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Old 02-24-2013, 06:20 PM   #31
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From what I gathered on the JF thread, putting an worn OPDA can start needless wear on your cam too, it's one of those do-both-at-the-same-time things.

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Old 02-25-2013, 12:38 AM   #32
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My opda is new, and even though the wear on my cam was prolly very very slight i do know it should be replaced, but im sure the new gears on my dorman will hold up for a good amount of time and i do believe it is lifetime warranty!

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Old 03-09-2013, 06:39 PM   #33
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Excessive wear?

So I pulled it. Wear on the OPDA and camshaft is about the same. Will eventually get the Dorman, but like so many other people I'm waiting for some folks to put the miles on first.

What do you think? Does this look like serious wear to you?
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Old 03-09-2013, 09:15 PM   #34
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Quote:
Originally Posted by Stankgearoil View Post
So I pulled it. Wear on the OPDA and camshaft is about the same. Will eventually get the Dorman, but like so many other people I'm waiting for some folks to put the miles on first.

What do you think? Does this look like serious wear to you?
That's actually not too bad... Mine looked like this:
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Old 04-07-2013, 10:20 PM   #35
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I just replaced mine, looked very good almost like Stankgearoil's (sorry no pic yet) and mine has 95000 miles. Already had ordered the Dorman so replaced it rotated the crank so the holes lined up and dropped in the allen wrench and stuck in the Dorman, it sits at about a 5oclock now. Started it up and runs good but the P0016 came on, so in order to Tweak it do I just loosen the hold down bolt and slightly rotate the whole assembly a bit at a time to get the light off. I figure I can disconnect the positive lead on the battery to reset it each time. Thank you.
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Old 04-07-2013, 10:38 PM   #36
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I have had the same issues since i replaced mine, have had the code twice, just reset it by turning the motor, other time just moved the opda by hand just barely and that worked too, think the bolt holding it down just isnt tight enough.
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Old 04-08-2013, 01:09 AM   #37
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Thank you, been driving me nuts I guess it has to be close since it does run. Might be that I didn't turn the oil shaft in the motor to line up the shaft so I wonder if it could be off a tooth. If so I wonder if I can go back one if I pull it back out and rotate the oil shaft drive one tooth so it is about back at the 4 position. I hate a CEL light on.
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Old 04-08-2013, 12:17 PM   #38
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went out this morning and reset it all first. the light only came on after really warmed up over the 160 mark so I knew I was close. I ended up moving it another qtr of an inch in about 4 tries and the light doesn't come on at all now so I must be within "range" of the pcm taking over it might still be off but a degree or two but i'm not going to worry about it now and she does run much better with no knocking sounds from the cps unit.
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Old 04-27-2013, 06:15 PM   #39
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Quote:
Originally Posted by Stankgearoil View Post
So I pulled it. Wear on the OPDA and camshaft is about the same. Will eventually get the Dorman, but like so many other people I'm waiting for some folks to put the miles on first.

What do you think? Does this look like serious wear to you?
This is what the wear should actually look like. Look for uniform wear all the way around. The problem I had was about 1/4 in on one half and about 1/2 in wear pattern on the other side. The "flats" across the face of each gear are another good sign. When they wear down to a knife edge you need to replace. If the gear on the cam looks this good I wouldn't touch a thing and would just check it every other oil change.
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Old 05-12-2013, 10:01 PM   #40
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OK I have successfully messed up my timing by removing the odpa. Yes I marked it but for some reason it was always one tooth off when I put it back in. I should have adjusted the oil pump slot but it is too late now. What I read on this thread is there are 2 ways to get it set back. Can someone tell me some details about either way to get the motor to TDC? Their are no marks on the crank that I can see. Mine will not start at all now.
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Old 05-12-2013, 10:53 PM   #41
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For TDC take out the #1 plug and rotate the balancer until the timing mark lines up perfectly and you have pressure in the #1 cylinder (finger in the hole...gigitty gigitty goo ). You might have to remove the belt to see the marks but they're there. Putting some white out on the marks makes it easier.
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Old 05-13-2013, 03:27 AM   #42
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Here are a couple links that describe the process with photos of the timing marks & proper positioning.


OPDA install


OPDA install w/photos Also post #5 here
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Old 05-14-2013, 11:23 AM   #43
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Thanks for the reply. Jeep still will not start. I must have some other issues. Had to get it towed to my local shop. I will post the findings.
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Old 05-14-2013, 01:21 PM   #44
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update. after 1700 miles with no issues i got the p0016 code. luckily a friend of mine had computer very similar to what the dealer uses. it relearned the new dorman opda and the code has not come back
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Old 05-14-2013, 08:35 PM   #45
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I have a dumb question about the OPDA whether it be the dorman or oem. As I look at these pictures every one with wear shows wear on both the cam gear on the OPDA and wear on the gear on the cam shaft

My question is with the worn gear on the cam isn't that just going to wear out the new part? I would think that both parts would need to be replaced.

I'm just asking. It seems like basic mechanics
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Old 05-15-2013, 11:42 AM   #46
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From reading up about the opda issue it would make since that the cam will have to be replaced also
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Old 05-15-2013, 07:53 PM   #47
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That's what I'm thinking. It seems logical but all that is said is here's my damaged OPDA and cam shaft. I put in my new OPDA no problems any more.

I apologize if I'm hijacking a little here but I am debating on whether to purchase the dorman unit but im not going to install it on a bad cam gear. It just seems dumb to do that.

I fly airplanes for a living so I am very engine sensitive.
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Old 05-16-2013, 05:15 PM   #48
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OEM opda is problematic design. If it were normal wear and tear , or both parts were defective, then yes, replacing both is logical. And of course replacing both parts is preferable if you have the $ even in this case but a new non-defective opda is a great mid term solution for less than $200 and 30 min. The cost of "doing right" can be significant if you take it to a legit mechanic. Gotta figure out how much more you plan on getting out of your current motor before you spend that kind of cheddar.
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Old 05-17-2013, 06:58 AM   #49
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From reading the other forum it was being said that a heavily damaged cam can damage a new opda
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Old 05-18-2013, 08:31 AM   #50
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From reading the other forum it was being said that a heavily damaged cam can damage a new opda
I can see that, but there are always variations. If you already have significant damage the, yes you are in a hard way. If you have an 05 I also understand that the cam metal was also not hardened enough. Like you I've been all around this and no perfect solution seems to exist. Like I said a new opda is only a cheap mid term, not long term, solution. Long term = big $.
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Old 05-18-2013, 10:46 PM   #51
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From reading up about the opda issue it would make since that the cam will have to be replaced also
I agree.

Here is an update on my Jeep. My local shop said the wear on my unit and cam were normal. I am replacing my OPDA with the Doreman unit with the hope of not having an issue later that will require me to replace the cam. I have 67,000 miles on the Jeep and don't want to basically pull the motor apart with out rebuilding it. My thinking is if you take the motor down to the point of removing the cam, then for just a little more money I can replace everything but the crank and have a fresh motor. (I would also have the head and block worked as well as replacing the parts) I will update as things progress.
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Old 05-25-2013, 06:07 PM   #52
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Installed my Dorman OPDA today. All is good. The original synchronizer had virtually no wear. If I look at it under a magnifying glass there is some shininess but virtually no wear. Jeep has 44,000 on it. Cam drive gear looked fine too.
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Old 07-13-2013, 11:44 AM   #53
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79,500 miles on OEM. Installed the Dorman OPDA this morning. The old one had wear similar to most on here (not terrible but definitely unusual wear). I didn't have any ticking or other noises but the wear was definitely there.

I'm not even close to a shade tree mechanic. Took me just over an hour to get everthing lined up, replace the OPDA, and six new spark plugs. Runs like a top and no codes after getting up to operating temperature and driving a few miles.
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Old 07-13-2013, 12:04 PM   #54
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It's best to do it on a brand new cam... that would be the closest thing to "starting fresh"

Otherwise, your new OPDA gear will get worn down to the same point in no time.

If your cam gear isn't too bad then I think it's worth a shot. Mine were getting close to resembling knife blades
A lot of bad/mis information here.

A. The OPDA issue is not as big of an issue as its made out to be.

B. Regardless if you're using the doorman unit(which I have one)or the regular OEM one, all the units will experience and show some wear on the teeth, and it will be the same pattern.

C. One thing that has NEVER been mentioned, but should is that they way the unit is held down in place. It can shift a bit due to loosening up over time. I have worked on over a DOZEN 05-06 TJ/LJ's including 2 of my own. I have found that NONE of them were correctly torqued down. All of the retaining bolts were able to be torqued down further to the correct tq. specifications.

D. When you combine the natural wear and tear on the gear set along with the potential for the unit to slightly rotate you can get the dreaded "code".

E. 4 of these OPDA's(including one on one of my LJ's)showed significant wear, but were still reusable just by resetting(slightly rotating)the OPDA back to the proper alignment to account for the wear on the gearset(one has gone on to log on another 30k since with 0 issues, and the OPODA gear already had that "knifeblade" wear pattern to its gear). Since then its been pulled a few times and Ive come to the conclusion that once the wear pattern is set in(which happens relatively quickly, within a few thousand miles)the natural wear over miles and time reduces significantly.

F. None have ever needed a camshaft replacement to compliment a new OPDA regardless.

Saying all this, its not a bad idea to have a backup OPDA on hand ready to go(which I do), and there are legit issues with a number of factory OPDA's being out of spec. which probably need to be replaced , but the problem is still way overblown, and its an easy and simple fix or swap out when that time does come. But before outright replacing it, I would actually just have the current unit inspected and most likely just reset/recentered and correctly tq'd down if throwing a code for the first time. If the OPDA is close within spec it should last roughly 100k or more. Even the ones that are not many times still last a lot longer than people realize.
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Old 07-13-2013, 12:06 PM   #55
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Quote:
Originally Posted by Stankgearoil View Post
So I pulled it. Wear on the OPDA and camshaft is about the same. Will eventually get the Dorman, but like so many other people I'm waiting for some folks to put the miles on first.

What do you think? Does this look like serious wear to you?
Its fine.
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Old 07-13-2013, 10:05 PM   #56
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What is the correct torque?.
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Old 07-14-2013, 11:05 AM   #57
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What is the correct torque?.
I believe the correct tq spec. is 22 ft. lbs., but let me double check that for you because the original service manual gives no indication, but the addendum has it(which I have, I just have to dig it out).
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Old 01-30-2014, 06:32 PM   #58
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I know this is an old thread, but I'm brand new to this forum and I just purchased the Dorman 689-201 camshaft synchronizer (OPDA) from Rockauto for $78.89 plus shipping. I plan to install it sometime over the winter. My original OPDA failed when the jeep was new with about 5k miles on it. Dealer replaced it under warranty. It only has about 16.5k miles on it now and it screams when I cold start it, just like it did before the first failure. I hope I can install it without getting a code, and I just wanted to let others know that these have come down in price.
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Old 01-30-2014, 07:39 PM   #59
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I know this is an old thread, but I'm brand new to this forum and I just purchased the Dorman 689-201 camshaft synchronizer (OPDA) from Rockauto for $78.89 plus shipping. I plan to install it sometime over the winter. My original OPDA failed when the jeep was new with about 5k miles on it. Dealer replaced it under warranty. It only has about 16.5k miles on it now and it screams when I cold start it, just like it did before the first failure. I hope I can install it without getting a code, and I just wanted to let others know that these have come down in price.
Thanks for the heads up! I plan on getting one soon too.
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Old 01-31-2014, 09:39 AM   #60
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I actually had to get rid of my TJ .. I took off the OPDA that I did the oil cup mod to before I traded it .. So I have it for sale if any one is interested .. Shot me a message if so ..

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