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C5 Allroad (1999-2005) C5 (1997-2004) C4 (1994-1997)

Tightening torques for threaded connections (Audi A6 C4)

  • Home
  • Audi A6
  • C4 (1994-1997)
  • Engine repair
  • Removal and reassembly
  • Tightening torques for threaded connections
            0

Tightening torques, Nm



ADR engine
Bolts securing the air compressor drive belt tensioner air conditioner
20
Bolts securing the generator to the cylinder head
20
Generator adjusting bolt
35
Connecting rod cap bolts and nuts:
– step 1
30
– step 2
Tighten another 90°
Bolts securing camshaft bearing caps
10
Camshaft cover nuts
10
Camshaft Sprocket Bolt
100
Bolts securing the coolant pump pulley halves
25
Engine crankcase ventilation air outlet
20
Front crankshaft oil seal housing:
– M6 bolts
10
– M8 bolts
25
Crankshaft rear oil seal housing:
– M6 bolts
10
– M8 bolts
20
Crankshaft Sprocket Bolt:
- step 1
90
- step 2
Tighten another 90°
Cylinder head bolts:
- step 1
60
- step 2
Tighten another 180°
Drive Disc Bolts:
- step 1
60
- step 2
Tighten another 90°
Exhaust manifold bolts
25
Flywheel bolts:
- step 1
60
- step 2
Tighten another 180°
Bolts securing the Hall sensor plate to the intake manifold
25
Bolts securing the Hall sensor to the cylinder head
10
Intake Manifold Bolts
10
Intermediate shaft flange
25
Intermediate shaft sprocket
100
Main bearing cap bolts:
- step 1
65
- step 2
Tighten another 90°
Oil filter
25
Oil pan retaining bolts
20
Timing Belt Tensioner Locking Bolt
25
Timing Belt Tensioner Mounting Bolt
20
All engines except ADR
Bolts securing the air compressor drive belt tensioner air conditioner
20
Compressor Pulley Bolts
20
Bolts securing the compressor to the air conditioner housing
25
Generator adjusting bolt
35
Bolts securing the generator to the cylinder head
20
Connecting rod cap bolts and nuts:
- step 1
30
- step 2
Tighten another 90°
Bolts securing camshaft bearing caps
20
Camshaft cover nuts
10
Coolant Pump Pulley Bolts
20
Engine crankcase ventilation air outlet
20
All engines except ADR
Front crankshaft oil seal housing:
– M6 bolts
10
– M8 bolts
25
Crankshaft rear oil seal housing:
– M6 bolts
10
– M8 bolts
20
Crankshaft Sprocket Bolt:
- step 1
90
- step 2
Tighten another 180°
Cylinder head bolts:
- step 1
40
- step 2
60
- step 3
Tighten another 180°
Cylinder head exhaust port
10
Engine Lifting Eye Bolts
20
Bolts securing the engine mount to the body
45
Bolts securing the engine bracket to the support
40
Bolts securing the exhaust pipe to the manifold
35
Flywheel bolts:
- step 1
30
- step 2
Tighten another 90°
Bolts securing the Hall sensor plate to the intake manifold
25
Bolts securing the Hall sensor to the cylinder head
10
Intermediate shaft flange bolts
25
Intermediate shaft sprocket bolts
80
Main bearing cap bolts
65
Oil filter
25
Oil pump cover bolts
10
Oil pump bolts
20
Oil temperature sensor
10
Power Steering Pump Bolts
20
Oil pan bolts
20
Timing Belt Cover Bolts
10
Rear Timing Belt Cover Bolts
20
Timing Belt Tensioner:
Locking bolt
20
Fastening nut
10
AAN, AAR engines
Connecting rod cap bolts and nuts:
- step 1
30
- step 2
Tighten another 90°
Camshaft Bearing Cap Bolts
20
Camshaft Cover Bolts:
- step 1
5
- step 2
10
- step 3
12
Camshaft Sprocket Bolt
65
Engine crankcase ventilation channel
20
Crankshaft Sprocket and Pulley Bolt
450
Bolts securing the crankshaft pulley and shock absorber to the sprocket
20
Crankshaft Rear Oil Seal Housing Bolts:
– M6
10
– M8
20
Cylinder oil jet
10
Cylinder head bolts:
- step 1
40
- step 2
60
- step 3
Tighten another 180°
Engine mount bolts
45
Bolts securing the exhaust pipe to the manifold
40
Exhaust manifold bolts
25
Flywheel bolts:
Standard flywheel:
- step 1
30
- step 2
Tighten another 90°
The flywheel consists of two parts:
- step 1
40
- step 2
Tighten another 180°
Bolts securing the Hall sensor plate to the intake manifold
25
Bolts securing the Hall sensor to the cylinder head
10
Main Bearing Cap Bolts
65
Intake Manifold Bolts
20
Oil filter
25
Oil intake pipe
10
Bolts securing the oil pump to the cylinder block:
- short
10
- long
20
Oil pan bolts:
– M6
10
– M8
20
Oil pan plug
40
Engine mount bolts
40
Timing Belt Cover Bolts
10
Timing Belt Tensioner Bolts
20
Fan
20
Engines 1Z, AHU
Bolts securing the generator and air compressor bracket air conditioner to cylinder block
25
Bolts securing the compressor to the bracket
20
Generator bolt
25
Bolts securing the auxiliary belt lever to the tensioner
10
Bolts securing the additional belt tensioner
25
Connecting rod cap bolts and nuts:
- step 1
30
- step 2
Tighten another 90°
Camshaft Bearing Cap Bolts
20
Camshaft Cover Bolts
10
First camshaft bearing cap bolts
20
Camshaft Sprocket Bolt
45
Water pump pulley bolt
25
Bolts securing the water pump to the cylinder block:
- step 1
20
- step 2
Tighten another 90°
Engine crankcase ventilation channel
20
Crankshaft Front Oil Seal Housing Bolts:
– M6
10
– M8
25
Bolts securing the crankshaft pulley and shock absorber to the sprocket
25
Crankshaft Rear Oil Seal Housing Bolts:
– M6
10
– M8
20
Crankshaft Sprocket Bolt:
- step 1
90
- step 2
Tighten another 90°
Cylinder head bolts:
- step 1
40
- step 2
60
- step 3
Tighten another 90°
Engine intermediate plate bolts
10
Bolts securing engine lifting lugs to cylinder head
20
Engine Top Cover Bolts
5
Bolts securing the exhaust pipe to the turbocharger
25
Flywheel bolts:
- step 1
60
- step 2
Tighten another 90°
Bolts securing the Hall sensor plate to the intake manifold
25
Bolts securing the Hall sensor to the cylinder head
10
Intermediate shaft flange
25
Intermediate shaft sprocket
45
Main bearing cap bolts:
- step 1
65
- step 2
Tighten another 90°
Oil cooler bolts
25
Oil filter
25
Oil pump cover bolts
10
Oil pump bolt
25
Power Steering Pump Pulley Bolts
25
Bolts securing the speed sensor to the crankshaft:
- step 1
10
- step 2
Tighten another 90°
Oil pickup pipe bolts
10
Oil pan bolts
20
Inner Timing Belt Cover Bolts
10
Lower Outer Timing Belt Cover Bolts
10
Tensioner Nut
20
Bolts securing the top cover to the engine
5
Bolts securing the torque converter to the drive disc
35
Bolts securing the cover and gearbox bracket to the block cylinders
45
Vacuum pump bolts
20
Engines ABP, AAT, AEL AAS
Bolts securing the generator to the bracket
45
Drive Belt Tensioner Bolts
20
Connecting rod cap bolts and nuts:
- step 1
30
- step 2
Tighten another 90°
Bolts securing the brake vacuum pump to the cylinder head:
ABP, AAT, AEL
10
AAS
20
Camshaft Bearing Cap Bolts
20
Camshaft Cover Bolts
10
Bolts securing the front and rear camshaft bearing caps shaft
20
Camshaft Sprocket Bolt:
ABP, AAT, AEL:
- step 1
30
- step 2
Tighten another 90°
AS:
– bolt 8.8
85
– bolt 10.9:
• step 1
30
• step 2
Tighten another 90°
Engine crankcase ventilation channel
20
Ventilation duct (ABP, AAT, AEL)
10
Crankshaft Pulley Bolt:
ABP, AAT, AEL release before 11/94:
- step 1
160
- step 2
Tighten another 180°
ABP, AAT, AEL release after 11/94:
- step 1
220
- step 2
Tighten another 270°
ASS
450
Crankshaft rear oil seal housing:
– M6
10
– M8
20
Cylinder oil jet
10
Cylinder head bolts:
- step 1
40
- step 2
60
- step 3
Tighten another 180°
- step 4
Warm up the engine
- step 5
Tighten another 90°
- step 6 (only ABP)
Tighten another 90° after 1000 km
Bolts securing the exhaust pipe to the manifold (AAS)
40
Bolts securing the exhaust pipe to the turbocharger (ABP, AAT, AEL)
40
Flywheel bolts:
- step 1
30
- step 2
Tighten another 90°
Front suspension cross member bolts:
– step 1:
• AAS
110
• ABP, AAT, AEL
100
- step 2
Tighten another 90°
Bolts securing the fuel pump bracket to the cylinder block (AAS)
50
Fuel pump drive belt cover bolts:
To the cylinder head
20
To the fuel pump
10
Bolt of the sprocket transmitting the drive to the fuel pump:
ABP, AAT, AEL
100
AAS
160
Fuel pump sprocket bolt
50
Bolts securing fuel pump to bracket (AAS)
25
Bolts securing the Hall sensor plate to the intake manifold
25
Bolts securing the Hall sensor to the cylinder head
10
Main Bearing Cap Bolts:
AAS
65
ABP, AAT, AEL:
- step 1
30
- step 2
Tighten another 90°
Oil filter
Oil pump pressure reducing valve:
Plug without temperature sensor
40
Plug with temperature sensor
30
Oil pump bolts
20
Bolts securing the oil pickup pipe to the pump and cylinder block
10
Bolts securing the power steering pump to the bracket
20
Oil pan bolts
20
Timing Belt Idler Pulley
10
Inner Timing Belt Cover Bolts
10
Outer Timing Belt Cover Bolts
20
Belt tensioner nut
Cooling Fan Mounting Bolts
10
Fan bolts
20
The article was checked by auto expert Georgy Rodionov
This article is available at russian, bulgarian, belarusian, ukrainian, serbian, croatian, romanian, polish, slovak, hungarian

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Audi A6 C4: Removal and reassembly
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Engine codes and their specifications
Repair work possible without dismantling the engine
General notes on major repairs
Options for carrying out major repairs
Engine dismantling


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A6(C5 AR, 1999-2005) 
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A6(C5, 1997-2004) 
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  • Fuel system (diesel)
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A6(C4, 1994-1997) 
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  • Gasoline engines
  • 4 cylinder engines
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  • Power devices
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