1998 AUDI A4 light

15-2


1 -
Double bearing cap
Lightly coat with sealant 454 300 A2 before
installing from Page Page 15
-16

2 -
Exhaust camshaft bearing cap
With connection for oil feed lineWatch position of dowel sleeveNote installation position and numbering
Page 15
-75

Lightly coat last bearing cap (after the
chain) with sealant D 454 300 A2 before
installing
3 -
10 Nm
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15-71

- Disconnect connector from solenoid valve.

If specified value is not obtained:
Checking voltage supply - Connect multimeter at valve for resistance measurement.

Specified value: 10 ... 18
- Replace valve.
- Disconnect connector from solenoid valve.

If LED does not light: - Connect VAG 1527B voltage tester as follows:Harness connector
terminal
Measure to
1 Engine Ground (GND)
- Operate starter briefly.

LED must light.
- Perform following tests marked with dots:
Check fuse of solenoid valves for camshaft adjustment.
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15-78


Note:
The two markings on the camshafts must be in line with the two arrows on
the bearing caps.
Notes: - Check TDC position of camshafts once again.
- Clean drive chain and camshaft chain sprockets in vicinity of arrows on
bearing caps and mark position of chain on sprockets with paint
opposite two arrows.

The distance between the two arrows (and thus between the paint
markings) is 16 rollers on the chain. The notch on the exhaust camshaft is offset slightly towards the inside
in relation to chain roller -1-. Do not mark the chain with a center punch or by making a notch or
similar.
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15-80

- Install drive chain on camshaft sprockets as
follows:


When the old chain is being used again, install the chain so that
the paint markings (arrow) are in line.


When a new chain is being installed, the distance between the
notches -A- and -B- on the camshafts must be 16 rollers on the
chain. The illustration shows the exact positions of the 1st and 16th
rollers on the sprockets.
Notch -A- is offset slightly towards the inside in relation to chain
roller -1-.
- Insert camshaft adjuster inside chain (second mechanic required).
- Locate camshafts with chain and camshaft adjuster in cylinder head.
- Oil camshaft bearing surfaces.
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15-82

- Check correct setting of camshafts:


The two markings on the camshafts must be in line with the two
arrows on the bearing caps -arrows-.


The distance between the two arrows on the bearing caps (or
between the paint markings) is 16 rollers on the chain.
The notch on the exhaust camshaft is offset slightly towards the
inside in relation to chain roller -1-.
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15-90

Valve stem seals, replacing


Cylinder head installed

- Remove ribbed belt Page 13
-1 .

- Remove toothed belt Page 13
-4 .

- Remove camshafts Page 15
-75
.

- Remove lifters and put them down with the
contact surface downwards. Ensure that lifters
are not interchanged.

- Remove spark plugs.

- Set piston of relevant cylinder to bottom dead
center (BDC).

Note:
Tight cotters can be released by tapping lightly
on the valve lever with a hammer.
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15-92


Inlet side
Note:
The inlet valves are installed in the cylinder head at different angles. - To prevent damage to the new valve stem seals, place plastic sleeve -
A- on the valve stem.
- Lightly oil sealing lip.
- Insert valve stem seal -B- (without oiling outside of seal) into installing
tool 3129 and carefully push it down onto the valve guide.
- When installing new valves, lightly oil valve stems before installing.

Valve spring compressor 3362 can be set accordingly to two different
positions:
1 - Upper position for center valve
2 - Lower position for the two outer valves
3 - Threads on each side to take M6 x 25 bolts for securing spring
compressor to cylinder head
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15-94


Reworking valves
Valves must not be reworked. Only grinding-in (lapping) is permitted.
WARNING!
Note precautions required when disposing of sodium-cooled
exhaust valves Page 15
-87
. - To prevent damage to new valve stem seals, place plastic sleeve -A-
on valve stem.
- Lightly lubricate sealing lip with oil.
- Insert valve stem seal -B- (without oiling outside of seal) into installing
tool 3365 and carefully push it down onto valve guide.
- When installing new valves, lightly oil valve stems before installing.
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