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Farmall & IHC Tractors Discussion Forum
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Super H engine decision

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GeneMO

01-01-2008 09:10:42




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My Super H saga may rival MikeCA's if I continue on like I am.

Just kidding Mike, no one will take your place!

I decided this engine needed more that I was capable of doing. We have a local business that rebuilds engines on a commercial basis. I went by and the do tractor engines. The owner was very nice and said if I would bring it down they would go through it and replace what was needed. They have all the boiling tanks and media blasting equipment. Will also magnaflux. I asked about rebuild kits and he said they have several companies that will guarantee their parts. I asked about US made parts and he said he could not 100% say they were american manufactur any more. He also said if I could find a kit I liked for less, then he would use my parts. Anyway I think I am going to take the whole kit and kaboodle down to him.

What are your suggestions about putting in oversized pistons if I need new ones?

Also about the flywheel, he said some of them he puts in a lathe. I thought someone said on this board NOT to do this, but to have them ground?

Thanks, Gene

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Andy Martin

01-01-2008 13:32:49




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 Re: Super H engine decision in reply to GeneMO, 01-01-2008 09:10:42  
Since you are hiring someone to do the work, you will usually save yourself money by letting them buy the parts. If your parts don't fit, they need to charge you for their time trying.

If the guy is competent and thinks he can turn the flywheel, that is most of what it takes.

If you wnat to get it ground, you should find that service on your own.

If you are replacing sleeves the overbore is typically no more money.

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El Toro

01-01-2008 10:51:48




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 Re: Super H engine decision in reply to GeneMO, 01-01-2008 09:10:42  
You can buy engine overbore kits here on this forum. I would let the engine rebuilder get the engine bearings. If it requires undersize bearings they can get them too. Just click on "engine kits" under "Marketplace". Hal



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MN Scott

01-01-2008 11:38:08




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 Re: Super H engine decision in reply to El Toro, 01-01-2008 10:51:48  
Geez, I can't make any suggestions on here the last few days with out everone jumping all over me. The machine shops around here have a special flywheel grinder machine. It mounts the flywheel on the crank mounting surface so it grinds tru. It is used because of the heat caused hard spots that will cause a lathe to chatter. You can only grind so much from a flywheel before it is a doorstop. Thats why when they are ground they do not remove all the cracks or hard spots, not required. I'am just stating as I see it, I have never seen a tractor flywheel turned on a lathe so if you must batter away on me I can take it and will not go away for stating my opinion!

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Chuck's Repair

01-01-2008 13:47:52




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 Re: Super H engine decision in reply to MN Scott, 01-01-2008 11:38:08  
I agree with you MN Scott.I've had hundreds of flywheels resurfaced both ways durring my years of mechanicing, and a flywheel that has been resurfaced by grinding has a far superior surface than one that has been turned on a lathe.In fack HY-Capacity put out an official statment from their factory that their clutch discs are not to be used with a flywheel that has been resurfaced on a lathe. The only down side about grinding is a stone will not make a square corner.The stone leaves a radius that the pressure plate backing plate will not set completely down on the machined surface.That problem can be overcome by grinding a bevel on the outside bottom edge of the backing plate.

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Wardner

01-01-2008 12:57:12




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 Re: Super H engine decision in reply to MN Scott, 01-01-2008 11:38:08  
As you may have guessed from my previous post, I have cut an IH flywheel on a lathe. SMTA flywheel on my 16" South Bend. Yep, the first cut was terrible due to the spots. I called my automotive machinist friend and he told me to go a little deeper. That took care of the problem. I made a shallow third cut with a rounded tool and the finish was perfect. If I recall, total cut was around .050".

Four cylinder tractor flywheels are rugged. Stepped flywheels are even stronger. I don't care about surface cracks (I had a mess of them) but I don't like leaving the hard spots. They won't wear in and will just rise above the surface again. Gripage can't be very good if the clutch disc only grabs 20% of the flywheel surface.

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El Toro

01-01-2008 12:36:03




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 Re: Super H engine decision in reply to MN Scott, 01-01-2008 11:38:08  
The last flywheel that I had machined was ground and it was smooth as a spanked baby's butt. It's been awhile since I've seen one too. Hal



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gene bender

01-01-2008 12:03:18




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 Re: Super H engine decision in reply to MN Scott, 01-01-2008 11:38:08  
Theres no problem turning a flywheel on a lathe it can be done easy.



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RustyFarmall

01-01-2008 10:26:39




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 Re: Super H engine decision in reply to GeneMO, 01-01-2008 09:10:42  
Truing up a flywheel on a lathe is the only way I know of to do it. The original surface was created by turning it on a lathe, if it was good enough 50 years ago, it will be good enough now. Don't know about the grinding thing. I can't see how a person would ever end up with a flat and true surface.



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MN Scott

01-01-2008 09:33:23




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 Re: Super H engine decision in reply to GeneMO, 01-01-2008 09:10:42  
Sounds like a good idea. He can measure up the parts and some or all may be reuseable. Most kits for the super H have the thinner sleeves for the increased bore. I installed them in my SH I just finshed. They cost the same as stock size, makes no diff except a little more power, your choice. My parts came from Tisco and for the SH they were all made in the USA I think at least the pistons, sleeves and bearings were. As for the flywheel I would have it ground. It gives a nice nodirectional finish for the new disc to seat. I guess I have never heard of anyone around here turning flywheels on a lathe.

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Wardner

01-01-2008 10:47:50




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 Re: Super H engine decision in reply to MN Scott, 01-01-2008 09:33:23  
Just because it is industry standard to grind flywheels does not preclude the use of a lathe to refinish a flywheel. After all, that is how they are made at the factory.

Flywheels tend to develop hard spots. The spots I have seen are dime sized and .025" to .040" deep. There can be as many as 50 or more spots. A grinding wheel is unfazed by the hardened areas. A lathe has to cut below those areas.

It seems to me that a flywheel would be improved by getting rid of the hardened areas. I suspect they are slippery when pressed up against a clutch lining.

This is all IMHO but is something to consider when talking to a flywheel refinisher.

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