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Unread 07-20-2014, 08:29 PM   #1
PolishRedneck
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1998 ZJ 
 
Join Date: Jul 2014
Location: Chicago, IL
Posts: 60
exhaust problem i think?

I just replaced my exhaust manifold and it was running good until later on in the day.. when I shut the truck off the exhaust rattles

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Unread 07-20-2014, 08:49 PM   #2
ZeeJay1997
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1997 ZJ 
 
Join Date: Dec 2008
Location: Sweet Home, Alabama
Posts: 6,880
the exhaust can rattle in a lot of places.

the bolts at the flange are hard to torque, you may need to torque them while it's hot to get them to hold. most of the time you have to do some persuading to get it to line up.

did you torque the manifold bolts to spec?
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Unread 07-20-2014, 10:12 PM   #3
PolishRedneck
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1998 ZJ 
 
Join Date: Jul 2014
Location: Chicago, IL
Posts: 60
the rattle is coming more from the tail pipe area. The flange is tightened as much as i could get it.. And yes the manifold bolts are torqued to 24-26
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Unread 07-21-2014, 01:49 AM   #4
Uniblurb
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1996 ZJ 
 
Join Date: Jan 2012
Location: Central, Ohio
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The most likely place for a rattle in the tailpipe area is when it's up against the fuel tank metal heat shield. Did you loosen up the hanger/exhaust brace on the cross-member near the back of the front pipe or anything else on the exhaust when replacing the manifold? Also make sure the very rear hanger on the tailpipe is good pulling it away from the fuel tank shield. I've had to get a new rubber donut if stock or some other type of universal hanger adjusting it further away before.

Sometimes the tailpipe can rattle against the rear sway bar as the pipe loops over it but more likely it's the fuel tank heat shield.
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Unread 07-21-2014, 03:30 PM   #5
zjosh93
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1993 ZJ 
 
Join Date: Aug 2010
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On the 2.5" tail pipe I have the closest places to touching are the heat shield, the track bar, and the sway bar. I had to heat and bend the rear hanger on the tailpipe to move everything toward the outside of the Jeep so it would have good clearance all around. Now I can grab the tailpipe and push/pull in any direction with no problems. The OE rear hanger on mine is silicone rubber; still as good as the day it left the factory despite being 21 years old.
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4.0 , exhaust , exhaust manifold

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