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Unread 08-27-2011, 11:10 AM   #1891
Rubi4MyMrs
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Quote:
Originally Posted by Bigbob View Post
I'm just a tap dancing monkey with a cowboy hat on but, I figure the bushing is a oilite type that has some porosity and once the shaft and bushing warms up the waxy crap soaks into the bushing.
If only! My magnet tells me the bushing is not. I’d bet that if the bushing was oilite we would never hear the laughing monkey.

Speaking of monkeys, I’ve never seen one in a cowboy hat driving a jeep. If I get up in the Bakersfield area, I'll be looking for you!

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Unread 08-29-2011, 11:08 AM   #1892
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So im sure this might have been covered but by page 14 I decided to just ask - I'm getting a knocking sound that I think is coming from this problem. Has anybody had that? I don't get any squeeking or anything, just a knocking sound and its fairly faint but still somewhat noticable. I have not pulled it yet but I started and one of the bolts that holds the cap down broke off a half circle piece of metal that is screws into on the actual housing so I gotta get a new one anyway.
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Unread 08-29-2011, 12:03 PM   #1893
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Maybe it's just me, but I wouldn't let that stop me. See what shape the OPDA is in. The way the cap fits on, I'm sure one bolt will hold it just fine. It has been discussed briefly before but it is good practice that any bolts going into aluminum have anti-seize on the threads. A small tube at the local parts store is not expensive & lasts forever.
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Unread 08-29-2011, 06:26 PM   #1894
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Just grasping at straws, but I thought I'd throw this out. Just for giggles I took a look at the gear on my son's 2000 Sahara yesterday. I't looked fine with even wear. The noticable thing was that the hold down bolt broke loose very easily, with the same wrench I use for the 2005. The first time I removed the bolt on the 2005 it took quite an effort to break it loose.This is a long reach Snap- On wrench. I don't know what the torque value is,but the 2000 was probably not over 10-12 lb.ft.
Could the OPDA's on our Jeeps have been tightened so much as to actually bind the shaft?
Also the 2000 has 143,000 miles and unless someone snuck into my driveway in the last 11 years and loosened the bolt it has never been off.
Like I stated,just an observation not enough info to start a debate.
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Unread 08-29-2011, 06:44 PM   #1895
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Slugger, are you talking about the bolt that holds the OPDA in place? Seems highly unlikely to me, but maybe (Willy will chime in). I haven't posted in this thread since it first started. It's funny to think that more R&D on this part has been done via this thread, by JF members, than Chrysler ever did.
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Unread 08-29-2011, 07:03 PM   #1896
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Quote:
Originally Posted by NextJeep View Post
Slugger, are you talking about the bolt that holds the OPDA in place? Seems highly unlikely to me, but maybe (Willy will chime in). I haven't posted in this thread since it first started. It's funny to think that more R&D on this part has been done via this thread, by JF members, than Chrysler ever did.
Yea , the hold down bolt. I agree it is unlikely, actually was hesitant to even post , but at this point any avenue to explore to find a solution.
My real thought was that it would help explain why some have trouble at such varied mileage and that some never do. Maybe different folks doing the assembly, some tightening it more than others. I can't see much Quality Control going on anywhere else so this probably isn't any different.

Hopefully Willy will chime in as I believe he has worked on several OPDA's removal and re-installing.
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Unread 08-29-2011, 07:14 PM   #1897
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Quote:
Originally Posted by Slugger

Yea , the hold down bolt. I agree it is unlikely, actually was hesitant to even post , but at this point any avenue to explore to find a solution.
My real thought was that it would help explain why some have trouble at such varied mileage and that some never do. Maybe different folks doing the assembly, some tightening it more than others. I can't see much Quality Control going on anywhere else so this probably isn't any different.

Hopefully Willy will chime in as I believe he has worked on several OPDA's removal and re-installing.
While I certainly encourage the brainstorming, I doubt that over tightening the hold-down could be the culprit; if it were uneven tightening as described, the entire housing would be arched, causing the shaft to wear excessively but evenly at the apex of the arch.
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Unread 08-29-2011, 07:20 PM   #1898
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Quote:
Originally Posted by Slugger

Yea , the hold down bolt. I agree it is unlikely, actually was hesitant to even post , but at this point any avenue to explore to find a solution.
My real thought was that it would help explain why some have trouble at such varied mileage and that some never do. Maybe different folks doing the assembly, some tightening it more than others. I can't see much Quality Control going on anywhere else so this probably isn't any different.

Hopefully Willy will chime in as I believe he has worked on several OPDA's removal and re-installing.
While I certainly encourage the brainstorming, I doubt that over tightening the hold-down could be the culprit; if it were uneven tightening as described, the entire housing would be arched, causing the shaft to wear excessively but evenly at the apex of the arch and my shafts (again, I'm looking at three units) all have uneven wear. I'm not convinced about the seal inversion hypothesis I proposed, but I'm more inclined to buy the misalignment idea than over tightening. I'll post more pics of the shafts in the morning.
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Unread 08-29-2011, 07:49 PM   #1899
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Maybe they just used a wooden dowel or similar to align the bushings

Maybe they had a bad run of aluminum, they forged a bunch of bad housings that were just slightly misaligned and decided to use them anyways. This might explain why some fail at 16,000 and some still have not failed at 100,000.
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Unread 08-29-2011, 08:18 PM   #1900
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Quote:
Originally Posted by flying_bosun View Post
While I certainly encourage the brainstorming, I doubt that over tightening the hold-down could be the culprit; if it were uneven tightening as described, the entire housing would be arched, causing the shaft to wear excessively but evenly at the apex of the arch and my shafts (again, I'm looking at three units) all have uneven wear. I'm not convinced about the seal inversion hypothesis I proposed, but I'm more inclined to buy the misalignment idea than over tightening. I'll post more pics of the shafts in the morning.
I wouldn't even go so far as calling my thoughts pondering, much less brainstorming. I guess I'm looking at variables in the failure times of our units as the solution to the problem.Although the design seems to have so many problems from lack of lubrication to the size of the wheel the fact that failures are occurring as early as 8k miles while others have over 100k miles with no problems seem to point to assembly variables more than machining.
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Unread 08-29-2011, 08:33 PM   #1901
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Quote:
Originally Posted by Brainwashed2566 View Post
Maybe they just used a wooden dowel or similar to align the bushings

Maybe they had a bad run of aluminum, they forged a bunch of bad housings that were just slightly misaligned and decided to use them anyways. This might explain why some fail at 16,000 and some still have not failed at 100,000.
This could be possible,but in this thread people with engine build dates from late in the year in 04' to the last to roll off the line in summer of 06' have had problems. I also have not heard of anyone other than LDI making these things. Maybe they could have been running housings, shafts, bushings on different machines,but after looking at their website months ago they seem to know how to machine parts.
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Unread 08-29-2011, 09:04 PM   #1902
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Quote:
Originally Posted by flying_bosun View Post
While I certainly encourage the brainstorming, I doubt that over tightening the hold-down could be the culprit; if it were uneven tightening as described, the entire housing would be arched, causing the shaft to wear excessively but evenly at the apex of the arch and my shafts (again, I'm looking at three units) all have uneven wear. I'm not convinced about the seal inversion hypothesis I proposed, but I'm more inclined to buy the misalignment idea than over tightening. I'll post more pics of the shafts in the morning.
If you post more photos give us some of the cutaway showing the lower bushing area as well as letting us know if there was any evidence of oil getting into the area above the lower bushing & if so, how far up. Thanks.
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Unread 08-29-2011, 09:15 PM   #1903
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I honestly don't think over-tightening could be the problem Slugger. All the hold down bolt does is to clamp the housing against the block, so once the housing is against the block, it won't give any more. Any excessive tightening of the bolt at that point would only affect the clamp, to the point it might bend or the bolt snap off.
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Unread 08-30-2011, 07:11 AM   #1904
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Can't say the overtightening idea didn't cross my mind. Then it went to machining of the OPDA mating surface and position relative to the block. While I've done several FogMod's, I've only installed (not including mine) three. One was so tight I needed a 6-point. The other two were manageable. I saw no difference in OPDA quality and like mentioned earlier, overtightening would impact the retention clamp once the housing seats.

Being no expert I have to think the difference in failure and wear points is a combination of drive style (higher RPMs), low ZDDP oil during break-in (at the least), low oil level, and binding. I don't think binding would start that early in mileage though. I know from experience that heat and the potential for binding starts are 50K. I've seen OPDA shafts at that mileage. Not long after 60K my laughing monkey started.
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Unread 08-30-2011, 11:08 AM   #1905
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Would a knocking sound be a symptom of this issue? I'm about 90% sure its coming from my opda just b/c and put my hand on the cap and felt the vibrations but since im not a mechanic i accept the fact i could be wrong
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