Changing spark plugs on an E39 5 Sequence BMW could look like a frightening activity, however with the correct instruments and a bit endurance, it may be completed in a number of hours. This information will offer you step-by-step directions and useful tricks to make the method as easy as doable.
Earlier than you start, it is necessary to assemble the mandatory instruments. You will want a spark plug socket, a ratchet, a spark plug hole gauge, and a brand new set of spark plugs. Moreover, it’s possible you’ll wish to have a pair of gloves and a store towel available. After getting your instruments and supplies prepared, you’ll be able to start the method of changing the spark plugs.
Step one is to disconnect the detrimental battery terminal. This may assist stop any electrical shocks if you are engaged on the engine. Subsequent, take away the engine cowl and find the spark plugs. They’re sometimes positioned on the highest of the engine, and they’ll have wires linked to them. Use the spark plug socket and ratchet to take away the outdated spark plugs. Watch out to not overtighten the brand new spark plugs, as this could harm the engine. Lastly, reconnect the battery terminal and begin the engine. If in case you have adopted these steps appropriately, your E39 5 Sequence BMW must be operating easily with new spark plugs.
Security Precautions
Altering spark plugs is a comparatively easy activity that may be accomplished in about an hour. Nevertheless, there are a number of security precautions that it is best to take earlier than you start:
- Disconnect the battery. This may stop any electrical shocks.
- Permit the engine to chill down. This may stop burns.
- Put on gloves. This may defend your fingers from cuts and burns.
- Use warning when eradicating the spark plugs. They are often brittle and break simply.
- Don’t overtighten the spark plugs. This could harm the cylinder head.
Further Security Suggestions
Listed here are some extra security ideas to bear in mind when altering spark plugs:
- Work in a well-ventilated space.
- Keep away from touching the spark plugs along with your naked fingers.
- Use a spark plug socket wrench to take away and set up the spark plugs.
- Examine the spark plugs for harm earlier than putting in them.
- Substitute the spark plugs in keeping with the producer’s suggestions.
Instruments Required
Socket set
You will want an entire socket set to take away the spark plugs. The socket set ought to embody sockets of varied sizes, together with a 16mm spark plug socket. A 6mm Allen key socket can also be wanted to take away the ignition coils.
Spark plug wrench
A spark plug wrench is a specialised instrument used to take away and set up spark plugs. It’s designed to suit snugly across the spark plug, offering a safe grip for elimination and set up.
Hole gauge
A niche gauge is used to measure the hole between the spark plug electrodes. The hole must be set to the producer’s specs, sometimes between 0.035 and 0.045 inches (0.89 and 1.14 mm).
Torque wrench
A torque wrench is used to tighten the spark plugs to the required torque. The torque setting must be specified within the automobile’s service guide, sometimes round 25 Nm (18 lb-ft) for BMW E39 5 Sequence engines.
Further instruments
Along with the important instruments listed above, the next objects could also be useful:
- New spark plugs
- Anti-seize compound
- Work gloves
- Store rags
- Flashlight
Disconnecting the Battery
To make sure your security when engaged on the spark plugs, it’s essential to disconnect the battery first. This easy step prevents any electrical shock or unintentional ignition through the restore course of. This is a step-by-step information to soundly disconnecting the battery:
1. Collect the mandatory instruments: You will want a 10mm wrench, a pair of insulated pliers, and a towel or rag.
2. Find the battery: Open the hood and determine the battery, normally positioned within the engine bay in the direction of the entrance of the automobile.
3. Disconnect the detrimental terminal first: Utilizing the 10mm wrench, fastidiously loosen the bolt connecting the detrimental terminal (marked with a “-” image) to the battery. Gently pull the terminal away from the battery submit.
4. Wrap the detrimental terminal: Place the towel or rag over the disconnected detrimental terminal to stop any unintentional contact with the constructive terminal.
5. Disconnect the constructive terminal: Repeat step 3 for the constructive terminal, which is usually marked with a “+” image.
6. Double-check connections: Make sure that each the detrimental and constructive terminals are utterly disconnected and no cables are making contact with the battery posts.
| Unfavourable Terminal | Optimistic Terminal |
|---|---|
| Marked with “-“ | Marked with “+” |
| Disconnect first | Disconnect final |
| Wrap with towel or rag | Don’t wrap or cowl |
Eradicating the Engine Cowl
1. Find the engine cowl on the entrance of the engine.
2. Discover the rear fringe of the quilt and push down on the clips that maintain it in place.
3. Slide the quilt ahead and carry it off the engine.
4. Disconnect {the electrical} connector that’s hooked up to the again of the engine cowl. This connector is for the oil stage sensor.
| Entrance | Again | Connectors |
|---|---|---|
 |
 |
 |
The oil stage sensor connector is a white connector with a single wire. It’s positioned on the passenger aspect of the engine cowl, close to the entrance.
As soon as {the electrical} connector is disconnected, the engine cowl might be eliminated utterly.
Finding the Spark Plugs
The spark plugs on an E39 5 Sequence are positioned within the engine compartment, close to the highest of the cylinder head. They’re lined by a plastic engine cowl, which have to be eliminated to entry them.
To take away the engine cowl, first find the 2 plastic clips that maintain it in place. The clips are positioned on the back and front of the quilt. After getting positioned the clips, use a flathead screwdriver to pry them misplaced.
With the clips eliminated, now you can carry off the engine cowl. Watch out to not harm the quilt or the spark plugs.
As soon as the engine cowl is eliminated, you will note the spark plugs. They’re positioned within the middle of every cylinder head.
The spark plugs are held in place by a single bolt. To take away a spark plug, first use a spark plug wrench to loosen the bolt. As soon as the bolt is loosened, you’ll be able to pull the spark plug out of the cylinder head.
When eradicating the spark plugs, watch out to not drop them. If a spark plug is dropped, it may be broken.
Here’s a desk summarizing the steps for finding the spark plugs:
| Step | Description |
|---|---|
| 1 | Find the 2 plastic clips that maintain the engine cowl in place. |
| 2 | Use a flathead screwdriver to pry the clips misplaced. |
| 3 | Carry off the engine cowl. |
| 4 | Find the spark plugs within the middle of every cylinder head. |
| 5 | Use a spark plug wrench to loosen the bolt that holds the spark plug in place. |
| 6 | Pull the spark plug out of the cylinder head. |
Eradicating the Outdated Spark Plugs
After getting entry to the spark plugs, you can begin eradicating the outdated ones. This is a step-by-step information:
- Use a spark plug socket and ratchet: Connect a spark plug socket to a ratchet and punctiliously loosen the outdated spark plug by turning it counterclockwise.
- Take away by hand: As soon as the spark plug is unfastened, take away it by hand to stop cross-threading.
- Examine the outdated spark plug: Study the situation of the outdated spark plug, together with the electrodes, insulators, and threads. This could present insights into any engine points or upkeep wants.
- Clear the world: Earlier than putting in the brand new spark plugs, use a clear rag or compressed air to take away any grime or particles from the spark plug wells.
Further Suggestions for Eradicating Spark Plugs
- Use the proper instruments: Guarantee you’ve got the proper spark plug socket and ratchet to keep away from damaging the spark plugs or engine parts.
- Watch out to not overtighten: Overtightening the spark plugs can harm the threads or strip the spark plug holes within the cylinder head.
- Substitute all spark plugs without delay: It is beneficial to interchange all spark plugs concurrently, even when just one has failed, to keep up constant efficiency and forestall future points.
- Keep away from cross-threading: Be cautious when putting in the brand new spark plugs and make sure you align them correctly with the threads. Cross-threading can completely harm the spark plug holes.
| Torque Specs for E39 5 Sequence Spark Plugs | |
|---|---|
| Spark Plug Sort | Torque (Nm) |
| Commonplace Spark Plug | 30 |
| Iridium Spark Plug | 23 |
Putting in the New Spark Plugs
7. Apply Anti-Seize to the New Spark Plugs
The ultimate step in getting ready the brand new spark plugs is to use anti-seize to their threads. This may assist to stop the plugs from seizing within the cylinder head and make them simpler to take away sooner or later. When making use of anti-seize, make sure you use a small quantity and solely apply it to the threads, not the electrode. An excessive amount of anti-seize can truly hinder the spark plug’s means to create a powerful spark. Here’s a desk summarizing the steps for making use of anti-seize to spark plugs:
| Step | Description |
|---|---|
| 1 | Apply a small quantity of anti-seize to the threads of the brand new spark plug. |
| 2 | Use your fingers to unfold the anti-seize evenly over the threads, overlaying your entire floor. |
| 3 | Keep away from getting any anti-seize on the electrode of the spark plug. |
As soon as the anti-seize has been utilized, you’re prepared to put in the brand new spark plugs within the cylinder head.
Reinstalling the Engine Cowl
As soon as the spark plugs have been changed, it is time to reinstall the engine cowl. Begin by fastidiously aligning the quilt over the engine, guaranteeing that the gasket is correctly seated within the groove. Firmly press down on all sides of the quilt to safe it.
Subsequent, reconnect the bottom cable by tightening the terminal nut. Double-check that the cable is securely linked.
Final however not least, examine the oil filler cap to make sure it’s correctly tightened. A unfastened oil filler cap can result in oil leaks or contamination. When you’re glad with the cap’s tightness, reinstall the engine cowl by inserting it on high of the engine and securing it with the clips. Make sure that all clips are securely fixed to stop the quilt from turning into unfastened whereas driving.
Reconnecting the Battery
As soon as the spark plugs have been changed, it is time to reconnect the battery. Listed here are the steps to do it:
- Find the battery: The battery is normally positioned within the engine bay, both within the entrance or the again of the automobile. It is a black field with two terminals, one constructive and one detrimental.
- Clear the battery terminals: Over time, the battery terminals can turn out to be corroded. This could stop connection and result in beginning issues. Use a wire brush or sandpaper to wash the terminals.
- Reconnect the detrimental terminal: The detrimental terminal is normally black or has a detrimental signal (-). Reconnect this terminal first.
- Reconnect the constructive terminal: The constructive terminal is normally purple or has a constructive signal (+). Reconnect this terminal final.
- Tighten the terminals: Use a wrench to tighten the terminals securely. Do not overtighten them, as this could harm the terminals.
- Test the battery connections: Double-check that the battery terminals are securely linked. Wiggle the terminals to ensure they’re tight.
- Reset the ECU (optionally available): Disconnecting the battery can reset the engine management unit (ECU). This may be useful if the automobile is experiencing any issues after the spark plugs have been changed.
- Begin the automobile: As soon as the battery is reconnected, begin the automobile and test for any issues.
- Take a look at drive the automobile: Take the automobile for a brief take a look at drive to ensure it is operating correctly.
Testing the Engine
Earlier than changing the spark plugs, it is important to check the engine. Begin the automobile and let it run for a couple of minutes till it reaches working temperature. If the engine runs roughly, idles erratically, or reveals hesitation, you will have a defective spark plug. Use a spark plug tester to find out the wrongdoer.
A spark plug tester is a straightforward instrument that connects to the spark plug wire. When the engine is operating, it is going to produce a spark that may be seen by the tester’s window. If the spark is weak or intermittent, you’ll need to interchange the corresponding spark plug.
To check the spark plugs, observe these steps:
| Step | Directions |
|---|---|
| 1 | Unplug the spark plug wire from the spark plug. |
| 2 | Insert the spark plug tester into the tip of the spark plug wire. |
| 3 | Begin the engine and observe the tester for a spark. |
| 4 | If the spark shouldn’t be robust or intermittent, substitute the spark plug. |
| 5 | Repeat the method for every spark plug. |
How one can Change Spark Plugs on an E39 5 Sequence
Altering the spark plugs on an E39 5 Sequence is a comparatively easy activity that may be accomplished in about an hour. The next information will offer you step-by-step directions on methods to change the spark plugs in your E39 5 Sequence.
Supplies wanted
– New spark plugs
– 10mm socket wrench
– 16mm socket wrench
– Ratchet
– Extension bar
– Spark plug hole gauge
Directions
1. Park the automobile on a stage floor and switch off the engine.
2. Permit the engine to chill utterly.
3. Open the hood and find the spark plugs. The spark plugs are positioned on the highest of the engine, beneath the valve cowl.
4. Disconnect {the electrical} connectors from the spark plugs.
5. Use the 16mm socket wrench to take away the spark plugs.
6. Hole the brand new spark plugs to the proper specification. The right hole specification might be present in your automobile’s proprietor’s guide.
7. Set up the brand new spark plugs into the engine.
8. Tighten the spark plugs to the proper torque specification. The right torque specification might be present in your automobile’s proprietor’s guide.
9. Reconnect {the electrical} connectors to the spark plugs.
10. Shut the hood.
Folks Additionally Ask
How typically ought to I modify the spark plugs on my E39 5 Sequence?
The spark plugs on an E39 5 Sequence must be modified each 100,000 miles or 6 years, whichever comes first.
What are the signs of dangerous spark plugs?
The signs of dangerous spark plugs embody:
– Engine misfire
– Poor acceleration
– Elevated gas consumption
– Tough idle
How a lot does it value to vary the spark plugs on an E39 5 Sequence?
The fee to vary the spark plugs on an E39 5 Sequence varies relying on the labor price of the mechanic. Nevertheless, the components themselves value round $50 to $75.
