Harmonic Balancer (crank pulley) slight wobble - JeepForum.com

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post #1 of 22 Old 09-29-2012, 11:49 AM Thread Starter
calvin196
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Harmonic Balancer (crank pulley) slight wobble

Is a slight wobble normal with the 4.0 balancer?

01 jeep xj sport
amc242 4.0 i6

The balancer had a wobble befroe and some corrosion on it so I changed it, and yet still a wobble and its been that way for a while, what's the possible cause or causes?

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post #2 of 22 Old 09-29-2012, 02:16 PM
BassMasterCHS
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Changed it with new one? There shouldn't be any movement at all.

3 Inch lift, 30" BFG AT's, Walmart lights up front.
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post #3 of 22 Old 09-29-2012, 02:19 PM
wgirvine
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No, it shouldn't wobble at all. You say you changed it... with what? New part or junkyard?

The road goes on forever, the party never ends....
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post #4 of 22 Old 09-30-2012, 09:13 AM Thread Starter
calvin196
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Quote:
Originally Posted by wgirvine View Post
No, it shouldn't wobble at all. You say you changed it... with what? New part or junkyard?
I replaced it with a brand new ATP harmonic balancer, stock specs everything. BRAND NEW :P

I installed it properly also replaced woodruff key with brand new one. It's a slight back/forth wobble almost some could consider it a "shake" maybe? Here is a video that resembles what my jeep is doing.

Do keep in mind this isn't my actual video, it just resembles what my harmonic balancer is doing precisely. I see he says he changed his balancer but I've done the same, torqued to spec everything, used puller / presser and the jeep runs great and has no noticeable performance loss at all.

http://www.youtube.com/watch?v=pIy7gF-4Z2o

Last edited by calvin196; 09-30-2012 at 09:50 AM.
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post #5 of 22 Old 09-30-2012, 09:39 AM
GetLifted
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Is it kicking off your serpentine belt? Does it wobble in and out or up and down?
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post #6 of 22 Old 09-30-2012, 09:49 AM Thread Starter
calvin196
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Quote:
Originally Posted by GetLifted View Post
Is it kicking off your serpentine belt? Does it wobble in and out or up and down?
My serpentine belt is fine, ac engaged etc.. everything is fine, it doesn't seem to actually "move" and I just went outside and recorded this to show you exactly what my pulley is doing,

http://www.youtube.com/watch?v=-O1PWAtKMYY
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post #7 of 22 Old 09-30-2012, 10:37 AM
GetLifted
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Well about 4 seconds of that video were on the harmonic balancer, and it didnt appear to wobble to me?

Maybe try a minute vid with it fixed on the HB. And throw some serious revs.

If its wobbling in and out of the block, you got crankwalk and your block may need to be replaced. If its off balance (up and down) you may have a bad replacement, bent crank, or severely worn main bearings.


To me: it looked and sounded ok. 4.0s are noisy.
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post #8 of 22 Old 09-30-2012, 11:05 AM Thread Starter
calvin196
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Quote:
Originally Posted by GetLifted View Post
Well about 4 seconds of that video were on the harmonic balancer, and it didnt appear to wobble to me?

Maybe try a minute vid with it fixed on the HB. And throw some serious revs.

If its wobbling in and out of the block, you got crankwalk and your block may need to be replaced. If its off balance (up and down) you may have a bad replacement, bent crank, or severely worn main bearings.


To me: it looked and sounded ok. 4.0s are noisy.

Ok, yea its just a very slight wobble, if you look at the belt where it leads to the HB yuo can see a wobble in the belt, its like a back/forth but not in / out wobble or up / down its hard to explain, It's a fixed wobble if that makes any sense, I don't see the crank actually moving in any way.
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post #9 of 22 Old 09-30-2012, 11:10 AM
GetLifted
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If u can, Make another vid of it fixed on the balancer and rev it up.
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post #10 of 22 Old 09-30-2012, 12:20 PM Thread Starter
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Quote:
Originally Posted by GetLifted View Post
If u can, Make another vid of it fixed on the balancer and rev it up.
I think the slight movement is normal? I found a video of a newly rebuilt amc 242 and there is the same "wobble" on his harmonic balancer as well.

http://www.youtube.com/watch?v=I4kZfPmw2lw

that's the video in reference.
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post #11 of 22 Old 09-30-2012, 01:58 PM
GetLifted
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i didnt see a wobble in that one either? That vid sounded like a misfire.

Gotta see a video of the HB where the camera is fixed. Moving it around and around makes it impossible to see from my POV.
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post #12 of 22 Old 09-30-2012, 04:55 PM
AZ Jeff
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I did not see any noticeabe wobble from the HB, but the camera kept moving about too much to study it well.

Where is your FAN SHROUD? That a is major help to pulling air through the mechanical fan!!

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I don't own an XJ any longer, but I still think they are the best of all the Jeep products ever made. My XJ was my favorite vehicle in my 50+ years of driving.
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post #13 of 22 Old 10-01-2012, 02:00 AM Thread Starter
calvin196
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Quote:
Originally Posted by AZ Jeff View Post
I did not see any noticeabe wobble from the HB, but the camera kept moving about too much to study it well.

Where is your FAN SHROUD? That a is major help to pulling air through the mechanical fan!!
The genius that helped me get my hood up snapped it off and said "oops"... Haven't felt the need to get a new one as my electrical fan is non-existent due to that also being improperly re-installed after the radiator was replaced.

Also I do know its hard to study it, but I was trying to get many different angles not knowing which would have been best, also I'm using a hand-held camera nothing fancy and I don't have a camera stand or anything so its hard to get a steady shot of the harmonic balancer. If you really look you can see the slight wobble in the belt as well as the Harmonic Balancer when carefully watching. I am very picky but it is quite a bad wobble to the bare eye, the camera doesn't really do much justice even at 60 fps.
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post #14 of 22 Old 10-01-2012, 08:54 AM
GetLifted
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you have no fan shroud and no efan


And i went and looked at mine. Its got a very slight wobble, seems to be normal.
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post #15 of 22 Old 10-01-2012, 10:02 AM
wgirvine
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I got seasick watching that video; keep the camera steady next time. And yes, replace the shroud and get the E-fan working. Unless you want the engine to overheat...

The road goes on forever, the party never ends....
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