Exhaust Clearance
 

Hey folks,

Things are going sweet in my new (to me) Jeep. The guy I bought it off
just had a new cat back Dynamax installed.

Over every bump comes the rattle/clunk from the rear. On some
startups, there is a clunk sounding like the exhaist hitting the floor
dead center of the Jeep.

Now I jumped under there and noticed the tailpipe is hitting / rubbing
the rear leaf, and the section that goes over the axle is about a half
inch from the floor of the Jeep.

The clearance is very, very tight between the leaf and the gas tank
skid plate. (1/2" on either side)

My question is:

Is it kosher to fabricate a rubber "donut" of sorts to act as a buffer
between the pipe and the leaf and the pipe and the floor. How hot does
that pipe get?

Do they sell "lowering" rubber hangers? The very end of the tailpipe
has a metal hanger supporting a metal support rod off the pipe...
leading to the never ending metal on metal squeak that I remedied by
slipping a rubber tube over the rod...but why the hell would they have
metal on metal with a moving part?!?!


Thanks,

~Jon

my stats:
91 YJ 4.0 auto
shackles giving about 1.5" lift

Re: Exhaust Clearance
 

Jon wrote:
> Hey folks,

> Now I jumped under there and noticed the tailpipe is hitting / rubbing
> the rear leaf, and the section that goes over the axle is about a half
> inch from the floor of the Jeep.
>
> The clearance is very, very tight between the leaf and the gas tank
> skid plate. (1/2" on either side)
>
> My question is:
>
> Is it kosher to fabricate a rubber "donut" of sorts to act as a buffer
> between the pipe and the leaf and the pipe and the floor. How hot does
> that pipe get?

hot enough to melt a rubber donut. Concentrate on the hangers and get
them aligned properly.

> Do they sell "lowering" rubber hangers? The very end of the tailpipe
> has a metal hanger supporting a metal support rod off the pipe...
> leading to the never ending metal on metal squeak that I remedied by
> slipping a rubber tube over the rod...but why the hell would they have
> metal on metal with a moving part?!?!

The rubber isolator fell out when they did the cat-back and never got
put back in. They make several types. A local muffler shop will have
plenty and might even have a hanger they can thow in for you. If not,
the "help" section in pepboys or autozone will have the isolator.

--
DougW

Re: Exhaust Clearance
 

Jon wrote:
> Hey folks,

> Now I jumped under there and noticed the tailpipe is hitting / rubbing
> the rear leaf, and the section that goes over the axle is about a half
> inch from the floor of the Jeep.
>
> The clearance is very, very tight between the leaf and the gas tank
> skid plate. (1/2" on either side)
>
> My question is:
>
> Is it kosher to fabricate a rubber "donut" of sorts to act as a buffer
> between the pipe and the leaf and the pipe and the floor. How hot does
> that pipe get?

hot enough to melt a rubber donut. Concentrate on the hangers and get
them aligned properly.

> Do they sell "lowering" rubber hangers? The very end of the tailpipe
> has a metal hanger supporting a metal support rod off the pipe...
> leading to the never ending metal on metal squeak that I remedied by
> slipping a rubber tube over the rod...but why the hell would they have
> metal on metal with a moving part?!?!

The rubber isolator fell out when they did the cat-back and never got
put back in. They make several types. A local muffler shop will have
plenty and might even have a hanger they can thow in for you. If not,
the "help" section in pepboys or autozone will have the isolator.

--
DougW

Re: Exhaust Clearance
 

Jon wrote:
> Hey folks,

> Now I jumped under there and noticed the tailpipe is hitting / rubbing
> the rear leaf, and the section that goes over the axle is about a half
> inch from the floor of the Jeep.
>
> The clearance is very, very tight between the leaf and the gas tank
> skid plate. (1/2" on either side)
>
> My question is:
>
> Is it kosher to fabricate a rubber "donut" of sorts to act as a buffer
> between the pipe and the leaf and the pipe and the floor. How hot does
> that pipe get?

hot enough to melt a rubber donut. Concentrate on the hangers and get
them aligned properly.

> Do they sell "lowering" rubber hangers? The very end of the tailpipe
> has a metal hanger supporting a metal support rod off the pipe...
> leading to the never ending metal on metal squeak that I remedied by
> slipping a rubber tube over the rod...but why the hell would they have
> metal on metal with a moving part?!?!

The rubber isolator fell out when they did the cat-back and never got
put back in. They make several types. A local muffler shop will have
plenty and might even have a hanger they can thow in for you. If not,
the "help" section in pepboys or autozone will have the isolator.

--
DougW

Re: Exhaust Clearance
 

"Jon" <campingisgood@gmail.com> wrote in message
news:1176333988.535437.95840@d57g2000hsg.googlegro ups.com...
> Hey folks,
>
> Things are going sweet in my new (to me) Jeep. The guy I bought it off
> just had a new cat back Dynamax installed.
>
> Over every bump comes the rattle/clunk from the rear. On some
> startups, there is a clunk sounding like the exhaist hitting the floor
> dead center of the Jeep.
>
> Now I jumped under there and noticed the tailpipe is hitting / rubbing
> the rear leaf, and the section that goes over the axle is about a half
> inch from the floor of the Jeep.
>
> The clearance is very, very tight between the leaf and the gas tank
> skid plate. (1/2" on either side)
>
> My question is:
>
> Is it kosher to fabricate a rubber "donut" of sorts to act as a buffer
> between the pipe and the leaf and the pipe and the floor. How hot does
> that pipe get?
>
> Do they sell "lowering" rubber hangers? The very end of the tailpipe
> has a metal hanger supporting a metal support rod off the pipe...
> leading to the never ending metal on metal squeak that I remedied by
> slipping a rubber tube over the rod...but why the hell would they have
> metal on metal with a moving part?!?!
>
>
> Thanks,
>
> ~Jon
>
> my stats:
> 91 YJ 4.0 auto
> shackles giving about 1.5" lift
>

Take it to a muffler shop you can trust, and let them cure your headache for
you.
It'll be worth it not to have to screw with an exhaust rattle in your
driveway, on your back.
Like Doug said, they should have the correct hanger isolator in stock, and
it should be pretty cheap too.

Spdloader

Re: Exhaust Clearance
 

"Jon" <campingisgood@gmail.com> wrote in message
news:1176333988.535437.95840@d57g2000hsg.googlegro ups.com...
> Hey folks,
>
> Things are going sweet in my new (to me) Jeep. The guy I bought it off
> just had a new cat back Dynamax installed.
>
> Over every bump comes the rattle/clunk from the rear. On some
> startups, there is a clunk sounding like the exhaist hitting the floor
> dead center of the Jeep.
>
> Now I jumped under there and noticed the tailpipe is hitting / rubbing
> the rear leaf, and the section that goes over the axle is about a half
> inch from the floor of the Jeep.
>
> The clearance is very, very tight between the leaf and the gas tank
> skid plate. (1/2" on either side)
>
> My question is:
>
> Is it kosher to fabricate a rubber "donut" of sorts to act as a buffer
> between the pipe and the leaf and the pipe and the floor. How hot does
> that pipe get?
>
> Do they sell "lowering" rubber hangers? The very end of the tailpipe
> has a metal hanger supporting a metal support rod off the pipe...
> leading to the never ending metal on metal squeak that I remedied by
> slipping a rubber tube over the rod...but why the hell would they have
> metal on metal with a moving part?!?!
>
>
> Thanks,
>
> ~Jon
>
> my stats:
> 91 YJ 4.0 auto
> shackles giving about 1.5" lift
>

Take it to a muffler shop you can trust, and let them cure your headache for
you.
It'll be worth it not to have to screw with an exhaust rattle in your
driveway, on your back.
Like Doug said, they should have the correct hanger isolator in stock, and
it should be pretty cheap too.

Spdloader

Re: Exhaust Clearance
 

"Jon" <campingisgood@gmail.com> wrote in message
news:1176333988.535437.95840@d57g2000hsg.googlegro ups.com...
> Hey folks,
>
> Things are going sweet in my new (to me) Jeep. The guy I bought it off
> just had a new cat back Dynamax installed.
>
> Over every bump comes the rattle/clunk from the rear. On some
> startups, there is a clunk sounding like the exhaist hitting the floor
> dead center of the Jeep.
>
> Now I jumped under there and noticed the tailpipe is hitting / rubbing
> the rear leaf, and the section that goes over the axle is about a half
> inch from the floor of the Jeep.
>
> The clearance is very, very tight between the leaf and the gas tank
> skid plate. (1/2" on either side)
>
> My question is:
>
> Is it kosher to fabricate a rubber "donut" of sorts to act as a buffer
> between the pipe and the leaf and the pipe and the floor. How hot does
> that pipe get?
>
> Do they sell "lowering" rubber hangers? The very end of the tailpipe
> has a metal hanger supporting a metal support rod off the pipe...
> leading to the never ending metal on metal squeak that I remedied by
> slipping a rubber tube over the rod...but why the hell would they have
> metal on metal with a moving part?!?!
>
>
> Thanks,
>
> ~Jon
>
> my stats:
> 91 YJ 4.0 auto
> shackles giving about 1.5" lift
>

Take it to a muffler shop you can trust, and let them cure your headache for
you.
It'll be worth it not to have to screw with an exhaust rattle in your
driveway, on your back.
Like Doug said, they should have the correct hanger isolator in stock, and
it should be pretty cheap too.

Spdloader

Re: Exhaust Clearance
 

Thanks for the heads-up fellas!

The rattle is driving me batty. I'll pull into the muffler guy and
have him take a look-see this weekend.



~Jon

Re: Exhaust Clearance
 

Thanks for the heads-up fellas!

The rattle is driving me batty. I'll pull into the muffler guy and
have him take a look-see this weekend.



~Jon

Re: Exhaust Clearance
 

Thanks for the heads-up fellas!

The rattle is driving me batty. I'll pull into the muffler guy and
have him take a look-see this weekend.



~Jon