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XJ Ask the Question Thread
04-24-2014, 02:51 PM
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Location: Mercer County, NJ
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Year: 2001
Model: Cherokee
Engine: 4.0L I6 HO
I hate getting into this discussion, because everyone seems passionate about their own opinion. Not everyone can be right.
That said, my understanding of synthetic oils is thus: if you have existing leaks with conventional oil (including small unnoticed ones) they will get worse on a swap to synthetic because the same weight synthetic is "slipperier" than it's conventional counterpart. More slippery in this case means more likely to go through the gaps in the seals. If you don't have any leaks (you probably don't actually own a jeep) you're great because the synthetic is better for the engine than the conventional oil. Just be prepared to fix that leak you've been ignoring or didn't notice.
Now that I've made that statement, let me make another disclaimer. From what I can tell, very few people outside of the community that designs oil truly understand how it works. (meaning the scientists that create it and the engineers that design the engines) Everyone else has their own opinion that may or may not be true.
Let the tearing apart of my post begin!
That said, my understanding of synthetic oils is thus: if you have existing leaks with conventional oil (including small unnoticed ones) they will get worse on a swap to synthetic because the same weight synthetic is "slipperier" than it's conventional counterpart. More slippery in this case means more likely to go through the gaps in the seals. If you don't have any leaks (you probably don't actually own a jeep) you're great because the synthetic is better for the engine than the conventional oil. Just be prepared to fix that leak you've been ignoring or didn't notice.
Now that I've made that statement, let me make another disclaimer. From what I can tell, very few people outside of the community that designs oil truly understand how it works. (meaning the scientists that create it and the engineers that design the engines) Everyone else has their own opinion that may or may not be true.
Let the tearing apart of my post begin!
Get back on topic. Leave the oil threads for the oil threads
04-24-2014, 03:20 PM
Beach Bum
Emergency Stop
After a lifting and aligning, adding tires & armor. Who tests for an emergency stop from around 35-40 mph?
I like to do it to see how the jeep will react, which tire/tires lock up, which direction it pulls and how hard, what breaks/falls off,etc...
I like to do it to see how the jeep will react, which tire/tires lock up, which direction it pulls and how hard, what breaks/falls off,etc...
04-24-2014, 03:42 PM
CF Veteran
Cruel buzzard! Kicking a guy when he's down...
I plan to continue searching for my next square-okee while driving this '05 Subaru Baja. Who knows, maybe I'll find a gem like my old friend (may it rest in pieces).
I plan to continue searching for my next square-okee while driving this '05 Subaru Baja. Who knows, maybe I'll find a gem like my old friend (may it rest in pieces).
04-24-2014, 04:39 PM
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Year: 1998
Model: Cherokee
Engine: 4.0
So my 4.0 is leaking oil on the hex shaped adapter that the oil pressure sending unit attaches to the engine block. Is there a gasket between the hex adapter and the engine block? The sending unit itself is not leaking, or the o rings for the oil filter adapter. Hope this makes sense...
04-24-2014, 04:45 PM
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Year: 1993 YJ Wrangler
Engine: 4.0 I6
So my 4.0 is leaking oil on the hex shaped adapter that the oil pressure sending unit attaches to the engine block. Is there a gasket between the hex adapter and the engine block? The sending unit itself is not leaking, or the o rings for the oil filter adapter. Hope this makes sense...
04-24-2014, 05:01 PM
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Year: 1998
Model: Cherokee
Engine: 4.0
Oil filter adapter. Get the O-ring kit from the stealership, and figure out if you have the Torx T-60 or the 14mm (9/16") Allen key bolt. I have the 14mm hex on mine, and I used a coupling (extra long nut) with a 14mm outer diameter. I put a socket on that, and used a breaker bar. Easy peasy.
04-24-2014, 06:39 PM
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
#2 Permatex to seal the pipe threads and you'll be fine. Clean everything up real good first.
04-24-2014, 06:40 PM
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Year: 1998
Model: Cherokee
Engine: 4.0
04-24-2014, 06:51 PM
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
04-24-2014, 07:03 PM
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Year: 1998
Model: Cherokee
Engine: 4.0
04-24-2014, 08:12 PM
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Year: 1990
Model: Cherokee
Engine: 4.0
Mystery Part
Let's play can you guess the part?
Hints:
It's magnetic.
It was laying in the bottom of the distributer housing covered in goo.
Hints:
It's magnetic.
It was laying in the bottom of the distributer housing covered in goo.
04-24-2014, 08:13 PM
::CF Moderator::
Join Date: Aug 2011
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
04-24-2014, 08:24 PM
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Year: 1990
Model: Cherokee
Engine: 4.0
Necessary?
Edit: Obviously not, as it runs without it. Now that you identified it, (Thank you!) I was able to find/read quite a few threads on it. So basically my injectors are batch firing without it instead of sequentially like they would if they were getting a signal from the sync generator. Should I even bother trying to hook it back up?
Edit: Obviously not, as it runs without it. Now that you identified it, (Thank you!) I was able to find/read quite a few threads on it. So basically my injectors are batch firing without it instead of sequentially like they would if they were getting a signal from the sync generator. Should I even bother trying to hook it back up?
Last edited by GreatPumpkin; 04-24-2014 at 08:49 PM.
04-24-2014, 09:49 PM
::CF Moderator::
Join Date: Aug 2011
Location: Prescott, Az
Posts: 43,971
Received 1,559 Likes
on
1,263 Posts
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Necessary?
Edit: Obviously not, as it runs without it. Now that you identified it, (Thank you!) I was able to find/read quite a few threads on it. So basically my injectors are batch firing without it instead of sequentially like they would if they were getting a signal from the sync generator. Should I even bother trying to hook it back up?
Edit: Obviously not, as it runs without it. Now that you identified it, (Thank you!) I was able to find/read quite a few threads on it. So basically my injectors are batch firing without it instead of sequentially like they would if they were getting a signal from the sync generator. Should I even bother trying to hook it back up?