2.2 HDi torque reaction mount

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GiveMeABreak
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Re: 2.2 HDi torque reaction mount

Post by GiveMeABreak »

I forgot to mention the the DW12C specific engine only on the C5 X7, has an ECU controlled active damper system for the engine. On the 3.0 version there is a Carlos Fandango system using EGR valves 🤪

jml
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Re: 2.2 HDi torque reaction mount

Post by jml »

Hi Marc & Chris,

Thanks for your further thoughts and advice and sorry for not replying earlier. I spent all of yesterday under my car in the sweltering heat trying to find any other causes of my vibration/shudder and I was absolutely shattered last night !

Interesting to hear that cooled mountings were used on the XM as well. I ran the car with the air con on and the undertray removed and there was a fair bit of air issuing from that outlet - that would then normally go through the tube to the mount. As I mentioned, I often run the car without air con so maybe I should use it a bit more after I replace the mount.

Love the Carlos Fandango reference Marc :) and wow, with ECU controlled active dampers and air conditioned mountings, we’ll be having cars that drive themselves next.....oh err.........we have already !

As you say Chris, the engine pivots and I tried to measure how much. Difficult to get a protractor anywhere ;) but the metal part that protrudes from the bottom mount bracket moves about 2cms. The thing I find slightly odd is that the upper torque rod is fixed so close to the right hand engine mount that there is little or no movement for it to resist there, so it would seem the bottom one does most of the work.

Ah well, thanks again. I see when the garage changed the mount a couple of years ago it was only about £30 and has doubled in cost since ! At least, this time, I’ll do it myself so won’t have to pay any labour !

Cheers

Julian

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Re: 2.2 HDi torque reaction mount

Post by GiveMeABreak »

Just in case you are interested Julian, this is the system fitted for the DW12C engine on the X7:
JML Eng A.PNG
(1) Is the Damper Electronic Unit
(3) Is the Active Damper Actuator

... and on the 3.0 HDi
JML Eng B.PNG
(1) & (2) EGR Control Vacuum pipes
(4) Vacuum Reserve

So whether this has some sort of pneumatic cushioning hovercraft inflatable whatsitsname thingy... hence the Carlos Fandango inference...

jml
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Re: 2.2 HDi torque reaction mount

Post by jml »

“So whether this has some sort of pneumatic cushioning hovercraft inflatable whatsitsname thingy... hence the Carlos Fandango inference...” Love it :)

Wow, and I thought mine was a bit complex !

Thanks for all your help everyone.