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View Full Version : Weird rattle from starter/transmission area


Intellect
November 10th, 2017, 13:01
1995 4.0 xj 4wd. It has this weird rattle sound. I thought maybe it was the exhaust, but negative. It sounds like its coming from the transmission/maybe starter area.

Fixing to drive this thing 400 miles round trip. I have all day today to figure this out.

It doesnt sound internal motor wise, it does not go with the rpm or rod pattern.

If the jeeps sitting itll start to ratlle, stop, start to, it SOUNDS like when an exhaust has a rattle, but its NOT the exhaust... Heres a video. Ill be forever grateful to whoever can help


https://youtu.be/3ze5arrv0f4

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lawsoncl
November 10th, 2017, 15:23
If it sounds like it's in the transmission bellhousing, remove the thin metal inspection plate from the front lower portion and check that the flexplate bolts have not backed out. Also look up with a flashlight and make sure the flexplate is not cracked.

RCP Phx
November 10th, 2017, 17:23
Stay home this weekend!

Runnin'OnEmpty
November 10th, 2017, 20:35
My 96 has a rattle like that. I too thought it was an exhaust rattle, because that's exactly what it sounds like. After crawling under it with the engine idleing, the noise is coming from the catalytic converter. The stock ones have a history of the insides breaking loose and rattling. I'll eventually replace the cat, but for now I'm just driving it. Doubt if it causes any harm...

the_weirdo
November 10th, 2017, 21:13
My 96 has a rattle like that. I too thought it was an exhaust rattle, because that's exactly what it sounds like. After crawling under it with the engine idleing, the noise is coming from the catalytic converter. The stock ones have a history of the insides breaking loose and rattling. I'll eventually replace the cat, but for now I'm just driving it. Doubt if it causes any harm...

Agree with the above - just hit the catalytic converter with a soft mallet (or your fist) and listen for a rattle.

Intellect
November 10th, 2017, 21:49
Agree with the above - just hit the catalytic converter with a soft mallet (or your fist) and listen for a rattle.I do not have a cat. I deleted the cat. I only have a flowmaster muffler and stock pipe besides where i deleted the cat.


It is def from the engine/tranny area. Thank you though.

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Intellect
November 10th, 2017, 21:50
If it sounds like it's in the transmission bellhousing, remove the thin metal inspection plate from the front lower portion and check that the flexplate bolts have not backed out. Also look up with a flashlight and make sure the flexplate is not cracked.Ill check this in the morning

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Intellect
November 10th, 2017, 21:53
If it sounds like it's in the transmission bellhousing, remove the thin metal inspection plate from the front lower portion and check that the flexplate bolts have not backed out. Also look up with a flashlight and make sure the flexplate is not cracked.You are a life saver, i watched a few videos online and seems like identical sound. Can i tighten them threw the peak through you described? Or is it a remove the tranny type of job.... If its a remove the tranny job, think ill be ok for the weekend driving like this?

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Anak
November 10th, 2017, 22:33
It would not be something to drive with.

The panel you would remove to access them would be the way to deal with them. That is how you would deal with them if you were removing either the engine or transmission.

You will probably only be able to access one bolt at a time. You will need to bump the starter to move the flexplate a bit at a time so that you can access them all, one at a time.

Intellect
November 10th, 2017, 23:32
If it sounds like it's in the transmission bellhousing, remove the thin metal inspection plate from the front lower portion and check that the flexplate bolts have not backed out. Also look up with a flashlight and make sure the flexplate is not cracked. 3 or 4 of the flexplate bolts took 1/4th of a turn, solved the rattle! Thank you so much! This has been a bad week for my Jeep and i was so ready to sell it, (angry talk, id never sell it lol), or to slap a new motor in. I had people telling me it was piston slap. But nope, tightened those bolts and it idled without a rattle, drove without one, im sure i should torque them or locktite them, but this was a fix to get me to my event tomorrow at 6am!

Now to chase that fuel issue another day..

But you know what, going from thinking you have to swap a motor, to having to prime it a lot to start it, makes it seem like a lot smaller issue. Thank you so much! I had just laid down to rest for my 6am event and was going to roadkill it hoping the motor didnt blow or tranny didnt give, and i checked your forum right before i closed my eyes, i threw on the ol grease hat and an hour later im in the best mood all week! THANK YOU. I should have researched this one more, i usually am more elaborate with my efforts and should not have written it off as piston slap so quickly. Excuse my lazyness there. But THANK YOU sir. Good day.

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Intellect
November 10th, 2017, 23:35
It would not be something to drive with.

The panel you would remove to access them would be the way to deal with them. That is how you would deal with them if you were removing either the engine or transmission.

You will probably only be able to access one bolt at a time. You will need to bump the starter to move the flexplate a bit at a time so that you can access them all, one at a time.Flex plate bolts needed 1/4th turn, no boxed end style torque wrench, so used all my might than used the old wrench on a wrench leverage for that extra umf of a turn lol, not the most accurate method, but stopped the rattle for now... Now to chase that fuel issue another day. Which seems like a lot less of a nuisance after thinking my motor was toast. But nope, healthy motor (besides my little diesel the cherokees are infamous for) (slight lifter chatter)

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Intellect
November 10th, 2017, 23:36
For anyone who comes across this, the slightest bit makes a big difference i learned tonight. My flexplate bolts took 1/4th turn is it. But if you look, you see prior to my tightening, the right of the bolt head is more shiney on the flexplate, hard to describe, bur you can see the head was moving back and forth. Glad i caught it before i wollowed a hole... Or an oval per say. https://uploads.tapatalk-cdn.com/20171111/442948e2cd97ef9ba68f331fa4ffe759.jpg

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lawsoncl
November 11th, 2017, 00:16
3 or 4 of the flexplate bolts took 1/4th of a turn, solved the rattle!

Cool, glad to help. Enjoy the road trip!

Intellect
November 11th, 2017, 10:45
Cool, glad to help. Enjoy the road trip!😀

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cruiser54
November 12th, 2017, 05:53
If this happens, you should remove them one by one and reinstall the bolts with Loctite.

They will likely loosen up again at some point otherwise.

Intellect
November 12th, 2017, 05:56
If this happens, you should remove them one by one and reinstall the bolts with Loctite.

They will likely loosen up again at some point otherwise.I plan to. It was 1am and i had an event to go to the following day

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cruiser54
November 12th, 2017, 05:58
Gotcha. Just making sure folks are aware of that. Have a safe trip.

Intellect
November 12th, 2017, 06:38
Gotcha. Just making sure folks are aware of that. Have a safe trip.Thank you, i hear the bolts are a pain to get out. True or not too bad?

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cruiser54
November 12th, 2017, 06:43
Thank you, i hear the bolts are a pain to get out. True or not too bad?

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Easy. One at a time.

blakews2217
November 12th, 2017, 18:13
Iíve had them back out so far as to sound like a rod knocking away. I pulled the cover and they were out 2 turns. Locktight and plenty of torque and havenít had an issue


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Runnin'OnEmpty
November 14th, 2017, 20:33
As this topic progresses, I'm uncertain about my cat rattle diagnosis, and think it might indeed be loose converter bolts.

I've ordered a set of the updated bolts, just in case. Looks like they have a broader head for more clamping area...?

cruiser54
November 15th, 2017, 04:50
I really think it was an issue with the LocTite they used and/or the torque spec.

Johnnie Walker
November 16th, 2017, 00:05
As this topic progresses, I'm uncertain about my cat rattle diagnosis, and think it might indeed be loose converter bolts.

I've ordered a set of the updated bolts, just in case. Looks like they have a broader head for more clamping area...?If you tap hard enough or pound on the cat (that's what she said), and it makes noise then that helps narrow that down.

greenlawnjeeper
November 17th, 2017, 10:42
Glad its fixed. My rattle under there was the 4wd linkage which was cured with alot of spray lithium grease.