Engine specifications (Audi A6 C4)

General characteristics

Engine code
2226 cm³, Motronic injection system, 169 kW	AAN
2309 cm³, Bosch KEIII Jetronic injection system, 98 kW	AAR
Cylinder diameter	82.5 mm
Piston stroke	86.4 mm
Compression ratio	10,0:1
Compression pressure	8.0 bar
Maximum pressure difference between cylinders	3.0 bar
Cylinder firing order	1–2–4–5–3
Location of cylinder N1	From the timing belt side
Lubrication system:
Oil pump type	It is fixed to the front of the cylinder block and receives crankshaft drive
Nominal oil pressure	2.0 bar minimum (2000 rpm, oil temperature 80°)

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°
A flywheel consisting 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