Porsche 928 S4 – Owner’s Manual |
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Model Year 1987 From
the “Porsche 928 S4 Owner’s Manual”, available from 928 Specialists. |
The
transmission oil has to be changed at the intervals listed in your Maintenance
Schedule. Hypoid
oil SAE 75 W 90 labeled “For Service API/GL5 or Mil-L 2105B” must be used
for the manual transmission (also for limited slip differential). Also see “Filling Capacities”. We
recommend that you have the transmission oil changed at your Porsche dealer,
who has the required lubricants and the necessary filling equipment. If
you suspect an oil leak in the transmission, have your dealer check it out
immediately. The
torque converter and the transmission are lubricated with Automatic
Transmission Fluid (ATF). The
final drive requires hypoid oil SAE 90 only. Do not tow the car or run the engine without ATF in the transmission. The
automatic transmission may be damaged by even a tiny speck of dirt. Only a clean funnel or spout must be
used when adding ATF. Checking the ATF level The
ATF should be checked at the intervals listed in your Maintenance Schedule. A correct ATF level is very important
for the proper functioning of the transmission. The
reading should be done when the ATF is warm, with the engine idling, the
selector lever in Neutral and the parking brake applied. The
level of the ATF can be checked visually through the transparent reservoir,
located at the rear end of the transmission housing. You have enough ATF, if the fluid
level is between the MAX and the MIN mark on the reservoir. The level should never be above or
below these two marks. Should
the fluid level in the transparent reservoir drop below the MIN mark or rise
able the MAX mark, do not just add or drain ATF. Have your dealer check and correct the cause promptly. In the even of a noticeable loss of ATF, contact your dealer immediately. Changing the ATF The
ATF has to be changed at the intervals listed in your Maintenance Schedule. When refilling, the level must reach the
mark below the MIN mark.
Also see “Filling Capacities”. For
year round driving, anti-freeze is added at the factory for temperatures down
to: -23°F/-30°C
for U.S. -40°F/-40°C for Canada Because of its anti-corrosion properties,
anti-freeze should also remain in the cooling system for summer
operation. Cooling system
capacity and specified anti-freeze and water ratios are listed under “Filling Capacities”. Use any quality phosphate-free anti-freeze
containing ethylene-glycol, available at your Porsche dealer. Anti-freeze other than specified
by Porsche for aluminum engines and radiators may cause corrosion of the
cooling system, leading to engine overheating and damage. Only for topping up coolant, a small amount of
anti-freeze containing ethylene glycol and phosphates may be used if
recommended. The anti-corrosion properties and the anti-freeze
consistency will diminish gradually.
We recommend renewing the coolant mixture at least every 2 years. WARNING The cooling fans are electrically driven. They are switched on automatically
when the coolant reaches 80°C/176°F.
Even when the engine is turned off, the fan will continue running,
until the coolant temperature has dropped to 75°C/167°F and until the engine
itself has cooled down sufficiently. Checking coolant level in expansion tank
A
correctly functioning cooling system requires only minor care. The coolant level should be checked
from time to time, and always before going on a longer trip. The
expansion tank with filler cap opening is located in the right rear of
the engine compartment. Since
the expansion tank is transparent, it is not necessary to unscrew the filler
cap. When
the engine is cold, the coolant level should reach the manufacturing seam on
the expansion tank. When the
engine is warm, the coolant level will be above the manufacturing seam. Since
the closed cooling system loses almost no coolant, topping up is
normally no required. An obvious
loss of coolant indicates leakage.
In this case contact your dealer. WARNING
To
avoid damage to the engine, only add cold antifreeze and cold water to
the cooling system when the engine is also cold. A
warm engine should only be topped up if the coolant level has dropped
appreciable below the manufacturing seam. Too much added coolant will escape through the pressure cap
when coolant warms up. For
more details see “Coolant temperature gauge and
coolant temperature warning light”. Winter operation
At
the beginning of the winter season, have the coolant checked for anti-freeze
concentration. The
ratio between water and anti-freeze, necessary to prevent freezing, depends
on the anticipated outside temperatures. The ratios can be taken from the mixing chart listed under
“Filling Capacities” or from the container
of the antifreeze manufacturer. Increasing the anti-freeze in the coolant further than shown on the container is not only uneconomical, it is also detrimental to engine cooling. Bleeding cooling system If
more than about 1.1 U.S. qt. or 1 Liter must be added, the cooling system
should be bled.
Changing coolant
Tightening torques: radiator plug: 1.1-1.5 lb ft or 1.5-2.0 Nm crankcase drain plugs: 33-37 lb ft or 45-50 Nm
Cooling
air flaps and fan control These
devices permit the cooling output to be adapted to suit the operational
status of the engine. The
cooling air flap control operates a motor which actuates the flap mechanism
to alter the cross-section of the duct which directs the requisite volume of
cooling air over the engine. If
more air is needed, the speed of the two continuously adjustable electric
cooling fans is increased. The
cooling air flaps are located beneath the air scoop in the nose and can be
set to 3 positions by the actuating motor (0%, 30%, or 100% open). They begin to open when the coolant
temperature rises to approx. 80°C. As the temperature increases further,
fan speed increases and the flaps open wider. If the temperature of the coolant drops below 75°C, the
flaps close and the fans are switched off. A control unit processes the information it
receives from sensors in the engine compartment and passes the appropriate
signals to the fans and to the actuating motor. If a fault occurs the control unit set the flaps to 100%
open and the fans to maximum speed. If the actuating motor is defective, the flaps
can be operated manually by turning the knob on the actuating motor. Remove the rubber cap from the
actuating motor for manual operation. The system has both auto and remote
supervision. Should a component fail,
the coolant temperature warning light gives indication of excessively high
coolant temperatures. When the
engine is warm, the fans may continue to run after the ignition key has been
removed. To avoid any danger of
injury, the fans are switched off when the engine compartment hood is
opened. However, this protective
measure which prevents the fans starting suddenly while the hood is open only
remains completely operative as long as the key is not in the ignition. WARNING When the key is in the ignition, fan may come on at any time. When
the engine is cold, the cooling air flaps close when the ignition is switched
on. |
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