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Unread 04-24-2011, 02:51 PM   #1
man44a
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1997 TJ Wrangler 
 
Join Date: Mar 2011
Location: Murfreesboro, Tennessee
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Brown Dog MM and 2.5L?

Does anyone else have the Brown Dog Motor Mounts and the 2.5L engine? I just got mine installed along with body lift and OME lift. The engine now has a really bad sound at around 3000rpms. It sounds like an import with those big exhausts.

Im wondering if anyone else has put this on their jeep and had this problem? I thought it could be a hole in the muffler, but the shop that did the lift says its due to the mounts. I was expecting more engine vibes, but this sound is aweful. I am using the rubber, not polyurethane.

Any similar experiences with other brand MM's?
Any other ideas what would cause this?

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Unread 04-24-2011, 03:00 PM   #2
GOLENJEEPTJ
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I have the 4.0 with Brown Dog rubber mounts and there are no vibes what so ever.Personally I think your shop is full of it... putting the blame on your Brown Dog motor mounts!Are they the standard mounts or lifted?
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Unread 04-24-2011, 03:00 PM   #3
man44a
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The lifted mounts
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Unread 04-24-2011, 03:00 PM   #4
GOLENJEEPTJ
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Also you really need to fill in your profile.
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Unread 04-24-2011, 08:27 PM   #5
man44a
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Solved!!!

So the noise was coming from the motor mounts. I loosened the through bolts and when I did, noise is gone. Now I tightened them back without torque wrench and I can still barely hear it.

How loose can I make the through bolt without it causing a problem?
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Unread 04-24-2011, 08:39 PM   #6
Prunetuck4X4
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1997 TJ Wrangler 
 
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Location: Prunedale, CA
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Loose motor mount bolts are NOT the way i would want to solve a problem regardless of the situation that would be my LAST option to resolve the problem. Just sayin'.
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Unread 04-24-2011, 08:48 PM   #7
danb303
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THose bolts are not supposed to be real tight. I did the same thing on my old jeep and had to go back a torque them to spec. If you tighten them too tight they clamp the metal bushing and then you basically have metal on metal mounts.

check the torque specs. I can't remember but I am thinking it's 30 ft lbs???
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Unread 04-26-2011, 07:35 AM   #8
Brown Dog
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If the locknut is in good condition, you can have it as loose as you need it to stop the vibration until you find the source of the problem. I have new locknuts if you need, but can't find one.
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