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Old 08-30-2014, 02:39 AM   #1
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The opda from hell

Ok so like a lot of new 05 tj/LJ owners I found out the hard way about the opda issue. I had the barrel of laughing monkeys and so I ordered the new crown opda and replaced it today using the top dead center method. Although I'm sure I messed up and will have to realign it so I have to take out the number one spark plug to get it to be more accurate. That will be tomorrow.

Although my issue is that after installing it, even though it needed to be realigned I continue to have that horrible noise and I removed the new opda and the gear already shows signs of wear.

Why would that happen could it be the alignment alone or could it be my camshaft?

I know there are tons of threads on the subject but I can't understand why the brand new opda would already have wear on it sorry for adding another thread to this very annoying subject.

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Old 08-30-2014, 04:05 AM   #2
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Attachment 1438210

^^^That would indicate that your camshaft gear is also damaged!

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Old 08-30-2014, 04:08 AM   #3
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That's what I feared.
Is there a write up on that somewhere is that something I could do or do I have to bring it in?
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Old 08-30-2014, 04:45 AM   #4
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That's what I feared. Is there a write up on that somewhere is that something I could do or do I have to bring it in?
You could do it but it's no simple matter. You are going to have to remove all the lifters, remove the timing chain, and pull the camshaft out of the front of the engine. So you are either going to have to remove the front of your jeep or pull the motor to get at it..
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Old 08-30-2014, 05:29 AM   #5
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Awesome..I guess I'm gonna get railed by a shop somewhere
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Old 08-30-2014, 09:29 AM   #6
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Can we see a picture of the wear on the gear teeth? And how long did the engine run with the new OPDA installed?
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Old 08-30-2014, 10:01 AM   #7
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Before you go spend $1000+ on what one guy said on the internet, you should do some careful evaluation. Take out the OPDA and see how smooth it spins. Does the jeep have oil? Is there oil pressure? Have you tried adding oil to the gear before you install?
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Old 08-30-2014, 10:34 AM   #8
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You should also be able to get a pretty good look at least a few teeth of the camshaft gear by shining a light down the OPDA mounting hole.
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Old 08-30-2014, 06:53 PM   #9
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The jeep has good oil pressure and oil in it I haven't tried to put oil on the gear before hand. But before I messed up the alignment it ran continuously but ran weird. The last time I took it out I messed it up and now it won't even start.
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Old 08-30-2014, 08:44 PM   #10
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Idk what a bad can gear looks like but if I had to guess



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Old 08-30-2014, 09:40 PM   #11
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What bothers me in that picture is it looks like there is no oil on the shaft at all.
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Old 08-30-2014, 09:58 PM   #12
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Why would that happen could it be the alignment alone or could it be my camshaft?
Could it be that you did not have the oil pump properly indexed to the drive?

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The jeep has good oil pressure...
But did it have oil pressure after you installed the OPDA?
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Old 08-30-2014, 10:27 PM   #13
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Idk what a bad can gear looks like but if I had to guess
Oh that sucks. Got to wonder what that has done to the rest of your motor.
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Old 08-30-2014, 10:46 PM   #14
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How long was the original OPDA squealing before you replaced it?
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Old 08-30-2014, 11:42 PM   #15
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There is a TDC mark on the front belt pulley. You can see it with a mirror. Turn the crank using a wrench on that big bolt in direction of operation ONLY until the mark EXACTLY lines up. You absolutely must not back it up even then very smallest amount to align the marks. Then drop the OPDA in with the wheel pinned and clock as needed for your installation. Then remove the pin, only after it is torqued down and cannot move.

As to why you have a grinding sound with the new OPDA beats me. Are you sure it was down into the mounting hole fully and seated and torqued down on the lock screw/plate? You removed the lock pin?

All 04 to 06 Jeeps need a new OPDA now. Do not wait until it squeaks or seizes. Remove it and replace it now! It is really quite easy to do.
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Old 08-31-2014, 12:07 AM   #16
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How long was the original OPDA squealing before you replaced it?
Was squealing for maybe three days till I found out what it was and stopped driving it.
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Old 08-31-2014, 12:12 AM   #17
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There is a TDC mark on the front belt pulley. You can see it with a mirror. Turn the crank using a wrench on that big bolt in direction of operation ONLY until the mark EXACTLY lines up. You absolutely must not back it up even then very smallest amount to align the marks. Then drop the OPDA in with the wheel pinned and clock as needed for your installation. Then remove the pin, only after it is torqued down and cannot move. As to why you have a grinding sound with the new OPDA beats me. Are you sure it was down into the mounting hole fully and seated and torqued down on the lock screw/plate? You removed the lock pin? All 04 to 06 Jeeps need a new OPDA now. Do not wait until it squeaks or seizes. Remove it and replace it now! It is really quite easy to do.
What would happen if I did go in the opposite direction I ask only because before I read that somewhere else I had already done it..

It was seated and torqued and the pin was removed

Thanks for the Tdc tip I'll try to find the mark but I've had no luck so far I'll try the mirror next time.
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Old 08-31-2014, 12:14 AM   #18
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What bothers me in that picture is it looks like there is no oil on the shaft at all.
What should it look like? Would that mean I don't have enough oil in my engine?
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Old 08-31-2014, 01:47 AM   #19
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What would happen if I did go in the opposite direction I ask only because before I read that somewhere else I had already done it..

It was seated and torqued and the pin was removed

Thanks for the Tdc tip I'll try to find the mark but I've had no luck so far I'll try the mirror next time.
There is a small notch or mark. It is by far the best way.

The problem with turning backwards is that there is lash in the gears, if you go past TDC or past the mark and then try to back up to it, you are reversing the lash or slop and will not actually be at TDC or mark alignment.

You cannot back up and get correct timing. That is why. The lash/slop needs to be taken up in the direction of operation for correct timing to occur at TDC or mark alignment.

I would not fool with trying to get TDC on the piston, find and use the timing mark on the pulley.

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Old 08-31-2014, 02:41 AM   #20
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There is a small notch or mark. It is by far the best way. The problem with turning backwards is that there is lash in the gears, if you go past TDC or past the mark and then try to back up to it, you are reversing the lash or slop and will not actually be at TDC or mark alignment. You cannot back up and get correct timing. That is why. The lash/slop needs to be taken up in the direction of operation for correct timing to occur at TDC or mark alignment. I would not fool with trying to get TDC on the piston, find and use the timing mark on the pulley. J
alright thanks for all the advice.
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Old 08-31-2014, 08:23 AM   #21
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The problem with turning backwards is that there is lash in the gears...
The slop in the timing chain is a far more significant factor than gear lash.

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I would not fool with trying to get TDC on the piston, find and use the timing mark on the pulley.
Would you recommend setting TDC on the compression stroke?
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Old 08-31-2014, 09:04 AM   #22
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None of that stuff matters anymore, as your second photo shows clearly broken teeth on the drive gear on your camshaft. You shouldn't even start that motor up again before having someone tear it down and replace the cam. The damage from the metal floating around in your engine could already be severe. You should have that rig towed to a shop for an engine tear down. I wouldn't even turn it over with a wrench if it was mine.

Just a comment on setting the engine at TDC for OPDA synchronization - Note that the crank shaft rotates twice for every rotation of the OPDA, so when you align the crankshaft TDC marks you may be 180 degrees off on the OPDA or in the right spot. It needs to be on the compression stroke for number 1 cylinder.
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Old 08-31-2014, 10:19 AM   #23
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Yes, I should have included the timing chain in the "slop" as it too is significant in the matter.

Yes, when I said not to use the number one on TDC and use the timing mark, I was not clear, thanks for pointing that out. Yes indeed set with number one on compression of course but what I am saying as well is do not use the piston position at TDC to set the OPDA, use the timing mark.

To do this more easily, remove all plugs. Then it becomes quite easy to turn the crank with a large wrench. If you go too far and miss the mark, well, you have to go back around.

On second thought, I think the electronic ignition fires twice per revolution. So it would not matter. You just need number one on TDC.
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Old 08-31-2014, 11:07 AM   #24
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On second thought, I think the electronic ignition fires twice per revolution. So it would not matter. You just need number one on TDC.
And the ODPA is related to the "electronic ignition" in what way?
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Old 08-31-2014, 11:40 AM   #25
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And the ODPA is related to the "electronic ignition" in what way?
It's also the dizzy.
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Old 08-31-2014, 12:04 PM   #26
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And the ODPA is related to the "electronic ignition" in what way?
I am not going to argue with you. I installed my OPDA and now two others in other Jeeps just as I said with no issues and no codes. You know the OPDA sensor signals the ECM to provide a spark and it does so twice per cycle. TDC is TDC, the ECM does not know or care as long as the spark is signaled at TDC, be it compression or exhaust stroke.

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Old 08-31-2014, 12:58 PM   #27
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I am not going to argue with you. I installed my OPDA and now two others in other Jeeps just as I said with no issues and no codes. You know the OPDA sensor signals the ECM to provide a spark and it does so twice per cycle. TDC is TDC, the ECM does not know or care as long as the spark is signaled at TDC, be it compression or exhaust stroke.

J
The OPDA fires the fuel injectors, not the spark, and it has to be timed correctly.

But again, that's not really an issue for the OP as the drive gear on his camshaft has been destroyed and he now needs to have the engine torn down to find out the extent of the damage it has caused. Don't rotate the engine as you will only do more damage at this point. Did you guys see the same photos I saw in his post above?
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Old 08-31-2014, 01:12 PM   #28
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I am not going to argue with you. I installed my OPDA and now two others in other Jeeps just as I said with no issues and no codes. You know the OPDA sensor signals the ECM to provide a spark and it does so twice per cycle. TDC is TDC, the ECM does not know or care as long as the spark is signaled at TDC, be it compression or exhaust stroke.
Fact is, I know the OPDA has nothing whatsoever to do with providing a spark. And spark certainly is not provided at TDC on any stroke.

Fact is, the ODPA needs to be installed at TDC on the compression stroke.

Another useful fact: using the internet as a substitute for the service manual is a sure way to become seriously misinformed.
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Old 08-31-2014, 07:42 PM   #29
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Originally Posted by LJ Dave;13078578[B
]None of that stuff matters anymore, as your second [/B]photo shows clearly broken teeth on the drive gear on your camshaft. You shouldn't even start that motor up again before having someone tear it down and replace the cam. The damage from the metal floating around in your engine could already be severe. You should have that rig towed to a shop for an engine tear down. I wouldn't even turn it over with a wrench if it was mine.

Just a comment on setting the engine at TDC for OPDA synchronization - Note that the crank shaft rotates twice for every rotation of the OPDA, so when you align the crankshaft TDC marks you may be 180 degrees off on the OPDA or in the right spot. It needs to be on the compression stroke for number 1 cylinder.
^^^You are correct!!!!!!
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Old 08-31-2014, 10:12 PM   #30
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Listen to these guys as they are correct spark is from crank angle sensor but cam angle sensor in that unit controls fuel injection timing

However more important is that without good cam gear the the oil pump drive is questionable at best and running engine without oil pump running is a very bad idea

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