Connecting Rod: Service and Repair

Pistons and Connecting Rods, Assembly Overview






1 Bolt

• Replace

• Lubricate threads and contact surface

• 30 Nm + 1/4 additional turn (90°).

• Use old bolts for radial play measurement, tighten to 30 Nm but do not tighten further

2 Connecting rod bearing cap

• Affiliation to cylinder mark - B -

• Installed location: - A - markings face toward lower side of piston crown (to center of cylinder block)

3 Bearing shells

• Mark used bearing shells

• Bearing shell retaining tabs must be firmly seated in notches

• Installed location: Retaining tabs of both bearing shells lie on the same side of the connecting rod

• Measuring axial play => [ Connecting Rod Axial Clearance, Measuring ] Connecting Rod Axial Clearance, Measuring.

• Radial clearance, measuring => [ Connecting Rod Radial Clearance, Measuring ] Connecting Rod Radial Clearance, Measuring.

• Replacement parts are color coded "yellow" for lower and "red" for upper

4 Connecting rod

• With oil hole for piston pin lubrication

• Only replace as set

• Affiliation to cylinder mark - B -

• Installed location: - A - markings face toward lower side of piston crown (to center of cylinder block)

5 Circlip

6 Piston pin

• If tight, heat piston to 60° C

• Removing and installing using a pilot drift (VW 222 A)

7 Piston

• Checking => [ Piston, Checking ] Testing and Inspection.

• Mark installed location to connecting rod and affiliation to cylinder

• Shallow side of piston head faces cylinder block center

• Piston and cylinder dimensions => [ Piston and Cylinder Dimensions ] [1][2]Piston, Engine.

• Install using tool set (T10133)=> [ Piston, Installing ] Service and Repair.

8 Piston rings

• Compression rings

• Offset gaps by 120 degrees

• Use piston ring pliers for removal and installation

• Mark "TOP" must face toward piston head

• Checking ring gap => [ Piston Ring Gap, Checking ] Piston Ring Gap, Checking.

• Check piston ring groove clearance => [ Ring to Groove Clearance, Checking ] Ring to Groove Clearance, Checking.

9 Piston ring

• Oil scraping ring

• 3 part

• Install upper steel ring so gap is offset by 120 degrees to neighboring compression ring

• Offset all oil scraping ring component gaps to each other