Cylinder Head Components The cylinder head components are described in the following paragraphs. Cylinder Head Cover The cylinder head cover is manufactured from magnesium alloy and is secured to the cylinder head with 11 threaded spacers with rubber seals. The right hand cover incorporates an oil filler cap. The cylinder head cover also provides mounting for the coils. The coils are protected by a plastic cover, sealed with a rubber gasket. The cover is retained with two bolts which are covered with protective caps. NOTE: Damage to the magnesium cover may cause corrosion. Cylinder Heads The cross flow cylinder heads are made of die-cast aluminium and feature: l Centrally located spark plugs l Four valves per cylinder l Two camshafts l Bucket tappets with hydraulic valve clearance adjusters. The combustion chambers are machined into the heads, thus ensuring more uniform matched combustion chambers and compression pressures. Bolted to the front end of the cylinder head are the oil distribution flanges. The flanges provide amounting for the VCC solenoids and the advance-retard ports from the solenoids to the intake camshafts.
ENGINE - V8 DESCRIPTION AND OPERATION The cylinder heads for each bank are different lengths due to the offset of the cylinder rows (cylinder bank 1–4 is shorter). NOTE: The cylinder head gasket part numbers are different for the two cylinder banks. The cylinder head is machineable to a limit of 0.3 mm. A repair cylinder head gasket is available and is identified by a small hole beside the 4th and 8th cylinder apertures. Camshafts Two solid cast iron camshafts are used for each cylinder head. The cams run in five machined bearing surfaces with numbered caps for identification. The camshafts are also marked for identification and incorporate hexagonal machined blocks for timing the cams during installation. For installation and servicing, the camshafts are held in position with locking pins. These pins are inserted into the front camshaft bearing caps on both cylinder heads. Valves The intake and exhaust valves are arranged in a V pattern. The valves use single, conical, coil bound shaped valve springs and Hydraulic Valve Adjustment (HVA) tappets and each comprises the following components: l Valve x 1 (inlet or exhaust) l Valve stem seal x 1 l Valve spring x 1 l Valve spring seat x 1 l Valve spring cap x 1 l Valve collets x 2 l Tappet x 1.