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3
Pistons and conrods
Assembly overview
⇒ page 40
Checking pistons and cylinders
⇒ page 41
.
3.1
Assembly overview
1 - Piston rings
❑ Offset gaps by 120°.
❑ Use piston ring pliers to
remove and install.
❑ “TOP” faces towards
piston crown.
❑ Checking ring gap
⇒ page 41
.
❑ Checking ring-to-groove
clearance
⇒ page 41
.
2 - Piston
❑ Checking
⇒ page 41
❑ Mark cylinder number
and installation position
relative to conrod.
❑ Low point of piston
crown faces to centre of
cylinder block.
❑ Installing piston
⇒ page 43
.
3 - Circlip
4 - Conrod
❑ Renew as set only.
❑ Mark cylinder number
-B-.
❑ Installation position:
marks -A- must be
above one another.
❑ Separate new conrod
⇒ page 41
.
5 - Bearing shell
❑ Note installation posi‐
tion
❑ Do not interchange used bearing shells.
❑ The lugs on bearing shells must fit tightly in the recesses.
❑ Axial clearance new: 0.05…0.31 mm, wear limit: 0.40 mm
❑ Check radial clearance with Plastigage: new: 0.02…0.07 mm, wear limit: 0.10 mm. Do not rotate crank‐
shaft when checking radial clearance.
6 - Conrod bearing cap
❑ Mark cylinder number -B-.
❑ Installation position: marks -A- must be above one another.
7 - 30 Nm +
1
/4 turn (90°) further
❑ Renew
❑ Oil threads and contact surface.
❑ To measure radial clearance, tighten to 30 Nm but not further.
Phaeton 2003 ➤
6-cylinder injection engine - Edition 02.2014
40
Rep. gr.13 - Crankshaft group
