Engine Component Description

Engine Component Description








The Aurora V8 VIN Code C is a 4.0 L (244 cu inch) engine incorporating two intake and two exhaust valves per cylinder with individual cylinder head mounted camshafts for intake and exhaust functions (DOHC). The cylinder bore diameter is 87 mm (3.43 inch) and the piston stroke is 84 mm (3.31 inch). The cylinders are arranged in two banks of four with a 90 degrees included angle. The left (front) bank of cylinders are number 2-4-6-8 and the right (rear) bank cylinders are 1-3-5-7. Engine firing order is 1-2-7-3-4-5-6-8.

Crankcase
The cylinder block is constructed of aluminum alloy by the die casting method and is constructed of two sections, an upper and a lower crankcase, split at the crankshaft center line. The grey cast iron cylinder liners are cast with the upper crankcase. The upper and lower crankcase sections are held in alignment by four dowel pins. Once machined, the sections must be kept together as a set. Sealing between the crankcase halves consists of a silicone rubber seal and a bead of anaerobic sealant along each side. Since the lower crankcase contains the lower main bearings, this casting adds to the structural rigidity of the engine assembly. Both upper and lower crankcases incorporate oil drain back passages isolated from the crankcase. These passages provide a direct path from the cylinder heads to the oil pan in order to prevent the needless aeration of the oil through contact with the rotating components.

Crankshaft
The crankshaft is a cast nodular iron design with five diameter main bearings. Crankshaft thrust is taken by the number three main bearing. The position sensor, also known as the reluctor wheel, is cast integrally with the crankshaft. The crankshaft is internally balanced and incorporates an one piece rear seal. A rolled fillet radius is incorporated on all bearing journals to improve fatigue strength.

Induction System
The induction manifold is a plastic, lost core casting with a removable plastic sight shield cover.

Right and Left Bank Designation
Right Hand (RH) and Left Hand (LH) designations are viewed from the rear of the engine (left side of the vehicle). In certain cases where a location with respect to the vehicle is required, it will be referred to as right side or left side as viewed from inside the vehicle.