Workshop Manuals Factory service & repair Land Rover
01 Discovery Series II - Workshop Manual - 1999MY ON - 6th Edition - NAS02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 INTRODUCTION32 33 GENERAL INFORMATION34 35 GENERAL DATA36 IDENTIFICATION NUMBERS37 38 TORQUE WRENCH SETTINGS39 40 LIFTING AND TOWING41 CAPACITIES, FLUIDS, LUBRICANTS AND SEALANTS42 43 44 MAINTENANCE45 46 ENGINE - V847 48 EMISSION CONTROL - V849 50 ENGINE MANAGEMENT SYSTEM - V851 FUEL DELIVERY SYSTEM - V852 53 COOLING SYSTEM - V854 55 MANIFOLDS AND EXHAUST SYSTEMS - V856 57 58 59 CLUTCH - V860 61 MANUAL GEARBOX - R38062 63 TRANSFER BOX - LT230SE64 65 66 AUTOMATIC GEARBOX - ZF4HP22 - 2467 PROPELLER SHAFTS68 69 REAR AXLE70 71 72 73 74 75 FRONT AXLE76 77 78 79 STEERING80 FRONT SUSPENSION81 82 83 REAR SUSPENSION84 85 86 87 BRAKES88 RESTRAINT SYSTEMS89 90 DOORS91 EXTERIOR FITTINGS92 93 INTERIOR TRIM COMPONENTS94 SCREENS95 96 97 SEATS98 99 SUNROOF100 CHASSIS AND BODY DIMENSIONS101 102 103 104 PANEL REPAIRS105 106 107 108 BODY SEALING MATERIALS109 110 111 112 113 CORROSION PREVENTION AND SEALING114 PAINTING115 HEATING AND VENTILATION116 117 AIR CONDITIONING118 119 WIPERS AND WASHERS120 CHARGING AND STARTING121 122 LIGHTING123 BODY CONTROL UNIT124 125 126 ALARM SYSTEM AND HORN127 128 WINDOWS129 IN CAR ENTERTAINMENT130 HARNESSES131 DRIVING AIDS132 NAVIGATION SYSTEM133 INSTRUMENTS
Land Rover Discovery II80 · FRONT SUSPENSION
80 · Steering & suspension

Description - ACE (FRONT SUSPENSION) (page 7 of 13)

Make
Land Rover
Model
Discovery II
Section
DESCRIPTION AND OPERATION
FRONT SUSPENSIONDescription - ACE · page 7 of 13
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FRONT SUSPENSION

DESCRIPTION AND OPERATION

60-15

The two solenoid operated directional control valves (DCV's) are fitted to ports in the top face of the valve block. The 
DCV's are screwed into the valve block and sealed with O ring seals. Each DCV has a solenoid for electrical operation 
of the valve. The solenoid is sealed to the DCV with two O ring and secured with a cap. The cap, coil and O rings are 
serviceable items. The DCV's are non-serviceable and failure of a DCV requires the replacement of the valve block 
assembly.

The pressure control valve is fitted to a port in the rear face of the valve block. The pressure control valve is screwed 
into the valve block and sealed with O rings. The pressure control valve has a coil for electrical operation. The coil is 
sealed to the pressure control valve with two O rings and secured with a cap. The cap, coil and O rings are serviceable 
items. The pressure control valve is non-serviceable and failure requires replacement of the valve block assembly.

The pressure transducer is fitted to a port in the forward face of the valve block. The pressure transducer is screwed 
into the valve block and sealed with an O ring seal. The pressure transducer is a serviceable item.

The high pressure filter locates in a port on the lower face of the valve block. The gauze and fibre filter is sealed in 
the port with O ring seals. A threaded cap secures the filter in the valve block and is also sealed with an O ring seal. 
A threaded hole on the lower face of the filter allows a bolt to be fitted to remove the filter from the port. If a system 
component is replaced, the filter must be changed.

Four ports are located on the forward face of the valve block and two ports on the rear. Each port is fitted with a seal 
pack which contains two O ring seals and backing rings. The ACE pipes locate and seal in the seal packs and are 
secured to the valve block with the studs and nuts located on the forward and rear faces.

Actuators
Two actuators are used for the ACE system and are attached to the front and rear torsion bars. The actuators apply 
hydraulically generated force to the torsion bar to oppose lateral forces caused by the vehicle cornering.

Each actuator is a conventional double-acting cylinder. A piston is attached to a rod and moves within the cylinder 
when hydraulic pressure is applied. The rod is sealed at the point where it exits the cylinder. The outer end of the rod 
is threaded and locates in a bush in the ACE long arm and secured with a nut. A rubber gaiter covers the rod and 
prevents dirt and moisture from damaging the rod surface and cylinder seals. The cylinder has a forked attachment 
which locates on the short arm bush and secured with a bolt and nut.

Two banjo connections provide for the attachment of the hydraulic hoses from the ACE valve block. The connections 
provide hydraulic flow to each side of the piston to extend or retract the rod.

Parts & tools for this job For Land Rover Discovery

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