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MOTRS

Celica (A20/A40)

1970-1981 / Coupe / Liftback / Japan

All Celica (A20/A40) problems All workshop issues
Minor Engine -- 18R-G Twin-Cam

Twin-Cam Head Component Scarcity

Symptoms

When the twin-cam head needs work -- cracked head, worn cam journals, broken valve springs -- replacement parts are difficult to source.

Cause

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.

Fix

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.

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Other known issues

Common Engine -- 18R-G Twin-Cam

Twin Carburettor Synchronisation

Uneven idle, poor throttle response, one side running rich while the other runs lean.
Minor Engine -- 18R-G Twin-Cam

Cam Journal Wear

Ticking noise from the valve train, loss of power, rough running.
Critical Body and Structure

Floor Pan Corrosion

Soft or thinning floors, particularly in the driver's and passenger's footwells. Wet carpet after rain. Road noise increases.
Critical Body and Structure

Lower Quarter Panel Corrosion

Rust and perforation in the lower rear quarter panels, behind and above the rear wheels.
Minor Body and Structure

Inner Guard Corrosion

Rust in the engine bay around the inner fenders and strut tower bases.
Minor Body and Structure

Sill Corrosion

The rocker panels soften, crumble, and lose structural integrity.
View all 18 Celica (A20/A40) problems