- •Technical specifications
- •924 Models 78-85
- •925 Turbo models79-84
- •924 Carrera gt models 81
- •Electrical system
- •Important Conversion Factors and New Dimensioning Units
- •Survey of Type Designations
- •1. Chassis no. Codes (10-digit)
- •Intake valve seat Exhaust valve seat
- •Valve Dimensions
- •924 Turbo
- •924 924 Turbo
- •924 Up to model 79 Rims Tires
- •Tightening torques
- •924 Turbo
924 924 Turbo
front 2.0bar(29psi) front 2.0bar(29psi)
rear 2.0bar(29psi) rear 2.5bar(36psi)
Spare wheel 2.2bar(32psi) Spare wheel 2.2bar(32psi)
924 Up to model 79 Rims Tires
Front and rear 51½Jx14 165 HR 14
from model 79 6Jx14 185/70 HR 14
924 turbo from model 79
front and rear 6Jx15 185/70 VR 1572
Wheel Alignment Adjustment Values 924/924 turbo
The following values apply to curb weight in accordance with DIN 70020 (car with full fuel tank, spare tire and tool kit)
|
Adjustment value and tolerance |
Max. difference left to right |
Front axle Toe-in (pressed with 150 N/15 kp) |
+10'±5' |
|
Track difference angle at 20' lock |
-40' to -1º50' |
may be affected only by replace-ment of steering arms |
Camber |
-20'±15' |
10' |
Caster |
+30’ 2°30' -15’ |
30' |
Rear axle Toe-in per wheel |
0°±5' |
10' |
Camber |
-25'±30' (-1°±20') |
30' |
Spring strut adjustment* (angle of spring strut) Up to end of model 77 From model 78 |
23° |
0.5° |
With Ø 22 mm torsion bar |
23°40' |
0.5° |
With Ø 23.5 mm torsion bar Application of Ø 23.5 mm torsion bar: in conjunction with Ø 14 mm stabilizer from model 81, all USA, Canada, Japan models from chassis no. 92А0 43 0199 (Sept. 79) |
19° |
0.5° |
Vertical adjustment** (from model 78) Center of strut bearing (torsion bar center) under wheel center |
Adjustment value and tolerance 3.5 ± 10 mm (8 ±10 mm) |
Max. difference left to right 10 mm 10 mm |
Specifications for USA, Canada, Japan in brackets
* 1' change in spring strut angle corresponds to approx. 6 mm change in vehicle height with 22 mm torsion bar 5mm change in vehicle height with 23.5 mm torsion bar
** For USA, Canada, Japan this figure may vary slightly. The important factor is
the bumper height. The distance from the measuring platform (level road . surface) to top edge of bumper must be 522 ± 20 mm.
Brakes
Torque Specifications-Mechanical Brake System 924/924 turbo
Location |
Thread |
Tightening torque Nm (ftib) |
Fillister head screw to damping nut |
M7 |
13+3(10+2) |
Floating caliper to steering knuckle |
M12x1.5 |
85 (63) |
Brake disk to wheel hub |
M8 |
23(17) |
Cover plate to steering knuckle |
M7 |
10(7.5) |
Wheel hub to rear wheel shaft Brake drum to rear wheel shaft |
M24x1.5 M24x1.5 |
380 + 70 (280 + 52) 350 ± 50 (258 ± 37) |
Mounting bracket for brake line to brake carrier |
М6 |
10(7.5) |
Cover plate to brake carrier |
М6 |
10(7.5) |
Brake disk to wheel hub |
М6 |
5(4) |
Floating caliper to brake carrier |
M12x1.5 |
85 (63) |
Cover plate to axle control arm |
M10 |
58(43) |
Handbrake lever to body |
M8 |
21 (15) |
Brake cable to yoke |
М6 |
8.5 (6) |
Handbrake cable to tumbuckle |
М6 |
8.5 (6) |
Brake cable bracket to brake carrier |
M8 |
21 (15) |
Wheel brake cylinder to brake carrier |
M8 |
21 (15) |
Torque Specifications-Hydraulic Brake System 924/924 turbo
Location |
Thread |
Tightening torque Nm (ft lb) |
Brake pressure line to tandem master brake cylinder, brake hose, distributor, wheel brake cylinder and floating caliper |
M10x1 |
14(10) |
Brake hose to floating caliper |
M10x1 |
14(10) |
Bleed screw to floating caliper |
M7 |
4(3) |
Bleed screw to wheel brake cylinder |
M6 |
4(3) |
Brake light switch to tandem master brake cylinder |
M10x1 conical |
15+4(11+3) |
Screw plug to master brake cylinder |
M10xl |
14(10) |
Tandem master brake cylinder to brake booster |
M8 |
21 ( 15) |
Brake booster to intermediate piece |
M8 |
21 (15) |
Brake booster to bulkhead |
M8 |
21 (15) |
Mounting bracket to brake carrier |
M6 |
10(7.5) |
Technical Data - Brake System 924
Designation |
Remarks Dimensions |
Wear limit |
Service brake (toot brake) |
Hydraulic dual-circuit brake system, split up diagonally, brake booster, front wheels with sliding caliper disk brakes, rear wheels with simplex drum brakes |
|
Handbrake (parking brake) |
acting mechanically on both rear wheels |
|
Brake disk Ø |
257mm |
|
Effective brake disk Ø |
210mm |
|
Brake disk thickness, new |
13mm |
|
Min. thickness after reworking*) |
12mm |
11.5mm |
Effective total brake lining area |
470 cm2 |
|
Brake lining area per front wheel |
65 cm2 |
|
Brake lining area per rear wheel |
170 cm2 |
|
Piston Ø in brake caliper |
48 mm |
|
Uning thickness front |
14 mm 2.0 mm |
|
Brake drum Ø |
230mm |
|
Min. Ø after reworking **) |
231 mm 231.5mm |
|
Brake shoe width |
38.6mm |
|
Brake lining thickness |
3.8...4.0 mm 2.5 mm |
|
Brake lining thickness, oversize |
4.3...4.5 mm 2.5 mm |
|
Piston Ø rear wheel brake cylinders |
19.05 mm |
|
Master brake cylinder Ø up to mod. 80 from mod. 80 |
20.64 mm 23.81 mm |
|
Brake booster up to mod. 80 from mod. 80 |
7 inches 9 inches |
|
*The brake disk must only be reworked syrnmetrically, i.e. from both sides equally |
**Use oversize brake linings |
|
Technical Data - Brake System 924 turbo/Carrera GT
Designation |
Carrera GT 924 turbo Rest of World (USA, Canada, Japan-opt. extra) Remarks |
924 turbo USA, Canada, Japan-Basic model (from mod. 81 see RoW), dimensions |
Carrera GT 924 turbo Rest of World (USA, Canada, Japan-opt. extra) |
924 turbo USA, Canada Japan-Basic model (from mod. 81 see RoW) Wear limit |
||
Service brake (footbrake) |
Hydraulic dual-circuit brake system with brake booster |
|
||||
|
Internally ventilated brake disks with sliding calipers front and rear. On Carrera GT additional ventilation via one airduct each side |
Front wheels with sliding caliper disk brakes, rear wheels with Simplex drum brakes. |
|
|
||
|
Remarks, Dimensions |
Wear limit |
|||
Brake circuit split
Brake booster Ø Master brake cylinder Ø
Brake disk Ø Front Rear Brake drum Ø Effective Brake disk Ø Front Rear
|
924 turbo: Diagonal Carrera GT: front/rear (black/white) 9 inches Internal ratio i=3.0 924 turbo: Tandem 23.81 mm Carrera GT: Tandem stepbore 23.81/19.05 mm 282.5 mm 289.0 mm -
224.6 mm 242.0 mm
|
Diagonal
9 inches Internal ratio i=3.0 Tandem 23.81 mm
257.0 mm - 230 mm
210 mm -
|
|
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Piston Ø in brake caliper Front Rear Piston Ø rear wheel brake cylinders Brake lining area per front wheel Brake lining area per rear wheel Total brake lining area Lining thickness Front Rear Lining thickness, oversize Brake disk thickness, new Front Rear Min. Brake disk thickness after reworking Front Rear Thickness tolerance of brake disk max. Max. Lateral runout of brake disk. Max. Lateral runout when installed Brake drum Ø new Min. Brake drum Ø after reworking Max peak-to-valley height after machining Play at brake pedal when brakes bled and engine not running |
54mm 36mm -
92cm2 63 cm2 310 cm2
13mm 13mm -
20.5 mm 20.0 mm
19.1 mm 19.2 mm
0.02 mm
0.05 mm
0.1mm -
-
0.006mm
min 10mm
|
48mm - 19.05 mm
65 cm2 170 cm2 470 cm2
14mm 3.8...4.0 mm 4.3...4.5 mm
13mm -
12mm -
0.03 mm
0.05 mm
0.2mm 230mm -
231mm -
0.006mm
min 10mm
|
2mm 2mm -
18.5mm 18.6mm
231.5mm
|
2 mm 2.5mm 2.5mm
11.5mm -
|
|
*The brake disk must only be reworked symmetrically, i.e. from both sides equally. "Use oversize brake linings Parking brake Drum brake acting mechanically on both rear wheels (handbrake) |
|||||
Handbrake drum Brake shoe width Brake lining area per wheel Brake lining thickness) |
180mm 230mm 25 mm 38.6 mm 85 cm2 170 cm2 4.5 mm 3.8...4.0 mm (Oversize 4.3...4.5 mm
|
181mm 231.5mm
2 mm 2.5 mm
|
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Technical Data - Air Conditioning from model 79
Refrigerant volume 850 g R 12 refrigerant
Refrigerating oil in compressor
230 ± 15 cm3 Densoil 6 (up to model 78 175 cm3
or Suniso No. 5 GS
or Texaco Capella "E"
or Fuchs Reniso Kes
or refrigerating oil of identical specifications
Power consumption
Evaporator fan 160 ± 20 W
Magnetic clutch 40 W
Temperature regulation
Temperature for cut-in/cut-out of magnetic clutch, air temperature measured at evaporator outlet.
|
Max. Cooling capacity |
Min. cooling capacity |
On |
4 ± 1.5° С |
18±1.5°C |
Off |
3±1.5°C |
15±1.5°C |
Compressor
No. of cylinders 6
Swept volume 134 cm3 рег revolution
Weight 8.4 kg
Fusible safety plug on fluid reservoir
The safety plug fuses open at 103º С to 110° С, corresponding to an overpressure of 35 to 40 bar.
Low pressure switch on fluid reservoir The contact is open at an overpressure of under 2.2 bar
Thread sizes on the air conditioning components
Component |
Thread in inches (U Inlet |
NF) Outlet |
Connection for checking |
Compressor Condenser Fluid reservoir Evaporator |
7/8 3/4 5/8 5/8 |
3/4 5/8 5/8 7/8 |
7/16 |