TM 5-3805-262-34
2-5. FUEL SYSTEM TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
3. EXCESSIVE FUEL USAGE (Cont).
Step 4.
Check backlash between cam-
shaft drive gear and crank-
shaft gear using dial indicat-
or at drive gear as shown.
Backlash should be 0.004 to
0.011 inch.
a. If backlash exceeds 0.011
inch, replace drive gear,
crankshaft gear, or worn
crankshaft bushings (page
4-16) .
b.
If backlash
0.011 inch,
below.
Step 5.
Check backlash
gear and idler
is 0.004 to
go to step 5
between idler drive
gear using dial in-
dicator at idler gear.
Backlash should be 0.003 to 0.010
inch.
a. If backlash exceeds 0.010 inch,
replace idler drive gear or
drive gear (page 4-54).
b.
If backlash is 0.003 to 0.010
inch, check for damaged valve
push rods (page 3-60), worn
valve lifters (page 4-61), worn
or damaged cam lobes on cam-
shaft (page 4-61), worn cam-
shaft bushings (page 4-59) or
worn valve lifter bores in cyl-
inder block (page 4-61).
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