Piston and Connecting Rod Overview
Piston and Connecting Rod Overview
1 Piston Rings
• Offset gaps by 120°.
• Use piston ring pliers for removal and installation.
• "TOP" faces toward the piston crown.
• Checking ring gap. Refer to => [ Piston Ring Gap, Checking ] Piston Ring Gap, Checking.
• Checking piston ring groove clearance. Refer to => [ Piston Ring Groove Clearance, Checking ] Piston Ring Groove Clearance, Checking.
2 Piston
• Checking, refer to => [ Piston, Checking ] Testing and Inspection.
• Mark the installed location to the connecting rod and affiliation to the cylinder.
• The 2 deep valve recesses in the piston head point toward the center of cylinder block.
• Installing the piston, refer to => [ Piston, Installing ] Piston, Installing.
3 Circlip
• Ensure the circlip is securely seated.
4 Connecting Rod
• Only replace as a set.
• Affiliation to the cylinder mark - B -.
• Installed position: the marks - A - must align.
5 Bearing Shell
• Note the installed position.
• Do not interchange used bearing shells.
• Bearing shell retaining tabs must be firmly seated in the notches.
• Axial play new: 0.05 to 0.31 mm, wear limit: 0.40 mm.
• Check radial clearance with Plastigage: new: 0.02 to 0.07 mm, wear limit: 0.10 mm. Do not turn the crankshaft when checking the radial clearance.
6 Connecting Rod Bearing Cap
• Affiliation to the cylinder mark - B -.
• Installed position: the marks - A - must align.
7 Bolt
• 30 Nm + 90° (1/4) additional turn.
• Replace
• Lubricate the threads and contact surface.
• Tighten to 30 Nm to measure radial play, do not tighten the additional turn.
8 Cylinder Block
• Cylinder bore, checking. Refer to => [ Cylinder Bore, Checking ] Testing and Inspection.
• Crankshaft overview. Refer to => [ Crankshaft Overview ] Service and Repair.
• Piston and cylinder dimensions. Refer to => [ Piston and Cylinder Dimensions ] Piston and Cylinder Dimensions.
9 Piston Pin
• If difficult to move, heat the piston to 60 °C (140 °F).
• Remove and install using pilot drift (VW 222 A).