The 1981 Volvo 240 is a rugged, simple RWD platform known for longevity, but 40+ years old means every rubber component, wiring harness, and fuel system part is now a maintenance item. The B21/B23 gas engines are nearly bulletproof if the timing belt is kept fresh; the D24 diesel is slower and has injection pump issues.
Timing Belt Failure (B21/B23 engines)
Common · high severityTypical onset: every 50,000 mi or 5 years, whichever comes first
Symptoms: sudden no-start, engine cranks but won't fire, catastrophic valve/piston contact if belt snaps, no warning before failure
Fix: These are interference engines—belt failure destroys valves and often pistons. Replace belt, tensioner, water pump, and front seals as a kit. 3-4 hours labor for experienced tech, 5-6 for DIY first-timer.
Estimated cost: $400-700
Fuel System Degradation (rubber hoses, fuel pump)
Common · medium severityTypical onset: all original hoses are 40+ years old now
Symptoms: fuel smell in cabin or engine bay, hard starting when hot, stalling under load, fuel weeping at injector connections, pump whine or intermittent fuel pressure
Fix: All rubber fuel lines crack and leak. Replace every hose from tank to engine, including injector seals and return lines. In-tank pump (K-Jetronic system) often weak; external pump also ages out. 4-6 hours to do it right, tank drop recommended.
Estimated cost: $500-900
Wiring Harness Brittleness and Grounds
Common · medium severitySymptoms: intermittent no-start, gauges cutting out, charging system faults, tail lights or dash lights flickering, fuel pump relay clicking but no pump run
Fix: 40-year-old insulation crumbles, especially under hood and behind dash. Ground straps on engine block, chassis, and body corrode. Clean/replace all main grounds (2 hours), rewire problem circuits as found. Full harness replacement is 20+ hours if you go that route.
Estimated cost: $200-600 for grounds and spot repairs; $1,500-2,500 for full harness
Rear Main Seal and Oil Leaks
Common · low severityTypical onset: 100,000+ mi, but often sooner on aged seals
Symptoms: oil drips on garage floor, centered under bellhousing, clutch pedal feels grabby or slips if saturated, oil film on flywheel/pressure plate
Fix: Rear main seal is a 2-piece rope-style on early 240s, one-piece rubber on later. Requires transmission and clutch removal. While in there, replace clutch, pilot bearing, and throwout bearing. 6-8 hours labor.
Estimated cost: $800-1,400
Overdrive Solenoid and Wiring (M46 transmission)
Occasional · low severityTypical onset: 80,000-150,000 mi
Symptoms: overdrive (4th gear lockup) won't engage, solenoid clicks but no engagement, intermittent overdrive function, arrow light on dash flickers or stays off
Fix: M46 4-speed+OD uses an electric/hydraulic solenoid on the tailshaft. Solenoid fails, wiring breaks at the flex point, or internal seals leak. Solenoid replacement: 1-2 hours, transmission on car. Internal relay/seals: 4-6 hours, pan drop required.
Estimated cost: $200-500 for solenoid/wiring; $600-1,000 for internal work
Front Suspension Wear (bushings, ball joints, tie rods)
Common · medium severityTypical onset: 80,000-120,000 mi on original parts; every 60k on replacements
Symptoms: clunking over bumps, steering wander or vague on-center feel, inner tire edge wear, popping sound during turns
Fix: Control arm bushings, ball joints, tie rod ends, and sway bar links all wear. Inspect annually. Full front-end refresh (both lower control arms, ball joints, tie rods, alignment): 5-7 hours.
Estimated cost: $700-1,200
D24 Diesel Injection Pump Failure (diesel models)
Occasional · high severityTypical onset: 150,000-250,000 mi
Symptoms: hard starting, especially cold, black smoke under load, loss of power, rough idle, fuel starvation at highway speed
Fix: Bosch VE injection pump wears internally; seals leak, timing drifts. Rebuild or replace pump (4-5 hours), then time injection pump to crank. Pump cores are rare; expect long lead times or used-market hunting.
Estimated cost: $1,200-2,000
Absolutely buy one if you're handy or have a good indie Volvo shop—just budget $1,500-2,500 immediately for deferred maintenance on any 40-year-old example, and you'll have a 300,000-mile companion.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.