Jk 2012 3.6 strange loud front noise - JeepForum.com
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post #1 of 20 Old 03-04-2015, 07:25 AM Thread Starter
rallyman78
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Jk 2012 3.6 strange loud front noise

After a mud trail my JKU 2012 3.6 auto starts to have a strange noise in front of the engine.

Here it is how this sound look like: https://www.youtube.com/watch?v=IdTjgBln8nw

It sounds like a siren. Bystanders turn and stare. Aside from the noise there are no ill effects, but I can stand it no longer.

The noise does not seem to be coming from the steering pump -- it doesn't change with steering load and it seems to be coming from higher up, near the top of the Pentastar 3.6-liter V6. I don't think is the alternator too.

Anyone had the same issue?

Tks!
Felipe Schultz
JKU 2012 3.6 auto
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post #2 of 20 Old 03-04-2015, 07:36 AM
jwmbishop
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Pull the belt and check all of the pulleys by hand. Idler and tensioner especially
no loose, no crunchy or tight.

Check airbox for obstruction / wet air filter. Make sure temp sensor is well seated in air duct.

J Wm Bishop EA, ASADE
The wagon should, of course, be as light as possible, but strength should not be sacrificed to lightness, for on any but the regularly traveled roads, the wagon will get many a
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post #3 of 20 Old 03-04-2015, 10:49 AM Thread Starter
rallyman78
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tks jwmbishop! I will do that! does you already have the same problem? Does anyone have or had the same issue?

Last edited by rallyman78; 03-04-2015 at 11:11 AM.
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post #4 of 20 Old 03-04-2015, 11:24 AM
rubicon1000
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The issue is a pulley bearing they are not sealed and sand and grit gets in there and destroys them. I had the same issue on my 2012 when I lived in Florida had it changed under-warranty.

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post #5 of 20 Old 03-04-2015, 12:48 PM
JoeCitizen
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BTW, nice bumper.
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post #6 of 20 Old 03-04-2015, 01:20 PM
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Not on the JK - but the F250 started sounding like that and 125 miles later (while towing the JK) - the belt shredded and the idler pulley launched...

J Wm Bishop EA, ASADE
The wagon should, of course, be as light as possible, but strength should not be sacrificed to lightness, for on any but the regularly traveled roads, the wagon will get many a
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post #7 of 20 Old 03-05-2015, 07:09 AM
SlyDawg64
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Myself and a number of friends have had the same problem after dirty/dusty wheeling and found that the water pump bearing was going out. Took it to dealer who replaced it under warranty with no problem.

New:
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post #8 of 20 Old 03-05-2015, 07:21 AM Thread Starter
rallyman78
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Quote:
Originally Posted by SlyDawg64
Myself and a number of friends have had the same problem after dirty/dusty wheeling and found that the water pump bearing was going out. Took it to dealer who replaced it under warranty with no problem.
Did they change only the bearing or the water pump?
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post #9 of 20 Old 03-05-2015, 07:26 AM Thread Starter
rallyman78
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Quote:
Originally Posted by rubicon1000
The issue is a pulley bearing they are not sealed and sand and grit gets in there and destroys them. I had the same issue on my 2012 when I lived in Florida had it changed under-warranty.
Do you know which pulley can be?
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post #10 of 20 Old 03-05-2015, 07:41 PM Thread Starter
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Went to mechanics shop today and listen With stetoscope to the idler pulley, and we think os one of it. Just order the pulley
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post #11 of 20 Old 03-05-2015, 07:52 PM
rich6700
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There are two idler pulleys, replace them both
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post #12 of 20 Old 03-06-2015, 10:50 AM
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I replaced the three pulleys and the alternator bearing and the noise continued. It was the water pump where the noise was coming from. Replaced yesterday with 49000Km. Looks fine now.

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post #13 of 20 Old 03-06-2015, 10:54 AM
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Quote:
Originally Posted by rallyman78 View Post
Went to mechanics shop today and listen With stetoscope to the idler pulley, and we think os one of it. Just order the pulley
Just in case. The Jeep 2012 on pulleys are the same of the Citroen Picasso 2.0. See part number VKM4913. They are much cheaper comparing to the ones provided by Mopar in Brazil.

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post #14 of 20 Old 03-06-2015, 10:56 AM
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Quote:
Originally Posted by SlyDawg64 View Post
Myself and a number of friends have had the same problem after dirty/dusty wheeling and found that the water pump bearing was going out. Took it to dealer who replaced it under warranty with no problem.
There is no bearing on the water pump. It is a quality issue not solved yet by the factory.

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post #15 of 20 Old 03-06-2015, 11:19 AM
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Quote:
Originally Posted by rich6700 View Post
There are two idler pulleys, replace them both
DITTO!!! But again - with the belt off you can usually FEEL the bad one...

Quote:
Originally Posted by Paio2012 View Post
Just in case. The Jeep 2012 on pulleys are the same of the Citroen Picasso 2.0. See part number VKM4913. They are much cheaper comparing to the ones provided by Mopar in Brazil.
Thanks - I love interchange info!

Quote:
Originally Posted by Paio2012 View Post
There is no bearing on the water pump. It is a quality issue not solved yet by the factory.
no SERVICEABLE bearings....

J Wm Bishop EA, ASADE
The wagon should, of course, be as light as possible, but strength should not be sacrificed to lightness, for on any but the regularly traveled roads, the wagon will get many a
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alternator , idler pulley , noise , serpentine belt , water pump

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