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Old 05-09-2015, 05:09 PM   #121
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Old 05-09-2015, 05:19 PM   #122
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You are now going to have to find TDC of cyl 1 on the compression stroke and align the timing marks on the harmonic balancer and the holes in the OPDA.

The belt tensioner has a square hole for a ratchet, insert ratchet, pull it back, remove belt.

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Old 05-10-2015, 04:37 PM   #123
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Before I add my questions to this thread is like to say Moreace, I feel you struggle sometimes I think Jeep engineers just like to put bolts in the most difficult places, to mess with us DIYers out there.
Now on to my question, does anyone know if Jeep changed the design of the OPDA when they put new OPDA's in as part of the recall? I had my jeep at a stealership in 2012 and they replaced the oil pump drive. I just did a bunch of work myself new exhaust, upgraded to 4 hole injectors, spark plugs, and some other things. Now the only trouble code I get is 0016 and at above 3200 rpm it goes into the fabulous limp home mode. Should I check the OPDA, just replace it with a crown OPDA, or just replace the crankshaft and camshaft position sensors?
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Old 05-10-2015, 04:45 PM   #124
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Here are the TDC marks on the crank pulley and block. The following pictures are from the 4.0L on my 05. Open the pictures in a new tab for high res.

Looking up from below the engine, the TDC mark on the crank pulley is circled.

And looking down from above the engine(w/ serpentine belt removed) there is the zero timing gauge.
Is there any video on how to fix the timing/ check engine light?
I have never taken a belt off or replaced.
How difficult is this whole process? How long should it take? What tools are needed.

I have not found and in depth instructions or videos on this portion of the OPDA fix threads.
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Old 05-10-2015, 05:23 PM   #125
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Watched some videos on removing and replacing the serpentine belt, seems easy. Just need to get the tool.
Do need to line the notch on the wheel up with the piece on the engine? OPDA on or off? Once the notch is line up with the engine, the 2 holes in the OPDA should line up?
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Old 05-10-2015, 06:21 PM   #126
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Only 1/2 the time, remember the crank goes around twice for every revolution of the cam/opda

So if the crank mark is lined up and number one is on TDC exhaust the opda should be 180 degrees from lining up holes

Next time around if number one piston is TDC compression the opda holes should line up

So you pull number one plug and see if your finger in the plug hole feels compression as you turn to crank mark
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Old 05-10-2015, 06:37 PM
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Watched some videos on removing and replacing the serpentine belt, seems easy. Just need to get the tool.
It is very straight forward. Best tool for that is a 1/2in breaker bar.

Quote:
Originally Posted by Moreace View Post
Do need to line the notch on the wheel up with the piece on the engine? OPDA on or off? Once the notch is line up with the engine, the 2 holes in the OPDA should line up?
Yep. Line the small notch up with the zero timing gauge. You turn the engine over with a 3/4in socket on the crank pulley in the CLOCKWISE direction. A breaker bar is nice for this, but not necessary.

If you can pull #1 spark plug like Digger84 mentioned that would make finding TDC easier, but if not, and you accidentally line up TDC 180* off on the exhaust stoke you won't hurt anything and the engine will still run.
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Old 05-10-2015, 06:48 PM   #128
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OPDA in or out while lining up the tick mark?
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Old 05-10-2015, 06:49 PM
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Quote:
Originally Posted by Jeepinb52 View Post
does anyone know if Jeep changed the design of the OPDA when they put new OPDA's in as part of the recall? I had my jeep at a stealership in 2012 and they replaced the oil pump drive. I just did a bunch of work myself new exhaust, upgraded to 4 hole injectors, spark plugs, and some other things. Now the only trouble code I get is 0016 and at above 3200 rpm it goes into the fabulous limp home mode. Should I check the OPDA, just replace it with a crown OPDA, or just replace the crankshaft and camshaft position sensors?
I do not believe it has been redesigned. I could be wrong though. You should definitely check the OPDA, and if the gears are worn replace it with the Crown unit. There is a procedure for checking the OPDA I posed a page or 2 back.

I would suggest before you go to remove the OPDA you should check to make sure you didn't bump the housing while doing the spark plugs. First remove the OPDA cover and then turn the engine to TDC while watching the holes in the OPDA. FYI for every 1 rotation of the OPDA target wheel the crankshaft turns twice. Check how close the hole in the the OPDA target wheel is to the one in the housing (should be perfectly lined up).
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Old 05-10-2015, 06:51 PM
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OPDA in or out while lining up the tick mark?
OPDA in.
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Old 05-10-2015, 06:51 PM   #131
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Opda out with pin inserted then after mark lined up insert opda with pin knowing outside will rotate some as it slides home but pin makes outside rotate with center so it stays timed right

The tooth forces the rotation as it slides against cam gear teeth but pin keeps it timed right as it rotates home
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Old 05-10-2015, 07:58 PM   #132
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Everything you ever wanted to know, and more, on OPDAs is here:
2005-06 Jeep OPDA_CPS_Distributor Failure - JeepForum.com

There are videos/procedures for installing an OPDA with a disturbed engine in that thread and on YouTube.
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Old 05-10-2015, 10:37 PM   #133
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Before taking the belt off, I thought it be wise to scope out first. I looked from every angle including underneath, but couldn't find this tick mark. It's on the main crank pully you rotate to turn the engine? I can see the whole wheel, is it under the belt? Also, couldn't find that nub to line it up to.
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Old 05-10-2015, 11:45 PM   #134
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It is almost impossible to see without removing the belt as advised above. The photos above are a bit dark so here are some links that should be helpful. Checking a few posts before & after will have more info too. Read & follow, including what to do if you get the alignment (sync) off when installing & get the P0016.

Setting the OPDA with photos

Also here w/3 photos -- belt off, & positions of housing in & coming out
Opda install help! - JeepForum.com

Photo of the belt off & timing marks with directions for proper alignment

Installed new OPDA and it still wont start, ideas? - JeepForum.com


Resetting OPDA after P0016

2005-06 Jeep OPDA_CPS_Distributor Failure - Page 241 - JeepForum.com
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Old 05-11-2015, 12:04 AM
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Quote:
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Before taking the belt off, I thought it be wise to scope out first. I looked from every angle including underneath, but couldn't find this tick mark. It's on the main crank pully you rotate to turn the engine? I can see the whole wheel, is it under the belt? Also, couldn't find that nub to line it up to.
In my photos above the belt looks like it has not been touched, but it is partially removed. All you need to do is remove the belt where it goes from the power steering pump pulley to the water pump/fan pulley and you should be able to see the timing gauge through there.
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Old 05-11-2015, 08:35 AM   #136
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Great info. Thanks.
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Old 05-11-2015, 03:33 PM   #137
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All... at long last, I think it's done. Reset the battery, warmed up the engine and took a short spin around the block and no check engine light. Fingers crossed it's all done and we're on to the next project.

Thanks again for all the amazing help. I'd be nowhere without you.
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Old 05-11-2015, 04:51 PM   #138
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Good to see that you got her done. Sorry to hear it was such a PITA.
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Old 08-06-2015, 08:32 PM   #139
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My Rev B OPDA at 49k. No symptoms at all.
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Old 08-08-2015, 03:49 PM   #140
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My Rev B OPDA at 49k. No symptoms at all.
What brand?
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Old 08-20-2015, 11:00 PM
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What brand?
That is a factory OPDA. I believe the manufacturer is LDI. They had a Rev E and Rev B - both revisions have the opda issue.
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Old 08-22-2015, 06:56 PM   #142
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What brand?
It's the factory unit.
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Old 08-23-2015, 10:45 AM   #143
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It's the factory unit.
lol I thought you were gonna replace it
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Old 08-24-2015, 01:17 PM   #144
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I did replace it with a Crown. The picture is from after the swap.
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Old 08-24-2015, 06:38 PM   #145
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I did replace it with a Crown. The picture is from after the swap.
Ah ok! Good!

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