Celica (A20/A40)

1970-1981 / Coupe / Liftback / Japan

All Celica (A20/A40) problems All workshop issues

Minor Engine -- 18R-G Twin-Cam

Cam Journal Wear

Symptoms

Ticking noise from the valve train, loss of power, rough running.

Cause

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.

Fix

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.

Cost mentioned in fix

$500$1,000

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// More Celica (A20/A40) problems

Other known issues

Minor Engine -- 18R-G Twin-Cam

Twin-Cam Head Component Scarcity

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

Common Engine -- 18R-G Twin-Cam

Twin Carburettor Synchronisation

Uneven idle, poor throttle response, one side running rich while the other runs lean.

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