Re: Main Bearing Help!
[Re: snook]
#807954
09/19/10 12:57 PM
09/19/10 12:57 PM
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Joined: Jan 2005
Posts: 12,419 Kalispell Mt.
HotRodDave
I Live Here
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I Live Here
Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
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If your crakn has chamfers and the bearings are too wide they could be hitting the edge of the curve and locking it up.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: Main Bearing Help!
[Re: Cab_Burge]
#807957
09/19/10 04:31 PM
09/19/10 04:31 PM
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Joined: Dec 2007
Posts: 622 NC
chris3
OP
mopar
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OP
mopar
Joined: Dec 2007
Posts: 622
NC
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More news. The bearing are set back such that the edges are not hitting the champher on the crankshaft. Set the crank shaft in place turns free. Took the crank back out removed the center thrust bearing. Set the crank back in place. Checked end play with the shaft in place on the bearings and would move laterally and turn smooth. Put all of the caps on. Torqued the studs to 15 foot pound and the crank would not turn. Took each cap off, one at a time, and crack would not turn until the last cap was removed. This crank has been checked for straight, the journals turn .010, polished and balanced. Only possible thought at this point is that the caps are not aligning with the crankshaft. Thanks MOPART for all of your help. Anyone else got any ideas.
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Re: Main Bearing Help!
[Re: chris3]
#807958
09/19/10 08:19 PM
09/19/10 08:19 PM
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Joined: Dec 2007
Posts: 622 NC
chris3
OP
mopar
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OP
mopar
Joined: Dec 2007
Posts: 622
NC
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Re: Main Bearing Help!
[Re: chris3]
#807962
09/19/10 11:52 PM
09/19/10 11:52 PM
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Joined: Aug 2003
Posts: 43,251 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,251
Bend,OR USA
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There is only a cuople of reasons the crank won't turn, there's not enough clearnances on either the main bearings or the thrust clearnance or the crank is bent I would start at the front of the block and tighten #1 main cap down at a time and see if the crank will rotate, if not remove it and do #2 and then # 3 and so on. If the crank won't turn with any of the caps tight you may have a main web bore needing align honing or align boring as a result of the block being out of alignment on the mains. Over heating the block can cause this, usually the main caps will not have any inteference fit in the block if that happens Do your main caps fit loosely or do you have to tap them into place or use the bolts to make them fit into the main saddles ? BTW, when it comes to assembling and blueprinting motors everything has to be checked, every machine shop and machinest as well as mechanics makes mistakes, it is the engine assemblers job to find the mistakes and get them corrected before the motor is ran the first time your being tested on this one, you can and will figure it out Let us know what you find and what it takes to fix it
Last edited by Cab_Burge; 09/19/10 11:56 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Main Bearing Help!
[Re: chris3]
#807964
09/20/10 10:42 AM
09/20/10 10:42 AM
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Joined: Jul 2010
Posts: 2,091 Delray beach, Florida
Performance Only
top fuel
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top fuel
Joined: Jul 2010
Posts: 2,091
Delray beach, Florida
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put the crank in the block and torque main caps 1,2,4 and 5 install #3 cap without the lower shell and torque it. see if the crank spins freely. i'm guessing it will.
machine shop owner and engine builder
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Re: Main Bearing Help!
[Re: Performance Only]
#807965
09/20/10 10:53 AM
09/20/10 10:53 AM
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Joined: Oct 2003
Posts: 7,506 Az
Crizila
master
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master
Joined: Oct 2003
Posts: 7,506
Az
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Dumb question at this point, but did you mike the bearing shells to make sure they are actually 10 over?
Fastest 300
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Re: Main Bearing Help!
[Re: Crizila]
#807967
09/20/10 11:23 AM
09/20/10 11:23 AM
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Joined: Oct 2006
Posts: 4,765
quick77rt
Parts Problem
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Parts Problem
Joined: Oct 2006
Posts: 4,765
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A long shot? Has the block ever been align bored? If so you might check the bearing tangs to see if they are now too big to let the bearing sit right in the block. I had the no turn problem, I made it turn, pulled the crank, seen the two areas it was tight, used a small file on the bearing half just a bit, installed the crank with no further issues.
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Re: Main Bearing Help!
[Re: chris3]
#807969
09/20/10 01:39 PM
09/20/10 01:39 PM
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Joined: Jun 2009
Posts: 438 Great Lakes Region
abodiesonly1
mopar
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mopar
Joined: Jun 2009
Posts: 438
Great Lakes Region
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Quote:
The main caps do not just sit down in the block. You have to give them just a slight tap and they will go in place.
With no main caps installed the crank will turn free. I installed the #1 cap, torqued it down and the crank would not turn. Took that cap off and installed the #2 cap and it would not turn. Did this to every single cap and the crank would not turn. Crank will not turn with any cap in place.
Removed the #3 main thrust bearing and cap. Set the crank in place. Crank will turn free. Install #1 cap and torque it down and the crank will not turn.
I will check the run out on the crankshaft tonight; however, I believe that I will have to have this motor align honed to get this right.
Yes we will get it fix; however, it has cost us another week-end. If we had not already spent so much money on this block, I would have set it aside and worked on another. Thanks for all of the help MOPARTS and if anyone has any ideas please let me know.
With the crank in place, and only 1 cap installed and torqued, it has to be a bearing problem.
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Re: Main Bearing Help!
[Re: chris3]
#807971
09/21/10 09:14 AM
09/21/10 09:14 AM
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Joined: Dec 2007
Posts: 622 NC
chris3
OP
mopar
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OP
mopar
Joined: Dec 2007
Posts: 622
NC
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