S-SERIES INSTRUMENTS
CABLE SERVICE
Removal
1.
Disconnect upper
end
of
speedometer
or
tachometer cable by removing four mounting
screws from instrument cluster and detaching
cluster enough to expose back of cluster.
2.
Depress spring clasp on back of speedometer or
tachometer and release cable (Figure 4).
3.
Unscrew cable lower or drive end from adapter
at either transmission or engine component.
4.
Unfasten cable from any ties or slips and remove
complete cable assembly from chassis.
Inspection 1.Pull the flexible core out of case.
2.
Check for kinks by rolling core on a flat surface.
A core kink will show up as a hop at kinked
point.
3.
Check for frayed spots by running core loosely
through fingers.
Core Replacement
Never reuse a kinked or frayed core. A kinked core will
cause a fluctuation of speedometer or tachometer
reading and a frayed core will fail completely a short time
after being returned to service.
NOTE - When replacing core, be sure core Is not too
long. A long core will cause a damaging thrust to
head of speedometer or tachometer when Installed.
Installation
Apply a thin coat of lubricant (IH #251 H EP) to core at
reassembly as follows:
1.
Place approximately 1 teaspoon of lube in one
hand.
2.
Feed the core (lower end first) through the lube
and into casing.
3.
Keep last four inches of cable free of lube to
prevent lube from entering the instrument head.
4.
Install complete cable assembly in chassis and
connect
in
reverse
order
of
"Removal"
procedure.
IMPORTANT - Avoid sharp bends when installing
speedometer or tachometer cables. Under no
circumstances should a casing have less than a six
inch radius bend. Route tachometer cable away
from compressor discharge line and strap to stay
rod to avoid cable damage.
SPEEDOMETER, TACHOMETER AND CABLE TROUBLESHOOTING GUIDE
PROBLEM
PROBABLE CAUSE
SOLUTION
Inoperative
1
Cable disconnected
1
Connect cable.
2
Broken core
2
Repair or replace.
3
Damaged speedometer or
3
Replace.
tachometer.
Indicator pointer fluctuates
1
Kinked core
1
Repair or replace.
2
Cable improperly routed
2
Route cable correctly.
3
Cable improperly installed in
3
Install cable correctly.
speedometer or tachometer head.
Noisy, clicking or squealing
1
Damaged or worn parts in
1
Replace.
speedometer or tachometer.
2
Damaged core
2
Repair or replace.
3
Cable improperly routed
3
Route cable correctly.
Reads incorrectly
1
Wrong adapter
1
Install correct adapter.
2
Cable improperly installed
2
Install cable correctly.
3
Speedometer or tachometer not
3
Replace.
calibrated.
CTS-4140Y Page 7