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E46 (1998-2006) E46 (1998-2006, petrol) E36 (1990-2000) E30 (1982-1994) E21 (1975-1983)
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  • Checking pipelines and leaks

Checking pipelines and leaks (BMW 3 Series E46)

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1. Inspect all engine joints, gaskets, and seals for signs of coolant or oil leaks. Pay particular attention to the cylinder head cover, oil filter, oil pan, and cylinder head. Keep in mind that over time, these areas may show signs of minor leakage, but you are looking for significant leaks (see Haynes advises). If a leak is detected, replace the appropriate gasket or seal (see the relevant chapter of this Manual).

Leaks in the cooling system usually leave behind a trace of white or rusty deposits

Leaks in the cooling system usually leave behind a trace of white or rusty deposits


2. Check the condition and reliability of fastening of all pipes and hoses related to the engine. Make sure that all clamps are in place and securely tightened. Broken or lost clamps can cause very serious consequences in the future.

3. Carefully check the entire length of the radiator and heater hoses. If you notice signs of cracking, rubber decomposition or abrasion, replace the hose. Cracks become more noticeable if you squeeze the hose. Pay attention to the clamps that attach the hoses to the radiator and to the engine. A clamp that is too tight can cut through the hose and cause a leak.

4. Inspect all components and connections of the cooling system for leaks. If a leak is detected, replace the gasket or seal (see chapter 3).



5. If the vehicle is equipped with an automatic transmission, check the transmission coolant hoses in the same manner.

6. Raise the vehicle and inspect the fuel tank and filler neck for cracks, holes, and other damage. Pay particular attention to the connection between the filler neck and the tank. Sometimes leaks occur due to cracks in the connecting hose or a poorly tightened clamp.

7. Inspect all rubber hoses and metal tubes coming from the tank. Check if the connections are tight, if there are any kinks in the tubes, and if the hoses are in good condition. Pay attention to the ventilation hoses, which tend to wrap around the filler neck and can therefore become pinched or kinked. Follow the hoses along their entire length to the front of the car. Replace any faulty sections.

8. Carefully inspect the metal brake system tubes that run underneath the car. If the tubes are damaged or rusty, replace them.

9. In the engine compartment, check the reliability of the connection of all fuel lines. Inspect the vacuum hoses for kinks, abrasions and signs of decomposition.

10. Check the condition of the hydraulic steering system hoses and pipes.

This article is available at russian, bulgarian, belarusian, ukrainian, serbian, croatian, romanian, polish, slovak, hungarian
Article verified: Ilyinsky Matvey

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БМВ E46: Maintenance
Next articles

Resetting the Service Interval Display
Changing engine oil and oil filter
Scheduled maintenance
Maintenance Procedures Introduction
Rear wheel drive device
Accessory Drive Belt — Checking and Replacing
Checking the suspension and steering
Checking the front brake pads
Checking the rear brake pads
Checking the parking brake


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BMW E46 (1998-2006) 
  • General information
  • Manual
  • Maintenance
  • Power unit
  • Engine repair
  • Cooling system
  • Power system (gasoline)
  • Injection system (gasoline)
  • Fuel system (diesel)
  • Exhaust system
  • Ignition system
  • Charge and launch systems
  • Transmission
  • Car gearbox
  • Clutch and drive shafts
  • Chassis
  • Brake system
  • Suspension front and rear
  • Steering
  • Body
  • Body care and repair
  • Exterior
  • Interior
  • Electrical equipment
  • Troubleshooting
  • Lighting and signaling
  • Equipment and devices
  • Heater and air conditioner
  • Electrical circuits
BMW E46 (1998-2006, petrol) 
  • General information
  • Manual
  • Repair on the road
  • Weekly checks
  • Maintenance
  • Troubleshooting
  • Power unit
  • 4 cylinder engines
  • 6 cylinder engines
  • Engine overhaul
  • Cooling and heating
  • Fuel and exhaust system
  • Starting and charging system
  • Ignition system
  • Transmission
  • Clutch
  • Mechanical gearbox
  • Automatic gearbox
  • Cardan and drive shafts
  • Chassis
  • Brake system
  • Wheel suspension
  • Steering
  • Body
  • Exterior
  • Interior
  • Electrical equipment
  • Equipment and devices
  • Electrical circuits
BMW E36 (1990-2000) 
  • General information
  • Maintenance
  • Power unit
  • Engine repair
  • Cooling system
  • Ignition system
  • Supply system
  • Fuel injection system
  • Exhaust system
  • Transmission
  • Clutch
  • Car gearbox
  • Front and rear axle
  • Chassis
  • Steering
  • Brake system
  • Body
  • Exterior
  • Interior
  • Electrical equipment
  • Heating system
  • Equipment and devices
  • Power devices
  • Electrical circuits
BMW E30 (1982-1994) 
  • Power unit
  • M10/M20 engine
  • M40 engine
  • Ignition system
  • Lubrication system
  • Cooling system
  • Supply system
  • Fuel injection
  • Exhaust system
  • Transmission
  • Clutch
  • Manual gearbox
  • Front axle
  • Rear axle
  • Chassis
  • Steering
  • Brake system
  • Body
  • Exterior
  • Interior
  • Electrical equipment
  • Heating system
  • Equipment and devices
  • Electrical circuits
BMW E21 (1975-1983) 
  • General information
  • Specifications
  • Operation and maintenance
  • 4-cylinder engine
  • Engine repair
  • Cooling and lubrication system
  • Supply system
  • Ignition system
  • 6-cylinder engine
  • Engine repair
  • Cooling and lubrication system
  • Supply system
  • Fuel injection system
  • Ignition system
  • Transmission
  • Clutch
  • 4-speed manual gearbox
  • 5-speed manual gearbox
  • Automatic gearbox
  • Cardan and rear axle
  • Chassis
  • Steering
  • Front suspension
  • Rear suspension
  • Brake system
  • Electrical equipment
  • Equipment and devices
  • Electrical circuits
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