Specifications 91
COOLI NG SYSTEIVI
Radiator deslgn
Cross-flow gilled tube radiator with
header tan k; automatic transmission cars
with additional transmission oil cooler
in right-hand water compartment.
Pressure relief and underpressure
equalizing valve in header tank filler cap.
Opening pressure of cap valves:
overpressure , ±8:]3 bar
(14.2 ±?:| ib/in2)
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Fan
s blades, with Holset system viscous
coupling; automatic transmission cars
and cars with air conditioning (optional)
are equipped with an additional electric
fan.
Coolantthermostat
Themostatic control of engine coolant
circuit in feed pipe to engine, with
equalization of engine load amd outside
temperaturevariations(BMWsystem).
Opening commences: 80 ±i.5° C
(176 ± app. 3o F)
(M ixed temperature, representing
approx. 89 to 99° C (192-2|o° F) at
outlet from engine).
Oil cooler -BMW 633 Csi
Separate engine oil/air heat exchanger
below radiator, offset forwards.
CLUTCH
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vibration damper and automatic wear
compensation (manual gearbox cars);
fluid coupling with torque converter
(automatic transmission cars).
TFmNSwllssION
a) Manual gearbox:
Four-speed and reverse (optional: five-
speed gearbox) with Borg-Warner
synchromesh on all forward ratios.
b) Automatic transmjssion:
ZF 3 HP-22,
Transmissjon ratios
Manual gearbox
Automatic
4-speed 5-speed trans-
missjon
1st 3.855:1 3.720:1 2.478:1
2nd 2.203:1 2.400:1.1.478:1
3rd 1.402:1 1.765:1 1.000:1
4th 1.000:1 1.263:1 -
5th 1.000:1 -
Reverse 4.300:1 4.230:1 2.09:1
Torque conversion ratio
BMW 630 CSA, 633 CsiA: 1 -1.96 : 1
PFtopELLER SHAFT
Two-piece shaft; front section with joint
disc centered in guide journal, rear
section with universal joints at both ends.
Needle roller bearings, resilient center
bearing mount.
FI NAL DRIVE
Hypoid bevel, supported on
roller thrust bearings.
Ratio -BMW 630 CS
Crownwheel Number Tooth
and pinion ofteeth pattern
3.45: 1 38 : 11 Klingelnberg
or Gleason
Ratio -BMW 633 Csi
Crownwheel Number Tooth
and pjnion ofteeth pattern
3.25: 1 39 : 12 Klingelnberg
or Gleason
Optional: ZF `Lok-O-Matic' limited-slip
differential, approx. 25°/o locking action
Drive to rear wheels
Double universal joint halfshafts at left
and right, with no-maintenance homo-
kinetic constant velocity joints.
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