Crankshaft/Pistons - Volvo Penta TAD1630G Workshop Manual

Group 21 Design and Function

Crankshaft/pistons

The crankshaft has 7 main bearings and is nitrocarburized.
The oscillation damper is screw-attached to the polygon hub.
The rear and front crankshaft seal consists of a liptype seal-
ing ring. The front sealing ring seals against a wear ring on
the pulley.
The upper end of the connecting rods is trapezoidal in
shape. The bushing must be line bored after replacement.
The pistons are made of aluminum alloy, have three piston
rings and an inner oil drilling for cooling purposes.
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