AUDI A3 1998 8L / 1.G AEB ATW Engines Valvetrain Servicing Owner's Manual

15-48


Installing - Grease threaded head of 2085 seal puller, attach and with forced
pressure screw into oil seal as far as possible.
- Loosen knurled bolt and turn inner part against crankshaft until oil seal
is removed.
- Lightly oil lip of oil seal.

- Place 3241/2 guide sleeve on end of camshaft.
- Slide oil seal over guide sleeve.
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15-49


Note:
When installing ribbed belt, make sure it is seated correctly on the pulleys.
Tightening torques - Using 3241/3 camshaft fitting tool and 3241/1 pressure sleeve, press
oil seal in to stop.
- Install Camshaft Position (CMP) sensor -G40- Page 15
-38
.
- Install upper toothed belt cover.
- Install ribbed belt and ribbed belt tensioner Page 13
-15
.
Component
Tightening
torques
Shutter wheel for Camshaft Position (CMP) sensor -
G40- to camshaft 25 Nm (18 ft lb)
Housing for Camshaft Position (CMP) sensor -G40-
to cylinder head 10 Nm (7 ft lb)
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15-50

Camshafts and hydraulic chain
tensioner, removing and installing


Cylinder head installed
Lock carrier in service position Page 13
-1

Special tools and equipment

3036 retainer
3366 bracket-tensioner

Removing

- Remove ribbed belt and ribbed belt tensioner
Page 13
-15
.

- Remove engine covers.

- Remove upper toothed belt cover Page 13
-
29
.

- Turn crankshaft at central bolt of toothed belt gear in direction of engine
rotation to TDC Cyl. 1 marking (arrows).
- Remove cylinder head cover Page 15
-17
.
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CAUTION!
Before removing toothed belt, note direction of rotation with chalk or
felt-tip marker. Reversing the direction of rotation of a used belt can
destroy the belt.
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15-51


- Loosen tensioner (arrows) and remove toothed belt from camshaft
gear.
- Use 3036 retainer to loosen camshaft gear.
- Remove camshaft gear.
- Remove housing for Camshaft Position (CMP) sensor -G40-.
- Remove shutter wheel for Camshaft Position (CMP) sensor -G40-.

CAUTION!
If over-tightened, the chain tensioner will be damaged. - Secure hydraulic chain tensioner using 3366 bracket-tensioner.
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15-52

- Verify that camshafts are at TDC Cyl 1.

Both camshaft markings must align with arrows on bearing caps.
- Clean drive chain and camshaft chain gears opposite both arrows on
bearing caps. Mark installed position using paint.

Note:
Do not mark chain using punch, filing a notch or similar procedures.
The distance between the two arrows/paint marks is equivalent to
16 drive chain rollers.
The notch on the exhaust camshaft is slightly offset inward toward
drive chain roller (arrow-1-).
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15-53


Installing - First remove bearing caps -3- and -5- from intake and exhaust
camshafts.
- Remove double bearing cap.
- Remove both bearing caps from chain gears on intake and exhaust
camshafts.
- Remove hydraulic chain tensioner retaining bolts.
- Alternating in diagonal sequence, loosen bearing caps -2- and -4- of
intake and exhaust camshafts and remove.
- Remove intake and exhaust camshafts with hydraulic chain tensioner.

CAUTION!
Part numbers are listed here for reference only. Always check with
your Parts department for the latest information. - Replace rubber/metal chain tensioner gasket and spread sealant D 454
300 A2 on hatched surface.
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15-54
Install drive chain on camshaft chain gear as
follows:

- When installing old drive chain, line up paint markings (arrows).


If a new drive chain is installed, distance between notches -A- and
-B- on camshafts must equal the distance between 16 drive chain
rollers. Illustration shows where first and sixteenth drive chain
rollers must be installed on chain gears.
Notch -A- is slightly offset inward toward drive chain roller -1-.
- Slide in hydraulic chain tensioner between drive chain.
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15-55

- Install camshafts with drive chain and hydraulic
chain tensioner into cylinder head.

- Oil camshaft contact surfaces.

Note:

Alignment bushings for bearing caps and
hydraulic chain tensioner must be installed in
cylinder head.
When installing bearing caps, verify marking on
cap is readable from intake side of cylinder
head.

- Tighten hydraulic chain tensioner (pay attention
to alignment bushings).

- Tighten bearing caps -2- and -4- of intake and exhaust camshafts in
alternating diagonal sequence (pay attention to alignment bushings).
- Install both bearing caps on chain sprockets of intake and exhaust
camshafts.
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15-56

- Verify correct position of both camshafts.


Both camshaft markings must align with arrows on bearing caps
(arrows).


The distance between the two arrows/paint markings is equivalent
to 16 drive chain rollers.
The notch on exhaust camshaft is slightly offset inward toward
drive chain roller -1-.
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