Re: Cam bearing failure 440/6 (repost)
[Re: JohnRR]
#1321336
10/16/12 01:19 PM
10/16/12 01:19 PM
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Joined: Jan 2003
Posts: 16,376
dogdays
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,376
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This whole concept of "outer race" is incorrect. There are only two parts to a journal bearing, the journal and the bearing. In the case of a cam bearing the bearing is called a bearing insert or shell. Machining down the OD of the bearing insert is impossible. Period. JohnRR is right, fix the cam bores in the block. This is not a big problem, and seems to affect certain engine families more than others. B/RB engines are one of the families that is affected. Deal with it. R.
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Re: Cam bearing failure 440/6 (repost)
[Re: BIGSTROKER]
#1321339
10/17/12 03:29 AM
10/17/12 03:29 AM
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Joined: Jan 2007
Posts: 1,668 Mi,U.S.A.
mike s
top fuel
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top fuel
Joined: Jan 2007
Posts: 1,668
Mi,U.S.A.
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Very common problem.I find that maybe 1 in 5 will work without some scraping etc.Sometimes you can press one in and it will be tight remove it and put another in and its ok.One thing that helps is to use a babbit cam bearing.They are the ones that are pressed into a circle and have a seem that you can see on the back side.Factory bearings were of that design.They conform to the block better than the seemless Durabond type bearing.I use an old cam (check straightness) that has a groove ground across each journal.Short of align boring the bearings after they are installed it is the most accurate and easiest way to fix this problem.
One more item that helps is the tool that is used.The Kent-Moore style with the solid rubber sleeves works better that the old style Lisle tool with the o-rings.This is what most shops use.The new Lisle tool has been updated to the solid sleeves style.
Lastly, always install the front bearing from the rear of the block.
Leave the gun.......take the Cannoli's....Mike
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Re: Cam bearing failure 440/6 (repost)
[Re: mike s]
#1321340
10/18/12 08:05 PM
10/18/12 08:05 PM
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Joined: Jun 2004
Posts: 3,319 Chicago Burbs
sthemi
master
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master
Joined: Jun 2004
Posts: 3,319
Chicago Burbs
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Not just a problem with seasoned blocks, my new MP block had the same problem, The very experienced machinist insisted I bring a used cam with, to check the fit when the new bearings were installed and it was too tight.. a few minutes with a machinists knife and all was good... A friend found out the hard way that a too tight cam is not going to fly, after he broke the dowel pin in the cam shaft try to turn the motor over after his machine shop guy machined the block, and installed cam bearings..
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Re: Cam bearing failure 440/6 (repost)
[Re: Four40mopar]
#1321343
11/02/12 10:23 PM
11/02/12 10:23 PM
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Joined: Aug 2003
Posts: 43,307 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,307
Bend,OR USA
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Quote:
I had to refresh this issue, I am currently building a 68 440 with this issue. Does anyone out there know a turning torque spec. for the camshaft alone. Mine is 15-20 inch pounds, seems a little tight to me.
Probally not a inch lb. spec. out there, if it feels to tight to you now get some scotchbrite and clearance it until you like the way the cam turns, unlike girls, a little loose is better than to tight
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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