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-   -   Loud thud after shut off/turn on (http://www.wranglerforum.com/f210/loud-thud-after-shut-off-turn-on-252426.html)

jherrington 06-28-2013 09:24 PM

Loud thud after shut off/turn on
 
For the past few days, when cutting the engine off, I get a loud thud from beneath me. As if someone took a rubber mallet and hit my transmission.

This isn't EVERY time, but 90% of the time. I cannot replicate the thud if I just crank it up and cut it off. I have to have driven somewhere.

Now, for the thud on turn on, it's the same thud and then engine almost hiccups

It's a stick shift. It doesn't sound like its coming from the engine. So, clutch? Flywheel?

Cape Fear Finn 06-28-2013 11:21 PM

Worn transmission mount?

jherrington 06-29-2013 05:34 AM

Quote:

Originally Posted by Cape Fear Finn (Post 3910194)
Worn transmission mount?

Now that's something I hadn't thought of. Il have to check that out today.

jherrington 06-29-2013 06:27 AM

Update: now getting vibrations when getting to about 2k rpm. I'm talking mad vibrations. Not violent, but high frequency.

jherrington 07-02-2013 09:00 AM

NOT the transmission mount. It is still in place and intact.

What now?

tbensor 07-02-2013 09:04 AM

motor mounts good?

jherrington 07-02-2013 02:08 PM

Quote:

Originally Posted by tbensor (Post 3919941)
motor mounts good?

How would I know?

jherrington 07-02-2013 06:36 PM

Jeep wrangler klunk upon shut down - YouTube

Cape Fear Finn 07-02-2013 06:50 PM

Does it sound any different if you turn it off with the clutch in or with the clutch out in neutral?

JimsJeep 07-02-2013 07:12 PM

Quote:

Originally Posted by jherrington (Post 3919927)
NOT the transmission mount. It is still in place and intact.

What now?

Don't assume because it looks to be in one piece that it is.

jherrington 07-02-2013 07:26 PM

Quote:

Originally Posted by Cape Fear Finn (Post 3921651)
Does it sound any different if you turn it off with the clutch in or with the clutch out in neutral?

I haven't really tested this back to back to see if there is a difference, but it still pops no matter if clutch is in or out.

jherrington 07-02-2013 07:27 PM

Quote:

Originally Posted by JimsJeep (Post 3921737)
Don't assume because it looks to be in one piece that it is.

I removed the skit plate and inspected/grabbed/shook it from the bolts. still intact and in one piece.

jherrington 07-02-2013 07:33 PM

It doesn't sound bad in the video, but believe me. its a scary sound.

Engine seems to stop a little quicker. I also get a nice pop upon start up.

JimsJeep 07-02-2013 07:52 PM

Quote:

Originally Posted by jherrington (Post 3921790)
I removed the skit plate and inspected/grabbed/shook it from the bolts. still intact and in one piece.

Is the rubber bushing ok where the exhaust mounts to the trans offset plate.

jherrington 07-02-2013 07:57 PM

the bushing is there. Dad must have replaced a piece of exhaust piping because ive never seen the exhaust mounted there.

Again, you can feel the bump. not just hear it.

jherrington 07-02-2013 09:15 PM

I think I'm just going to take it to my mechanic. He changed out the clutch last year, so if its one of those parts, it should be under warranty and all I have to do is pay labor.

Unless someone convinces me to not spend upwards of $600 to get whatever it is fixed.

tbensor 07-03-2013 11:26 AM

are the bolts on the starter tight?

jherrington 07-03-2013 02:40 PM

Still get rattle with clutch in.


Clutch isn't spinning. Transmission isn't spinning. The only thing in there that's moving is the flywheel. If its not that, I'm a seriously confused person then.

tbensor 07-03-2013 02:44 PM

starter engages fly wheel. If starter is remaining in contact that could still be it.

jherrington 07-03-2013 02:50 PM

Quote:

Originally Posted by tbensor (Post 3924518)
starter engages fly wheel. If starter is remaining in contact that could still be it.

So, take the starter off and see if I see anything abnormal on the flywheel?

JimsJeep 07-03-2013 03:31 PM

What about a bad pilot bearing ? Just thinking maybe.

jherrington 07-03-2013 03:44 PM

I may be an idiot. When I took my skid plate off, I noticed some rubbing on my cat. Didn't think anything of it. Now I think my exhaust has been hitting my skid plate. Il check that out when the pipes cool off. *facepalm*

JimsJeep 07-03-2013 04:04 PM

Quote:

Originally Posted by jherrington (Post 3924668)
I may be an idiot. When I took my skid plate off, I noticed some rubbing on my cat. Didn't think anything of it. Now I think my exhaust has been hitting my skid plate. Il check that out when the pipes cool off. *facepalm*

That's why I mentioned the exhaust bushing/bracket yesterday. There should be a 1/2" offset rod welded to the exhaust pipe that slides into the rubber bushing on the trans mount offset plate. If that whole assembly is missing then it could very easily bang up against the skid plate. I hope you found the problem.

jherrington 07-03-2013 04:18 PM

That was it. I took your post into consideration too. Thanks!

I know dad had the exhaust manifold replaced years and years ago.. I'm guessing they replaced that portion of the exhaust too.

Now that the wild goose hunt is over with.. *whistling*

Cape Fear Finn 07-03-2013 04:30 PM

And I lost sleep over this?! :)

jherrington 07-03-2013 09:08 PM

Quote:

Originally Posted by Cape Fear Finn (Post 3924808)
And I lost sleep over this?! :)

I know I did! Lol

Back to changing the differential and transmission oils I go.

tbensor 07-08-2013 03:41 PM

nice find ;)


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