A/C COMPRESSOR OIL CHECKING
Article Text
1989 Volkswagen Golf
For Volkswagen Technical Site
Copyright © 1998 Mitchell Repair Information Company, LLC
Monday, August 23, 1999 11:35PM
ARTICLE BEGINNING
1989 GENERAL SERVICING
Compressor Refrigerant Oil Checking
* PLEASE READ THIS FIRST *
CAUTION: When discharging air conditioning system, use only approved
refrigerant recovery/recycling equipment. Make every attempt
to avoid discharging refrigerant into the atmosphere.
ISOLATING COMPRESSOR
NOTE: Only compressors with stem-type service valves can be
isolated.
1) Connect service gauge set to the compressor service valves
and open compressor valves slightly (turn in clockwise). Start engine
and operate air conditioning. Slowly turn compressor suction valve
clockwise toward closed (front-seated) position.
2) When suction pressure is reduced to zero or less, turn off
engine and compressor and quickly turn suction valve stem in to full
front-seated position. Suction pressure should be slightly above zero.
Turn discharge valve into front-seated position.
3) To check oil level, slowly open compressor crankcase plug
to relieve any remaining pressure. After oil level is corrected, cap
service gauge ports on both valves. Back-seat suction service valve to
allow refrigerant to enter compressor. Open discharge valve halfway.
4) Loosen discharge service valve cap, allowing refrigerant
pressure to force air out of compressor. Back-seat service valve and
tighten cap. Compressor is now ready for operation.
REFRIGERANT OIL
Only new, pure, moisture-free refrigerant oil should be used
in the air conditioning system. This oil is highly refined and
dehydrated to a point where moisture content is less than 10 parts per
million. The oil container must be tightly closed at all times when
not in use, or moisture will be absorbed into the refrigerant oil from
the air.
DISCHARGING SYSTEM PRECAUTIONS
CAUTION: When discharging air conditioning system, use only approved
refrigerant recovery/recycling equipment. Make every attempt
to avoid discharging refrigerant into the atmosphere.
If compressor has stem-type service valves, it can be
isolated and removed without discharging entire system. Otherwise,
discharge system completely using approved refrigerant
A/C COMPRESSOR OIL CHECKING
Article Text (p. 2)
1989 Volkswagen Golf
For Volkswagen Technical Site
Copyright © 1998 Mitchell Repair Information Company, LLC
Monday, August 23, 1999 11:35PM
recovery/recycling equipment before loosening any fittings.
DISCONNECTING LINES & FITTINGS TEST
After system is discharged, carefully clean area around all
fittings to be opened. Always use 2 wrenches when tightening or
loosening fittings to avoid twisting or distorting lines. Cap or plug
all openings as soon as lines are removed. Do not remove caps until
immediately before connections are made. This will keep entry of air
and moisture to a minimum.
CONNECTING LINES AND FITTINGS
A new gasket or "O" ring should be used in all instances when
connecting lines or fittings. Dip "O" ring in new refrigerant oil and
ensure it is not twisted during installation. Always use 2 wrenches to
prevent damage to lines and fittings.
PLACING SYSTEM IN OPERATION
After component service or replacement has been completed and
all connections have been made, evacuate system thoroughly with a
vacuum pump. Charge system with proper amount of refrigerant and
perform a leak test. See REFRIGERANT OIL & R-12 SPECIFICATIONS chart
in this section for system capacities. Be sure to check all fittings
that have been opened. After system has been leak tested, make a
system performance check.
NOTE: Air conditioning systems will not normally need addition of
refrigerant oil unless definite oil loss has occurred due to
ruptured lines, leaking compressor seals, compressor
overhaul or component replacement.
ATSUGI ROTARY VANE DRAIN & REFILL
1) Before checking and adjusting oil level, operate
compressor at engine idling speed, with controls set for maximum
cooling and high blower speed, for 20 to 30 minutes to return oil to
compressor.
2) Stop engine, discharge refrigerant using approved
refrigerant recovery/recycling equipment and remove compressor from
vehicle. Drain compressor oil from compressor discharge port and
measure the amount. Oil is sometimes hard to drain when compressor is
cool. Remove oil while compressor is warm.
3) If the amount drained is less than 3 ounces, conduct leak
tests at system connections, and if necessary, repair or replace
faulty parts. Check purity of oil and adjust oil level as follows.
4) If amount drained was above 3 ounces, oil level is right.
Pour in same amount as was drained. If amount drained was below 3
ounces, pour in 3 ounces of new refrigerant oil.
A/C COMPRESSOR OIL CHECKING
Article Text (p. 3)
1989 Volkswagen Golf
For Volkswagen Technical Site
Copyright © 1998 Mitchell Repair Information Company, LLC
Monday, August 23, 1999 11:35PM
BOSCH 6-CYL DRAIN & REFILL
1) Before checking and adjusting oil level, operate
compressor at engine idling speed, with controls set for maximum
cooling and high blower speed, for 20 to 30 minutes to return oil to
compressor.
2) Stop engine and discharge refrigerant using approved
refrigerant recovery/recycling equipment. Remove refrigerant oil level
inspection plug on side of compressor. Oil should be at lower lip of
threaded hole. Add necessary new refrigerant oil (if low). Replace
inspection plug and tighten to 10-12 ft. lbs. (14-16 N.m).
DIESEL KIKI ROTARY VANE DRAIN & REFILL
1) Before checking and adjusting oil level, operate
compressor at engine idling speed, with controls set for maximum
cooling and high blower speed, for 20 to 30 minutes to return oil to
compressor.
2) Stop engine, discharge refrigerant using approved
refrigerant recovery/recycling equipment and remove compressor from
vehicle. Drain compressor oil from compressor discharge port and
measure the amount. Oil is sometimes hard to drain when compressor is
cool. Remove oil while compressor is warm.
3) If the amount is less than 2.4 ounces, conduct leak tests
at system connections, and if necessary, repair or replace faulty
parts. Check purity of oil and adjust oil level as follows.
4) If amount drained was above 2.4 ounces, oil level is
right. Pour in same amount as was drained. If amount drained was below
2.4 ounces, pour in 2.4 ounces of new refrigerant oil.
DIESEL KIKI 6-CYL DRAIN & REFILL
1) Before checking and adjusting oil level, operate
compressor at engine idling speed, with controls set for maximum
cooling and high blower speed, for 20 to 30 minutes to return oil to
compressor.
2) Stop engine, discharge refrigerant using approved
refrigerant recovery/recycling equipment and remove compressor from
vehicle. Remove oil drain plug and drain oil. Measure amount of oil
drained. Install drain plug with new "O" ring.
3) If amount drained was more than 2 ounces, refill with same
amount of new oil. If amount drained was less than 2 ounces, refill
with 2 ounces. Install filler plug and recharge system.
HARRISON 4-CYL DRAIN & REFILL
NOTE: The Harrison compressor does NOT have an oil sump. It's
crucial that the compressor remains well oiled. It takes
very little time to destroy this compressor if it runs dry.
The Harrison 4-cyl compressor is charged (new) with 6 ounces
A/C COMPRESSOR OIL CHECKING
Article Text (p. 4)
1989 Volkswagen Golf
For Volkswagen Technical Site
Copyright © 1998 Mitchell Repair Information Company, LLC
Monday, August 23, 1999 11:35PM
of refrigerant oil. Because compressor does not have an oil sump, it
should not have to be removed for oil measurement (it retains very
little oil). Note the following situations for checking and adding oil
to this compressor.
NO OIL LEAK; REPLACING COMPONENTS
If only the compressor is to be replaced, remove, drain oil,
measure and reinstall an equal amount of new oil. If evaporator is
being replaced, add 3 ounces of new oil. If condenser is being
replaced, add one ounce.
LOSS OF REFRIGERANT OVER EXTENDED PERIOD
When a loss of refrigerant has occurred over an extended
period of time and a component is being replaced to correct the leak,
add an appropriate amount of refrigerant oil to the component.
SIGNS OF EXCESSIVE OIL LEAKAGE
If system has lost excessive oil, remove accumulator. Drain
and measure oil. If more than 3 ounces is measured, replace the same
amount of new oil as was drained. If less than 3 ounces is measured,
add 3 ounces of new oil. Add and additional 2 ounces of new oil to
compensate for that lost by replacing the accumulator (held in
desiccant).
HARRISON 6-CYL DRAIN & REFILL
1) If system is operable, run for several minutes to
stabilize system before performing repairs. Turn off engine, discharge
system using approved refrigerant recovery/recycling equipment and
remove compressor. Remove drain plug. Drain and measure oil.
2) If amount drained was 7 ounces or more, add the same
amount of new refrigerant oil. If less than 7 ounces was drained, add
7 ounces of new refrigerant oil to compressor.
3) If air conditioner components are replaced, refrigerant
oil will need to be added to system. Add 3 ounces if condenser or
evaporator is replaced. Add one ounce if drier is replaced.
NOTE: If oil drained contains metal chips or other debris, replace
receiver-drier. Flush out system before evacuating and
recharging.
HITACHI 6-CYL DRAIN & REFILL
1) Before checking and adjusting oil level, operate
compressor at engine idling speed, with controls set for maximum
cooling and high blower speed, for 10 minutes to return oil to
compressor.
2) Stop engine, discharge refrigerant using approved
A/C COMPRESSOR OIL CHECKING
Article Text (p. 5)
1989 Volkswagen Golf
For Volkswagen Technical Site
Copyright © 1998 Mitchell Repair Information Company, LLC
Monday, August 23, 1999 11:35PM
refrigerant recovery/recycling equipment and remove compressor from
vehicle. Drain oil from compressor suction port. Measure amount of oil
drained. If amount drained was more than 2.4 ounces, refill with same
amount of new oil. If amount drained was less than 2.4 ounces, refill
with 2.4 ounces. Install compressor and recharge.
MATSUSHITA ROTARY VANE DRAIN & REFILL
Discharge system using approved refrigerant
recovery/recycling equipment. Remove compressor from vehicle. Drain
oil from compressor through inlet and outlet holes. Refill compressor
with 3.4-4.7 ounces of oil through suction port. When replacing
evaporator, add 2 ounces. When replacing other A/C components, add 1.4
ounces per component replaced.
NIPPONDENSO 6 & 10-CYL DRAIN & REFILL
When inspecting system for oil loss, look for signs of
leaking (shiny, wet spots on components or underside of hood). If oil
leak is noted or component replacement is required, use the following
procedure as indicated:
NO OIL LEAK
Discharge system using approved refrigerant
recovery/recycling equipment and change components as necessary. Add
refrigerant oil to components as necessary.
OIL LEAK
1) Slowly discharge system using approved refrigerant
recovery/recycling equipment. Repair or replace faulty components. If
equipped with a drain plug, remove plug, drain and discard oil. If not
equipped with a drain plug, remove compressor from vehicle and pour
oil out suction and discharge ports.
2) Replace drain plug (if equipped). Add 1.5 ounces of new
refrigerant oil through suction port. Use new gaskets or "O" rings
when replacing suction and discharge lines.
COMPRESSOR FAILURE OR SYSTEM CONTAMINATED
If either situation exists, discharge system using approved
refrigerant recovery/recycling equipment and remove compressor,
receiver-drier and expansion valve. Clean expansion valve screen.
Flush entire system. Install new compressor and receiver-drier. New
compressors contain correct amount of oil. If installing overhauled
compressor, add 1.5 ounces of new refrigerant oil through suction
port.
SANDEN SCROLL DRAIN & REFILL
A/C COMPRESSOR OIL CHECKING
Article Text (p. 6)
1989 Volkswagen Golf
For Volkswagen Technical Site
Copyright © 1998 Mitchell Repair Information Company, LLC
Monday, August 23, 1999 11:35PM
Discharge system using approved refrigerant
recovery/recycling equipment. Remove compressor from vehicle. Drain
oil from compressor through inlet and outlet holes. Refill compressor
with 2.8 ounces of oil through suction port. When replacing condenser,
add .5 ounce. When replacing evaporator, add 1.7 ounces. When
replacing other A/C components, add .5 ounce per component replaced.
SANDEN 5-CYL DRAIN & REFILL
1) Discharge system using approved refrigerant
recovery/recycling equipment. Remove compressor belt and loosen
mounting bolts. Rotate compressor in brackets until filler plug is at
top. Clean area around filler plug and remove plug slowly. Rotate
front hub plate so notch in lobe is 110 degrees from the bottom. This
rotates ball end of top piston to align with oil fill port and allows
clearance for dipstick. See Fig. 1.
2) Insert compressor dipstick diagonally from right to left
until stop on dipstick contacts filler plug surface. Remove dipstick
and note oil fill level. Each increment on dipstick represents one
ounce of oil. Add oil if necessary to reach 3-4 ounce level.
Fig. 1: Sanden 5-Cylinder Oil Level Checking
Courtesy of Sanden International U.S.A, Inc.
END OF ARTICLE
