Finding Exhaust Leaks - JeepForum.com
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post #1 of 13 Old 08-12-2020, 04:20 PM Thread Starter
Kiwi_TJ
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1997 TJ Wrangler 
 
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Finding Exhaust Leaks

Hi There,


I have a leak in my exhaust, which I think is just the donut between the header and the down pipe, because the bolts rattled loose and I just nipped them up again instead of replacing the donut.




But I thought that I should double check the source of the leak before I pull it apart so is there a good way to do this? Can you spray water and dishwash liquid on it and look for bubbles or anything like that?


1997 TJ Soft Top/ Half Doors
4.0 I6 with 5 Speed Manual | K&N Panel Filter | D30/D44 | 3.07 Gears | Banks Torque Tube Header
31*10.5 R15 Maxxis Trepador Radial Tyres | 2" BDS Spring Lift | Bilstein 5100 Shocks | JKS Discos | JKS Rear Swaybar Links | 100W Narva Spotlights
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post #2 of 13 Old 08-13-2020, 08:18 AM
Mousejockey
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Loosen the bolts, realign the pipe to be square with the manifold, then tighten each nut a little at a time to pull the pipe evenly to the manifold.
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post #3 of 13 Old 08-13-2020, 08:55 AM
2jhanna
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Don't know if it's different by year/engine/etc, but I recently had my Y pipe down, and was surprised there were no donuts or gaskets of any type. Just the taper and flaring of the mating ends.

And, as stated above, once I got all bolts started, I gradually snugged up on them a little at a time, in turn, until all snug, then even torqued each one at a lower setting and final at the spec setting.
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denton county, tx
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post #4 of 13 Old 08-17-2020, 06:41 PM Thread Starter
Kiwi_TJ
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I have been looking over a few threads on exhaust leaks. A number of them say that replacing the motor mounts is a good idea to reduce things moving around stressing the welds.


Any advice of which motor mounts are the best for replacements?

1997 TJ Soft Top/ Half Doors
4.0 I6 with 5 Speed Manual | K&N Panel Filter | D30/D44 | 3.07 Gears | Banks Torque Tube Header
31*10.5 R15 Maxxis Trepador Radial Tyres | 2" BDS Spring Lift | Bilstein 5100 Shocks | JKS Discos | JKS Rear Swaybar Links | 100W Narva Spotlights
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post #5 of 13 Old 08-18-2020, 08:22 AM
LumberjackLloyd
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Quote:
Originally Posted by Kiwi_TJ View Post
I have been looking over a few threads on exhaust leaks. A number of them say that replacing the motor mounts is a good idea to reduce things moving around stressing the welds.


Any advice of which motor mounts are the best for replacements?
Brown dog is a very popular option.
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post #6 of 13 Old 08-18-2020, 08:48 AM
Mousejockey
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Quote:
Originally Posted by LumberjackLloyd View Post
Brown dog is a very popular option.
I have the BD mounts, they are OK
However I now think that the riser block style, under a factory mount would be the better option.
Factory mounts give better isolation than the aftermarket rubber/poly ones
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post #7 of 13 Old 08-18-2020, 04:01 PM Thread Starter
Kiwi_TJ
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I have been reading a few reviews on the M.O.R.E Torsion Rubber Mounts, anyone have any experience with these compared to the Brown Dog ones?


I am keen for some with good isolation, rather than poly mounts as it is my daily driver.

1997 TJ Soft Top/ Half Doors
4.0 I6 with 5 Speed Manual | K&N Panel Filter | D30/D44 | 3.07 Gears | Banks Torque Tube Header
31*10.5 R15 Maxxis Trepador Radial Tyres | 2" BDS Spring Lift | Bilstein 5100 Shocks | JKS Discos | JKS Rear Swaybar Links | 100W Narva Spotlights
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post #8 of 13 Old 08-18-2020, 08:36 PM
Vinman
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Quote:
Originally Posted by Kiwi_TJ View Post
Hi There,






But I thought that I should double check the source of the leak before I pull it apart so is there a good way to do this? Can you spray water and dishwash liquid on it and look for bubbles or anything like that?
Take a shop-vac, connect the hose to the exhaust side so it blows instead of sucks, stick the hose up the tailpipe and spray all the exhaust connections with a dish soap/water mixture and look for bubbles.
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post #9 of 13 Old 08-18-2020, 09:01 PM
2jhanna
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Quote:
Originally Posted by Vinman View Post
Take a shop-vac, connect the hose to the exhaust side so it blows instead of sucks, stick the hose up the tailpipe and spray all the exhaust connections with a dish soap/water mixture and look for bubbles.
Neat trick. But does it cause the engine to rotate backwards
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post #10 of 13 Old 08-19-2020, 07:06 AM
Vinman
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Neat trick. But does it cause the engine to rotate backwards
Also gives you 5 reverse and 1 forward gear🤪
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post #11 of 13 Old 08-19-2020, 04:38 PM
willis36
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You can suck a small amount of atf through the intake, that will reveal any leaks in a hurry, just dont do to much. I had the MORE engine mounts for a long time, they are nice but you will have more vibration, mainly at idle, than the stock mounts. I went back to stock when I did my Savvy under armor and noticed it smooth out.
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post #12 of 13 Old 09-02-2020, 04:07 PM Thread Starter
Kiwi_TJ
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How tight do you do up these exhaust flange bolts? I know the manual says 23 ft-lb, but no way I can get the torque wrench in there. So do you just snug the bolts up or really wail on them to get the FT?

1997 TJ Soft Top/ Half Doors
4.0 I6 with 5 Speed Manual | K&N Panel Filter | D30/D44 | 3.07 Gears | Banks Torque Tube Header
31*10.5 R15 Maxxis Trepador Radial Tyres | 2" BDS Spring Lift | Bilstein 5100 Shocks | JKS Discos | JKS Rear Swaybar Links | 100W Narva Spotlights
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post #13 of 13 Old 09-02-2020, 04:19 PM
2jhanna
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I used a torque wrench. I had already stacked up a variety of extensions and swivels just to get the bolts in, pretty easy at that point to switch to torque wrench

And I did mine in 3-4 steps to insure both sides were the same.

I am multi-talented, I can talk and piss you off at the same time.

jhanna
denton county, tx
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