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Unread 11-09-2011, 12:31 PM   #2236
jeep06
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So does anyone know the limit of ZDDP you can run with out plugging the 'cat'? Not sure if the ZR1 levels are high enough to cause problems, just thought I would ask in case there is a chance of ruining my cat convertor. TIA

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Unread 11-09-2011, 12:40 PM   #2237
Heath
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Quote:
Originally Posted by jeep06
So does anyone know the limit of ZDDP you can run with out plugging the 'cat'? Not sure if the ZR1 levels are high enough to cause problems, just thought I would ask in case there is a chance of ruining my cat convertor. TIA
You are going to plug a cat way faster with bad/wrong/incorrect mixture fuel than you ever will from high zddp oil. It's a nonissue.
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Unread 11-09-2011, 01:45 PM   #2238
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Not too mention that if the ZDDP level was an issue for a cat I'd rather replace a clogged cat than replace a 4.0l.
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Unread 11-09-2011, 04:48 PM   #2239
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Quote:
Originally Posted by willydigger View Post
I have a knock with every oil change. Sometimes during cold days I'll start with a knock. I turn everything off and restart and it's fine.

I had it with 5w40, 5w30, and 10w30. It doesn't bother me at all. I plan to continue with 5w40.
Same here.
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Unread 11-09-2011, 06:18 PM   #2240
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Quote:
Originally Posted by jeep06 View Post
So does anyone know the limit of ZDDP you can run with out plugging the 'cat'? Not sure if the ZR1 levels are high enough to cause problems, just thought I would ask in case there is a chance of ruining my cat convertor. TIA
The ZDDP won't plug the cat, it only renders if ineffective. So, your Jeep will run fine, you just won't pass the smog test if your area has one.
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Unread 11-10-2011, 08:53 AM   #2241
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Seriously, mine went from sounding like it was about to throw a rod to running like a Swiss watch. I would even catch it knocking while on the hwy and do a restart at 60MPH to clear it. It's amazing what a different grade of oil and an additive can do.
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Unread 11-10-2011, 10:26 AM   #2242
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I still can't get behind the thick and heavy diesel oils though...I realize that oil is sufficient for full warm up temp running (right at 210 for mine) but initial start up in cold weather seems like it would be to thick. Ideally you need an oil that will for sure push throughout the motor in colder weather and lubricate properly. Anybody running the diesel oils notice a change in oil pressure? I realize the stock oil pressure gauge is **** but just wanted to know if there was higher oil pressure or not.
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Unread 11-10-2011, 10:31 AM   #2243
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Dude, just run Mobil 1 and be done with it. Yeah its expensive but it is some really good stuff and it's easy to get. I throw in a bottle of zddp plus for added protection but I don't think I need it. My opda gear and cam gear show little to no wear and my motor is silent.
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Unread 11-10-2011, 11:21 AM   #2244
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Quote:
Originally Posted by FleshEater View Post
I still can't get behind the thick and heavy diesel oils though...I realize that oil is sufficient for full warm up temp running (right at 210 for mine) but initial start up in cold weather seems like it would be to thick. Ideally you need an oil that will for sure push throughout the motor in colder weather and lubricate properly. Anybody running the diesel oils notice a change in oil pressure? I realize the stock oil pressure gauge is **** but just wanted to know if there was higher oil pressure or not.
Mobil 1 TDT is for mixed fleet and is not a typical heavy diesel oil. It is a 5w40. Don't confuse it with traditional diesel oil. The first page has more detailed info including links to Mobil 1.

Otherwise use VR1 or an additive to your preferred oil.
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Unread 11-11-2011, 12:47 PM   #2245
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I've replaced my OPDA after 114,331 miles, without any extreme wear on it just normal contact patch pattern. It was just wear & tear without proper lubrication. Are there any up dated parts I can get to rebuild the old one, it's in great shape.
Just wondering Thanks.
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Unread 11-11-2011, 12:52 PM   #2246
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Nothing new and improved is out. You'd have to replace in kind with the same unit.

Do you have any pics of the old unit? I'd love to see the wear pattern.

Any other details you'd be willing to offer?
Oil type?
Frequency of change?
Driving habit, highway v. city?
Were you always in VT?

I was curious if cold weather starts could be a factor to premature wear. Apparently not.
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Unread 11-11-2011, 01:20 PM   #2247
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Thanks I've already replaced it with one from the dealer ( $140 ) I would like to rebuild the old.one

Rotella 10W-30 every 3K since 87,000K before that Castrol GTX 10W-30 ( I use my trip-ometer to help with the change's )
I mostly drive State routes with occasional Interstate driving ( 5 to 10 over the limit )
Yes it's been a Vermont driving Jeep
I'll have the pix up shortly for you Willydigger!
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Unread 11-11-2011, 01:32 PM   #2248
willydigger
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Originally Posted by silvanus View Post
Thanks I've already replaced it with one from the dealer ( $140 ) I would like to rebuild the old.one

Rotella 10W-30 every 3K since 87,000K before that Castrol GTX 10W-30 ( I use my trip-ometer to help with the change's )
I mostly drive State routes with occasional Interstate driving ( 5 to 10 over the limit )
Yes it's been a Vermont driving Jeep
I'll have the pix up shortly for you Willydigger!
There is nothing easily obtainable to replace the old one. You'd have to source aftermarket bushings and get a new gear. It's easier just to toss it and spend the $140. If you want a spare take advantage of the $140 price. It can skyrocket at any time.

There is nothing extraordinary about your set up. Seems reasonable. Why yours has lasted so long while others have failed early is still a mystery.

Can you disassemble the old one to get images of the shaft in addition to the gear wear? I'm curious how the upper bushing area looks. Do you see and "sludge specks" in the target wheel chamber on the top of the OPDA?
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Unread 11-12-2011, 09:35 AM   #2249
pwmac
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Quote:
Originally Posted by willydigger View Post
--snip--
I'm curious how the upper bushing area looks. Do you see and "sludge specks" in the target wheel chamber on the top of the OPDA?
=======
I seem to have lost my focus and do not remember this question.
What is the significance of the sludge on the tone ring area?
Refresh on my unit:
When I did the Fog mod on my 06 @20k miles it was in good shape but had the sludge - top area. My opda had been replaced as evidence of silicone instead of the gasket. It had one of the three oil holes functional for lower bearing lube and I drilled them all out. Top bushing was nicely oiled.
Thnaks, PaulW
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Unread 11-19-2011, 04:36 PM   #2250
98xjroks
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Originally Posted by willydigger View Post
Is the 2004 CPS gear compatible with the 2005-06 gear without modification? NO.

Can the 2004 CPS gear fit with the 2005-06 gear without drilling a new hole in the shaft? YES.

Please see the attached images.

First is the roll pin. The larger is 3/16 and fills the 2005-06 OPDA shaft hole.



Here is a side by side of the 2004 and the 2005-06 gear. Left is the 2005 (large hole).



With regards to all other specs they look the same.







The hole alignment relative to the tooth location is offset a little. This means if you were to pull the OPDA and use this gear it would not install exactly the way it was removed. I don't believe TDC or the sharpie would match exactly. The below pics show the 2004 gear drilled to 3/16. The 2004 gear is on the left.





To modify the old 2004 gear to fit the larger hole for the 2005-06 shaft you will have to drill out one side of the 2004 gear. Use a 3/16 drill bit. It would be best to have a vise and press. I didn't have any of that at the house so I used a steady hand instead.

Drill one side to 3/16. Once you have the hole drilled, place the gear on the shaft so the holes line up. From there you can insert the drill bit and drill the opposite hole. Without a press and vise the shaft hole may egg a little bit. The roll pin should handle a small imperfection in the hole. I ran the drill through and tapped in the roll pin with no issues.

I believe this is an easier method than an aftermarket gear and drilling a new hole through the existing shaft.

Forgive me if this has already been done, but can someone direct me to the post covering the 04-05 gear use/wear results? I like the looks of this gear a lot.
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