Engine specifications (Audi A6 C4)

General characteristics

Engine code:
1781 cm³, Bosch Motronic 3.2 injection system, 92 kW	ADR
1984 cm³, Bosch Mono-Motronic injection system, 74 kW	AAE
1984 cm³, Bosch KE-Motronic injection system, 103 kW	ACE
1984 cm³, Volkswagen Digifant injection system, 85 kW	ABK
1984 cm³, Bosch KE-Motronic injection system, 85 kW	AAD
Cylinder diameter:
ADR	81.0 mm
AAE, ACE, ABK, AAD	82.5 mm
Piston stroke:
ADR	86.4 mm
AAE, ACE, ABK, AAD	92.8 mm
Compression ratio:
ADR	10,3:1
AAE	9,0:1
ACE	10,8:1
ABK	10,5:1
AAD	10,4:1
Compression pressure:
ADR	7.5 bar
AAE, ACE, ABK, AAD	7.0 bar
Maximum pressure difference between cylinders	3.0 bar
Cylinder firing order	1–3–4–2
Location of cylinder N1	From the timing belt side
Lubrication system
Oil pump	Intermediate shaft drive
Working oil pressure:
ADR	3.0 – 5.0 bar (3000 rpm, oil temperature 80°)
AAE, ACE, ABK, AAD	2.0 bar minimum (2000 rpm, oil temperature 80°)
Clearance between pump gears	0.2 mm
Pump axial clearance	0.15 mm

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
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 fastening the engine support 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
Timing Belt Tensioner:
Locking bolt	20
Fastening nut	10

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