foreigneRS

PART A - Engine, Engine Management and Turbocharger

Cylinder Block

1.1 Engine Components

• The cylinder block is a specially selected standard production OHC block.

Cylinder blocks selected have either a standard bore grade 2 or 3.
The bore size of the individual cylinders (either class 2 or 3) is stamped into the cylinder block behind the distributor; starting with cylinder NO.1.

The aluminium alloy pistons are either standard class 2 or 3.

• The pistons have a combustion bowl.

• The upper compression ring is chrome-plated.
Both compression rings are marked "TOP".

• The piston pin is fully floating and secured by snap rings.

Piston, Piston Rings and Piston Pin

1 = Production date and Manufacturer sign.
2 = Piston-standard class and arrow - engine front
3/4 = Compression rings with "TOP" mark 5 = Oil control rings
6 = Piston pin
7 = Snap ring

• The connecting rods have been redesigned to suit high performance engine.

• The crankshaft is dimensionally similar with the standard OHC crankshaft. However, the crank*shaft is forged steel and bearing journals are specially hardened .

• The crankshaft is supported in five main bearings similar to the standard OHC engine. The centre main bearing is fitted with thrust half washers to control crankshaft endfloat, as on standard OHC engine.

• The main and connecting rod bearings are similar to the standard OHC engine but with improved bearing surface material. The procedure to measure bearing clearance is also similar. Note: The main bearing shells in the block have an oil groove.

• The crankshaft sprocket gear and the front and rear oil seals are similar to the standard OHC engine, but reinforced .

Most special tools for removal and installation are also carry over from the OHC engine. The installation tool for the rear oil seal has two additional fastening holes to suit the revised hole circle in the flywheeL

• The flywheel is new and it is fastened to the crankshaft by 9 instead of 6 bolts. The diameter of the flywheel is approx. 25 mm larger than on the OHC engine (without ring gear).

The flywheel and the crankshaft are balanced together during manufacture. The correct position of the flywheel to the crankshaft is ensured by unequal spacings between the fastening holes. The space between the fastening holes "A" is smaller than between the others.