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Knock from oil pan ? 4.0

Old 11-14-2013, 05:30 PM
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Originally Posted by BlueRidgeMark
Yep. Before you wish you had done it sooner.

Just consider it as preventive maintenance, like an oil change.

Thank you, Mark. Well stated and true.
Old 11-15-2013, 11:43 AM
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I'm going to do mine later tonight, fingers crossed the plate isn't cracked!
Old 11-15-2013, 02:20 PM
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Originally Posted by jj1562
I'm going to do mine later tonight, fingers crossed the plate isn't cracked!
Good possibility it isn't...
Old 11-15-2013, 11:45 PM
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Unfortunately I couldn't do it at work today, depending how much fishing I get in this w/e, I'll try to get to it
Old 11-16-2013, 10:32 AM
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okay so here's some more information, if I put it in neutral, & I rev it up a bit, you can hear it at about 2000 rpms
Old 11-16-2013, 01:41 PM
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Originally Posted by Ye Ol' Cherokee
okay so here's some more information, if I put it in neutral, & I rev it up a bit, you can hear it at about 2000 rpms
Please don't tak offense of this, but you need to CHECK the bolts before discussing/videoing/sound byting/guessing/pondering/asking any more.
Old 11-16-2013, 02:09 PM
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Originally Posted by cruiser54
Please don't tak offense of this, but you need to CHECK the bolts before discussing/videoing/sound byting/guessing/pondering/asking any more.
No offense taken. I just can't check it until monday, so i just figured id post what i forget to mention. Ill post back with the results. I plan on making a video, if it turns out good, ill post the link for everyone
Old 11-16-2013, 02:25 PM
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Originally Posted by Ye Ol' Cherokee
No offense taken. I just can't check it until monday, so i just figured id post what i forget to mention. Ill post back with the results. I plan on making a video, if it turns out good, ill post the link for everyone
Good to know.

My feeling on the bolts is that everyone should just do it as a maintenance item.
Old 11-17-2013, 08:44 PM
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Hopefully I'll get to mine tomorrow night, I'll post the results
Old 11-17-2013, 09:38 PM
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Originally Posted by jj1562
Hopefully I'll get to mine tomorrow night, I'll post the results
We're counting on that!!
Old 11-19-2013, 12:51 AM
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So I finally was able to check the flex plate bolts, all were tight and no visible crack, one 18 mm bolt that holds the cover on was loose, pita to get the cover back on! Started her up and no more knock until she got warm, and there it is, doesn't seem as loud but it's still there, my friend suggested to try mobile one oil being the knock only started after I did 2 oil changes with the rotella, could this be the problem? Maybe a thicker oil?
Old 11-19-2013, 04:09 AM
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I tried out some 10w-30 Synblend at my last oil change, and that exact noise that you have returned. I had not heard it in a long time... Not at all while I was using Mobil 1 TDT 5w-40. After I use up my other 6 qts of Kendall I will be switching back.
Old 11-19-2013, 07:02 AM
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Originally Posted by jj1562
my friend suggested to try mobile one oil being the knock only started after I did 2 oil changes with the rotella, could this be the problem? Maybe a thicker oil?
What type Rotella? T or T5? What viscosity? The Rotella dino oil (T) and the 4.0 go together like peas & carrots. The 4.0 is very old technology built with sloppy tolerances due to its antiquated assembly line....not a good match for synthetic IMO.
Old 11-19-2013, 07:17 AM
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T3 yummy.
Old 11-19-2013, 07:36 AM
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Rotella 15w-40, year around in my XJ. You can almost hear the engine thanking you...

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