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Re: Main Bearing Help! [Re: chris3] #807972
09/21/10 02:09 PM
09/21/10 02:09 PM
Joined: Aug 2003
Posts: 43,252
Bend,OR USA
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Cab_Burge Offline
I Win
Cab_Burge  Offline
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Joined: Aug 2003
Posts: 43,252
Bend,OR USA
Quote:




Inquiring minds want to know


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Main Bearing Help! [Re: Cab_Burge] #807973
09/21/10 02:37 PM
09/21/10 02:37 PM
Joined: Dec 2007
Posts: 622
NC
chris3 Offline OP
mopar
chris3  Offline OP
mopar

Joined: Dec 2007
Posts: 622
NC
Cab, here is the latest. Carried the crankshaft to a machine shop, I stood and watched the crankshaft be checked, the crankshaft is as straight as any crankshaft can get. Checked the dimensions of the journals and they are all dead on. All of this leaves only one thing and that is something to do with the bearings. Thanks for all of you thoughts and help. We it is actually complete I will let everyone know what happened.

Re: Main Bearing Help! [Re: chris3] #807974
09/23/10 11:53 AM
09/23/10 11:53 AM
Joined: Dec 2007
Posts: 622
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chris3 Offline OP
mopar
chris3  Offline OP
mopar

Joined: Dec 2007
Posts: 622
NC
Up-date. Removed the main bearings. Installed the #1 main cap and torqued. Measured the inside diameter, block and cap. Top to bottom was correct. Side to side was slightly off little tighter. Diagonal measured .005 too tight. #2 cap top to bottom was correct side to side slightly off with a difference,slight to nail touch, at the parting lines of cap to block. Diagonal measurement of too tight. For some reason diagonal dimension of the caps are too tight when torqued.

Re: Main Bearing Help! [Re: chris3] #807975
09/23/10 01:22 PM
09/23/10 01:22 PM
Joined: Aug 2003
Posts: 43,252
Bend,OR USA
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Cab_Burge Offline
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Bend,OR USA
Sounds like it is time for a align hone(not a align bore ) That is a good find Knowlege is the solution to finding the source and cure for problems


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Main Bearing Help! [Re: chris3] #807976
09/23/10 04:31 PM
09/23/10 04:31 PM
Joined: Oct 2003
Posts: 7,506
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Crizila Offline
master
Crizila  Offline
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Joined: Oct 2003
Posts: 7,506
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Quote:

Up-date. Removed the main bearings. Installed the #1 main cap and torqued. Measured the inside diameter, block and cap. Top to bottom was correct. Side to side was slightly off little tighter. Diagonal measured .005 too tight. #2 cap top to bottom was correct side to side slightly off with a difference,slight to nail touch, at the parting lines of cap to block. Diagonal measurement of too tight. For some reason diagonal dimension of the caps are too tight when torqued.


Any ideas on how it got that way?


Fastest 300
Re: Main Bearing Help! [Re: Crizila] #807977
09/23/10 04:47 PM
09/23/10 04:47 PM
Joined: Dec 2007
Posts: 622
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chris3 Offline OP
mopar
chris3  Offline OP
mopar

Joined: Dec 2007
Posts: 622
NC
Have not got a clue what would cause this. I have been measuring, calculating, change and re-checking this block for 2 1/2 weeks trying to get the crankshaft to turn in a block that by all calculations should have had 2 1/2 thousandths clearance. When the crank and mains were first installed and "plasigage" was used it measured 2 1/2 thousandths. Problem is the crankshaft will not turn. Took everything, including the block, to a machine shop this morning. Crankshaft was re-checked, bearings were re-measured and then we go to the block as I said previously when we measured vertically we were back to square one that should have been perfect. Measured horizontally in the block, slightly less clearance, but it still would have clearance and should turn. Measured diagonally and the block was .005 less than the other two directions. Mains do have studs; however, the caps slip down easily and will lock in place with just pressure from the palm of your hand. To clean this up means I need to get 2 1/2 thousandths on each side on the diagonal.

Re: Main Bearing Help! [Re: Cab_Burge] #807978
09/23/10 09:32 PM
09/23/10 09:32 PM
Joined: Jul 2010
Posts: 2,091
Delray beach, Florida
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Performance Only Offline
top fuel
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Joined: Jul 2010
Posts: 2,091
Delray beach, Florida
Quote:

Sounds like it is time for a align hone(not a align bore ) That is a good find Knowlege is the solution to finding the source and cure for problems




what's your reasoning for suggesting that? align boring is the best way to ensure perfectly round bores. if the OP really has .005 too tight diagonally and not .0005, boring would be my first choice. if it's only .0005, honing would be fine.


machine shop owner and engine builder
Re: Main Bearing Help! [Re: Performance Only] #807979
10/11/10 10:31 AM
10/11/10 10:31 AM
Joined: Dec 2007
Posts: 622
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chris3 Offline OP
mopar
chris3  Offline OP
mopar

Joined: Dec 2007
Posts: 622
NC
Want to update and thank eveyone who offered opinions concerning the main caps. The final problem has not yet been determined. I got out another block, everything checked out fine. The new motor is assembled, in the car and cranked yesterday. Leaving Tuesday going to Z-Max and it's first run down the track will be Tuesday night. Thanks again for all of the help from Moparts members.

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