Audi TT (2007 year). Manual — part 39
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.
Caution
Thrust washer can slip out of position behind idler gear.
♦ Before positioning balance shaft assembly, slacken off
bolt for idler gear as specified below, but not further. In‐
stallation position of thrust washer
– Slacken bolt -1- for idler gear by approx. 45°.
– If not already fitted, fit dowel sleeves into cylinder block for
centring balance shaft assembly.
– Install balance shaft assembly on cylinder block. If the idler
gear is only partially coated it must be installed in the correct
position:
• White dot -arrow- on idler gear must be aligned centrally with
crankshaft.
• Idler gears not marked with a white dot can be installed in any
position.
• Take care not to damage the coating of the idler gear.
Note
Due to the gear ratio, the white dot -arrow- will not return to its
original position after the crankshaft has been rotated.
– Tighten bolts securing balance shaft assembly
1. Oil pump, sump, balance shaft assembly
147
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.
– Lock balance shaft with locking tool -T10255- , turning balance
shaft as required.
• The lug of the locking tool must engage in the groove of the
balance shaft -arrow-.
– Carefully fit balance shaft gear onto balance shaft; to do so,
push idler gear slightly to one side.
• Take care not to damage the coating of the idler gear.
• The threaded holes in the balance shaft should be aligned as
centrally as possible with the elongated holes in the balance
shaft gear.
Note
If it is not possible to align the elongated holes in the balance shaft
gear with the threaded holes, you must turn the gear some teeth
further as required and then fit it again.
– Tighten bolts -arrows- for balance shaft gear.
– Remove locking tool -T10255- .
148
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.
Note
The following three steps have to be performed simultaneously
(a second mechanic is therefore required):
– Push idler gear -3- firmly in direction of -arrow- into teeth on
drive gear -2- and balance shaft gear -1-. If necessary use a
suitable wooden tool.
– At the same time, turn balance shaft gear slightly anti-clock‐
wise.
– Tighten bolt securing idler gear.
– Remove crankshaft stop -T10050- .
Note
After installation the idler gear must have no backlash. This can
be checked by exerting light pressure by hand.
Remaining installation steps are carried out in reverse sequence;
note the following:
– Install sump
.
– Top up engine oil and check oil level ⇒ Maintenance ; Booklet
810 .
– Install vibration damper
1.7
Re-installing a used balance shaft as‐
sembly
Procedure
Note
♦
If re-installing the "old" balance shaft assembly and neither the
drive gear on the crankshaft nor the crankshaft itself have
been renewed, proceed as described in the following. It is also
essential that the idler gear has NOT been slackened.
♦
If the bolt for the idler gear has been slackened or the drive
gear on the crankshaft or the crankshaft itself have been re‐
newed, you must install a new idler gear with the appropriate
coating. Procedure for installation
⇒ “1.6 Installing a new balance shaft assembly”, page 146
♦
Renew bolts securing balance shaft assembly.
1. Oil pump, sump, balance shaft assembly
149
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.
– Lock balance shaft with locking tool -T10255- , turning balance
shaft as required.
• The lug of the locking tool must engage in the groove of the
balance shaft -arrow-.
– If not already fitted, fit dowel sleeves into cylinder block for
centring balance shaft assembly.
– Attach balance shaft assembly to cylinder block.
• With the balance shaft locked in position, the idler gear must
engage in the drive gear on the crankshaft.
• Idler gear must have noticeable backlash.
– Tighten bolts securing balance shaft assembly
.
– Remove crankshaft stop -T10050- .
Remaining installation steps are carried out in reverse sequence;
note the following:
– Install sump
– Top up engine oil and check oil level ⇒ Maintenance ; Booklet
810 .
.
150
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