Audi TT (2007 year). Instruction - page 25

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

– Then use special wrench, long reach -T10264- to turn eccen‐

tric adjuster of tensioning roller clockwise -arrow- as far as stop

and tighten nut -1- by hand.

Caution

If a used belt runs in the opposite direction when it is refitted,

this can cause breakage.

♦ Before removing, mark direction of rotation of toothed belt

with chalk or felt-tipped pen for re-installation.

– Take off toothed belt first from idler roller and then from re‐

maining sprockets.

Installing (adjusting valve timing)
• Tightening torques

⇒ page 84

Note

Perform adjustments on toothed belt only when engine is cold.

Caution

Avoid damage to valves and piston crowns.

♦ The crankshaft must not be at “TDC” at any cylinder when

the camshaft is turned.

Requirements:
• Tensioning roller is locked with locking tool -T10265- and se‐

cured at right stop with nut.

• Camshaft hub locked with diesel injection pump locking pin

-3359- .

• Bolts -1- are fitted but not tightened.
• It should just be possible to turn the sprocket on the camshaft

without axial movement.

Note

Disregard -arrow-.

1. Toothed belt drive

91

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

• Crankshaft is locked in position with crankshaft stop -T10050- .

• Hub of high-pressure pump locked with diesel injection pump

locking pin -3359- .

• Bolts -1- are fitted but not tightened.
• The high-pressure pump sprocket should still just turn, but

there must be no axial movement.

Note

If necessary, apply a screwdriver to bolt heads -1- and turn the

high-pressure pump hub until it can be locked with the locking pin.

92

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

– Turn the camshaft sprocket and high-pressure pump sprocket

in their elongated holes clockwise as far as the stop.

– Install toothed belt in the specified sequence:
1 - Crankshaft sprocket
2 - Tensioning roller
3 - Camshaft sprocket
4 - Coolant pump sprocket
5 - High-pressure pump sprocket
6 - Idler roller

– Loosen nut -1- for tensioning roller and detach locking tool -

T10265- .

Note

Disregard -arrow-.

Note

Ensure that tensioning roller is seated properly in toothed belt

cover (rear) -arrow-.

– Position counterhold tool -T10172- on camshaft sprocket as

shown in illustration.

– Apply force to counterhold tool in anti-clockwise direction

-arrow- and maintain tension.

– Tighten bolts -1- for camshaft sprocket and bolts -2- for high-

pressure pump sprocket in this position.

• Tightening torque: 20 Nm.

1. Toothed belt drive

93

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

– Carefully turn eccentric adjuster of tensioning roller clockwise

-arrow- using special wrench, long reach -T10264- until point‐

er -2- aligns with the centre of the slot on the base plate.

• Nut -1- must not turn.
– Hold tensioning roller in this position and tighten nut.
– Remove locking pins -3359- and crankshaft stop -T10050- .
Checking valve timing:

Caution

Irreparable damage can be caused if the toothed belt slips.

♦ Turn crankshaft only in direction of engine rotation.

– Turn crankshaft two rotations in direction of engine rotation by

turning bolt for crankshaft sprocket until crankshaft is just be‐

fore “TDC”.

– Fit crankshaft stop -T10050- to crankshaft sprocket again.
– Then turn the crankshaft in direction of engine rotation until the

pin -arrow- on the crankshaft stop engages in the sealing

flange as the crankshaft rotates.

• It should now be possible to lock camshaft hub with diesel in‐

jection pump locking pin -3359- .

Note

Disregard items marked -1- and -arrow-.

• It is very difficult to reproduce the locking position of the high-

pressure pump hub. However, a slight deviation -arrow- does

not influence engine operation.

94

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