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Unread 10-20-2013, 10:49 AM   #1
2Xtreme
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Blasted pinging was NOT my engine...

...unless the (used) engine I just put in has the exact same problem - knocking under load. (reference my previous thread http://www.jeepforum.com/forum/f8/he...nging-1519237/ ).
I finally got the Jeep out on the road and it's still making the same knock, under same conditions.

My first thought was the tranny (TH400), so I started researching that.

From there I saw mentions of cracked flex plates (I reused my old one), busted driveshaft yokes, Tcase chain slipping, and others.

Now my question is, where do I start looking, now that the engine is out of the equation?

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Unread 10-20-2013, 11:50 AM   #2
Dougyfreshh
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Does the motor have an egr valve if so check if its operating properly if it is maybe the passage way under egr is clogged or maybe the motor is Outa timing
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Unread 10-20-2013, 12:03 PM   #3
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No EGR valve.
Quite sure it's not engine related.
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Unread 10-20-2013, 12:19 PM   #4
Matt1981CJ7
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2X,

Damn that's to bad.

Is the knocking always under load? If so, when was the last time you checked the u-joints?

Matt
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Unread 10-20-2013, 12:23 PM   #5
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Quote:
Originally Posted by Matt1981CJ7
2X, Damn that's to bad. Is the knocking always under load? If so, when was the last time you checked the u-joints? Matt
You have no idea how defeated I felt when it started....

Always under load, but never in first...
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Unread 10-20-2013, 01:09 PM   #6
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Has anyone asked what grade of gas you're burning? My 258 will accept nothing less than mid grade, and the more octane, the happier my selfish beast is.
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Unread 10-20-2013, 01:15 PM   #7
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Quite sure it's NOT engine related....
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Unread 10-20-2013, 01:26 PM   #8
motiv8ya
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I had that once on my first 79' Cj7 with the th400, turned out to be a loose flex plate bolt that was contacting the inspection cover.
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Unread 10-20-2013, 02:26 PM   #9
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Quote:
Originally Posted by motiv8ya
I had that once on my first 79' Cj7 with the th400, turned out to be a loose flex plate bolt that was contacting the inspection cover.
Wouldn't that be constant, load or no load?
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Unread 10-20-2013, 05:23 PM   #10
chris989604
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Mcleod clutch

I installed a Mcleod clutch behind my V8 and the thing was a few thousandth to large and would drag on disc and just barely put paint on the bell housing. If your thrust bearing is worn a little maybe it could be walking back and tapping the housing or pressure plate bolts to long??? Is it RPM related or more relative to the drive shaft RPM?

I had a 327 with a bad thrust plate but it walked forward more than back. Anyway, I installed a Luke clutch and never had another problem.

It is a long shot,
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Unread 10-20-2013, 07:10 PM   #11
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Quote:
Originally Posted by chris989604
...It is a long shot, CHris
VERY long shot, considering the TH400 is an AUTOMATIC transmission....
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Unread 10-20-2013, 07:27 PM   #12
BlkCJ7Laredo
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If it's doing it only under load perhaps it's contacting something that only occurs when the engine flexes on the mounts under torque.. What shape were the motor mounts in when you swapped the engine?
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Unread 10-20-2013, 08:47 PM   #13
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Quote:
Originally Posted by BlkCJ7Laredo View Post
If it's doing it only under load perhaps it's contacting something that only occurs when the engine flexes on the mounts under torque.. What shape were the motor mounts in when you swapped the engine?
Less than 1000 miles.....
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Unread 10-20-2013, 09:01 PM   #14
lucdog
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The inspection cover that gets removed to take the torque converter bolts off the flexplate. Remove the cover, see what happnens. Mine would rub under load.

Bill
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Unread 10-20-2013, 11:31 PM   #15
motiv8ya
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Quote:
Originally Posted by 2Xtreme

Wouldn't that be constant, load or no load?
Mine happened under load, don't know why it was so pronounced under load and not when idling but removing and reinstalling each bolt with some loc-tite fixed it.
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