Segment:
Microcar / City Car
Target Audience:
Enthusiasts, DIY Mechanics, Owners seeking cost-effective maintenance and repair
Competitors:
Citroën Dyane, Renault 4, Mini (though larger), other European microcars of the era
Design Philosophy:
Compact, rear-engined, rear-wheel-drive, economical and simple construction
Practicality:
Surprisingly spacious interior for its size, hatchback practicality
Heritage:
Successor to the iconic Fiat 126, evolving the basic design for improved comfort and emissions
Engine Overhaul:
Complete
Transmission Repair:
Complete
Electrical System:
Comprehensive
Body And Chassis:
Full Repair
Maintenance Procedures:
All Scheduled and Unscheduld
Diagnostic Troubleshooting:
Detailed Fault Finding
Suspension And Steering:
Complete Service
Braking System:
Full Repair and Adjustment
Heating And Ventilation:
Service and Repair
Interior Trim:
Removal and Installation
Estimated Pages:
N/A (Downloadable, therefore variable based on printing)
Type:
Workshop Service Repair Manual
Digital Format:
Downloadable PDF
Accessibility:
Printable, Tablet Compatible, Smartphone Compatible
Engine:
126A.000, 126B.000 (Air-cooled, 2-cylinder, 650cc, OHV)
Cooling System:
Air Cooling System Components and Servicing
Fuel System:
Carburetor (Weber 28 IMB), Fuel Pump, Lines, Tank
Ignition System:
Distributor, Ignition Coil, Spark Plugs, Timing
Transmission:
4-Speed Manual Synchromesh
Clutch:
Single Dry Plate, Hydraulic Actuation
Drivetrain:
Rear Wheel Drive, Differential
Suspension:
Independent Front (Transverse Leaf Spring), Independent Rear (Coil Springs and Trailing Arms)
Steering:
Rack and Pinion, Manual
Brakes:
Front Disc, Rear Drum, Hydraulic System, Parking Brake
Electrical System:
12V System, Battery, Alternator, Starter Motor, Lighting, Wiper System, Horn
Body And Chassis:
Monocoque Construction, Doors, Hood, Trunk, Bumpers, Seals
Heating And Ventilation:
Internal Heater Core, Airflow Management
Engine Maintenance:
Valve Adjustment, Spark Plug Replacement, Carburetor Tuning, Oil Changes
Engine Rebuilding:
Piston Ring Replacement, Bearing Replacement, Cylinder Honing, Full Engine Disassembly and Assembly
Transmission Overhaul:
Gearbox Disassembly, Reassembly, Synchro Ring Replacement
Clutch Replacement:
Clutch Disc, Pressure Plate, Release Bearing Replacement
Brake System Repair:
Brake Pad/Shoe Replacement, Disc/Drum Machining or Replacement, Master Cylinder Rebuild, Bleeding
Suspension Component Replacement:
Ball Joint, Tie Rod, Bushing, Shock Absorber Replacement
Electrical Component Testing:
Alternator Output, Starter Draw, Light Functionality
Body Panel Repair:
Dent Removal, Rust Repair, Panel Replacement
Wiring Diagrams:
Full Electrical Schematics
Troubleshooting Charts:
Systematic Diagnostic Flows
Depth:
Comprehensive (From basic maintenance to full engine and transmission rebuilds, including electrical diagnostics and bodywork repair)
Engine Code:
126A.000 (for earlier models of the BIS), 126B.000 (later BIS variants)
Configuration:
Air-cooled, 2-cylinder, Inline
Bore X Stroke:
74 mm x 76 mm
Compression Ratio:
8.25:1
Valve Train:
Overhead Valve (OHV) with pushrods
Horsepower Ps:
26 PS (19 kW) at 4,800 rpm
Torque Nm:
45 Nm (33 lb-ft) at 3,000 rpm
Carburetor:
Weber 28 IMB (single barrel)
Fuel Type:
Unleaded Gasoline (historically, leaded gasoline was used)
Oil Capacity:
2.5 Liters (2.6 US Quarts)
Oil Specification:
API SG or higher, SAE 20W-50 recommended (check manual for precise modern equivalents)
Type:
4-Speed Manual Synchromesh
Type:
N/A (No automatic transmission option)
Gear Ratios:
Typical ratios: 1st: 3.818, 2nd: 2.353, 3rd: 1.452, 4th: 1.000, Reverse: 4.400 (Check manual for exact ratios)
Gearbox Oil Capacity:
1.2 Liters (1.3 US Quarts)
Gearbox Oil Type:
API GL-4, SAE 75W-90 or 80W-90 (Check manual for precise specification)
Engine Oil And Filter:
Every 5,000 km (3,000 miles) or 6 months
Spark Plugs:
Every 10,000 km (6,000 miles)
Air Filter:
Every 10,000 km (6,000 miles), clean more frequently
Valve Adjustment:
Every 15,000 km (9,000 miles)
Brake Fluid Flush:
Every 2 years
Transmission Fluid Change:
Every 20,000 km (12,000 miles) or 12 months
Coolant:
N/A (Air-cooled engine)
Brake Fluid:
DOT 3 or DOT 4
Rust Prone Areas:
Wheel arches, sills, floor pans, door bottoms, around windows
Carburetor Issues:
Idling problems, poor fuel economy due to wear or incorrect adjustment
Electrical Gremlins:
Wiring harness degradation, poor ground connections
Suspension Wear:
Bushings and ball joints can wear prematurely
Heater Performance:
Can be marginal in very cold climates due to airflow restrictions or core issues
Manufacturer:
Fiat (Fabbrica Italiana Automobili Torino)
Heritage Statement:
Fiat has a long history of producing small, affordable, and practical cars for the masses.
Predecessor:
Fiat 126 (produced 1972-1980, a heavily revised Fiat 600)
Key Updates For Bis:
Introduction of the hatchback design, larger 650cc engine, improved heating system, revised interior, and minor styling tweaks.
Production Period:
1987-1991
Manufacturing Location:
Turin, Italy (and potentially other Fiat facilities)
