oil AUDI A6 1998 C5 / 2.G AEB ATW Engines Valvetrain Servicing User Guide

15-57

- Remove 3366 bracket-tensioner.

CAUTION!
Part numbers are listed here for reference only. Always check with
your Parts department for the latest information. - Lightly coat hatched surface of double bearing cap with sealant D 454
300 A2 and install bearing cap (pay attention to alignment bushings).
- Install remaining bearing caps (pay attention to alignment bushings).
- Replace oil seals for intake and exhaust camshafts Page 15
-42
.

- Install camshaft gear.
Note position: thin rib of camshaft gear points outward (arrows) and
TDC Cyl. 1 marking is visible from the front.
- Using 3036 retainer, install camshaft gear retaining bolt.
- Install Camshaft Position (CMP) sensor -G40- Page 15
-38
.
- Install cylinder head cover Page 15
-18
.
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15-60

Hydraulic valve lifters, checking


Special tools and equipment

Feeler gauge
Wood or plastic wedge

Note:
Hydraulic valve lifters cannot be serviced.
Irregular valve noise when starting engine is
normal.

- Start engine and let run until coolant
temperature reaches at least 80 C (176 F).

- Increase RPM to 2500 for about 2 minutes; if
necessary test drive vehicle.

Note:
If irregular valve noises disappear but then
reappear during drive, replace oil retaining valve.
Oil retaining valve is located in oil filter bracket
Page 17
-6 .
If hydraulic valve lifters are still loud, locate faulty
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15-62

Valve stem oil seals, replacing


Cylinder head installed

Special tools and equipment
VW653/3 pressure hose
3122B spark plug removal tool
3362 valve spring tool and 3362/1 pressure
piece
3364 valve seat tool
3365 valve stem seat fitting tool

Removing

- Remove camshafts and hydraulic chain
tensioner Page 15
-50
.

- Remove valve lifters and lay aside with camshaft
contact surface facing down. Be careful not to
interchange valve lifters.

-
Using 3122B spark plug removal tool, remove all
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15-64


- Using 3364 valve seat tool, remove valve stem oil seals.
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15-65

Installing

CAUTION! - Place plastic sleeve -A- on valve stem to prevent damage to new valve
stem oil seals.
- Lightly oil lip of valve stem oil seal -B-.
- Insert valve stem oil seal into 3365 valve stem seal fitting tool and
carefully slide onto valve guide.
- Remove plastic sleeve.
- Install camshafts Page 15
-53
.
After installing the camshafts, the engine must not be started for
approx. 30 minutes. The hydraulic valve lifters have to settle
(otherwise valves will strike the pistons). After installing the valvetrain and lifters, carefully rotate the
crankshaft by hand at least 2 full revolutions before starting to be
sure that valves do not strike the pistons.
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15-69

Installing

- Using 3360 driver, press new, oiled valve guides
from camshaft side to collar into cold cylinder
head.

Note:
After valve guide with collar is seated, insertion
pressure may not exceed 10kN (2248 lbs =
approx 1.0t), as collar may break off.

- Using 3363 reamer -7 mm, ream valve guide.
Use cutting fluid.

- Reface valve seats Page 15
-71
.

- Replace valve stem oil seals Page 15
-62
.
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