BMW , 5 Series , E12 , 520 (1972-1977) Common Issues
- Water Pump Failure
- Symptoms: Overheating engine, sweet smell, overheated cylinder head
- Causes: Worn or damaged water pump seal, faulty thermostat, low coolant levels
- Rear Main Seal Leaks
- Symptoms: Oil leaks on rear main bearing area, engine oil consumption
- Causes: Worn or damaged rear main seal, engine misalignment
- Timing Chain Failure
- Symptoms: Engine misfires, rough idle, loss of power
- Causes: Worn timing chain, stretched timing chain tensioner
- Oil Leaks from Valve Cover Gaskets
- Symptoms: Oil leaks on valve cover area, engine oil consumption
- Causes: Worn or damaged valve cover gasket, carbon buildup on cylinder head
- Rear Axle Seal Leaks
- Symptoms: Oil leaks on rear axle housing, engine oil consumption
- Causes: Worn or damaged rear axle seal, worn or loose wheel bearings
- Engine Crankshaft End Play Issues
- Symptoms: Engine rough idle, vibration, loss of power
- Causes: Worn crankshaft bearing, excessive end play adjustment
- Clutch Master Cylinder Failure
- Symptoms: Spongy pedal, clutch engagement issues
- Causes: Leaking master cylinder piston seal, damaged clutch release bearing
- Brake Rotor Warping
- Symptoms: Spongy brake pedal, loss of braking performance
- Causes: Warped or overheated brake rotors, excessive brake pad wear
- Fuel Pump Failure
- Symptoms: Engine stalling, hesitation, poor fuel economy
- Causes: Worn or damaged fuel pump, clogged fuel filter
- Ignition Coil Failure
- Symptoms: Weak spark, engine misfires, rough idle
- Causes: Worn or damaged ignition coil, excessive voltage drop on ignition circuit
- Head Gasket Failure
- Symptoms: Overheating engine, coolant leaks, sweet smell
- Causes: Worn head gasket, cracked cylinder head, low compression issues
- Rear Wheel Bearing Failure
- Symptoms: Vibration, clunking noise, loose rear wheel
- Causes: Worn or loose rear wheel bearing, damaged brake rotor
- Transmission Mount Failure
- Symptoms: Clunking noise, vibration, transmission shudder
- Causes: Worn or damaged transmission mount, excessive torque on engine mounts
- Power Steering Pump Failure
- Symptoms: Spongy power steering wheel, loss of steering assist
- Causes: Leaking power steering pump seal, clogged power steering lines
- Rear Brake Caliper Failure
- Symptoms: Spongy brake pedal, loss of braking performance
- Causes: Warped or overheated brake rotors, excessive brake pad wear
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