Tightening torques for critical threaded connections (Audi 100 C3)

Four-cylinder engines

Cylinder head mounting bolts:
- Stage 1	40 (4,0)
- 2nd stage	60 (6,0)
- Stage 3	tighten further by half a turn (180°)
Bolts for fastening the engine mount brackets to the cylinder block:
– M10	45 (4,5)
– M8	25 (2,5)
Nut for fastening the timing belt tensioner mechanism shaft	45 (4,5)
Bolt for fastening the gear wheel to the intermediate shaft	80 (8,0)
Bolt securing crankshaft pulley to crankshaft gear shaft	20 (2,0)
Bolt securing crankshaft pulley to crankshaft gear shaft	20 (2,0)
Bolt for fastening the gear wheel to the crankshaft:
– cars produced before 1989.	200 (20,0)
– cars produced since 1989 (apply special glue):
• Stage 1	30 (3,0)
• Stage 2	tighten further by a quarter turn (90°)
Bolt for fastening the toothed wheel to the camshaft	80 (8,0)
Camshaft Bearing Cap Nuts	20 (2,0)
Bolt securing cover to cylinder head	10 (1,0)
Connecting rod bearing cap fastening nut:
- Stage 1	30 (3,0)
- 2nd stage	tighten further by a quarter turn (90°)
Intermediate shaft oil seal flange mounting bolt	25 (2,5)
Front crankshaft oil seal cover fastening bolt	20 (2,0)
Crankshaft rear oil seal cover mounting bolt	10 (1,0)
Flywheel mounting bolt (drive disk)	100 (10,0)
Oil filter mounting bolt	25 (2,5)
Oil pump mounting bolt	20 (2,0)
Oil pump cover mounting bolt	10 (1,0)
Crankcase mounting bolt	20 (2,0)

Cylinder head mounting bolt:
- Stage 1	40 (4,0)
- 2nd stage	60 (6,0)
- Stage 3	tighten further by half a turn (180°)
Bolts for fastening the engine mount brackets to the cylinder block:
– M8	25 (2,5)
– M10	45 (4,5)
Water pump mounting bolt	20 (2,0)
Crankshaft pulley mounting bolt	350 (35,0)
Bolt for fastening the toothed wheel to the camshaft	80 (8,0)
Camshaft Bearing Cap Fastening Nuts	20 (2,0)
Cylinder head cover mounting bolt	10 (1,0)
Main bearing cap mounting bolt	65 (6,5)
Connecting rod bearing cap fastening nuts:
- nut with washer	50 (5,0)
- slotted nut:
• Stage 1	30 (3,0)
• Stage 2	tighten further by a quarter turn (90°)
Crankshaft rear oil seal cover mounting bolt	10 (1,0)
Oil pump mounting bolts:
- short bolts and stand	10 (1,0)
- long bolts	20 (2,0)
Idler pulley mounting bolt	10 (1,0)
Pressure reducing valve	40 (4,0)
Oil filter mounting bolt (turbocharged engine)	70 (7,0)
Oil supply and drain pipe flanges (turbocharged engine)	25 (2,5)
Oil cooler hose coupling connection nuts (engine turbocharged)	40 (4,0)
Crankcase mounting bolt	25 (2,5)

Radiator mounting nuts (except for the upper bracket of the five-cylinder engine)	20 (2,0)
Radiator mounting nut to the upper bracket (five-cylinder engine)	10 (1,0)
Electric Fan Fastening Nuts	10 (1,0)
Thermostat cover mounting bolt	10 (1,0)

Fuel tank mounting bolt	25 (2,5)
Fuel pump mounting bolt (four-cylinder engine)	20 (2,0)
Intake manifold mounting nut	25 (2,5)
Carburetor mounting nut	10 (1,0)
Exhaust manifold mounting nut:
- four-cylinder engine	25 (2,5)
- five-cylinder engine	30 (3,0)
Turbocharger mounting nut	60 (6,0)
Intermediate turbocharger shut-off valve fastening nut pipes	25 (2,5)
Nut for fastening the exhaust pipe	35 (3,5)

Spark plug	20 (2,0)
Nut or bolt for securing the distributor bracket	15 (1,5)

Clutch housing to flywheel mounting bolt	25 (2,5)
Bolts securing the clutch housing to the engine block:
- cars with four-cylinder engines	55 (5,5)
– cars with five-cylinder engines:
• m12 bolts	60 (6,0)
• m10 bolts	45 (4,5)
• m8 bolts	20 (2,0)
Pressure plate mounting bolt	25 (2,5)
Clutch release fork mounting bolt	25 (2,5)
Release bearing guide sleeve mounting bolt	15 (1,5)
Master cylinder mounting bolt	25 (2,5)

Bolt for fastening the gearbox supports to the body:
– mod. 013 and 014	45 (4,5)
– mod. 093, 016 and automatic	40 (4,0)
Bolt for fastening supports to gearbox	40 (4,0)
Nuts of the bolt securing the suspension bracket to the gearbox housing transmission	25 (2,5)
Front drive shaft inner joint mounting bolts wheels to differential output shaft	45 (4,5)
Gearbox housing to clutch housing mounting bolt	25 (2,5)
Differential cover mounting bolt	25 (2,5)
Differential output shaft mounting bolt	20 (2,0)
Reverse gear lever axle mounting bolt	35 (3,5)
Secondary shaft rear end nut	100 (10,0)
Nut securing gear shift mechanism to body floor	10 (1,0)

Shock absorber strut to upper support mounting nut	30 (3,0)
Upper support mounting nut	30 (3,0)
Strut piston lock nut	60 (6,0)
Threaded rack cap	180 (18,0)
Nut for fastening the rack to the ball joint	65 (6,5)
Front suspension arm to subframe mounting bolt	85 (8,5)
Subframe to body mounting bolt	110 (11,0)
Anti-roll bar to control arm mounting nut front suspension	110 (11,0)
Nut for fastening the hub to the axle shaft	280 (28,0)
Bolt for fastening the axle shaft to the gearbox flange:
- bolt M8	45 (4,5)
– bolt M10	80 (8,0)
Transverse tie rod mounting nut	90 (9,0)
Rear suspension arm to body mounting bolt	95 (9,5)
Rear shock absorber lower mounting nut	90 (9,0)
Rear shock absorber upper mounting nut	20 (2,0)

Steering wheel mounting nut	40 (4,0)
Steering shaft to rack pinion fastening nut	25 (2,5)
Steering column mounting nut	35 (3,5)
Nut for fastening the rack housing to the body	25 (2,5)
Steering rod to rack mounting bolt	60 (6,0)
Steering tie rod ball joint mounting nut	60 (6,0)
Power steering pump mounting nut:
- four-cylinder engine	25 (2,5)
- five-cylinder engine	20 (2,0)
Power steering pump pulley mounting nut	20 (2,0)

Front Brake Caliper Bolt (Girling)	35 (3,5)
Guide pin (Teves)	25 (2,5)
Bolt securing the front brake mechanism to the shield	125 (12,5)
Rear brake caliper mounting bolt	65 (6,5)
Drum brake shield mounting bolt	30 (3,0)
Master cylinder to booster mounting nut	25 (2,5)
Nut for fastening the amplifier to the body	25 (2,5)