Bmw alternator replacement

Bmw alternator replacement DEFAULT

BMW Alternator replacement

Why Do BMW Alternators Need To Be Replaced?

The alternator on your BMW is what provides power to your vehicle when the engine is running.

Without it, you wouldn’t have air-conditioning, power windows or a stereo to blast out your favourite songs (although it’s probably best to have your windows up if your singing voice is anything like mine!), but more importantly, the alternator charges up the battery.

If your battery runs out of power, your BMW won’t start, possibly leaving you stranded in the middle of nowhere.

Don’t ignore the warning signs – if your alternator is not charging correctly, the battery light will light up on the dashboard indicating an issue.

Depending on the location of the alternator, and if other components need to be removed to allow access to the alternator, it can cost between $400 - $1000+ to have it replaced.

When BMW alternators are subjected to high temperatures and get dirty any of the many moving parts of the alternator can eventually fail. The most likely culprit is the bearings.

Sours: https://www.autoguru.com.au

BMW E46 Alternator Replacement – 1998-2006 3 Series – 6 Cylinder

Section 1 - Preparing for Alternator Removal

In order to remove the BMW E46 alternator, the cooling fan assembly needs to be removed. There is simply not enough room in the front of the engine compartment to properly remove the alternator with it in place. Always disconnect your battery before starting this repair.
  1. Since you will be working on the vehicle's electrical system it is critical that you disconnect the negative terminal from your battery before starting. Not disconnecting your battery can cause catastrophic damage to sensitive electronics.Disconnect the negative terminal from the battery before starting this repair.
  2. Remove the intake snorkel from the front of the car. It is held in place with two plastic rivets.bmw e46 alternator removal - Remove the intake snorkel from the front of the engine
  3. Using a 10mm socket wrench, remove the two bolts anchoring the intake muffler to the vehicle. Unclip the intake muffler from the mass air flow (MAF) sensor and remove it from the vehicle.bmw e46 alternator removal - Remove the intake muffler from the vehicle.bmw e46 alternator removal - Unclip the intake muffler from the MAF
  4. Next, the upper radiator hose needs to be removed. Use a metal pick or flat blade screwdriver to release the two locking clips anchoring the upper radiator hose to the coolant expansion tank.bmw e46 alternator replacement - Release the upper radiator coolant hose from the coolant expansion tankbmw e46 alternator replacement - Release the second locking clip from the coolant expansion tank
  5. Release the locking clip anchoring the hose to the thermostat.bmw e46 alternator replacement - Release the locking clip on the thermostat end of the upper radiator hose.
  6. Grasp the hose and remove it from the vehicle. If the hose is stuck on one of the fittings, use a flat blade screwdriver to gently pry it off.bmw e46 alternator replacement - Use a flat blade screwdriver to gently pry the hose off of its fittings if it is stuckRemove the upper radiator hose from the vehicle
  7. Remove the air quality sensor and the wiring harness connection from the right side of the fan shroud.BMW E46 alternator replacement - remove fan shroud electrical connectionsBMW E46 alternator replacement - remove fan shroud electrical connections
  8. Remove the two fasteners anchoring the fan shroud to the front of the vehicle. These fasteners are often lost or changed over the years, so there may be screws, plastic rivets, or even zip ties holding the fan shroud. BMW E46 alternator replacement - remove fan shroud screws
  9. Carefully remove the plastic fan shroud, paying attention to the fan blades during removal. It helps to have someone underneath the vehicle press in on the bottom of the shroud so it clears the fan blades. Once the bottom of the shroud is clear of blades, it will pull out smoothly.remove fan shroud from vehicle
  10. With the fan shroud removed, you can now access the fan clutch nut. Use a BMW fan clutch tool to loosen the fan clutch nut. Remember...the fan clutch nut is a reverse thread! You must turn the nut clockwise (to the right) to loosen it. If you are able to loosen the nut with the tool, remove the fan and proceed to step 12. If you cannot loosen the nut with the tool, go to step 11. BMW E46 alternator replacement - fan clutch nut locationBMW E46 alternator replacement - Loosen the cooling fan clutch nut
  11. It is very common for the fan clutch nut on BMW E46s to seize and not be removable with the fan clutch tool. Lack of maintenance and poor maintenance practices (not greasing nut during prior repairs) causes stripped and seized nuts, making them virtually impossible to remove. Many nuts will show the battle scars of mechanics attempting to remove them...a telltale sign that trouble lingers ahead. Your only option at this point is to remove the fan clutch bolts and remove the plastic cooling fan. Use a T30 torx bit to remove the three fan clutch mounting bolts. Remove the fan from the vehicle.BMW E46 alternator replacement - fan clutch bolt removalBMW E46 alternator replacement - fan clutch bolt removalFan clutch boltBMW E46 alternator replacement - remove cooling fan from vehicle
  12. Next, the belt tensioner will need to be retracted so the main accessory belt can be pulled loose from the alternator pulley. Locate the belt tensioner pulley and remove its dust cap. Using a T50 torx bit, rotate the pulley counterclockwise until it releases its pressure on the main accessory belt.bmw e46 alternator replacement - Rotate the belt tensioner counterclockwise until it releases its pressure on the main accessory belt
  13. With the pressure removed from the main accessory belt, pull the belt off of the idler and alternator pulleys.bmw e46 alternator replacement - Pull the accessory belt off of the idler and alternator pulleys

Section 2 - Removing the BMW E46 Alternator from the Engine

Removing the alternator from the engine of the vehicle is a simple process once you have cleared out the work area. The alternator is held in place with two bolts, one of which is also the mounting bolt for the idler pulley. Now is also an excellent time to replace the inexpensive (and often troublesome) idler pulleyif you haven't done so lately. The area around the alternator is a notoriously nasty place; it is usually covered with grease and sludge from the engine's oil filter which has built up after years of service.
  1. The alternator is anchored to the engine with an upper and lower mounting bolt. The top bolt also serves as the idler pulley mounting bolt.
  2. Using a 16mm socket wrench, remove the idler pulley/upper alternator mounting bolt.bmw e46 alternator replacement - Use a 16mm socket wrench to loosen the top mounting boltRemove the top mounting bolt/idler pulley from the vehicle
  3. Remove the lower mounting bolt with the 16mm socket wrench.bmw e46 alternator replacement - Use a 16mm socket wrench to remove the lower mounting boltbmw e46 alternator replacement - Remove the lower mounting bolt from the alternator
  4. Reach down and push the air cooling duct free from the alternator with your finger.bmw e46 alternator replacement - Push the alternator cooling duct free with your finger
  5. Pull the protective rubber cap free from the positive battery cable connection on the back of the alternator. Using a 13mm socket wrench, remove the positive cable from the rear of the alternator.Pull the protective rubber cap back on the positive battery cablebmw e46 alternator replacement - Use a 13mm socket wrench to remove the positive battery cable nutbmw e46 alternator replacement - Remove the positive battery cable
  6. Grasp the alternator and rotate it away from the engine.bmw e46 alternator replacement - Rotate the alternator away from the engine
  7. Unplug the alternator sensor.Unplug the alternator sensor wire
  8. The alternator can now be lifted off of its mount and removed from the vehicle.bmw e46 alternator replacement - Remove the alternator from the vehicle

Section 3 - Final Reassembly

Installing a new alternator and reassembling your vehicle is very straightforward...it is just the above steps in reverse with no special procedures. We have provided a handy checklist with the exact reassembly steps you need along with important torque values.

BMW E46 Alternator Replacement Checklist

***The following steps were performed on a 2000 323i...other models may vary. 
 

BMW E46 Alternator Replacement Finished

Sours: https://bmwrepairguide.com/bmw-e46-alternator-replacement-1998-2006-3-series-6-cylinder/
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BMW alternator replacement

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How much does alternator replacement cost for BMW?

How much does alternator replacement cost for BMW?

A typical alternator replacement cost in the UK ranges between £200 - £748. The average cost is usually around £474 including parts and labour. Depending on your BMW model and engine and where you live, the price can be higher or lower. See the exact price for your car.

Price estimates last updated a month ago

Car make
and model
Average
dealer price
Fixter logo
Price estimate
Average
savings
BMW

BMW 2 Series Coupe

£571£415 - £508£109
BMW

BMW X3

£391£301 - £368£57
BMW

BMW 4 Series Cabriolet

£708£502 - £613£151
BMW

BMW X4

£526£379 - £463£105
BMW

BMW 4 Series Coupe

£518£361 - £441£116
BMW

BMW 3 Series

£731£510 - £623£164
BMW

BMW X5

£782£612 - £748£102
BMW

BMW 2 Series Coupe

£554£387 - £473£125
BMW

BMW 2 Series Cabriolet

£409£329 - £402£44
BMW

BMW X2

£643£482 - £590£107
BMW

BMW 3 Series Gran Turismo

£556£387 - £552£87
BMW

BMW 2500

£249£200 - £244£27
BMW

BMW 4 Series Cabriolet

£708£502 - £613£151
BMW

BMW 4 Series Gran Coupe

£482£377 - £461£63
BMW

BMW X3

£407£308 - £376£65
BMW

BMW 2500

£249£200 - £244£27
BMW

BMW Z4

£555£387 - £473£125
BMW

BMW 5 Series Gran Turismo

£693£516 - £630£120
BMW

BMW 4 Series Coupe

£509£355 - £434£114
BMW

BMW 5 Series

£538£402 - £571£51
BMW

BMW 2 Series Coupe

£571£415 - £508£109
BMW

BMW X3

£391£301 - £368£57
BMW

BMW 4 Series Cabriolet

£708£502 - £613£151
BMW

BMW X4

£526£379 - £463£105
BMW

BMW 4 Series Coupe

£518£361 - £441£116

Our expert insights into BMW alternator replacement

Our expert insights into BMW alternator replacement

What does an alternator do?

It is the device responsible for generating electricity to charge the battery, and it’s coupled with the engine drive, which means whenever the car is running, the battery is being charged!

Symptoms of a malfunctioning alternator

If your battery is flat and refuses to accept charge through normal driving, or if your headlamps aren’t as bright as normal, then your alternator could be the problem.

View more symptomsView more symptoms

How much does it cost to fix my car?

Save up to 30% on your BMW in alternator replacement. See our table above to browse our honest, upfront prices.

What happens when we replace your alternator?

Our efficient and fully qualified mechanics will replace your alternator, and you will be advised of any other connected or associated problems arising from its malfunction.


Learn more

Daniel, from London

Hey Fixter, how often should an alternator need replacing?

Daniel
Nav

Nav, Fixter in-house mechanic expert

checked
Collection and delivery — anywhere

What does an alternator do?

It is the device responsible for generating electricity to charge the battery, and it’s coupled with the engine drive, which means whenever the car is running, the battery is being charged!

Symptoms of a malfunctioning alternator

If your battery is flat and refuses to accept charge through normal driving, or if your headlamps aren’t as bright as normal, then your alternator could be the problem.

View more symptomsView more symptoms

How much does it cost to fix my car?

Save up to 30% on your BMW in alternator replacement. See our table above to browse our honest, upfront prices.

What happens when we replace your alternator?

Our efficient and fully qualified mechanics will replace your alternator, and you will be advised of any other connected or associated problems arising from its malfunction.


Learn more

Daniel, from London

Hey Fixter, how often should an alternator need replacing?

Daniel
Nav

Nav, Fixter in-house mechanic expert

checked
Collection and delivery — anywhere

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Book your next BMW alternator replacement in less than 5 minutes.

Book your next BMW alternator replacement in less than 5 minutes.

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Want to learn more about BMW alternator replacement?

Want to learn more about BMW alternator replacement?

Sours: https://www.fixter.co.uk/alternator-replacement/bmw

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How to repair and check BMW alternator

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