Ingersoll-Rand 7120 - Manual (Page 45)

42 7/120 (P425AWIR), 9/110 (XP375AWIR), 10/105 (HP375AWIR), 14/85 (VHP300AWIR),
7/170 (P600WIR), 10/125 (HP450WIR), 14/115 (VHP400WIR)
Intermittent Fault Diagnostics (With
Electronic Controls)
Intermittent faults are problems that periodically
“go away”. A problem such as a terminal that
intermittently doesn’t make contact can cause
an intermittent fault. Other intermittent may be
set only under certain operating conditions such
as heavy load, extended idle, etc. When
diagnosing intermittent faults, take special note
of the condition of wiring and connectors, since
a high percentage of intermittent problems
originate here. Check for loose, dirty or
disconnected connectors. Inspect the wiring
routing, looking for possible shorts caused by
contact with external parts (for example, rubbing
against sharp sheet metal edges). Inspect the
connector vicinity, looking for wires that have
pulled out of connectors, poorly positioned
terminals, damaged connectors and corroded or
damaged splices and terminals. Look for broken
wires, damaged splices, and wire–to–wire
shorts. Use good judgement if component
replacement is thought to be required.
NOTE: The engine control unit (ECU) is the
component LEAST likely to fail.
Suggestions for diagnosing intermittent
faults:
S If the problem is intermittent, try to reproduce
the operating conditions that were present
when the diagnostic trouble code (DTC) set.
Observing these values can help determine
the operating conditions when the fault
occurred.
S
If a faulty connection or wire is suspected to
be the cause of the intermittent problem:
clear DTCs, then check the connection or
wire by wiggling it while watching the
diagnostic gauge to see if the fault resets.
Possible causes of intermittent faults:
S Faulty connection between sensor and
actuator harness.
S
Faulty contact between terminals in
connector.
S Faulty terminal/wire connection.
S Electromagnetic interference (EMI) from an
improperly installed 2–way radio, etc., can
cause faulty signals to be sent to the ECU.
Storage
Engine Storage Guidelines
1. Engines can be stored outside for up to three
(3) months with no long term preparation IF
COVERED BY WATERPROOF COVERING.
2. Engines can be stored in a standard
overseas shipping container for up to three
(3) months with no long term preparation.
3. Engines can be stored inside, warehoused,
for up to six (6) months with no long term
preparation.
Engines expected to be stored more than six (6)
months, long term storage preparation MUST
BE taken.
Preparing Engine for Long Term Storage
The following storage preparations are good for
long term engine storage up to one year. After
that, the engine should be started, warmed up,
and retreated for an extended storage period.
IMPORTANT: Any time your engine will not
be used for over six (6) months, the
following recommendations for storing it
and removing it from storage will help to
minimize corrosion and deterioration.
1. Change engine oil and replace filter. Used oil
will not give adequate protection.
2. Service air cleaner.
3. Draining and flushing of cooling system is not
necessary if engine is to be stored only for
several months. However, for extended
storage periods of a year or longer, it is
recommended that the cooling system be
drained, flushed, and refilled. Refill with
appropriate coolant.
4. Crank the engine several revolutions with
starter (do not allow the engine to start).
5. Remove fan/alternator poly–vee belt, if
desired.
6. Remove and clean batteries. Store them in a
cool, dry place and keep them fully charged.
7. Disengage the clutch for any driveline.
8. Clean the exterior of the engine with salt–free
water and touchup any scratched or chipped
painted surfaces with a good quality paint.
9. Coat all exposed (machined) metal surfaces
with grease or corrosion inhibitor if not
feasible to paint.
10. Seal all openings on engine with plastic
bags and tape.
11. Store the engine in a dry protected place. If
engine must be stored outside, cover it with a
waterproof canvas or other suitable
protective material and use a strong
waterproof tape.