Freelander System Description and Operation
ENGINE - K SERIES KV6
DESCRIPTION AND OPERATION 12-3-15
Cylinder Head Components
The cylinder head components are described below:
Cylinder Head
The cross-flow cylinder heads are based on a four valve, central spark plug combustion chamber, with the inlet ports
designed to induce swirl and control the speed of the induction charge. This serves to improve combustion and hence
fuel economy, performance and exhaust emissions.
LH and RH cylinder heads are identical castings.
Camshafts
Twin camshafts on each cylinder bank are retained by a camshaft carrier, line bored with the cylinder head. The
camshafts are located by a flange which also controls end-float. A crossover drive for the exhaust camshaft, from the
rear of the inlet camshaft is by a short toothed belt, which allows for a much shorter and simpler run for the main
camshaft drive belt at the front of the engine.
The exhaust camshaft drive gears have dampers integral with the gear to minimise torsional vibration. The inlet
camshaft for the LH cylinder head incorporates a reluctor which is used in conjunction with the Camshaft Position
(CMP) sensor to measure engine position. The CMP sensor is bolted to the LH camshaft cover.
ENGINE MANAGEMENT SYSTEM - SIEMENS, DESCRIPTION AND OPERATION, Description.
Cylinder Head Gasket
The KV6 utilises a multi-layer stainless steel cylinder head gasket. The gasket comprises four stainless steel
functional layers, and a stainless steel distance layer to maintain fitted thickness. A full embossment profile is
employed to seal the combustion gases and half embossments are used to provide a durable fluid seal. Sealing
characteristics are further enhanced by the application of a fluro-elastomer surface coating to all layers of the gasket.
Hydraulic Tappets
Self-adjusting, lightweight, hydraulic tappets are fitted on top of each valve and are operated directly by the camshaft.
The valve stem oil seals are moulded onto a metal base which also acts as the valve spring seat on the cylinder head.
Valves
The exhaust valves are of the carbon break type. A machined profile on the valve stem removes any build up of carbon
in the combustion chamber end of the valve guide. All valve seats are machined in three planes, improving valve to
seat sealing.
Camshaft Cover and Engine Cover Components
The camshaft cover and engine cover components are described below:
Acoustic Cover
A moulded plastic acoustic cover is fitted over the engine to absorb engine generated noise. Foam is bonded on the
inside surface of the acoustic cover and a rubber seal is fitted around the oil filler cap.
The acoustic cover is located on the engine by two rubber studs on the underside of the acoustic cover. A rubber
strap, at the rear of the engine, and two quick release fasteners, at the front of the acoustic cover, secure the acoustic
cover in position.
Resonators and part of the engine intake duct are integrated into the acoustic cover, and the engine air filter is
installed in a compartment below a lid secured with two Torx bolts.
A metal foil heatshield is installed on the underside of the acoustic cover.
A rubber duct connects the engine intake duct in the acoustic cover to the RH inner wing. A further duct is installed
between the inner and outer wings to draw engine air from the base of the A post.