INTRODUCTION - ENGINE CRANKCASE

2.2

SPECIFICATIONS

It is made entirely from aluminium alloy, comprising two sections, the actual cylinder block/crankcase and the base plate.

The crankshaft is supported by five main bearings.

The crankcase also houses two counter-rotating shafts that are mounted on a central bush and a ball bearing at the front and the rear.

Special channels in the crankcase walls carry coolant and lubrication fluid.

1. Base plate

2. Cylinder block/crankcase

3. Engine oil filter cartridge mounting

1.9 JTD 16v

CONSTRUCTION FEATURES

The crankcase is in ductile cast iron

The cylinders are formed directly in the engine block, and are graded into three sizes plus one oversize.

The crankshaft is supported by five main bearings (1).

There are special channels in the engine block walls which allow the flow of coolant and lubricating oil.

At the bottom of each cylinder, there is a jet (2) from which oil is sprayed onto the piston crown to cool it and ensure the lubrication of the gudgeon pin.

1.9 JTD 8v

CONSTRUCTION FEATURES

The crankcase is in ductile cast iron

The cylinders are formed directly in the engine block, and are graded into three sizes plus one oversize.

The crankshaft is supported by five main bearings (1).

There are special channels in the engine block walls which allow the flow of coolant and lubricating oil.

At the bottom of each cylinder, there is a jet (2) from which oil is sprayed onto the piston crown to cool it and ensure the lubrication of the gudgeon pin.

1.8

SPECIFICATIONS

The engine block is made of high mechanical strength spheroid cast iron.

The crankshaft is supported by five main bearings.

The cylinder liners/bores are directly in the cylinder block/crankcase.

Special channels in the crankcase walls carry coolant and lubrication fluid.

The lower part of each cylinder liner/bore contains a jet that sprays oil onto the piston crown to cool it and to ensure the gudgeon pin is lubricated.