Hobart JET-EX 4 Operation And Maintenance Manual page 76

OM-2049
TROUBLESYMPTOM
AND CONDITION
ENGINE AND CONTROLS
13. Excessive
"pinging" and
detonation
under load.
14. Engine speed
drops excess-
ively when load
is applied.
3-1
Page 14
PROBABLE CAUSE
A. Ignition timing too far
advanced.
B. Poor grade of gasoline.
C. Fuel mixture too lean.
D. Engine overheating.
A. Governor improperly
adjusted.
B. Governor-to-carburetor
linkage binding.
C. Governor-to-carburetor
linkage improperly
adjusted.
D. Excessive load on
generator, or defective
governor.
E. Engine timing is slow.
F. Governor worn or
defective.
TEST, CHECK, AND/OR
REMEDY
A. Check ignition timing and
adjust according to Ford
Maintenance and Operator's
Manual in Chapter 5.
B. Use good, clean gasoline of
92 to 94 octane rating.
C. Check carburetor main metering
system, float level, etc.
Replace carburetor if defective.
D. If engine is running exces-
sively hot, check entire
cooling system. Check for
dirt in system and for dirt
outside of core. Check
thermostat. Repair as
required.
A. Adjust governor. Refer to
Section 2-3, Para. 3.
B. Free the linkage where
binding.
C. Adjust linkage. Refer to
Section L-3, Para. 2, A, (9)
and Para. 3.
D. See that load does not exceed
generator's rating (550A).
Re-check engine speed at
approximately rated load. If
engine speed still drops ex-
cessively, replace governor
and send old governor to
overhaul.
E. Adjust timing in accordance
with Ford Maintenance and
Operator's Manual in Chap. 5.
F. Remove governor and inspect
Replace if necessary.
May 20/89