belt AUDI A4 1998 B5 / 1.G APB Engine Valve Gear Service User Guide

15-48


Note:
The central bolt does not have to be loosened to remove the vibration
damper. - Remove vibration damper on crankshaft.

- Remove idler wheel for ribbed belt -arrows-.
- Remove toothed belt guard behind vibration damper -arrows-.
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15-49

Notes:

Mark the direction of rotation of the toothed belt
with chalk or felt pen before removing. A used
belt can break if it rotates in the wrong direction
when reinstalled.
The toothed belt tensioning element is oil-
damped and can therefore only be compressed
slowly by applying constant pressure.

- Using a hexagon key, turn toothed belt tensioning roller -1- clockwise 8
mm in direction of arrow until tensioning lever -2- compresses
tensioning element -3- sufficiently to enable a 2mm dia. spring pin to be
installed in drilling and in plunger.
- Insert spring pin and release toothed belt tensioning roller.
Use spring pin from 2024 A.
- Insert camshaft clamp 3391 in the securing plates of the two
camshafts.
- Loosen both camshaft bolts and remove approx. 5 turns.
- Take out camshaft clamp 3391.

- Pull off both camshaft sprockets with special tool T40001.
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15-50


- Unbolt rear right toothed belt guard -arrows-.
- Detach intake manifold using special tool 3249.

- Unbolt water line -1- and pull it towards the rear.
- Unbolt bracket -2- from cylinder head.
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15-55


Tightening torques - Seal end points of joints between bearing caps and cylinder head.
- Before installing cylinder head cover and gasket, carefully apply a
small quantity of sealant D 454 300 A2 at four end points of sealing
surfaces on cylinder head -arrows-, using a small screwdriver. Component

Nm
Bolts M6 10
Bolts M8 20
Camshaft bearing caps and camshaft adjuster 10
Exhaust manifold to cylinder head 25
Front exhaust pipe to exhaust manifold 25
Oxygen sensor 50
Spark plugs 25
Toothed belt sprocket to camshaft 55
Intake manifold to cylinder head 10
Cylinder head cover 10
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15-75

Camshafts and camshaft adjusters,
removing and installing


Removing

Cylinder head installed

Repair Manual, Body Exterior, Repair Group 63

Repair Manual, Body Exterior, Repair Group 50
Left cylinder head - Remove noise insulation panel -arrows-.
- Remove front bumper
- Move lock carrier to service position- Remove ribbed belt Page 13
-1 .
- Remove toothed belt Page 13
-4 .
- Remove left-hand cylinder head cover Page 15
-22
.
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15-85

- Install cylinder head covers Page 15
-22
.

- Install toothed belt Page 13
-4 .

- Install ribbed belt Page 13
-1 .

Tightening torques

Component

Nm
Bolts M6 10

M8 20
Except for the following:
Bearing caps to cylinder head 10
Camshaft adjuster to cylinder head 10
Hall sensor rotor to camshaft 25
Hall sensor housing to cylinder head 10
Camshaft sprocket to camshaft 55
Camshaft bearing cap and camshaft
adjuster 10
Cylinder head cover 10
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15-88

Hydraulic lifters, checking


Notes:

Replace malfunctioning lifters completely (lifters
cannot be adjusted or repaired).
When new lifters have been installed the engine
must not be started for about 30 minutes
(otherwise valves will strike pistons).
Irregular valve noises when starting engine are
normal.

- Start engine and run until coolant temperature
reaches approx. 80 C.

- Increase engine speed to about 2500 RPM for
approx. 2 minutes: if necessary, perform road
test.
If the hydraulic lifters are still noisy, locate
malfunctioning lifters as follows:

- Remove cylinder head cover.

- Rotate crankshaft clockwise by turning securing
bolt for toothed belt sprocket until cams of lifters
to be checked are pointing upward.
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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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