Not move to install, move under driving conditions. I guess the exhaust system expands with heat but wouldn’t think enough to cause silver area in pics. Transmission mount and engine mounts (as far as I can see) look good. No engine twist seen when revving engine with bonnet open.


Other side same

Other side same

 

I understand what you are asking. Like you I would not expect the exhaust system to move from side to side to such an extend that it would polish the metal pins, from where it hangs suspended. The logical step from here is to jack the car up on stands and crawl underneath and try to move the exhaust system from side to side by hand and hopefully you will notice somewhere something, which is missing, which was supposed to prevent that exact movement...

 

Should have mentioned those pics are on a lift and with all my strength could not move exhaust.

 

Yes the entire exhaust moves under the car when driving etc. Even as rigid as your exhaust feels when you tug on it when your cars is on a lift. The forces acting on the exhaust system, and your car when driving down the road are quite a bit more intense. Seeing polished pins such as your's are an indication you may have an engine or transmission mount which is worn, and allowing the engine and trans to shift and move while under the forces of accelerating and braking. Which I assure you can not be easily duplicated, by tugging on the exhaust while on a lift. This will usually take a large pry bar wedged in between the frame and each mount itself to find the worn part/mount, a slight movement is normal but much more then an 1/8 to a 1/4 of an inch should probably be replaced (some shouldn't move at all). Hope it helps.

Jack

 

Thanks. I’ll try that. 189k miles so maybe in need of new motor mounts.

 

Mine appear to move. Could be a fun project for an action camera, catching it in the act.

 

The exhaust mounts on top of the rear subframe cause the most noise when going over bumps. It’s also a large chunk of rubber that solidifies and causes the noise.

 

Exhaust moves but not that much, this is an effect of exhaust pushed inward while backing the car and slamming muffler against obstacle. Yours 944play barely hangs on its hanger

 

They move. And when the rubber insulators dry up, they rattle -- a lot! Especially when it is freezing out. They are cheap -- but difficult to remove (easier with car resting on the tires). But just a little silicon spray quiets them down.

I was pretty sure my noise was dried out isolators and rear shock mounts: nope, exhaust mounts. Silicon spray shut them up. I have replacements but lack the finger strength nor resolve to remove the old ones while lying on my back (83 years).

 

You have to remember that the entire engine/trans moves fore/aft on rubber mounts when driving as well as body and subframe flex.

 

That's true.....I suspect the planned longevity of these isolators has been exceeded
by many years. I also suspect the side motion G forces on some of our forum member
cars are much greater than they are on other members' Jaguars. Our ladies almost ask
to be pushed ...sometimes.

 

I have stainless steel exhaust. Stainless seems to stretch a lot when it gets hot. Rear hangers do not have dust on them at least 4cm of travel.