Motor mount/Tranny mount problem after collision
#11
No, it was my fault and my insurance accepted liability already. We were taking off from a stop light and all of a sudden the car in front of me stopped, I didn't in time. I was only traveling maybe 10 mph.
So the symptoms are that there is a vibration at idle and at low speeds. It does not stop if I am In neutral or even if I put the TC into neutral. I believe something has shifted, just not sure what. Maybe motor mounts? Not too sure the best way to see them. I assume under, but I couldn't really locate them while I was under there. (Jeep was still hot and didn't have it jacked up) I won't be able to look tonight, but I have a buddy coming over tomorrow to help diagnose.
Thanks again for any more info or details on where to look!
So the symptoms are that there is a vibration at idle and at low speeds. It does not stop if I am In neutral or even if I put the TC into neutral. I believe something has shifted, just not sure what. Maybe motor mounts? Not too sure the best way to see them. I assume under, but I couldn't really locate them while I was under there. (Jeep was still hot and didn't have it jacked up) I won't be able to look tonight, but I have a buddy coming over tomorrow to help diagnose.
Thanks again for any more info or details on where to look!
#12
It doesn't look like yours have shifted, you'd see pronounced corrosion in the form of a circle towards the rear if they had shifted. Do you have more details to where we could try to help you diagnose or are you still in that litigation period where you're not supposed to publicly/ privately discuss it? AND even then.....please bear in mind that you're still on the hook for a short while afterwards so you've got to use select terminology when describing the incident. We're here to help, but it doesn't look like you've got what I had. Mine was a rear end collision with another vehicle traveling at highway speeds. Jeep stopped, motor and trans slid forward.
Thanks again for any help!
#13
Nope, no harm in moving the mount to see what happens. I didn't use a torque wrench on mine either, just kinda go until they're nice and snug. I would shy away from an impact because I'd hate to tear one free from the rubber isolator. I think they're pressed into the base of the isolator, but it's been a while.
#14
Nope, no harm in moving the mount to see what happens. I didn't use a torque wrench on mine either, just kinda go until they're nice and snug. I would shy away from an impact because I'd hate to tear one free from the rubber isolator. I think they're pressed into the base of the isolator, but it's been a while.
Wait, before I attempt this, I am trying to move the transmission itself back towards the rear just a little bit, right? Not just the trans mount? Again, sorry for all the questions, and thanks for the help!
#15
The mount is bolted to both the transmission as well as the crossmember. I loosened the nuts at the crossmember and shifted the transmission (and thus mount) further towards the rear. Keep it snug towards the rear and then snug up the bolts. If it feels unnatural when you start it up and move it through the RPM range (which is where I immediately noticed my issue) then you can try to loosen up those nuts again, start the jeep, work the RPM's a little, kill it, then see where the bolts are lined up in the holes on the crossmember. I knew mine needed to move to the back, but that should also get you to a place where the mounts are not in a bind, more of a natural "at rest" state, if that makes sense.
#16
The mount is bolted to both the transmission as well as the crossmember. I loosened the nuts at the crossmember and shifted the transmission (and thus mount) further towards the rear. Keep it snug towards the rear and then snug up the bolts. If it feels unnatural when you start it up and move it through the RPM range (which is where I immediately noticed my issue) then you can try to loosen up those nuts again, start the jeep, work the RPM's a little, kill it, then see where the bolts are lined up in the holes on the crossmember. I knew mine needed to move to the back, but that should also get you to a place where the mounts are not in a bind, more of a natural "at rest" state, if that makes sense.
Man, thanks again for all the help! What a relief!
#17
IT'S FIXED!!! I can't believe it. Now, after moving the trans and mount backward, it definitely does not look like the trans itself moved... But the vibration is gone and shifts feel normal again. If the trans itself didn't move, I wonder what could have moved that moving the trans back fixed it?! Also, I am going to run and rent a torque wrench just to be sure everything is snugged correctly. I am going to look, but if anyone knows the torque specs off the top of their heads, that would be awesome.
Man, thanks again for all the help! What a relief!
Man, thanks again for all the help! What a relief!
#18
I don't have any torque specs but the bolts are isolated in rubber so if you get too crazy, you'll tear the rubber. If I'm remembering right, they're 16 mm (may even be further up in the thread) but you get your 1/2" ratchet and just snug them down. You'll feel them get tight. Put a little oomph into it but certainly don't get your entire body weight behind it and pull.
#19
I don't have any torque specs but the bolts are isolated in rubber so if you get too crazy, you'll tear the rubber. If I'm remembering right, they're 16 mm (may even be further up in the thread) but you get your 1/2" ratchet and just snug them down. You'll feel them get tight. Put a little oomph into it but certainly don't get your entire body weight behind it and pull.
Wondering if I torqued too tight, and it's not allowing for any play? or if the mount needs to be preloaded a bit?
The mount was replaced about 1K ago by a dealership that noticed metal-to-metal on the old mount, so it's almost brand new. I did notice the below though, that the crossmember isn't exactly in the same place it was. Could that have an effect? It's like this on both sides.
Like I said - there doesn't seem to be any indication anymore of the mount rubbing, but honestly I can't fully tell.
#20
Mine weren't centered when I was "done". The mount was slid clear to the back and I had to move it clear to the front. I don't think over-torquing is going to be the issue, the rubber needs that torque to do the job.
Regarding your transfer case crossmember- I've taken to jacking it clear up and then tightening it down once it's there, I don't think it's possible to mess it up.
Regarding your transfer case crossmember- I've taken to jacking it clear up and then tightening it down once it's there, I don't think it's possible to mess it up.