Cylinder Block Assembly: Description and Operation
CYLINDER BLOCKThe cylinder block is made of cast aluminum alloy and has 4 cylinders arranged "in-Line".
A cylindrical cast iron sleeve is installed in each cylinder.
CRANKSHAFT AND MAIN BEARINGS
A mono block casting crankshaft is supported by 5 main bearings which are of precision insert type. Four crank pins on the crankshaft are positioned 180° apart.
PISTONS, RINGS, PISTON PINS AND CONNECTING RODS
The piston is cast aluminum alloy, and has two compression rings and one oil ring.
Among two compression rings (top and 2nd rings), the outer surface of the top ring is treated with nitriding for improvement in abrasion resistance.
The oil ring consists of two rails and one spacer.
The piston pin is offset 0.5 mm towards the major thrust side.
This allows a gradual change in thrust pressure against the cylinder wall as the piston travels its path. Pins, made of chromium steel, have a floating fit in the pistons and in the connecting rods. The connecting rods are made of forged steel, and the rod bearings are of precision insert type.