Audi Q7 2007 Workshop Manual page 104

Audi Q7 2007 !
6
6-cylinder TDI engine (3.0 ltr. 4-valve common rail), mechanics 01.2006
Checking piston
–
Using a micrometer (75 ... 100 mm), measure approx. 10
mm from the lower edge, perpendicular to the piston pin
axis.
•
Maximum deviation from nominal dimension: 0.05 mm.
⇒ "4.3 Piston and cylinder dimensions"
Nominal dimension
on page 100.
Checking cylinder bore
–
Use 50 ... 100 mm internal dial gauge to take measure-
ments at 3 points in transverse direction -A- and longitudi-
nal direction -B-.
•
Maximum deviation from nominal dimension: 0.08 mm.
⇒ "4.3 Piston and cylinder dimensions"
Nominal dimension
on page 100.
Installation position of pistons
•
Installation position: Arrow -item 1- on piston crown points
to pulley end.
Note
If used pistons are being re-installed, use chalk or water-
♦
proof felt-tip pen to mark installation position and cylinder
number on piston crown.
Do not use a centre punch or scriber, as this would damage
♦
the coating of the piston crown.
Marking conrods
–
Before removing, mark mating positions of conrods and
conrod bearing caps with coloured pen -arrow-.
Note
Only renew conrods as a complete set.
♦
Do not interchange conrod bearings.
♦
98
Repair Group 13 – Crankshaft group
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