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Unread 05-22-2012, 11:17 PM   #1
325issguy
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Join Date: May 2012
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Bedplate torque questions

Hi everyone,
Im assembling a 4.7 from a 99. Having troubles for some reason. My machine shop told me that their torque specs for the inner bolts are 25ft lbs + 90.

As well as I have heard of multiple people tightening to that spec. However, when I tighten to 25ft lbs it spins, but the extra 90 makes it too tight to spin. The weird thing is that the bearing clearances tightened to that torque are .0015.

So my question is should i use the new rod bolts i have coming and torque to 25in lbs + 90 or should i take the block back to machine shop and have it checked and assemble at the torque that seems correct 25 ft lbs.

Thanks,
Chris

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Unread 05-22-2012, 11:34 PM   #2
1986cj
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Are you tighting them to 25ft lbs and then to 90 ft lbs?, Or to 25ft lbs and the a 1/4 trun? Check this out http://www.enginebuildermag.com/Arti...ysler_47l.aspx
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Unread 05-23-2012, 12:02 AM   #3
325issguy
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Yea im doing 25 ft lbs then 1/4 turn. I can do them all to 1/8 turn it seems then she locks up as soon as I tighten the last 1/8. So it is verified that you should tighten the inner bolts to 25 ft lbs instead of inch lbs?
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Unread 05-23-2012, 02:27 AM   #4
wgirvine
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The referenced enginebuilder article said 25 INCH-pounds, but that is probably a typo. I can't imagine 25 in/lb + a quarter turn would be enough for main bearings.

But here is one idea: how are you supporting the engine? Is it bolted to an engine stand by the flywheel end? The block might be sagging. Try taking it off the stand and setting it on the workbench, then torque the bolts. I know it sounds crazy, but I once had the same problem with a Mercedes inline-6 block. Block was bolted to the stand, crank would turn just fine until the main caps were torqued. Then it was locked up solid. Took block off the stand, set it on the bench, torqued the main bolts and everything was fine. Yes, cast iron will bend...
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Unread 05-23-2012, 04:49 AM   #5
325issguy
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Thanks man,
Now that I think of it that is alot of weight sagging down on the engine.
Thanks I will give that a try!
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Unread 06-03-2012, 12:18 PM   #6
325issguy
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Well it still binds up when on the bench. Just got some telescoping gauges and a micrometer set so I am heading out there in a bit to take some measurements and see if everything checks out.
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