Design and function
Crankshaft The crankshaft is drop-forged in one piece and induction-hardened on the bearing surfaces for increased strength and decreased risk of cracks. The crankshaft has 7 main bearings, each crank bearing is placed between two main bearings. The thrust bearings are located in the center main bearing. Both main bearings and connecting rod bearings have steel cups that are lead nickel plated and lined with lead bronze. The crankshaft can be ground and has five undersize dimensions. In the rear and the front the crankshaft has an integrated hub for attaching a transmission wheel (rear) and a vibration damper/belt pulley (front), respectively. In the front cover cap, a Teflon seal seals against the crankshaft front end. The Teflon seal features an outer felt coating that protects against dust. In the vibration damper housing there is a freely rotating steel ring that works as inertial mass. Between the steel ring and the house the damper is filled with a high viscosity silicon oil. The vibrations are reduced by the oil equalizing the crankshaft’s pulsating rotation and the steel ring’s even rotation.
The crankshaft transmission wheel is placed on the rear end of the crankshaft. A guide pin on the wheel in the crankshaft prevents the wheel from being installed incorrectly. A sealing ring of silicone sealing between the crankshaft and the transmission wheel is situated on the crank shaft end. The combined gear case/flywheel casing is located around the crankshaft transmission wheel and the flywheel. A Teflon seal seals between the flywheel casing and the crankshaft transmission wheel, with an outer felt coating that protects against dust. The crankshaft transmission wheel features a guide pin directed towards the back that fits in the flywheel, so that it cannot be installed incorrectly. The flywheel bolts are fastened through the flywheel, the crankshaft drive and into the crankshaft. The flywheel peripheral surface has a number of milled groves for the injection system speed sensor.
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