740 / 760

1982-1992 / Sedan / Estate / Sweden

All 740 / 760 problems All workshop issues

Critical Engine

Oil Consumption (Turbo Models)

Symptoms

Blue smoke on startup or under boost. Oil level drops a quart every 500-1000 miles.

Cause

Worn turbo seals or valve stem seals. The turbo spins at 100,000+ rpm and relies on tight clearances; age and heat degrade the seals. Valve stem seals harden with age.

Fix

Turbo rebuild or replacement if it's the turbo (PN varies by year; expect £300-600 for a rebuilt unit).

Valve stem seals can be replaced with the head on the car using a spring compressor and air pressure, but it's fiddly.

Budget a weekend.

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// More 740 / 760 problems

Other known issues

Critical Engine

Oil Leaks from Cam Seals and Valve Cover Gasket

Oil puddles under the front of the engine, sometimes dripping onto the exhaust manifold and smoking. The valve cover gasket weeps oil down the side of the block.

Critical Engine

Timing Belt Failure

The engine dies instantly, often with a loud slap or clatter. Won't restart. If you're lucky, it just stops; if you're unlucky, bent valves and a destroyed head.

Common Engine

Flame Trap Clogging (PCV System)

Rough idle, oil leaks from every seal, oil in the intake tract, sometimes a whistling noise from the crankcase breather.

Critical Cooling System

Radiator and Heater Core Leaks

Sweet smell in the cabin, puddles of coolant under the car, overheating, fogged windscreen that won't clear.

Common Cooling System

Expansion Tank Cracking

Coolant level drops, small puddle under the passenger side of the engine bay, sometimes a pressure release hiss.

Critical Cooling System

Thermostat Sticking

Engine takes forever to warm up, heater blows lukewarm air, or (if stuck closed) the engine overheats.

View all 27 740 / 760 problems