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Unread 07-07-2011, 01:16 PM   #1
bannas12
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Wj Main Bearing/Connecting Rod Torque Specs-4.0

I have been searching the forums and net for the Main Bearing Torque Specs on a 2000 Grand Cherokee 4.0.

What I have found was 33lbs but the motor will not turn over even with using a 3ft cheater pipe. ( I think that is too tight, Tried setting 3 times now)

I just de-glazed the cylinder walls because I had 1 cracked piston skirt and 2 cracked pistons(This is common from what I have read). I am putting a new oil pump in as well. Cylinder walls were fine, I used the 3 stones to de-glaze(some refer it to honing but it's not). I'm Using the old bearings and crank, they are fine with no visual damage.

The 4.7L states 15lbs torque and then a 90 degree turn.

Here is the website for the torque on the 4.0L;
http://jeephorizons.com/tech/99_40l_torque_specs.html

Here is the for 4.7;
Jeep 1999 4.7L Engine Torque Specifications
http://jeephorizons.com/tech/99_47l_torque_specs.html

99-04 should be the same, Info on this would be much appreciated!

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Unread 07-07-2011, 01:39 PM   #2
twinsdaddy
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80 on the mains, 33 on the rods. Just built mine and it should spin over easily with a 12-18" breaker bar.

Did you put the thrust bearing in the right journal? What were your plasti-gauge measurements?
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Unread 07-07-2011, 03:01 PM   #3
bannas12
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I didn't remove the crank, I am using the same one. I will check the measurements for the rod bearings tonight with the plasti-gauage.

The only thing I can thing of is the they are in reverse order. I labeled the bearings as I removed them to make certain they went back onto the same position they came out.
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Unread 07-08-2011, 06:51 AM   #4
twinsdaddy
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possible that maybe you have the rod caps on backwards too? Got me stumped...
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Unread 07-08-2011, 07:06 AM   #5
tsconver
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the two motors are very different. I know most of the bolts on the 4.7 are torque to yield and you replace them everytime you pull it apart. That is what the add 90 degrees to the bolt after you reach torque means.

If you added any additional turn after reaching torque on the 4.0 you will be way over torqued on the 4.0, rod bolts should be 33 ft lbs.
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Unread 07-11-2011, 07:04 AM   #6
bannas12
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thanks for the help guys, turned out I had a couple of the rod caps backwards.
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Unread 07-11-2011, 07:32 AM   #7
twinsdaddy
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Glad you figured it out!
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Unread 08-20-2011, 10:35 AM   #8
remone23
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good day am trying to fine the torque lb for a 2006 grand cherokee connecting rod bearing
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Unread 08-22-2011, 08:55 AM   #9
bannas12
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I wasn't able to pull anything quickly up, but if the 2007 engine is the same here is some info I found on a 3.7L
http://imageshack.us/f/156/jeep37.png/
looks like 27N.m/20Ft LBS.
Here is the post I found the info in;
http://www.jeepforum.com/forum/f67/0...specs-1166356/

good luck!
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