TF and TG Gemini Repair Manual
The TG Gemini is the final model of the first-generation Holden Gemini, featuring refined styling, improved mechanical reliability, and upgraded interior options. For restorers, having a TG-specific restoration parts checklist ensures authenticity and simplifies sourcing.
This guide covers:
- Engine & drivetrain
- Transmission & clutch
- Suspension & steering
- Brakes
- Body panels & rust-prone areas
- Interior & electrical
- Wheels & running gear
Engine & Drivetrain
Factory Engines
- 1.6L Isuzu G161Z OHV petrol (standard)
- Optional 1.8L engine upgrade
- 4-speed manual transmission
- 3-speed automatic (optional)
Engine Parts Checklist
- Complete engine rebuild kit (pistons, rings, bearings)
- Timing chain & tensioner
- Carburettor rebuild kit
- Mechanical fuel pump
- Water pump & thermostat
- Engine mounts
- Ignition system: points, condenser, coil, spark plugs
Transmission & Driveline
Manual Gearbox & Clutch
- Clutch kit (plate, pressure plate, release bearing)
- Gearbox synchros
- Input/output shaft seals
- Clutch master & slave cylinders
- Tailshaft universal joints
- Differential bearings & seals
- Transmission mount
TF and TG gearboxes are mostly reliable, but check 2nd and 3rd gear synchros.
Suspension & Steering
TG Gemini features MacPherson strut front suspension and a live rear axle.
Suspension Checklist
- Front strut inserts
- Coil springs
- Upper strut mounts
- Lower control arm bushes
- Ball joints
- Tie rod ends
- Rear trailing arm bushes
- Rear shocks
- Steering rack boots
Brakes
Factory Setup
- Front disc brakes
- Rear drum brakes
Brake Parts Checklist
- Front rotors & calipers
- Caliper rebuild kits
- Brake pads
- Rear drums, shoes & wheel cylinders
- Brake master cylinder & booster
- Rubber hoses
- Handbrake cables
Replace all old rubber lines to prevent failure.
Body Panels & Rust
Rust is a major issue on first-generation Geminis.
Common Rust Areas
- Chassis rails
- Inner guards
- Battery tray
- Floor pans
- Sills & doglegs
- Rear quarters
- Boot floor
- Windscreen corners
Body Restoration Checklist
- Floor repair sections
- Sill repair panels
- Door seals & window rubbers
- Bonnet & boot seals
- Chrome bumpers & trims
- Badges & emblems
Interior Restoration
TG interiors often need restoration due to wear and fading.
Interior Checklist
- Seat foam & upholstery kits
- Door cards
- Dash pad (cracking common)
- Carpet kits
- Headliner
- Sunvisors
- Steering wheel restoration
- Interior clips & fasteners
Electrical & Lighting
Electrical Checklist
- Wiring loom inspection
- Alternator & starter
- Voltage regulator
- Battery cables & earth straps
- Fuse box refresh
- Headlights & tail lights
- Indicator lenses
- Dash bulbs & switches
Check earthing carefully — poor connections cause ignition and lighting issues.
Wheels & Running Gear
Checklist
- Factory steel wheels or period alloys
- Correct hubcaps
- Wheel bearings (front & rear)
- Differential mounts
- Tyres in original sizes