S4 Quattro Sedan V8-4.2L (BHF) (2005)
/Page-1164001.png)
Piston: Service and Repair
Pistons and connecting rods, component overview
Note: Oil injector jet for piston cooling
1 - Connecting rod bolt, 30 Nm plus 1/4 turn (90°)
^
Replace
^
Lubricate threads and contact surface
^
Tighten to 30 Nm to measure radial play, do not turn further
2 - Connecting rod bearing cap
^
Do not interchange
^
Mark allocation to cylinder using a color marker - B -
^
When installing bearing cap, observe: The wide thrust flange - A - must point to the same side on connecting rod and connecting rod bearing
cap
^
Installation position of connecting rod pairs
3 - Bearing shells
^
Check that retaining tabs are secured
^
Do not interchange used bearing shells (mark, but not on running surface)
^
Over-sized bearings are available for reworked crankshaft connecting rod journals
4 - Connecting rod
^
Only replace as set
^
Mark allocation to cylinder with paint - B -
^
When installing bearing cap, observe: The wide thrust flange - A - must point to same side on connecting rod and connecting rod bearing cap
^
Installation position of connecting rod pairs
^
Axial play for each new connecting rod pair: 0.20 to 0.38 mm
^
Axial play wear limit: 0.60 mm
5 - Piston pin
^
If tight, heat piston to 60°C