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Unread 06-06-2011, 10:50 AM   #1
admyral
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2007 JK Engine noise - I'm baffled


Over the last month, my 36000 mile Jeep has developed this tick. It's corresponds to Valve Train RPM, so I naturally thought lifter or broken spring. Pulled the engine apart including taking off both heads (Boo! to the engineer that designed this engine, you have to take off the cyl heads to remove the lifters!), and saw NO damage, no shavings, no broken springs, no weird wear marks, nothing. I was so sure that it was a lifter issue, i went ahead and replaced them all. Put it all back together, started it up... tick-tick-tick-tick....

Suspecting maybe a valve, i put a vacuum gauge looking for a corresponding dip in pressure, but it's solid as a rock.

So my next thought was bearings, so i pulled the oil pan expecting to find some shredded bearings in the bottom, but nothing...

I pulled the intake down to the fuel rail, and swapped the injectors from one side to the other to see if the noise would move... no change.

If anyone has any ideas, please let me know.... Short of tearing down and rebuilding the entire engine, I am out of ideas.

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Unread 06-06-2011, 11:49 AM   #2
1222
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Could be piston slap. Are you 100% sure that itís your engine? If not, try removing the belt and start your engine to see if itís one of the accessories.
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Unread 06-06-2011, 11:59 AM   #3
ronjenx
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After you check what 1222 suggested....

It does sound like it is ticking at cam speed.
A blocked oil hole to a lifter would prevent even a new one from pumping up.

Can you run it with the valve covers off? You need to identify which cylinder/valve train the noise is coming from.
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Unread 06-06-2011, 12:26 PM   #4
admyral
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Quote:
Could be piston slap.
What the best method for testing this? I didnt see any grooves or scratches in the cylinder bores.

Quote:
Are you 100% sure that it’s your engine?
I didnt run without the belt, but i did put the stethescope on each accessory and didnt hear the tick. I will try this next (and feel REALLY stupid if it's true )

Quote:
A blocked oil hole to a lifter would prevent even a new one from pumping up.
All of the old lifters were full of oil, and none had any dry-bore scarring on them.

Quote:
Can you run it with the valve covers off?
Running without the valve covers is what i was going to try next... Unfortunately the engineeres at Trenton got me again, and made it so you have to remove the intake manifold to remove the VCs, and since the fuel comes in through there, you have to reassemble everything before running it, then take it all apart again to put the VC's back on .... By the end of this, i will certainly be an expert at tearing down and putting back together this engine.
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Unread 06-06-2011, 12:32 PM   #5
JIMBOX
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Man you might as well have overhauled the engine--

Sounds to me like a belt burr, or alternator brg/armature "tick", I'd put the steth0 on the idler pulley too

Good luck

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Unread 06-06-2011, 12:41 PM   #6
admyral
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Side note. Attached is a pic of how far you have to dig into the 3.8 to replace a lifter.
engine-without-heads.jpg  
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Unread 06-06-2011, 12:49 PM   #7
ronjenx
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I just went out and looked at mine. I can get a straight shot at all the valve cover bolts with the intake manifold in place. The coil pack must be moved, though.

My 4.0L straight six has to have the head removed to get the lifters out, too.
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Unread 06-06-2011, 12:54 PM   #8
JIMBOX
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I have a lifter removal tool that I used on my dodge 440/426-without removing the heads-

I guess (don't know) you haven't got enough room thru the pushrod hole ??

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Unread 06-10-2011, 10:30 AM   #9
admyral
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Well, just as an update, it's definately not any of the bolt-ons... it runs with the exact same noise with the belt removed.
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Unread 06-15-2011, 08:07 PM   #10
Mpaull
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JK Engine Noise

Did you check Timing Gear/Chain ? Just a thought. Glad My '08 JK came with the "lifetime" powertrain warrentee!! (Of course, getting it honored is another story)
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Unread 06-15-2011, 08:31 PM   #11
WXman
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My 2011 makes this exact same noise. It's not quite as loud as your video, but it's the exact same noise. I've sort of ignored it because I've got a laundry list of other issues and I'm under warranty so if it pops they can tow it and give me a loaner.
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Unread 06-16-2011, 07:03 AM   #12
tulsarob
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I too had a subtle "tick" noise. I went in for a dealer oil change, while the "expert" was filling out the info, while I was in line with the engine running, I said, "do you hear that ticking noise?"

He said yes, bent down a while to hear it a little better, then said it was the emmision control thingy on the whatcha macallit doomaflochy, and it was normal.

Those out of work Nasa rocket scientist make my head hurt
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Unread 06-16-2011, 07:20 AM   #13
tavic
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I have kind of a tick when she's cold, but goes away as soon as I push the clutch in and let it back out. I figure it was a syncro kind of thing, not to mention truck manual transmissions are a little on the noisy side anyhow.
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Unread 06-16-2011, 07:42 AM   #14
cidd
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It could be an exhaust leak somewhere on the manifold they make the same sound as a bad valve . There buggers to find. Try to get clear access to them and disconnect the fan then firer up the motor and use your hand to feel for hot air pulsing on it or use a piece of paper and watch for it to start jumping when you get to the leak make sure you check all the way down to the straight pipe under the jeep.
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Unread 06-16-2011, 08:06 AM   #15
paul84043
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PCV Valve? I've heard them tick before while opening and closing....
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