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Farmall & IHC Tractors Discussion Forum
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Rod bearings

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eshoreboy

04-05-2007 18:18:16




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My crank is is worn to where with new stock bearings there is a wiggle in the bearings and the crank. How do i measure this, beacuse i cant with the caps on tight because of the lobes around the caps. Then do i get oversised bearings, i was trying to stay away from getting a new or reground crank. Also when you put the bearings back on do you oil them good? Some one told me to oil them good, then a book said to keep them cleen and free of oil.
Thanks for the help.

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riverbend

04-06-2007 06:40:28




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 Re: Rod bearings in reply to eshoreboy, 04-05-2007 18:18:16  
The crankshaft side of the insert is oiled, the back side must be spotlessly clean and is installed dry.



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El Toro

04-06-2007 03:55:52




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 Re: Rod bearings in reply to eshoreboy, 04-05-2007 18:18:16  
I think you should pull the crankshaft and have a machine shop to measure it and if they decide that it needs to be ground undersize they can furnish the new insert bearings. Hal
PS: Get some help when doing this.



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gots-2-go

04-06-2007 00:04:18




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 Re: Rod bearings in reply to eshoreboy, 04-05-2007 18:18:16  
Ryan,

You need to mic the Journals on the crank, in order to do this the rod caps must be removed.

I have a set of mics and can measure the Journals for you if you want me to.

If you are lucky you may be able to get a set of undersized bearings for it, depending on what the measurments are.

When re-assembling it put STP on the bearings.

My dad always removed the coil wire and turned the engine over until we got a reading on the oil pressure gauge before trying to start it.

Putting in a set of undersized bearings may hold up for some time, it all depends on what you plan to do with the tractor.

If you still plan to use this tractor in pulls you might really want to consider getting the crank re-ground.

Bruce

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RichH

04-05-2007 22:03:35




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 Re: Rod bearings in reply to eshoreboy, 04-05-2007 18:18:16  
Use engine assmbly grease on all contact points when putting the engine back together. Bearings, cam lobes and lifters, etc. Also if you can, 'dip' the pistons in the same oil you plan to use in the engine (not synthitic) just before you put them in the block. During assmbly you can't use to much oil. The oil will desolve the assmbly grease after the engine is running. But the best way if you can is after the engine is together and before you start it is pump oil into the engine lube system.

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tom windsor

04-05-2007 20:02:48




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 Re: Rod bearings in reply to eshoreboy, 04-05-2007 18:18:16  
You are looking for trouble here maybe sooner than later.

The best advice is to take this crank to a machine shop and have them grind it and fit the appropriate bearings. It cost me $80.00 to have a crank ground recently.

As far as oil is concerned, you need a good build up oil throughout the new repairs.



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billde

04-05-2007 19:06:03




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 Re: Rod bearings in reply to eshoreboy, 04-05-2007 18:18:16  
Usually the inserts have marking on the outer perimeter denoting size, std .002 ,010 etc. If you have that much slop, maybe your crank has already been ground. The old inserts should be marked.



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Bob

04-05-2007 18:46:03




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 Re: Rod bearings in reply to eshoreboy, 04-05-2007 18:18:16  
Bearings for worn or reground shafts are sold as "UNDERSIZED"; since the "bore" in the bearings is SMALLER than standard.

If the shaft is worn over a couple of thousandths; you'll have to "bite the bullet" and have it reground; as crankshafts typically wear "eggshaped"; so it's impossible to solve the excessive oil clearance problem simply with "smaller" bearings.



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eshoreboy

04-05-2007 18:40:22




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 Re: Rod bearings in reply to eshoreboy, 04-05-2007 18:18:16  
Thanks, but i think i will get it from a store neer here, so will it hold up for a good while?
And it goes between the bearing and crank right?



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Tan67

04-05-2007 18:45:04




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 Re: Rod bearings in reply to eshoreboy, 04-05-2007 18:40:22  
right but make sure you have a reliable torqe wrench. I coudnt tell you if it woudle hold up or not. you would just have to plasti gauge it and check the clearences in your repair and overhaul manual.



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Tan67

04-05-2007 18:34:21




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 Re: Rod bearings in reply to eshoreboy, 04-05-2007 18:18:16  
I forgot to answer you last question yes oil them good with a type of oil from clevit 77 or something i have some if you want it



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Tan67

04-05-2007 18:31:48




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 Re: Rod bearings in reply to eshoreboy, 04-05-2007 18:18:16  
they make a thing called PLAST-I-GAUGE. Its a little plastic string that you put between the crank and and rod cap with the baering and tourqe it to the spec. The wider the string gets the better it will have a scale on the side of the package that it comes in showing how many thousents claerence you have to play with just lay it aginst the pagage scale to measure. the best place to get it would be NAPA or any store that carries CLEVITE 77 parts witch is about the best out ther witch wont run you but about $1 ot $2 for it. it dont take much. I have some if you want it free of charge just out ther laying in my garage. if so send an e-mail.thanks.

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Jossette

04-05-2007 18:30:22




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 Re: Rod bearings in reply to eshoreboy, 04-05-2007 18:18:16  
going to have to get it ground down or put double the money in it later, or should I say sooner...



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