Question 1

Floor Pan Corrosion

Accepted Answer

Soft or thinning floors, particularly in the driver's and passenger's footwells. Wet carpet after rain. Road noise increases. Water entry through deteriorated door seals, windscreen seals, and from below via road spray. The floors are better protected than British cars of the era but are not immune to 50 years of moisture exposure. Weld in repair sections. Some reproduction panels are available; others must be fabricated. Cost: $500--1,500 per section.

Question 2

Lower Quarter Panel Corrosion

Accepted Answer

Rust and perforation in the lower rear quarter panels, behind and above the rear wheels. Road spray and mud accumulate between the inner and outer panels. Trapped moisture corrodes from inside. The lower quarter area on the coupe is particularly vulnerable because the wheel arch lip traps debris. Cut out and replace with new metal. Reproduction panels exist for some variants but supply is inconsistent. Custom fabrication may be required. Cost: $500--1,500 per side.

Question 3

Inner Guard Corrosion

Accepted Answer

Rust in the engine bay around the inner fenders and strut tower bases. Road spray enters the engine bay and collects in the double-skinned areas around the inner guards. Heat cycling from the engine accelerates corrosion. Clean, treat, and seal if surface rust. Cut out and fabricate if perforated. Cost: $800--2,000 per side for significant repair.

Question 4

Sill Corrosion

Accepted Answer

The rocker panels soften, crumble, and lose structural integrity. Box-section sills trap water when drain holes block. The corrosion process is identical to that described in British cars, though the Toyota steel generally resists longer. Full sill replacement. Repair panels may need to be fabricated as supply is limited. Cost: $1,000--2,500 per side.

Question 5

Oil Leaks

Accepted Answer

Oil seepage and dripping from the valve cover gasket, oil pan gasket, rear main seal, and timing cover. Rubber and cork gaskets harden and shrink over 50 years. The 18R is not a particularly leak-prone engine when the gaskets are fresh, but all gaskets eventually fail. Replace all gaskets and seals systematically. The valve cover gasket ($15--30) and oil pan gasket ($20--40) are easy. The rear main seal requires gearbox removal. Full reseal: $150--300 DIY, $500--1,000 at a workshop.

Question 6

Timing Chain Noise

Accepted Answer

A rattle or slapping sound from the front of the engine on cold start that may quiet as the engine warms. The timing chain stretches and the tensioner wears over 150,000+ km. The chain guides can also crack and break. Replace the timing chain, tensioner, and guides as a set. Cost: $150--400.

Question 7

Overheating

Accepted Answer

Temperature gauge climbs in traffic or on hot days. Coolant loss. The cooling system's capacity diminishes as the radiator cores and blocks with corrosion, hoses collapse internally, thermostats stick, and water pumps wear. Cooling system refresh: new radiator (aluminium upgrade $250--500), thermostat ($15--30), water pump ($50--100), and all hoses. Total: $300--700.

Question 8

Carburettor Wear

Accepted Answer

Rough idle, hesitation, poor fuel economy. The single-cam 18R uses a two-barrel Aisan carburettor that is generally reliable but does wear. Throttle shaft bushings wear (causing air leaks), float valves stick, jets accumulate varnish, and gaskets perish. Modern ethanol-blended fuels accelerate deterioration of rubber components. Rebuild with a carburettor kit ($40--80). If the throttle shaft bushings are worn, the carburettor body needs rebushing. Cost: $50--200 for a full rebuild.

Question 9

Twin-Cam Head Component Scarcity

Accepted Answer

When the twin-cam head needs work -- cracked head, worn cam journals, broken valve springs -- replacement parts are difficult to source. The 18R-G twin-cam head was produced in smaller numbers than the single-cam 18R. Many have been scrapped, and Nissan/Toyota no longer supply most components. The twin side-draft carburettors, intake manifold, and specific head gaskets are all scarce. Source parts through the Toyota enthusiast community, specialist wreckers, and international suppliers. Aftermarket alternatives exist for some components. A spare twin-cam head is worth its weight in gold. Budget: variable, but expect to pay a premium for 18R-G-specific parts.

Question 10

Twin Carburettor Synchronisation

Accepted Answer

Uneven idle, poor throttle response, one side running rich while the other runs lean. The twin side-draft carburettors (Mikuni-Solex or Aisin) must be synchronised -- both carburettors must deliver equal fuel and air at every throttle position. Synchronisation drifts with vibration and thermal cycling. Throttle linkage wear also affects balance. Synchronise the carburettors using a flow meter or Unisyn tool. This is a regular maintenance item -- check synchronisation every 10,000 km or whenever the car idles unevenly. Rebuild kits for the side-draft carburettors: $50--100 each. Synchronisation tools: $30--60.

Question 11

Cam Journal Wear

Accepted Answer

Ticking noise from the valve train, loss of power, rough running. The twin-cam head runs the camshafts directly in the aluminium head casting (no separate bearings). Over extended use, particularly with infrequent oil changes or low oil level, the cam journals in the head wear. Once worn, the head needs re-machining or replacement. Re-machine the cam journals (specialist machine shop work: $500--1,000) or source a replacement head ($1,000--3,000 if you can find one). Prevention is key: regular oil changes and correct oil level.

Question 12

Synchro Wear

Accepted Answer

Grinding when shifting into 2nd or 3rd gear, particularly on quick downshifts. Normal wear after 200,000+ km, particularly with enthusiastic driving. The W50 and W55 gearboxes are durable but not indestructible. Rebuild with new synchro rings. Cost: $600--1,200. Alternatively, source a used replacement gearbox ($300--600).

Question 13

Bushing Deterioration

Accepted Answer

Clunking from the suspension, vague steering, poor handling. The car doesn't feel as precise as it should. All rubber bushings in the suspension perish over 50 years. The front strut mounts, control arm bushings, rear trailing arm bushings, and anti-roll bar bushings all degrade. Replace all bushings. Polyurethane alternatives are available for many locations. Front suspension refresh: $150--400. Rear suspension refresh: $150--300.

Question 14

Rear Axle Hop

Accepted Answer

Under hard acceleration or hard cornering on bumpy surfaces, the live rear axle hops or tramples, causing momentary loss of traction. The live rear axle on 4-link location is inherently susceptible to axle hop when the bushings are worn and the dampers are tired. This is not a defect -- it is a characteristic of the design -- but it worsens significantly with worn components. Replace the rear dampers with quality units (KYB or similar: $100--200 per pair), replace all 4-link bushings ($80--150 per set), and ensure the springs are not sagging. A panhard rod (aftermarket, if not standard) helps locate the axle more precisely.

Question 15

Shock Absorber Wear

Accepted Answer

Bouncy ride, poor body control, wallowing in corners. The original shock absorbers are decades past their service life. Even replacements fitted 15--20 years ago are likely worn. Replace with quality aftermarket dampers. KYB and Tokico units are available. Cost: $150--400 per set of four.

Question 16

Wiring Deterioration

Accepted Answer

Intermittent failures, non-functioning accessories, dim lights, difficulty diagnosing faults. Wiring insulation becomes brittle with age and heat. Connectors corrode, increasing resistance. Previous owners' modifications add non-standard wiring. Inspect the harness, repair damaged sections, clean all connectors and earth points. Toyota's wiring is generally better quality than British equivalents, but 50 years still takes a toll. Cost: $100--300 for targeted repairs.

Question 17

Alternator Failure

Accepted Answer

Dim lights, slow cranking, dead battery, charging warning light. Worn brushes, failed voltage regulator, or bearing wear. Standard failure mode for any 50-year-old alternator. Rebuild or replace. Cost: $80--200.

Question 18

Heater Core Leaks

Accepted Answer

Sweet smell inside the cabin, foggy windscreen, coolant on the passenger footwell carpet, low coolant level. The heater core corrodes internally from coolant deterioration and externally from age. It leaks coolant into the cabin. Replace the heater core. On the Celica, this requires significant dashboard disassembly. Cost: $200--500 for the part and labour.

Celica (A20/A40)

Celica (A20/A40) known problems