ECU AUDI A6 1997 C5 / 2.G AEB ATW Engines Valvetrain Servicing Workshop Manual

15-37


19 -
Hydraulic chain tensioner
Before removing, secure with VAG3366
chain tensioner bracket Removing and installing Page 15
-50
Seal contact surfaces between hydraulic
chain tensioner and cylinder head Page 15
-9 , Fig. 4

20 -
Rubber/metal seal
Replacing Page 15
-53
21 -
Gasket
Always replace
22 -
Exhaust valve Sodium-filledFollow disposal procedures for sodium-
filled valves Page 15
-40

Do not reface by grinding, only hand
lapping is permitted Valve dimensions Page 15
-39
, Fig. 1
Checking valve guides Page 15
-66
Refacing valve seats Page 15
-71Pa
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15-41

Camshafts axial play, checking


Special tools and equipment

VW387 dial gauge holder
Dial indicator
Measure with installed bearing cap on chain
sprocket side and double bearing cap on
camshaft side with valve lifters removed.

- Secure VW387 dial gauge holder with dial
indicator to cylinder head.

Intake camshaft

Exhaust camshaft
Wear limit for intake and exhaust camshafts:
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15-43

CAUTION!

Before removing toothed belt, note direction
of rotation with chalk or felt-tip marker.
Reversing the direction of rotation of a used
belt can destroy the belt.

- Loosen tensioner (arrows) and lift toothed belt from camshaft gear.
- Use 3036 Retainer to loosen camshaft gear.
- Remove camshaft gear.

- Thread camshaft gear retaining bolt (arrow) into camshaft by hand until
stop to guide 2085 seal puller.
- Unthread inner part of 2085 seal puller two turns (approx. 3 mm or 0.12
in.) and secure using knurled bolt.
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15-47

Replacing intake camshaft oil seal

Removing

- Remove ribbed belt and ribbed belt tensioner
Page 13
-15
.

- Disconnect harness connector from Camshaft Position (CMP) sensor -
G40-.
- Remove upper toothed belt cover Page 13
-29
.
- Remove housing for Camshaft Position (CMP) sensor -G40-.
- Remove shutter wheel and washer for Camshaft Position (CMP)
sensor -G40-.

- Insert 2085/1 adapter into camshaft by hand until stop to guide seal
puller.
- Unscrew inner part of 2085 seal puller two turns (approx. 3 mm or 0.12
in.) and secure using knurled bolt.
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15-51


- Loosen tensioner (arrows) and remove toothed belt from camshaft
gear.
- Use 3036 retainer to loosen camshaft gear.
- Remove camshaft gear.
- Remove housing for Camshaft Position (CMP) sensor -G40-.
- Remove shutter wheel for Camshaft Position (CMP) sensor -G40-.

CAUTION!
If over-tightened, the chain tensioner will be damaged. - Secure hydraulic chain tensioner using 3366 bracket-tensioner.
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15-63

- Thread VW653/3 pressure hose into spark plug
hole.

Note:
Lightly tap valve spring retainer to loosen stuck
valve keepers.

Intake and exhaust valves have different installation angles in cylinder
head. 3362 valve spring tool can be used in two different positions:
1 - Top position for the center intake valve
2 - Lower position for both outer intake valves and both exhaust valves
3 - Threaded bores with M6 x 25 retaining bolts on the left and right are
used to secure the lower bracket to cylinder head

- Using retaining bolts bolted into tool, secure 3362 valve spring tool to
cylinder head.
- Adjust tool to correct position for corresponding valve.
- Attach pressure hose to compressor.
Minimum pressure: 6 bar (87 psi)
- Using threaded spindle and 3362/1 pressure piece, press valve springs
downward and remove.
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