Maserati 2000 Biturbo, 2000 Si, 2500, 2800, and 2.24 V 1982–1992 OEM Service Manual OEM

• Covers the Maserati model families listed in the factory publication: 2.0-liter Biturbo coupé, S coupé, 2.0 Spyder, 2.0 i coupé, Si coupé, 2.0 i Spyder, 420, 420 S, MABC modification, 420 i, 420 Si, 222, 2.24 v., and 422; 2.5-liter Biturbo, SE, Spyder, 425, and USA versions; and 2.8-liter 222 E, Spyder i, 228, 228 i, 430, Karif, and USA/CH/S versions.
• The 597-page Italian/English PDF contains the Maserati factory service publication, covering engine removal and installation, three- and four-valve V-6 disassembly, cylinder-head and crankcase work, crankshaft inspection, valve timing, timing-belt service, pumps, manifolds, and turbochargers.
• Details Weber carburetor and Magneti Marelli injection/ignition service, including fuel-pressure testing, sensor adjustment, MABC boost-control variants, Unitest TMF 5000 checks, IAW Car Test, and Magneti Marelli Multitest diagnosis.
• Covers clutch removal and overhaul, ZF S5.18/3 five-speed manual transmission disassembly and assembly, automatic-transmission removal, propeller-shaft work, and Sensitork/Ranger differential disassembly, shim selection, backlash, and bearing-preload procedures.
• Includes front and rear alignment, standard and active suspension, four- and five-bolt hub service, mechanical and power-assisted steering-rack overhaul, brake-caliper repair and circuit bleeding, air-conditioning service, body dimensions, Spyder top work, glass replacement, and interior/panel procedures.
• Illustrates 102 Maserati workshop tools with AG part numbers and applications, supported by torque tables, lubrication data, wear limits, clearance and alignment specifications, diagnostic test charts, system schematics, and exploded assembly views.

Engine, Fuel, and Boost-Control Repair

The technical-data section separates the 2.0-, 2.5-, and 2.8-liter V-6 builds and identifies the AM452/09 and AM470, AM471, AM453 and AM472, AM473, and AM475 engine families. The engine repair chapters cover removal with the clutch, strip-down and assembly, pistons and connecting rods, crankshaft and crankcase inspection, cylinder liners, three- and four-valve heads, cam boxes, valve timing, timing-belt installation, oil and water pumps, accessories, manifolds, and turbochargers.

Fuel-system coverage is divided between the Weber 36 DCNVH 16/100 carburetor and Magneti Marelli electronics. Carburetor material follows the idle, progression, main-metering, accelerator-pump, and manual-choke circuits; the technical data also identifies the Walbro 7509 electric fuel pump. Injection and ignition sections identify the ECUs, injectors, fuel-pressure regulator, solenoid air valve, and the pressure, temperature, throttle, crankshaft, camshaft, and knock sensors. Diagnosis includes Unitest TMF 5000 procedures for Microplex MED 602 C and IAW 04C, IAW Car Test tables, and Magneti Marelli Multitest connections; the IAW section also explains the speed-density control strategy.

The variants section adds Maserati Automatic Boost Control from engine no. 3001, 2000 Biturbo S intercooler and control-unit changes, 2500 fuel-system differences, and Swiss/USA injection and emissions configurations. It supplies system wiring, vacuum-hose routing, fuel-feed layouts, exhaust and evaporative-emissions component views, and market-specific maintenance data.

Drivetrain, Chassis, Climate, and Body Repair

The single dry-plate clutch and ZF manual-transmission chapters cover clutch overhaul, mainshaft and countershaft disassembly, synchronizers and bearings, output-shaft and cover service, selector assembly, internal washer-thickness determination, and installation. Automatic-transmission coverage is limited to removal rather than internal overhaul, an important scope distinction for three- or four-speed ZF units.

The rear-axle chapter covers propeller-shaft work and Sensitork/Ranger differential overhaul, including hypoid pinion position, shim selection, backlash, bearing preload, seals, and installation; the technical tables also identify Salisbury 12 HU applications. Chassis sections add model-specific alignment, MacPherson front suspension, rear suspension and hub work, active-suspension geometry, five-bolt hub variants, electronic shock control, mechanical and power-assisted TWR steering racks, steering-column service, fixed and floating caliper overhaul, parking-brake adjustment, and dual-circuit bleeding.

Air-conditioning repair covers the compressor, electromagnetic clutch, filter, condenser, pneumatic controls, refrigerant discharge and recharge, and automatic-control variants. Body material includes two- and four-door underframe dimension drawings, hood and trunk-lid removal, fuel-tank access, doors and mirrors, dashboard removal, seats and belts, sunroof and Spyder top service, windshield and rear-window replacement, and refinishing procedures.

Diagnostics, Diagrams, and Factory Repair Notes

Useful illustrations include the electronic ignition and injection wiring diagram, electronic ignition system layout, fuel-feed circuit diagram, MABC system wiring diagram, service/emergency brake circuit, and timing-control exploded view. The electrical chapter covers component locations, the main fusebox, battery and radiator wiring, instruments, wipers, and lighting, but directs the technician to a separate Electrical System publication and associated general wiring diagram for full-vehicle schematics.

The tool section includes the AG 20170 flywheel retainer, AG 20370 fuel-pressure gauge set, AG 20500 transmission support, AG 20790 Weber float-level gauge, AG 25010 Unitest, AG 25080 IAW Car Test, and AG 25090 Multitest.

Several factory notes prevent expensive mistakes. From Biturbo 2000 production no. 7032 and 2000 S no. 284, revised clutch mechanism and disc parts are identified; on earlier cars, both components must be changed together if either is replaced. The differential chapter requires matched hypoid pinion and ring-gear numbers and warns against over-spreading the axle housing, which can distort the case and compromise setup. During timing work, the pressed crankshaft timing pin must not be damaged or lost because it provides the indexing reference.

Fuel-pressure testing, refrigerant service, brake bleeding, and engine or transmission removal require proper isolation, recovery, lifting, and support equipment before a pressurized line or major assembly is opened.