volkswagen Workshop Repair Guides

Volkswagen Workshop Service and Repair Manuals

Industrially cracked conrods > < Assembly overview - pistons and conrods
Conventional conrods
   
Conventional conrods
1 - Piston rings
q   Offset gaps by 120°
q   Remove and install using piston ring pliers
q   “TOP” faces towards piston crown
q   Checking ring gap → Fig.
2 - Piston
q   Checking → Fig.
q   Mark installation position and cylinder number
q   Arrow on piston crown points to pulley end
q   Oil scraper ring, 2 part
q   Checking ring-to-groove clearance → Fig.
q   Install using piston ring clamp
3 - Conrod
q   Renew as set only
q   Mark cylinder number -B-
q   Installation position: marking -A- faces towards pulley end
4 - Conrod bearing cap
q   Mark cylinder number -B-
q   Installation position: marking -A- faces towards pulley end
5 - Nuts
q   30 Nm + 1/4 turn (90 °) further
q   Renew
q   Oil threads and contact surface
q   To measure radial clearance, tighten to 30 Nm but not further
6 - Bearing shell
q   Note installation position
q   Do not interchange used bearing shells
q   Ensure retaining lug fits tightly in recess
q   Upper bearing shell with oil drilling for piston pin lubrication
q   Axial clearance new: 0.05...0.31 mm, wear limit: 0.37 mm
q   Check radial clearance with Plastigage: new: 0.01...0.06 mm, wear limit: 0.12 mm. Do not rotate crankshaft when checking radial clearance
7 - Cylinder block
q   Checking cylinder bores → Fig.
q   Piston and cylinder dimensions → Chapter
8 - Conrod bolt
9 - Circlip
10 - Piston pin
q   If difficult to remove, heat piston to 60 °C
q   Remove and install with drift -VW 222A-

   

Industrially cracked conrods > < Assembly overview - pistons and conrods