Porsche 911 Center Lock Structure, Porsche 911 GT3 991.2 Center Lock Tire Replacement

Porsche wheel center cap crest orientation

I was impressed when I learned a while ago that the direction of the crest mark on Porsche's wheel center cap is fixed, but at that time, "In the case of center lock, the direction of the crest does not matter. I also knew that, and I was wondering, "Why?"

Because, even in the case of the center lock, I wondered, "I wonder if I should just remove the center cap and fix it in the direction I want it to face, or put it on, but in the case of the center lock, why not?"

I'm sorry, I thought so normally. I didn't know anything from the structure of the center lock ...

I reflected on it and learned a lot, so I'd like to summarize it so that I don't forget it ^^

Below, the source video is also attached at the end, but in addition to the images taken from it, photos from other sites (source information is also at the end of the page) and manuals are mixed and posted.

Porsche 911 GT3 (991) center lock tire replacement

Well, this time, I learned about center lock on several sites, and the last one I arrived at was this video.

This is a video showing how to replace the 991 type center lock tire of Porsche 911 GT3. The tires of this car are being changed. Porsche 911 GT3 991 type. ↓

The following goods were used to replace the center lock tires.

Since the content about tire replacement is not the main content, I will omit the details (if you are interested, please watch the video).

When changing tires, the manual says, "Please have another person apply the brakes so that the wheels do not rotate." Fix the brake.

Like this.

By the way, this is the problematic (?) Center cap.

First of all, I would like to see what kind of structure the center lock has.

Remove the center cap. The tool to remove (the auxiliary tool for removing the center cap, and the center lock removal nut) is stored in the upper part of the front trunk, so remove it from there and use it.

It seems that it can be removed with other tools, but it may be damaged.

When you remove the center cap, it looks like this. Haha. It looks like this.

Use the auxiliary tool (center lock, removal, nut) to unlock and remove the safety lock of the center lock, and it will look like this.

From the left, lock pin → center lock bolt and lock pin, → assembled state

There were really detailed instructions in this part as well.

• To prevent it from getting dirty
• Do not tilt the wheel when removing
• Apply sufficient grease to the threads of the center bolt and wheel hub.
• Apply aluminum paste to the trapezoidal threads of the wheel hub.
• Make sure that mud is not caught in each part
• Do not allow grease to adhere to other parts

And so on.

Even if you look at the materials around here, the photo above is OK, and the one below is not.

Really, I can't do this unless I'm a person who can do it properly! I thought ^^

No, of course, it's not about people like me who can't even change tires normally, but even among people who can do it to some extent, it's necessary to have someone who has proper knowledge and skills about center locks change it. What?

Oh yeah, and this part ↓

Regarding this part, on every site and in the manual, there was a mess of "confirmation that the lock pin was properly fastened to the center bolt" and "whether it was flat".

This is the correct state. It is a major premise that the white part in the middle moves smoothly when pressed, and there are many descriptions about its proper "position".

In this case ↓, the left is fitted correctly, and the right is useless.

Do you know this? ?? This is the correct position ↓

And this is no good ↓

Now that you know the structure inside, you can replace the tires and then fly to the point where you can tighten them with a torque wrench.

In the case of Porsche 911 GT3 (991), it is said that the center bolt is tightened with "600 Nm", so first tighten it to 600 Nm, then loosen it once "1/4 turn", and then tighten it again with 600 Nm. That's right.

This "torque-loosen-re-torque (torque → loosen → retorque)" seems to be a must-have work. Hey!

so! !! !!

This is the answer to the question I want to know, "Why don't you install the center cap according to the direction of the valve?"

It's finally time for my ignorant question to clear up.

That is here. It is the time to finish the tire change of the center lock and finally attach the center cap ↓

This person also tried to attach the center cap, which was originally written as GT3, so that the letters of GT3 would normally look in the correct position without thinking (probably) anything.

Put on the center cap and push it ... ↓

that? But it doesn't fit.

Oh yeah

Yes, this center cap has a part called "Positioning Tab", which must be fitted so that it faces the thread groove so that it will not fit!

Can you see that the upper part just says "Fit in this position"? ↓

The same is true for the center cap that says GT3, not the crest ↓

So, when I put on the cap according to this "position to put on the center cap", it snapped into place.

In other words! !!

As you can see by looking at it so far, in the case of a normal wheel (5 holes etc.), remove only the center cap in the center and turn it toward the valve position and fix it. It is possible to say that "the crest always points to the valve" because it is only necessary.

However, in the case of the center lock, this work of "applying torque, loosening, and retorque" occurs, and after finishing that, the center cap must be put in place ... As a result, I realized that it was impossible to point the crest toward the valve.

Of course, it may be possible to put in a super spirit and match it. It may happen, and on rare occasions, you may be addicted to a position that points toward the valve.

However, there is no point in spending the time and effort of "dare to do so." Oh, I'm really convinced.

I feel like I'm convinced this much, and if my understanding is different, I'd be happy if you could point out if my understanding is different ^^

Anyway, for me

• The Porsche Crest on the wheel center cap of a Porsche tire always points in the direction of the tire's air valve.
• In the case of Porsche center lock tires, it is difficult to determine the direction that the crest of the center cap points, so there is no fixed direction for the crest.

So it was refreshing! !!

Finally, here is the video.

Looking at the configurator, in this way, in the case of the center cap, the valve was directly above. For example, here is the Porsche 911 GT2 RS that I saw in the configurator.

When the letters "RS" are in the correct reading direction, the valve comes directly above the letters.

I'm sure this was decided by "appearance".

In the case of the "driving center lock Porsche" that is actually delivered, I understood very well that this is not the case.

Ah, it's really refreshing.

Thank you for staying with me for a long time ^^

Source:
◆ Question for Center Lock owners (center locking pin)
◆ Center Lock – lessons learned

Rika (911supercars.com)

I'm Rika, the author of this article. Ever since Porsche 911 became my favorite car, I've become totally addicted to Porsche, and I can't stop loving Porsche, so I started this blog. My favorite cars are 911 Carrera (991.2), 911 Carrera Cabriolet (992.1), and 911 Carrera T (992.1).