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Unread 02-13-2014, 04:51 PM   #1
lfhoward
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2008 KK Liberty 
 
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Noisy Engine... Thoughts?

Hi Jeepers,
My 3.7 has been noisy since the day I got it, when it had 23K on the clock. I just passed 83K yesterday, and nothing much has changed. I thought I'd see how many other 3.7 owners have this noise, and whether it ever caused a problem.

The noise can be heard at idle, sort of a clicking. But no biggie.

There is no significant engine noise in the cabin during normal driving or acceleration when the engine is under load, like when getting up to highway speeds or maintaining speed on the flat or climbing hills.

Here is where I notice it: There is a clattering or tapping sound from the engine when it is at high RPM's and coasting, when not under heavy load. This happens at the top of gears just before upshift, like when you are cresting a hill in 3rd, just before it shifts into 4th. It happens when coasting down long hills on the interstate in 4th, or when descending steep hills in a low gear (at high RPM's). It happens when in tow/haul mode on the highway when there isn't a heavy load in tow. (I use tow/haul on 45-50 mph roads with undulating hills to keep the transmission from shifting between 2-3-4 all the time. Tow/haul keeps it in 3rd.)

What I've found is that RPM's usually have to be over 2500 for this to happen, when there isn't a heavy load on the engine. The tapping or clattering or hammering sound corresponds to the turning of the engine/cylinders. It sounds like metal banging on metal. I have had my oil tested by Blackstone Labs and there aren't any extra metal deposits in it, and I haven't noticed any change in performance or an increase in noise over the last 60K miles. 1 qt of Lucas Oil plus 4 quarts of regular oil makes it a little quieter. I was on a long trip through the PA mountains yesterday and noticed it a lot.

Thoughts? Thanks in advance!
--LFH

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Unread 02-13-2014, 05:44 PM   #2
RENE65
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bought mine with 40,000 kms ,now at 77,000 kms ,engine was Noisy then,its still Noisy now I think they are just built loose but you dont hear of engine faillure on the 08-12 libbys
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Unread 02-14-2014, 10:04 PM   #3
Drednot
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Next oil change, try using shell rotella-T diesel oil. It seems to have an extra effective additive package that tends to dissolve deposits that restrict oil passages. This allows lash adjusters to do a better job of quieting the valve train.
I had good luck with this very issue on my Isuzu trooper and its showing results in my old cj that ticks like a time bomb.
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Unread 04-22-2014, 04:12 AM   #4
xxxxxxxxxxxxSmetna
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Quote:
Originally Posted by RENE65
. . . but you dont hear of engine faillure on the 08-12 libbys
(Knock on wood). Ouch
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Unread 04-22-2014, 08:00 AM   #5
lfhoward
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Interesting that you found my old thread. It turns out that must have been rod knock. It held out for 63,000 miles like this before becoming a problem, but then a rod bearing disintegrated on Saturday. Engine swap in progress...
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Unread 04-22-2014, 01:19 PM   #6
JeepLibertyKK
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I can easily say that mine's pretty noisy; you really hear it like when pulling up to the drive-thru window, as the engine noise reverberates from the wall. Noisy at a normal idle sitting in the driveway too... in fact, I've been wondering if something might be wrong but based on some of the replies here, probably nothing wrong.

Years ago I had a Jeep Cherokee and remember reading a automotive review that stated that the 4.0 engine had an 'agriculture' sound to it, like a tractor. Guess the 3.7 follows with the same hereditary.
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Unread 04-22-2014, 01:31 PM   #7
rescue575
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Mine has had that "ticking" sounds since I bought it new. Had the same sound on my '07 Grand Cherokee. Most likely normal.

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Unread 04-22-2014, 04:38 PM   #8
lfhoward
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Here's the LostJeeps version of this thread. A few other responses on there to look at. http://www.lostjeeps.com/forum/phpBB...p?f=88&t=78287

I think my particular engine was an oddball. The 3.7 is a noisy engine, but fairly reliable. I haven't heard of this happening to anybody else that I can remember, and that includes all the KJ folks with the same engine going back to 2002.
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Unread 04-22-2014, 05:04 PM   #9
rescue575
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Quote:
Originally Posted by lfhoward
Here's the LostJeeps version of this thread. A few other responses on there to look at. http://www.lostjeeps.com/forum/phpBB...p?f=88&t=78287 I think my particular engine was an oddball. The 3.7 is a noisy engine, but fairly reliable. I haven't heard of this happening to anybody else that I can remember, and that includes all the KJ folks with the same engine going back to 2002.
Deff agree with you Howard. In fact my buddy is a service manager at a jeep dealership and when I had my truck in for service, I was BSing with the mechanic and he was telling me that the KK is one of the least vehicles in the shop for problems compared to the rest of the line.

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Unread 04-23-2014, 02:45 PM   #10
xxxxxxxxxxxxSmetna
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Quote:
Originally Posted by JeepLibertyKK
I can easily say that mine's pretty noisy; you really hear it like when pulling up to the drive-thru window, as the engine noise reverberates from the wall. Noisy at a normal idle sitting in the driveway too... .
Totally normal. Nature of the beast.
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