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Farmall & IHC Tractors Discussion Forum
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.002 over Rod Bearings?

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Wild Horses

05-17-2004 10:33:27




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We punched the pistons out a buddy's M to re-ring it yesterday. The rod bearings were a little scatched and pitted so we were going to put new ones in. But the bearings do not have a STD or other oversizing stamped into them. There is an 002. One of the guys said he thought he'd heard of .002 over bearings. Was something like this available? I assume it would be done to increase oil pressure over a standard bearing without turning the crank.

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Bruce Wa.

05-18-2004 09:40:38




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 Re: .002 over Rod Bearings? in reply to Wild Horses, 05-17-2004 10:33:27  
put .002 under rod bearings in my H years ago. Brought up the oil pressure and I've had no problems



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Allan

05-18-2004 03:34:33




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 Re: .002 over Rod Bearings? in reply to Wild Horses, 05-17-2004 10:33:27  
Wild,

I watched a guy throw in a set of .002" undersize bearings one time to "take up the slack". He didn't measure the journals; he just put 'em in.

That engine lasted just 16 minutes before it spun & ruined the crank.

Since then, I've made it a practice to measure every journal on every overhaul and to always set the clearance at .0015" to .003"; preferably at the low end.

Allan



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49 Cubber!

05-17-2004 13:07:28




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 Re: .002 over Rod Bearings? in reply to Wild Horses, 05-17-2004 10:33:27  
Must be confusing huh?.002 bearing are available,but the reason for those bearing was to have a cheap way to repalce the bearings.Most all cranks I have pulled,with some exceptions being those that had been turned previuosly were all .002 too small,just from wear.Put in a set of those bearing in and you shouldnt have to turn the crank.If you have gone this far with it,I just get the crank turned.Bearing are avaiable .020 up to .040,not .002 to .004 as mentioned,I think thats was on mains on the .040.

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aCES

05-17-2004 12:41:38




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 Re: .002 over Rod Bearings? in reply to Wild Horses, 05-17-2004 10:33:27  
Wild HOrse that 002 is the size of the bearing all right but it is ubder size not over size refering to the size of the shaft not the size of the bearing, because the shaft get's smaller not bigger. Be sure to tape the new bearings to make sure they are not to tight, should have from .002 to .0035.



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Mark in Mi

05-17-2004 11:02:42




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 Re: .002 over Rod Bearings? in reply to Wild Horses, 05-17-2004 10:33:27  
Yes, there were .002 oversize bearings. Both for Rod and Main bearings. I think the largest oversize bearings for rods are .003 and the largest for mains is .004 but I might be wrong. I put .002 oversize main bearings in my H to correct low oil pressure. It did the trick.



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Bob

05-17-2004 20:56:49




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 Re: Re: .002 over Rod Bearings? in reply to Mark in Mi, 05-17-2004 11:02:42  
The term is UNDERSIZE.

Pistons for enlarged bores are OVERSIZE.

Bearings for worn or reground cranks are UNDERSIZE.



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