Exhaust pipe bolts on '89 YJ
 

I'm going to replace the exhaust pipe on my '89 YJ 4.2.
I was told the only way to get the nuts off is with a torch.
i.e.. Heat them to cherry red and then try to get them off.
Will the studs be useable after this or must I replace them
also. Also, there is NO gasket between the exhaust pipe
and manifold, correct?
Thanks,
Joe

Re: Exhaust pipe bolts on '89 YJ
 

Joe C did pass the time by typing:
> I'm going to replace the exhaust pipe on my '89 YJ 4.2.
> I was told the only way to get the nuts off is with a torch.
> i.e.. Heat them to cherry red and then try to get them off.
> Will the studs be useable after this or must I replace them
> also. Also, there is NO gasket between the exhaust pipe
> and manifold, correct?

Depends on the connection. I'm talking from my ZJ here
but your exhaust header should be similar.

Between the exhaust pipe and manifold there is usually a lead
o-ring V shaped thingy. That should be replaced. The bolts
are usually so buggered up from heat that a angle grinder is
the easier way to get them off. I got mine off the 93ZJ with
a long extension and a breaker bar. The rest of the exhaust
came out with an angle grinder and strap-pipecutter.

Start first by blasting all the bolts with PB-Blaster then
wait a day before cranking on them.

--
DougW

Re: Exhaust pipe bolts on '89 YJ
 

Joe C did pass the time by typing:
> I'm going to replace the exhaust pipe on my '89 YJ 4.2.
> I was told the only way to get the nuts off is with a torch.
> i.e.. Heat them to cherry red and then try to get them off.
> Will the studs be useable after this or must I replace them
> also. Also, there is NO gasket between the exhaust pipe
> and manifold, correct?

Depends on the connection. I'm talking from my ZJ here
but your exhaust header should be similar.

Between the exhaust pipe and manifold there is usually a lead
o-ring V shaped thingy. That should be replaced. The bolts
are usually so buggered up from heat that a angle grinder is
the easier way to get them off. I got mine off the 93ZJ with
a long extension and a breaker bar. The rest of the exhaust
came out with an angle grinder and strap-pipecutter.

Start first by blasting all the bolts with PB-Blaster then
wait a day before cranking on them.

--
DougW

Re: Exhaust pipe bolts on '89 YJ
 

Joe C did pass the time by typing:
> I'm going to replace the exhaust pipe on my '89 YJ 4.2.
> I was told the only way to get the nuts off is with a torch.
> i.e.. Heat them to cherry red and then try to get them off.
> Will the studs be useable after this or must I replace them
> also. Also, there is NO gasket between the exhaust pipe
> and manifold, correct?

Depends on the connection. I'm talking from my ZJ here
but your exhaust header should be similar.

Between the exhaust pipe and manifold there is usually a lead
o-ring V shaped thingy. That should be replaced. The bolts
are usually so buggered up from heat that a angle grinder is
the easier way to get them off. I got mine off the 93ZJ with
a long extension and a breaker bar. The rest of the exhaust
came out with an angle grinder and strap-pipecutter.

Start first by blasting all the bolts with PB-Blaster then
wait a day before cranking on them.

--
DougW

Re: Exhaust pipe bolts on '89 YJ
 

Joe C did pass the time by typing:
> I'm going to replace the exhaust pipe on my '89 YJ 4.2.
> I was told the only way to get the nuts off is with a torch.
> i.e.. Heat them to cherry red and then try to get them off.
> Will the studs be useable after this or must I replace them
> also. Also, there is NO gasket between the exhaust pipe
> and manifold, correct?

Depends on the connection. I'm talking from my ZJ here
but your exhaust header should be similar.

Between the exhaust pipe and manifold there is usually a lead
o-ring V shaped thingy. That should be replaced. The bolts
are usually so buggered up from heat that a angle grinder is
the easier way to get them off. I got mine off the 93ZJ with
a long extension and a breaker bar. The rest of the exhaust
came out with an angle grinder and strap-pipecutter.

Start first by blasting all the bolts with PB-Blaster then
wait a day before cranking on them.

--
DougW

Re: Exhaust pipe bolts on '89 YJ
 

You can soak the nuts in a good penetrating oil. I recommend a couple
days of many soaks.

I then try a 6 sided deep socket on them first. Do not use a 12 point
socket or you will round them off. This 'might' work depending on their
shape. If not, then it is torch time. I recommend you go after the
stud/manifold junction just to save farting around. If you have to
torch the nuts, 99% the studs will not be reusable, but there always is
that 1%...

New stud and brass nut kits are sold at most auto parts stores and are
not expensive.

The 'newer' 4.2 manifold does not use a gasket. Some of the 1st
generation did.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)


Joe C wrote:
>
> I'm going to replace the exhaust pipe on my '89 YJ 4.2.
> I was told the only way to get the nuts off is with a torch.
> i.e.. Heat them to cherry red and then try to get them off.
> Will the studs be useable after this or must I replace them
> also. Also, there is NO gasket between the exhaust pipe
> and manifold, correct?
> Thanks,
> Joe

Re: Exhaust pipe bolts on '89 YJ
 

You can soak the nuts in a good penetrating oil. I recommend a couple
days of many soaks.

I then try a 6 sided deep socket on them first. Do not use a 12 point
socket or you will round them off. This 'might' work depending on their
shape. If not, then it is torch time. I recommend you go after the
stud/manifold junction just to save farting around. If you have to
torch the nuts, 99% the studs will not be reusable, but there always is
that 1%...

New stud and brass nut kits are sold at most auto parts stores and are
not expensive.

The 'newer' 4.2 manifold does not use a gasket. Some of the 1st
generation did.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)


Joe C wrote:
>
> I'm going to replace the exhaust pipe on my '89 YJ 4.2.
> I was told the only way to get the nuts off is with a torch.
> i.e.. Heat them to cherry red and then try to get them off.
> Will the studs be useable after this or must I replace them
> also. Also, there is NO gasket between the exhaust pipe
> and manifold, correct?
> Thanks,
> Joe

Re: Exhaust pipe bolts on '89 YJ
 

You can soak the nuts in a good penetrating oil. I recommend a couple
days of many soaks.

I then try a 6 sided deep socket on them first. Do not use a 12 point
socket or you will round them off. This 'might' work depending on their
shape. If not, then it is torch time. I recommend you go after the
stud/manifold junction just to save farting around. If you have to
torch the nuts, 99% the studs will not be reusable, but there always is
that 1%...

New stud and brass nut kits are sold at most auto parts stores and are
not expensive.

The 'newer' 4.2 manifold does not use a gasket. Some of the 1st
generation did.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)


Joe C wrote:
>
> I'm going to replace the exhaust pipe on my '89 YJ 4.2.
> I was told the only way to get the nuts off is with a torch.
> i.e.. Heat them to cherry red and then try to get them off.
> Will the studs be useable after this or must I replace them
> also. Also, there is NO gasket between the exhaust pipe
> and manifold, correct?
> Thanks,
> Joe

Re: Exhaust pipe bolts on '89 YJ
 

You can soak the nuts in a good penetrating oil. I recommend a couple
days of many soaks.

I then try a 6 sided deep socket on them first. Do not use a 12 point
socket or you will round them off. This 'might' work depending on their
shape. If not, then it is torch time. I recommend you go after the
stud/manifold junction just to save farting around. If you have to
torch the nuts, 99% the studs will not be reusable, but there always is
that 1%...

New stud and brass nut kits are sold at most auto parts stores and are
not expensive.

The 'newer' 4.2 manifold does not use a gasket. Some of the 1st
generation did.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)


Joe C wrote:
>
> I'm going to replace the exhaust pipe on my '89 YJ 4.2.
> I was told the only way to get the nuts off is with a torch.
> i.e.. Heat them to cherry red and then try to get them off.
> Will the studs be useable after this or must I replace them
> also. Also, there is NO gasket between the exhaust pipe
> and manifold, correct?
> Thanks,
> Joe

Re: Exhaust pipe bolts on '89 YJ
 

With a torch, heat the nuts 'til they're cherry red, and turn 'em off.

To remove studs, heat the area around the stud, but not directly the stud,
and turn it out.

Spdloader



"Joe C" <no-more-spam@no-spam.com> wrote in message
news:2%pPf.131$cv4.94@fe11.lga...
> I'm going to replace the exhaust pipe on my '89 YJ 4.2.
> I was told the only way to get the nuts off is with a torch.
> i.e.. Heat them to cherry red and then try to get them off.
> Will the studs be useable after this or must I replace them
> also. Also, there is NO gasket between the exhaust pipe
> and manifold, correct?
> Thanks,
> Joe
>
>