lock AUDI A4 1998 B5 / 1.G APB Engine Valve Gear Service Workshop Manual

15-33


Note:
Turn over the engine at the central bolt on the crankshaft. - Turn crankshaft to TDC by hand. Marks -A- and -B- must be aligned.
- Check position of camshafts: larger holes in securing plates on
camshaft sprockets must align opposite one another on inside. If this is
not the case, turn crankshaft one revolution further.
- Remove sealing plug from cylinder block, left.
TDC drilling in the crankshaft must be visible (or able to be felt) in line
with the sealing plug hole.

- Screw clamping bolt 3242 for crankshaft into sealing plug hole and
tighten.
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15-35

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 the drilling and in the plunger.
- Insert spring pin and release toothed belt tensioning roller.
Use spring pin from 2024 A.
- Insert camshaft clamp 3391 in securing plates of 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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15-39

Installing

Notes:

Do not allow any oil or coolant to remain in the
blind holes for the cylinder head bolts in the
cylinder block.
Replace cylinder head bolts.
Connecting vacuum hoses Page 10
-28
.
When installing a new cylinder head:

- Screw in centering pin for intake manifold.
The cylinder head supplied as a replacement
part can be used on both sides (left or right). But
a sealing cap (core plug) must be installed in the
front end of the cylinder head in each case.

- Coat outside circumference of sealing cap (core
plug) with sealant AMV 188 001 02.

- Using drift VW 295, knock in sealing cap (core plug) until outside rim is
flush with end of chamfer in cylinder head.
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15-47


Note:
Turn over the engine at the central bolt on the crankshaft. - Turn crankshaft to TDC by hand. Marks -A- and -B- must be aligned.
- Check position of camshafts: larger holes in securing plates on
camshaft sprockets must align opposite one another on inside. If this is
not the case, turn crankshaft one revolution further.
- Remove sealing plug from cylinder block, left.
The TDC drilling in the crankshaft must be visible (or able to be felt) in
line with the sealing plug hole.

- Screw clamping bolt 3242 for crankshaft into sealing plug hole and
tighten.
Pa
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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.
Pa
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15-53

Installing

Notes:

Do not allow any oil or coolant to remain in the
blind holes for the cylinder head bolts in the
cylinder block.
Install new cylinder head bolts.
Connecting vacuum hoses Page 10
-28
.
When installing a new cylinder head:

- Screw in centering pin for intake manifold.
The cylinder head supplied as a replacement
part can be used on both sides (left or right). But
a sealing cap (core plug) must be installed in the
front end of the cylinder head in each case.

- Coat outside circumference of sealing cap (core
plug) with sealant AMV 188 001 02.

- Using drift VW 295, knock in sealing cap (core plug) until outside rim is
flush with end of chamfer in cylinder head.
Pa
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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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15-88

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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