Ok, Im going to watch it again & again that is a strange sound ...

 

This sounds like one of the CV axles are going bad. These are the units with the rubber boots on them inside and outside going to the wheel. Grab each one when the car is on a lift and see if there is torsional or rotational movement. They should be rock solid very little play.

 

@1eapplebaum if I put the car on lift then put it in D then make the wheel move.. it doesn't make that sound at all...
only when moving on the road.. as long as hit 5mph it clunk clunk then disappear... if I put the car IN REVERSE same noise... in Neutral same noise...
how can I check the CV do I need to disassembly it?

 

The CV joint won't make noise unless it's on the road with load if it's bad.

With the car up on a hoist grab the shaft push up and down and then twist back and forth. The car should be in park. Should there be any more than a tiny bit of play the unit is bad and needs to get rebuilt or replaced. Depending on how bad it is there are rebuild kits available. The rebuild kit chase is similar to what you just did with the front wheel bearing. Bentley sells the rebuild kit, however expensive for what you get.

 

@1eapplebaum DO u think the audi A8 one will fit it? or the RMT one?
it little smaller in the diameter but I'm not running that fast So I guess it is ok as long as it fit?
thank
one more question : if the CV axle going bad it should make sound at all speed right?
why only at slow acc 5mph thanks

 

They usually start out making noise at slow speeds backing up and moving forward.

Look on Flying Spares website to get the part number for the CV shaft. Then go online with that part number and cross-reference it to Volkswagen Phaeton W12 or Audi A8 W12.

Don't buy from RMT they're doing the same thing you're about to do. You'll just pay more for the same part.

 

 

Your up early Mr Jones ... Ive just released its not you its me its probably only around 11pm where you are ...

 

I have listened to the video many times, I even posted on Facebook and got some views, but no answers, what is sticking out to me is the fact you put the car on the lift in drive and had no noise, now to load the CV joints while on the lift in drive, you could apply the brakes lightly to simulate load somewhat, being you have no noise on the lift, I thinking that rules out the brake pads, rotors, driveshaft, etc., BUT, how about the subframe itself, how are the bushings there, your picture shows some piece of one missing, and being you say it is when you are on and off the throttle at very slow speed could it be the subframe shifting....

Just some thoughts.

 

@Johnny Hotspur GT nice, Tomorrow I will check that bushing..
what is the part missing there? would u please take a picture for me?
Thank you alot

 

How many km on the Bentley Spur?


While investigating the subframe bushings and the CV axles make a YouTube video going slowly over all the components on the rear of the car. We will look at them carefully.

The reality is there are multiple components that can clunk. Among other components are the sway bar bushings , even the bushing that carries the rear differential. Indeed subframe bushings on German cars are notorious for separating.

 

@1eapplebaum the car got 50.000 miles on it which equal 83.000 km..
Tomorrow I will put the car on Lift then start recording the Video for you guy to see...

 

I finally went to sleep at 3am(like 9am your time). Was up trying to plan out my audio system on paper 😂.

 

Also try doing what Mr. Johnny Hotspur suggested let the car idle in drive on the lift , be careful, and tap the brakes show us the video of that. You will want to capture an image of the rear axle shafts turning and then periodically stopping.

 

Wow thats a late but not for me most nights Im up till 3 ish ... Ahh finally you getting it done fantastic, I cant wait to see the audio up & running, If Im right you, British & myself all started around the same time, British got his completed before me so yah looking forward to seeing same pics or a video ...