1988 JEEP CHEROKEE oil pressure
[x] Cancel search: oil pressurePage 165 of 1378
Information pertaining to Sanden compressors in this article,
will be found in earlier articles under Sankyo compressors.
AMERICAN MOTORS & JEEP WITH 5-CYLINDER COMPRESSOR
Compressor Overhaul
1) After the compressor and system have been run, stop the
engine. Slowly discharge system using approved refrigerant
recovery/recycling equipment. Clean and cool dipstick with R-12.
2) Loosen the compressor mounting bolts, remove the drive
belt, and move the compressor to a bench for easiest and most accurate
measurement. Position the compressor so that the oil fill plug is at
top dead center.
3) Thoroughly clean the oil fill plug and the area around it.
Loosen the fill plug slowly to allow trapped refrigerant pressure to
escape through the loosened threads.
4) The front plate hub has a lobe, which is indexed (notched)\
180
from TDC of the cam rotor. Rotate the hub plate lobe until the
index notch is 110 from bottom center. See Fig. 1. Check this
position by looking through the oil fill hole and noting that the ball
end of the top piston rod lines up with the fill hole.
5) Looking at the front end of the compressor, insert the
dipstick diagonally from upper left to lower left until the dipstick
stop contacts the filler hole surface. Remove dipstick and note oil
level. Oil level should be between the 4th and 6th increment on the
dipstick (3-4 ounces). Add oil as necessary.
Compressor Replacement
If system was opened by a leak or so quickly that oil was
lost, install new compressor with all the oil it contains. If system
was opened slowly and oil was not lost, drain oil from new compressor
and measure. Reinstall 6 ounces of oil back into new compressor prior
to installation.
Component Replacement
If a hose, receiver-drier, condenser, expansion valve or
evaporator core requires replacement, add 1 ounce of new oil for each
new component installed.
Compressor Oil Check
1) Discharge system, using approved refrigerant
recovery/recycling equipment, or isolate compressor. Remove oil filler
plug. Look through oil filler plug hole and rotate clutch front plate
to position piston connecting rod in center of oil filler plug hole.
2) Insert dipstick (J-29642-12) through oil filler plug hole\
to the right of piston connecting rod until dipstick stop contacts the
compressor housing.
3) Remove dipstick and count number of increments covered
with oil. If compressor is properly filled, oil will cover 4-6
increments on the dipstick. Adjust oil level as necessary.
Page 167 of 1378
Isolating Compressor
1) Connect manifold gauge set to service valves on
compressor. Close both gauge valves. Open both service valves to the
mid-position.
2) Start engine and operate air conditioning. Turn suction
service valve slowly clockwise toward front-seated position. When
suction pressure is reduced to zero or less, stop engine and quickly
close suction service valve (front-seated).
3) Front-seat the discharge valve. Loosen oil check plug
slowly to release any internal pressure. Service valves can now be
removed from compressor and compressor removed from vehicle (if
necessary). Purge compressor after servicing.
Purging Compressor
1) Remove gauge set and place caps on service valve ports.
Back-seat the suction service valve to allow refrigerant to enter
compressor.
2) Loosen discharge port valve slightly. Loosen valve port
cap to allow refrigerant to force out air from compressor. Back-seat
the discharge valve and tighten the port cap. Compressor is ready for
service.
Compressor Oil Check
1) Operate system for 10 minutes, then stop and isolate
compressor. Loosen filler plug slowly to release any pressure in
crankcase.
2) Use dipstick to check oil level. See Fig. 2. Add oil as
necessary. Install plug with new "O" ring. Purge compressor of air.
Fig. 2: York Compressor Oil Level Dipstick
Check oil with shaft keyway facing head.
SYSTEM SERVICING CAUTIONS
Page 171 of 1378
* Switch to LOW
blower.
* Close doors. Too warm - Check control
lever operation, heater
water valve, cooling
system and gauge readings.
* Check outlet
temperature. 35-45
F (1.7-7.2 C)\
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Visual Check Visual Check Shows:
* Compressor Quiet, No Leaks Noisy - Check belts, oil
level, seals, gaskets,
reed valves.
* Condenser Free of Obstructions Blocked - Clean off.
Plugged - Flush or
replace.
* Receiver-Drier Dry and warm to Frosty - Check for re-
touch striction, replace
Desicant.
* Sight Glass Clear or few bubbles Bubbly, foamy or streaks -
Check gauge readings.
* High Side Lines Dry and warm to Frosty or very hot - Check
touch for restriction or
overcharge.
* Low Side Lines Dry and cool to Frosty or warm - Check for
touch restriction, low charge or
bad valve.
* Expansion Valve Dry Frosty - Check for moisture
or restriction. Check
sensing bulb.
* STV Dry and cool to Frosty or warm - Check
touch gauge readings for valve
malfunction.
* Evaporator Dry and cold to Freezing or warm - Check
touch expansion valve, STV or
thermo switch.
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Gauge Readings Gauge Readings are:
* High Side Gauge See Pressure Chart Above or below normal - See
A/C DIAGNOSIS.
* Low Side Gauge See Pressure Chart Above or below normal - See
A/C DIAGNOSIS.
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PRESSURE CHARTS
Page 174 of 1378
![JEEP CHEROKEE 1988 Service Repair Manual Tiny bubbles in sight
glass. Discharge air warm
when low side gauge drops
into vacuum.
\](/manual-img/16/57037/w960_57037-173.png "JEEP CHEROKEE 1988 Service Repair Manual Tiny bubbles in sight
glass. Discharge air warm
when low side gauge drops
into vacuum.
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Tiny bubbles in sight
glass. Discharge air warm
when low side gauge drops
into vacuum.
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Normal Normal Thermostatic switch system Defective Thermo-
only-compressor cycles off static Switch
and on too rapidly.
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Normal Normal Cycling clutch systems Misadjusted Thermo
to High only-Compressor doesn't static Switch or
turn on soon enough. Defective Pressure
Discharge air becomes Sensing Switch
warm as low side
pressure rises.
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Low Low Bubbles in sight glass. Low R-12 Charge
Outlet air slightly cool.
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Low Low Sight glass clear or oil- Excessively Low
streaked. Outlet air very R-12 Charge
warm.
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Low Low Outlet air slightly cool. Expansion Valve
Sweating or frost at Stuck Closed.
expansion valve. Screen Plugged or
Sensing Bulb
Malfunction
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Low Low Outlet air slightly cool. Restriction on
High side line cool to High Side.
touch. Sweating or frost
on high side.
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Low High Evaporator outlet pipe STV Stuck Open
cold. Low side goes into
vacuum when blower is
disconnected.
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High Low Evaporator outlet pipe STV Stuck Open
warm. Outlet air warm.
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High Low Noise from compressor Compressor
Malfunction
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High High Outlet air warm. Condenser
Liquid line very hot. Malfunction or
Bubbles in sight glass. R-12 Overcharge
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High High Outlet air slightly cool. Large Amount of
Bubbles in sight glass. Air and Moisture
in System.
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High High Outlet air warm. Expansion Valve
Evaporator outlet Stuck Open.
sweating and frost.
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(1) - If equipped with a low refrigerant charge protection system,
compressor operation may have stopped.
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A/C SYSTEM SERVICE SPECIFICATIONS
Page 331 of 1378
Remove axle shaft oil seal from axle housing tube.
3) Place axle shaft in a vise. Drill a 1/4" (6.35 mm) hole
3/4 of the way through bearing retaining ring. Chisel off bearing
retaining ring. Do not use a torch. Press bearing off axle. Remove
seal and retainer plate.
Installation
Lubricate bearing and seal lip. Install retainer plate and
seal over axle. Press axle shaft bearing and retaining ring on shaft
simultaneously. Ensure bearing and ring are seated against axle shaft
shoulder. To complete installation, reverse removal procedure to
complete installation.
WHEEL CYLINDER
Removal
Remove wheel assemblies, brake drums and brake shoes.
Disconnect brake line at wheel cylinder. Do not bend brake line away
from cylinder. Remove cylinder-to-support plate bolts. Remove
cylinder.
Installation
To install, reverse removal procedure. Start brake line
fitting into cylinder before installing cylinder to support plate.
OVERHAUL
DISC BRAKE CALIPER
Disassembly
1) Clean caliper exterior with brake cleaning solvent. Drain
residual fluid from caliper and place caliper on a clean working
surface.
2) Remove piston from caliper by applying compressed air to
inlet port. Use just enough pressure to ease piston out of bore.
Protect piston from damage with folded shop towels. Do not try to
catch piston by hand.
3) Pry dust boot out of bore with screwdriver. Do not scratch
bore. Using a small plastic or wooden stick, pry piston seal from
bore. See Fig. 11. Remove bleeder screw, sleeves, and bushings.
Cleaning & Inspection
Clean all parts with brake cleaning solvent. Blow dry parts.
Check for damaged or worn parts. Stains on piston bore can be polished
with crocus cloth. Do not use emery cloth or any other abrasive.
Reassembly
1) Lubricate bore and new seal with brake fluid. Install seal
in groove using fingers. Lubricate piston with brake fluid. Slide
metal retainer portion of dust boot over open end of piston. Pull boot
rearward until boot lip seats in piston groove.
2) Push retainer portion of dust boot forward until boot is
flush with rim at open end of piston and boot fold snaps into place.
Insert piston in bore being careful not to unseat piston seal.
3) Push piston to bottom of bore using hammer handle.
Position dust boot retainer in counterbore at top of piston bore. Seat
dust boot retainer with Dust Boot Installer (J-22904 or J-33028).
Reverse removal procedure to complete installation.
Page 436 of 1378
FLANGES
FLEX PLATES
FLUID LEVEL INDICATORS
FLUIDS AND LUBRICANTS
FLYWHEELS
FORCE MOTORS
GUIDES
HALF SHAFTS
HOSES, LINES AND TUBES
HOUSINGS (BELL, CASE, TAIL (EXTENSION) AND AUXILIARY)
INTERMEDIATE SHAFT SUPPORT BEARINGS
KEY INTERLOCK SYSTEMS
LIMITED SLIPS
LINES
LINKAGES (EXTERNAL)
LOCKING HUB ASSEMBLIES
LOCKING HUB CONTROL KNOBS
LUBRICANTS
METAL-CLAD SEALS
METALASTIC JOINTS
MODULATOR PINS
MODULATORS
MOUNTS (ENGINE, TRANSAXLE AND TRANSMISSION)
ODOMETER DRIVES (MECHANICAL)
ODOMETER HEADS (MECHANICAL)
OIL PANS
PANS
PILOT HOLES
PRESSURE PLATES
PRESSURE SWITCHES
RACES
RUBBER JOINTS (METALASTIC)
SCREENS
SEALS
SEALS (METAL-CLAD)
SELECTOR INTERLOCK SYSTEMS
SERVOS
SHIFT INTERLOCK SYSTEMS (SELECTOR AND KEY INTERLOCK SYSTEMS)
SENSORS
SIDE COVERS
SLIP YOKES
SOLENOIDS
SPEED SENSORS (ELECTRONIC WHEEL AND VEHICLE)
SPEEDOMETER-DRIVEN GEAR HOUSINGS
SPEEDOMETER/ODOMETER DRIVES (MECHANICAL)
SPEEDOMETER/ODOMETER HEADS (MECHANICAL)
SPEEDOMETERS AND ODOMETERS (ELECTRONIC)
SWITCHES
TONE WHEELS
TOOTHED RINGS (TONE WHEELS)
TORQUE CONVERTERS
TRANSAXLE MOUNTS
TRANSDUCERS (TRANSMISSION)
TRANSMISSION COOLERS
TRANSMISSION MOUNTS
TRANSMISSION PANS
TRANSMISSION RANGE INDICATORS (PRNDL)
TUBES
UNIVERSAL JOINTS (CARDON OR CROSS TYPE)
VACUUM CONTROLS
VACUUM HOSES
VACUUM MOTORS
VACUUM-OPERATED SWITCHES
Page 448 of 1378
![JEEP CHEROKEE 1988 Service Repair Manual CLUTCH DISCS (MANUAL TRANSMISSION)
CLUTCH DISC (MANUAL TRANSMISSION) INSPECTION \
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CLUTCH DISC (MANUAL TRANSMISSION) INSPECTION \
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CLUTCH DISCS (MANUAL TRANSMISSION)
CLUTCH DISC (MANUAL TRANSMISSION) INSPECTION \
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Condition Code Procedure
Backing plate cracked ... A ............ Require replacement.
Broken .................. A ............ Require replacement.
Contaminated with oil ... A ............ Require replacement.
Damper cushion broken ... A ............ Require replacement.
Damper cushion
collapsed .............. A ............ Require replacement.
Damper spring collapsed . A ............ Require replacement.
Damper spring missing .. C ........ ( 1) Require replacement.
Friction material cracked
through ................ B ............ Require replacement.
Friction material flaking
or chunking ............ B ............ Require replacement.
Friction material surface
cracking ............... B ......... No service suggested or
required.
Grooved ................. B ......... No service suggested or
required unless the pressure
plate or flywheel is being
resurfaced or replaced. In this
case, replacement of clutch
disc is required.
Ridged .................. B ......... No service suggested or
required unless the pressure
plate or flywheel is being
resurfaced or replaced. In this
case, replacement of clutch
disc is required.
Splines worn, affecting
performance ............ A ............ Require replacement.
Warped .................. A ............ Require replacement.
Wear exceeds
specifications (where
applicable) ............ B ............ Require replacement.
Worn close to the end of
its useful life ........ 1 ............ Suggest replacement.
Worn, affecting
performance ............ A ............ Require replacement.
( 1) - Not all clutch discs have springs in all spring
chambers on the disc.
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CLUTCH FORKS
CLUTCH FORK INSPECTION \
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Condition Code Procedure
Bent .................... B ............ Require replacement.
Broken .................. A .. Require repair or replacement.
Cracked ................. B .. Require repair or replacement.
Worn close to the end of
its useful life ........ 1 ............ Suggest replacement.
Worn, affecting
performance ............ A ............ Require replacement.
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Page 462 of 1378
Condition Code Procedure
Attaching hardware
broken ................. A ... Require repair or replacement
of hardware.
Attaching hardware
missing ................ C .......... Require replacement of
hardware.
Attaching hardware not
functioning ............ A ... Require repair or replacement
of hardware.
Broken .................. A ............ Require replacement.
Leaking (hydraulic
mount) ................. A ............ Require replacement.
Mounting hole worn,
affecting performance .. A ............ Require replacement.
Mounting hole worn, not
affecting performance .. .. ........ No service suggested or
required.
Rubber deteriorated,
affecting performance .. A ............ Require replacement.
Rubber deteriorated, not
affecting performance .. .. ........ No service suggested or
required.
Threads damaged ......... A .. Require repair or replacement.
Threads stripped (threads
missing) ............... A ............ Require replacement.
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ODOMETER DRIVES (MECHANICAL)
See SPEEDOMETER/ODOMETER DRIVES (MECHANICAL) .
ODOMETER HEADS (MECHANICAL)
See SPEEDOMETER/ODOMETER HEADS (MECHANICAL) .
OIL PANS
See TRANSMISSION PANS .
PANS
See TRANSMISSION PANS .
PILOT HOLES
See DOWEL PINS, GUIDES AND PILOT HOLES .
PRESSURE PLATES
PRESSURE PLATE INSPECTION \
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Condition Code Procedure
Balance weight missing .. C ............ Require replacement.
Broken .................. A ............ Require replacement.
Contact surface
distorted .............. B ............ Require replacement.
Cracks .................. B ............ Require replacement.
Fingers bent ............ A ............ Require replacement.
Hard spots .............. B ............ Require replacement.