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Renewing valve stem oil seals with cylinder head installed >
< Removing and installing camshaft adjuster
A4 Cabriolet Mk2
Power unit
4-cylinder direct petrol injection engine (2.0 ltr. 4-valve turbo), mechanics
Engine cylinder head, valve gear
Servicing valve gear
Removing and installing camshafts
Removing and installing camshafts
Removing and installing camshafts
Special tools and workshop equipment required
t
Two-arm puller -T40001-
t
Counterhold tool -3036-
Removing
Note
t
Sealing surfaces at bottom of retaining frame and top of cylinder head may not be machined.
t
The camshaft bearings are integrated into the cylinder head and retaining frame. Toothed belt must be slackened before removing retaining frame.
t
Renew camshaft oil seal and sealing cap if retaining frame has been unfastened.
–
Remove cylinder head cover
→ Chapter
.
–
Remove camshaft adjuster
→ Chapter
.
–
Remove toothed belt
→ Chapter
.
–
Loosen camshaft sprocket using counterhold tool -3036-.
–
Use puller -T40001-, claw -T40001/6- and claw -T40001/7- to pull off camshaft sprocket.
–
Detach toothed belt cover (rear) from cylinder head.
–
Loosen retaining frame bolts evenly working from outside inwards and remove retaining frame.
–
Carefully lift out the camshafts and place them down on a clean surface.
–
Remove old sealant from groove in retaining frame and from sealing surfaces.
–
Make sure dirt and remnants of sealant do not drop into cylinder head.
Installing
l
Tightening torques
→ Chapter „Valve gear - exploded view“
→ Chapter „Cylinder head - exploded view“
Note
t
The sealing surfaces must be free of oil and grease.
t
Pistons must not be at TDC.
t
Ensure that all roller rocker fingers contact the valve ends correctly.
–
Lubricate running surfaces of the camshafts with oil.
–
Insert camshafts carefully in the camshaft bearings of cylinder head. Cams
-A-
of cylinder 4 must face each other.
–
Apply an even, slightly projecting sealant bead into the clean groove of the retaining frame.
For sealant refer to
→ Parts catalogue
.
Note
t
Do not apply the sealant thicker than prescribed.
t
No time should be allowed to elapse when fitting and securing retaining frame, as sealant starts to harden as soon as sealing surfaces make contact.
t
Note the use-by date of the sealant.
–
Fit retaining frame so that it goes past the exhaust gas recirculation valve -N18-
-arrow-
.
–
Tighten bolts securing retaining frame; tightening sequence
→ Fig.
.
–
Drive in cap
→ Item
approx. 1...2 mm deep using thrust piece -3334-.
–
–
Install camshaft oil seal
→ Chapter
.
–
Install toothed belt cover (rear).
–
Insert parallel key into camshaft.
–
Install camshaft sprocket. To tighten bolt, hold camshaft sprocket in position using counterhold tool -3036-.
Note
t
When turning the camshaft, the pistons must not be at TDC. This could otherwise result in damage to valves and pistons.
t
Make sure parallel key is correctly seated.
–
Install toothed belt
→ Chapter
.
–
Install camshaft adjuster
→ Chapter
.
–
Install cylinder head cover
→ Chapter
.
–
Install lock carrier with attachments
→ General body repairs, exterior; Rep. Gr.50
.
–
Allow stop for torque reaction support to rest on rubber buffer for torque reaction support under its own weight and tighten nuts
-arrows-
.
–
Install front bumper cover
→ General body repairs, exterior; Rep. Gr.63
.
–
Check headlight adjustment
→ Booklet803
.
Further assembly is basically carried out in reverse order of dismantling.
Power unit
4-cylinder direct petrol injection engine (2.0 ltr. 4-valve turbo), mechanics
Engine cylinder head, valve gear
Servicing valve gear
Removing and installing camshafts
Renewing valve stem oil seals with cylinder head installed >
< Removing and installing camshaft adjuster