1966–1968 Sunbeam Alpine

The unitary bodyshell of the Sunbeam Alpine relies on a multi-layer box sill assembly and an underfloor cruciform member for torsional stiffness. Water entering through neglected windscreen scuttles, blocked A-pillar drains, and rotten rear inner arches collects inside the sills and rear spring hanger boxes. On UK cars exposed to road salt and damp storage, internal rusting weakens the shell to the point where the chassis folds upward in the middle, causing the doors to jam against the B-posts. Repairing this structural decay requires extensive jigging and skilled fabrication of bespoke steel sections.

Symptoms: Doors stick or rub against the rear wing apertures when opening and closing, Visible distortion or sagging of the rear suspension where spring hangers attach...

Est. repair cost: £1,500–£5,500

The Rootes four-cylinder engine features a cast-iron block topped with an aluminium alloy cylinder head. When historic owners failed to run adequate corrosion-inhibiting antifreeze, galvanic action set in between the dissimilar metals, eating away at the head faces around the water jacket passages. This internal electrolytic corrosion compromises the cylinder head gasket fire rings, resulting in compression loss, overheating, and oil-coolant cross-contamination. Severely eroded heads require specialist aluminium welding, skimming, and thread inserts, or replacement from scarce Rootes donor units.

Symptoms: White emulsion mayonnaise under the oil filler cap or on the dipstick, Excessive white steam and sweet-smelling coolant exhaust smoke when driving...

Est. repair cost: £450–£1,400

Early Sunbeam Alpines used a crossflow radiator with a separate header tank, while Series III through V cars used a vertical-flow radiator. Over decades of classic storage and seasonal use, limescale, rust scale from the iron block, and cast-alloy oxide sludge accumulate in the narrow radiator core tubes. Restricted coolant circulation causes the engine temperature gauge to climb rapidly in slow-moving traffic or on motorway inclines. If ignored, the resulting thermal stress quickly triggers head gasket failure or head warping on the alloy top end.

Symptoms: Coolant temperature gauge needle creeping toward the red sector when idling in traffic, Coolant boiling over through the overflow pipe onto the engine bay floor...

Est. repair cost: £250–£650

Until the minor front suspension redesign of late 1964, the Sunbeam Alpine's independent front suspension utilised greasable upper and lower balljoints and swivel pin assemblies that demanded greasing intervals every 1,000 to 2,000 miles. On classic cars driven intermittently and serviced irregularly, dried grease and road grit cause rapid abrasive wear across the ball cups and pin threads. Excessive play causes vague steering, uneven front tyre scrubbing, MOT advisory notices, and in extreme failure cases, the balljoint can pop out of its socket, dropping the front corner onto the road.

Symptoms: Knocking or clunking noises from the front wheels when driving over potholes or ridges, Vague, wandering steering response requiring constant corrective inputs on straight roads...

Est. repair cost: £200–£550