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Farmall & IHC Tractors Discussion Forum
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super a engine bearings

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werowance

12-29-2005 06:17:57




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i was wondering before i started tearing down the engine, is it possible to change rod and main bearings without removing the crank? my oil preasure gets real low after about 30 mins of running. i dont want to have to split the tractor if i can get by without it, and realy dont want to turn the crank. any sugestions, hints, tips, or tricks for me?

thanks in advance




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scott#2

12-29-2005 16:35:34




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 Re: super a engine bearings in reply to werowance, 12-29-2005 06:17:57  
I just redid a pump on a SA. Here are the steps, kind-of.

scott#2



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scott#2

12-29-2005 16:43:25




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 Re: super a engine bearings in reply to scott#2, 12-29-2005 16:35:34  
Sorry, forgot to paste. I really didnt want to go there but I just couldn't help myself. The pump is now within spec at all locations, (gear backlash, right at the limit)nice having a machine shop around. Milled the body flange, surface ground the cover plate, measured all tolerances .0035 gear to cover clearance, .005" running clearance (gear to housing side) This should be a real good test. At least if I have low pressure on this SA, I know it wont be the pump. Took me just about as long to find the $$#@$$#@&* cotter pin for the screen. After tearing the place apart, I finally found it stuck to one of the magnetic indicator bases...figures. Thanks for the numbers. Oh by the way, those 2 gaskets are of different thickness.
scott#2

Gear backlash is another thing to consider. Mine was at the limit so I let it go believing that most pressure is created through small clearance between the gear faces and the cover plate. The less the clearance, the more pressure the gears can create to pump the oil.

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Hugh MacKay

12-29-2005 13:11:25




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 Re: super a engine bearings in reply to werowance, 12-29-2005 06:17:57  
If I were you, I would first look at the oil pump. On a Super A it could well be your only problem. I'm not right up on telling you how to do this. Why don't you repost your question asking how to rebuild the oil pump, state the symptoms again as well. There are a number of guys on here that have experience with this.



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captaink

12-29-2005 07:30:37




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 Re: super a engine bearings in reply to werowance, 12-29-2005 06:17:57  
If you pull the pan, check the gasket in the oil pump. My B blew one out and oil pressure was dismal at best.

As others posted, measure the crank. If you put standard bearings on a crank that is 0.015 undersized, you won’t be happy when you get it back together.



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El Toro

12-29-2005 06:45:47




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 Re: super a engine bearings in reply to werowance, 12-29-2005 06:17:57  
My manual says you can change both. I really think that shaft should be measured for wear so you can determine if undersize bearings are required. I would check the oil pump too for wear. Those tractors are easy to split. Hal



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werwowance

12-29-2005 07:50:08




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 Re: super a engine bearings in reply to El Toro, 12-29-2005 06:45:47  
so, it is possible to change without pulling crank. can the crank be measured with it in, just caps off? im wondering if there is enough room to get a mike measurement without dropping it. i just hate realigning the clutch pilot, dropping my belly mower pulling front seals and every thing off.

also what is spec size for mains and rods on that crank, and if it hasnt been truned down but is worn enough should i use a over size bearing?

thanks

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El Toro

12-30-2005 09:58:47




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 Re: super a engine bearings in reply to werwowance, 12-29-2005 07:50:08  
I have breakdown of the oil pump on a Super C and I think it's probably the same pump as used on the Super A. It has the part numbers too. I can email you a copy if you want it. Hal from MD



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El Toro

12-29-2005 08:17:33




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 Re: super a engine bearings in reply to werwowance, 12-29-2005 07:50:08  
You should be able to measure the rod journals, but I don't think the mains can be measured. It should be measured to see if has become egg-shaped.

The crankshaft specs are 2.1245" on the mains and 1.7495" on the rods. Hal



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werowance

12-29-2005 08:27:56




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 Re: super a engine bearings in reply to El Toro, 12-29-2005 08:17:33  
ok, thanks, are most over sized bearings stamped? and if i go ahead and asume that they are standard, then plastigage it when i put the new ones in would that be fine? if the crank had been turned down, and i used standards then the plastigage would definately show it?

also thanks for the very fast replies.



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El Toro

12-29-2005 09:49:33




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 Re: super a engine bearings in reply to werowance, 12-29-2005 08:27:56  
Most bearing inserts are stamped whether they're
std or undersize. If not std should have .001, .002 & some may have .003 same if the shaft has been ground would have .010 on the insert down to .030". You can use plasti-gage,
it won't tell you if the shaft is egg-shaped. You can use that with a new insert and see how much clearance you have. For a close tolerance you should have a clearance of .001" to .0015".
You can run close tolerances on these engines since they're are pressure lubricated. The engines that have dippers need more clearance. Hal

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