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Farmall & IHC Tractors Discussion Forum
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Got the head off and now....

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Andrew Z

10-04-2005 07:20:43




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I got the head off the 100 and the pistons and sleves are a mess it looks like they have been sitting in water for about 20 years or so!! all kinds of rust and water. So I need a kit. The question that I have is should I put the 3 1/4" steeped pistions in or stay with the stock?? Does puttig in the bigger pistons require any type of machineing? Will the bigger pistons have any notacible power diffrence? I plan I using it for pulling.

Thanks Andrew

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Hobo,NC

10-04-2005 10:41:23




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 Re: Got the head off and now.... in reply to Andrew Z, 10-04-2005 07:20:43  
Go with the 3 1/4 kit and look fer a 140 head it izz 'bout haft the CC of a 100 head and will boost yer compression. A 140 cam will get ya a few more HP but you also will have to turn it a few hundred RPM more to git it. the 140 head & cam izz a direct bolt on. the push rods may be shorter for the 140 head, I don't remember. stay around 26 to 28 degree total advance on the dist and spark knock will not be a issue. I have one set up this way and its more power than it needs. I also have a used 100 head, valve and guides are worn out. I had a 140 engine with a cracked block and used the head, cam, gov,timming cover, cam and crank gears. Wuz gonna use the crank but the crank pulley for the 140 uses a smaller belt than the 100. This wuz a 123 engine. When you assemble the lower end spray soapy water around the rear seal and blow compressed air around the inside of the crank seal aera and check fer leaks. I use gray silicon on to seal up the rear seal covers and also on the timming cover, I have not had much luck with gaskets only seems all I git hold of the covers a warped up and leak.

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Shaggy

10-04-2005 11:46:47




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 Re: Got the head off and now.... in reply to Hobo,NC, 10-04-2005 10:41:23  
I have a 140 head on my 1940 B (still crank start)with a 3 1/8 stepped head pistons. Its a little stout to crank but it runs great. The push rods are the same.
Shaggy



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El Toro

10-04-2005 09:47:47




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 Re: Got the head off and now.... in reply to Andrew Z, 10-04-2005 07:20:43  
Any problem getting the head off? If that head is rusted through I think I would look for a good used head that's been magna-fluxed or is guaranteed not to be cracked. Sleeve and piston
kits are available from ytmag. If not try jebm@threeriver.net. You should measure that
crankshaft or have it measured by your local auto
machine shop. It may need to be polished or ground undersize and cleaned good too. That should include the block too. Hal

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Andrew Z

10-04-2005 13:36:39




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 Re: Got the head off and now.... in reply to El Toro, 10-04-2005 09:47:47  
The head came off after working the heck out of it with a putty knife. The head is all full of rust and what not. I going to bring the head down to the machine shop early next week to have it checked. If its beyond repair what are the avablity of used heads and what do they go for. Thanks Andrew



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El Toro

10-04-2005 14:47:11




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 Re: Got the head off and now.... in reply to Andrew Z, 10-04-2005 13:36:39  
Here's a website for salvageyards, there's 16 pages of them you should be able to find a head. Hal

http://www.epartdirect.com/index.php?t=fc&s=s



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Andrew Z

10-04-2005 13:35:09




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 Re: Got the head off and now.... in reply to El Toro, 10-04-2005 09:47:47  
The head came off after working the heck out of it with a putty knife. The head is all full of rust and what not. I going to bring the head down to the machine shop early next week to have it checked. If its beyond repair what are the avablity of used heads and what do they go for. Thanks Andrew



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Red Dave

10-04-2005 07:32:21




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 Re: Got the head off and now.... in reply to Andrew Z, 10-04-2005 07:20:43  
You should be able to go with the oversize pistons with a sleeve/piston kit and no machining. You would replace the pistons and sleeves. Stepped pistons would increase the compression ratio.
Both would tend to improve power, but I don't know a horsepower number to tell you.

Seems to me that most people do one or both when rebuilding. If you want to pull with it you'll need all you can get.



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