AUDI A4 1997 B5 / 1.G AFC Engine Lock Carrier Removing For Service Owner's Manual

15-21

Camshaft axial play, checking


Housing for camshaft position sensor
removed
Hydraulic lifters removed
Camshaft bearing caps 2 and 4 removed

- Mount dial indicator in holder VW 387 on front end of cylinder head.
- Push camshaft by hand against dial indicator.
- Set dial gauge to zero.
- Push camshaft away from dial indicator.
- Read axial play on gauge.
Specifications:

New: 0.04-0.15 mm (0.0016-0.0059 in.)
Wear limit: 0.35 mm (0.0138 in.)
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15-22

Hydraulic valve lifters, checking


Note:

Irregular valve noise during cranking is
normal.
Do not interchange hydraulic lifters. If
necessary mark them when they are being
removed.
Place lifters that have been removed on a clean
surface with the contact surface (camshaft end)
facing downward.
Hydraulic lifters cannot be repaired or adjusted.
Faulty lifters must be replaced.

- Start and run engine until warm-until radiator
coolant fan has come on at least once.

- Increase engine speed to approx. 2500 RPM for
2 minutes
If the irregular valve noise stops and then re-
occurs again each time vehicle is used in stop
and go traffic:

-
Replace the oil check valves Repair Group
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17.
If the irregular noise does NOT stop, locate faulty
hydraulic lifter as follows:

- Remove cylinder head cover.

- Turn crankshaft clockwise until cam lobe for lifter
being checked is pointing upward.
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15-23

- Use a wooden or plastic wedge to press valve
lifter down.

CAUTION!
Note:
The illustration is used to show an example of pressing down on the lifter
checking the clearance with a feeler gauge-it does not specifically show
the 2.8 liter V6 engine. - If a 0.20 mm (0.008 in.) feeler gauge can be inserted between
camshaft and lifter, replace lifter.
After installing new or re-installing old lifters, and after installing
the camshaft(s), the engine must not be started for at least 30
minutes. Otherwise the valves could strike the pistons. After working on the valve train and lifters, crank the engine
carefully by hand, at least two full revolutions, to make sure that
the valves do not strike the pistons.
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15-24

Valve stem oil seals, replacing


Cylinder head installed

- Remove toothed camshaft drive belt page 13
-
11
.

- Remove camshafts and hydraulic lifters.

- Remove spark plugs.

- Rotate crankshaft by hand to set piston of
appropriate cylinder to Bottom Dead Center
(BDC).

- Thread VW 653/3 hose, US 1106 cylinder
leakdown tester or equivalent with seal into
spark plug hole by hand and apply a continuous
pressure of at least 6 bar (87psi).

Note:
Tight valve keepers can be loosened by tapping lightly on lever VW 541/1
with a hammer. - Install compressor tool 2036 and adjust to height of studs.
- Remove valve spring with valve spring tensioner VW 541/1 and thrust
pad VW 541/5 or equivalent.
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- Remove valve springs.
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15-25


- Remove valve stem oil seal with slide hammer 3047 A.
- Install new valve stem oil seal.

Note:
Always use the enclosed plastic sleeve for installation of valve stem oil
seals to protect the seal from being damaged by the valve keeper
grooves. - Fit protective sleeve over valve stem, slide seal carefully onto valve
guide.
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15-26

Cylinder head, resurfacing


Minimum dimension -a- = 132.75 mm (5.226 in.)
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15-27

Intake and exhaust valves, checking and
refacing


Checking

- Inspect visually for scoring on valve stem and
valve seat surfaces. If clear signs of wear are
present replace valves.

Refacing intake valve
Refacing exhaust valves
WARNING! - 45a - max 3.5 mm (0.138 in.)
b - min. 0.5 mm (0.020 in.)
Valves must not be refaced by cutting or grinding. Only lapping is permitted.
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15-28

WARNING!

Worn sodium-filled exhaust valves must not
be scrapped without properly disposing of
the sodium.

The valves must be cut into two parts with a
hacksaw between the center of the valve
stem and the valve head. They must not
come into contact with water when being cut
open.

After cutting the valves:
Throw the valves, not more than ten at a
time, into a bucket filled with water and
STAND BACK. A sudden chemical reaction
occurs as the sodium comes into contact
with the water.
Valves that have been processed in this way
can then be disposed of in the normal waste.
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