Holden Torana LJ-LX, Known Issues and Common Problems
Overview
The Holden Torana LJ (1972-1974), LH (1974-1976), and LX (1976-1978) are mechanically robust cars built on proven Holden running gear, the same sixes and V8s, the same gearboxes, and largely the same suspension components used across the entire Holden range. The engines are tough, the drivetrains are well-understood, and mechanical parts are readily available.
The problems are, as always with Australian cars of this era, focused on the body. The Torana rusts in all the same places as its larger Holden siblings, but the compact body means rust damage reaches structural areas faster, there’s simply less metal to lose before the integrity is compromised. The V8 Toranas (LH and LX) also face heat management challenges, as the large V8 engines generate significant heat in the compact engine bay.
Engine, Holden Six (173ci / 202ci)
Worn Bearings and Low Oil Pressure
What happens: Oil pressure drops below 25 psi at idle when hot. Knocking from the bottom end under load.
Why it happens: The main and big-end bearings wear over 50+ years. The oil pump also wears, reducing delivery pressure. Infrequent oil changes accelerate bearing wear.
How to fix it: Bottom-end rebuild, new bearings, check and potentially regrind the crank. Budget $1,500-2,500 at a machine shop. The Holden six is one of the simplest engines in the world to rebuild, it’s a straightforward, honest motor that rewards basic maintenance.
Severity: Needs attention. Low oil pressure kills engines.
Triple Carburettor Synchronisation (XU-1)
What happens: Rough idle, uneven running, flat spots, poor throttle response. The engine feels rough and unbalanced.
Why it happens: The GTR XU-1’s triple Stromberg carburettors must be precisely synchronised, all three must deliver the same airflow at the same throttle opening. Over time, the individual carburettors wear at different rates, the linkage develops play, and the synchronisation drifts. Modern fuel with ethanol also attacks the original rubber components in the carburettors.
How to fix it: Rebuild all three carburettors with quality kits ($150-300 total), then synchronise using a vacuum gauge or Unisyn tool. Each carburettor’s idle mixture, idle speed, and throttle linkage must be adjusted individually, then balanced against the others. This is a skilled job, if you’re not experienced with multiple carburettor setups, find a specialist. Budget $300-500 for a professional rebuild and synchronisation.
Severity: Needs attention. Poorly synchronised triples cause rough running, poor fuel economy, and reduced performance. The XU-1’s character depends on the triples being in tune.
Valve Stem Seal Deterioration
What happens: Blue smoke on startup that clears within a minute. May also smoke briefly on deceleration.
Why it happens: The rubber valve stem seals harden and crack with age. Oil seeps past the valve stems into the combustion chambers.
How to fix it: Replace the valve stem seals. Can be done with the head in situ using compressed air to hold the valves up. Budget $50-100 for a seal kit.
Severity: Minor. Cosmetic smoke unless oil consumption becomes significant.
Engine, Holden V8 (253ci / 308ci)
Overheating in the Compact Engine Bay
What happens: Temperature gauge climbs in traffic or under sustained load. May push coolant out the overflow. Engine pings (detonation) under acceleration.
Why it happens: The 253 and 308 V8 engines generate significantly more heat than the six-cylinder they replaced in the Torana’s engine bay. The engine bay was originally designed for the six, and while the LH/LX were adapted for the V8, the cooling system clearances are tighter than in the larger HQ/HJ/HX sedans. The factory radiator is often marginal, particularly in the 308. Hot exhaust manifolds radiate heat into the confined space, and the thermostat housing is close to the carburettor, causing fuel vaporisation (vapour lock) in extreme conditions.
How to fix it: Upgrade the radiator to a 3-core brass or aluminium unit ($400-800). Fit an electric thermo fan behind the radiator ($150-250) to improve low-speed cooling. Wrap or ceramic-coat the exhaust manifolds to reduce underbonnet heat. Ensure the thermostat is the correct 82°C rating. Check the water pump for leaks and impeller erosion. Consider an insulating gasket between the carburettor and intake manifold to reduce vapour lock.
Severity: Urgent. Overheating damages head gaskets, warps heads, and can crack blocks.
Rochester Quadrajet Carburettor Problems
What happens: Hesitation off idle (the classic “Q-jet bog”), flooding, hard starting when hot, black smoke, fuel smell.
Why it happens: The Q-jet’s primary metering system is sensitive to wear. The accelerator pump fails, the power piston sticks, the float level drifts, and the needle valve leaks. Modern ethanol-blended fuel attacks old rubber components.
How to fix it: Rebuild with a quality rebuild kit ($80-150). Pay particular attention to the float level, an incorrect float level causes 90% of Q-jet running problems. Alternatively, replace with a Holley 4-barrel or Edelbrock Performer carburettor ($400-800) for simpler tuning and better parts availability.
Severity: Needs attention. A poorly running Q-jet wastes fuel and creates flat spots that can be dangerous in traffic.
Valve Train Noise (308 V8)
What happens: Ticking or clattering from the top of the engine. May vary with RPM.
Why it happens: The 308’s shaft-mounted rocker arms wear at the tips and the shaft develops scoring. The pushrod tips can also cup. This is accelerated by infrequent valve adjustments and oil that’s too thin.
How to fix it: Inspect and replace worn components. A Yella Terra roller rocker conversion ($400-800) is the definitive fix, it eliminates the wear mechanism entirely and frees up a small amount of power by reducing friction.
Severity: Needs attention. Severe valve train wear can damage cam lobes.
Oil Leaks
What happens: Oil on the garage floor, oil smell, oil coating on the underside of the engine.
Why it happens: The 253 and 308 share the same rope-style rear main seal as the Holden six, it always leaks eventually. The rocker cover gaskets, timing cover seal, and oil pan gasket all deteriorate with age.
How to fix it: Replace gaskets and seals as needed. The rear main seal requires engine or gearbox removal ($500-1,000 at a workshop). Many owners tolerate a slow leak.
Severity: Minor if slow. Needs attention if significant.
Transmission
Trimatic Automatic Reliability
What happens: Slipping under load, delayed engagement, harsh shifts, overheating. The Trimatic may also develop a shudder on light-throttle upshifts.
Why it happens: The Trimatic 3-speed automatic was Holden’s own design, and it’s adequate at stock power levels behind the six-cylinder engine. Behind the V8, particularly the 308, it’s marginal. The clutch bands wear, the internal seals harden, and the fluid breaks down faster under the V8’s greater torque output. Cars that have been driven hard or modified to produce more power overwhelm the Trimatic quickly.
How to fix it: A fluid and filter service ($100-150) can improve shift quality if the damage isn’t too far advanced. A shift kit ($200-400 installed) firms up shifts and reduces clutch slippage. For a full rebuild, budget $1,200-2,000. For V8 cars making more than stock power, consider a TH350 or TH400 conversion, both are significantly stronger than the Trimatic and bolt in with adapter kits.
Severity: Needs attention. A slipping Trimatic deteriorates rapidly.
Gearbox Synchro Wear (Manual)
What happens: Grinding on gear changes, particularly second and third gear.
Why it happens: Synchro rings wear from use. Second gear wears fastest because it’s the most-used ratio.
How to fix it: Gearbox rebuild with new synchro rings. Budget $800-1,500. The M21 4-speed is well-documented with good parts availability.
Severity: Minor. Progressive but not sudden.
Clutch Hydraulic Failure
What happens: Clutch pedal goes to the floor, won’t return, or feels spongy. Clutch won’t disengage fully.
Why it happens: The clutch master cylinder and slave cylinder seals deteriorate with age. Brake fluid absorbs moisture, causing internal corrosion.
How to fix it: Replace both the clutch master and slave cylinders ($100-200 for both). Flush the system with fresh DOT 3 fluid.
Severity: Needs attention. You can’t change gears without a functioning clutch hydraulic system.
Suspension
Front Strut Mount Failure (LH/LX)
What happens: Clunking over bumps, particularly at the front. Steering feels vague. Noise when turning the steering wheel at low speed.
Why it happens: The LH and LX use MacPherson strut front suspension with rubber top mounts. These mounts deteriorate with age and loading, allowing the strut to move within the mount.
How to fix it: Replace the strut top mounts ($50-100 per side). This is a straightforward job, the strut assembly must be removed and the spring compressed to access the top mount. Replace the strut bearings at the same time.
Severity: Needs attention. Worn strut mounts affect steering precision and alignment stability.
Worn Rear Trailing Arm Bushings
What happens: Clunking from the rear under acceleration and braking. Rear axle wanders. The car feels loose and imprecise through corners.
Why it happens: The rubber bushings in the rear trailing arms deteriorate over time. The trailing arms locate the rear axle laterally and longitudinally, when the bushings wear, the axle can move under load.
How to fix it: Replace the trailing arm bushings. Polyurethane replacements (Nolathane, SuperPro) are recommended, they last longer than rubber and provide more precise axle location, though they transmit slightly more road noise. Budget $150-300 for a complete set.
Severity: Needs attention. Worn trailing arm bushings compromise rear axle location and handling.
Rear Coil Spring Sag
What happens: The rear of the car sits lower than it should. May bottom out over bumps. Uneven stance when viewed from the side.
Why it happens: Coil springs lose their temper over decades. Cars that have carried heavy loads or towed trailers sag faster.
How to fix it: Replace with new springs. Pedders, King Springs, and Lovells all offer Torana-specific replacement springs in standard and lowered heights. Budget $200-400 per pair.
Severity: Needs attention. Sagging springs affect handling and can allow the rear axle to contact the body.
Body
Rear Quarter Rust
What happens: Rust in the rear quarter panels, behind and below the rear wheels. Bubbling paint, perforation, structural deterioration.
Why it happens: The rear quarters on the Torana trap road spray between the inner and outer skins. The complex shapes create pockets where water sits. The dog-leg area where the rear quarter meets the sill is particularly vulnerable.
How to fix it: Cut out rusted metal and weld in new sections. Reproduction outer quarter panels are available from specialists. The inner structure may also need fabrication. Budget $1,500-3,000 per side for a comprehensive repair by a skilled panel beater.
Severity: Urgent if structural. The rear quarters contribute to the body’s torsional rigidity.
Floor Pan Corrosion
What happens: Perforated floor pans, soft metal, visible rust from inside (under the carpet) or outside (from underneath).
Why it happens: Water ingress through door seals and firewall, combined with road spray from below. The Torana’s compact floor area means any rust quickly reaches structural areas.
How to fix it: Reproduction floor pan sections are available. Cut and weld new metal. Budget $2,000-6,000 for comprehensive floor repair.
Severity: Urgent. Structural component of the unibody.
Inner Guard and Chassis Rail Rust
What happens: Hidden rust in the front inner guards and the chassis rails where they pass through the engine bay.
Why it happens: Road spray and mud collect in the inner guard area, sitting against the metal for months or years. The engine bay heat cycling accelerates corrosion once it starts.
How to fix it: Clean out the inner guards, cut away rusted metal, fabricate and weld new sections. Budget $1,500-4,000 per side. This is hidden structural work that must be done properly.
Severity: Urgent. The chassis rails carry suspension and engine loads.
Windscreen and Rear Window Rust
What happens: Rust under the glass seals, visible as bubbling paint around the windscreen or rear window edges.
Why it happens: Water penetrates between the rubber seal and the metal, causing rust that’s invisible until the glass is removed.
How to fix it: Remove the glass, treat all rust, prime, and reseal with new rubber seals. Budget $400-800 per window including new seals.
Severity: Needs attention. Water ingress from window seals is a major source of interior and structural rust.
Electrical
Alternator and Charging Issues
What happens: Battery goes flat, dim headlights, ammeter shows discharge.
Why it happens: The alternator’s internal components (brushes, bearings, voltage regulator) wear over time. The external wiring and connections corrode.
How to fix it: Replace or recondition the alternator ($150-300). Clean all electrical connections and earth points.
Severity: Needs attention. A failed charging system will leave you stranded.
Earth Point Corrosion
What happens: Intermittent electrical faults, instruments flicker, lights dim, engine runs erratically.
Why it happens: The body-mounted earth points corrode over time, creating high resistance in the electrical circuits.
How to fix it: Clean every earth point to bare metal and apply dielectric grease. Pay particular attention to the engine-to-body earth strap and the battery negative cable connection.
Severity: Needs attention. Corroded earths cause frustrating intermittent faults.
Preventive Maintenance
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Change engine oil every 5,000 km. Use 15W-40 mineral for both six and V8. The 308 V8 particularly benefits from regular oil changes, clean oil protects the hydraulic lifters and valve train.
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Monitor cooling system temperature closely on V8 models. The compact engine bay runs hot. Carry spare coolant and watch the temperature gauge in traffic.
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Inspect for rust every 6 months. Focus on the rear quarters, floors, inner guards, and sills. Early treatment prevents expensive structural repairs.
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Grease the chassis every 5,000 km. Ball joints, tie rod ends, and universal joints all have grease nipples.
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Service the Trimatic automatic every 30,000 km. Change the fluid and filter. The Trimatic responds to regular maintenance and fails when neglected.
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Check all rubber components annually. Brake hoses, fuel lines, suspension bushings, and engine mounts all deteriorate with age.
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Store indoors. The Torana’s value makes proper storage essential. A dry garage with good ventilation is the minimum.
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