem is a worn piston pin or bushing in the
fuel injection line was disconnected. Notify general
to remove and repair piston and connecting rod (page
a. If noise is heard, tell assistant to increase engine speed.
If noise gets louder and engine vibration increases as engine
rpm increases, main crankshaft bearings are worn.
2-21
