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Case Tractors Discussion Forum
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SC Compression

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Rockcricker

11-03-2006 14:12:02




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I have a 48 Case SC with very little compression. All four are the same. I have had the head redone and new rings put on. What could it be?




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Rockcricker

11-07-2006 20:06:11




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 Re: SC Compression in reply to Rockcricker, 11-03-2006 14:12:02  
Well we finally found out what the problem was. The Manifold. There was a hole inbetween the exhaust and intake. Who would of know?



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Doc Larry

11-08-2006 05:39:32




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 Re: SC Compression in reply to Rockcricker, 11-07-2006 20:06:11  
That would do it. Thanks for the update.

Larry



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Doc Larry

11-05-2006 06:10:01




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 Re: SC Compression in reply to Rockcricker, 11-03-2006 14:12:02  
In addition to what Walt has below on honing, you also need to remove the ridge at the top of the cylinder with a ridge cutter. You need to take a single new ring, put it in each cylinder, and measure the end gap. You need to measure the cylinder taper (diameter at top versus diameter at bottom. With the rings in the pistons, you need to measure the side gap between each ring and the piston. You need to measure the distance between the piston and the cylinder wall near the top of the cylinder where wear is the greatest. You also need to make sure you had the rings installed correctly (right side up). If all of the above measurements are within factory specs, and the cylinders are honed, and the valves are seating correctly, you should have factory compression after the rings have time to seat. If some of those specs are outside of factory, you will probably have below normal compression. But this is an old tractor - you could put a lot of time and money into making it run like a young pup.


Having said all that, if the compression will blow your finger off the spark plug hole and your gauge doesn't show anything, you need to throw the gauge away and check the compression with another one. Before you take anything back apart.....

Good luck

Larry

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Rockcricker

11-04-2006 16:50:20




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 Re: SC Compression in reply to Doc Larry, 11-05-2006 06:10:01  
Where would I get the spec's for that? It isn't stock it has 3 5/8 pistons in it. Thanks for your help.



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Doc Larry

11-04-2006 19:24:34




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 Re: SC Compression in reply to Rockcricker, 11-04-2006 16:50:20  
If the pistons are Case the clearances and specification limits for the rings should be the same. If they are after market the maker should give them to you. Specs for cylinder taper and out of round should be in the Case service manual, but I don't have one for the SC. Maybe someone else will provide that.

Were you able to try a different compression gauge?

Larry



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Walty Davies

11-04-2006 22:31:47




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 Re: SC Compression in reply to Rockcricker, 11-03-2006 14:12:02  
You need to start all over remove head and pistons. Then go to NAPA and get a cylinder hone ( a good one not a cheap one). Use a Half in. varible speed drill set to the slowest speed to hone the cylinders. Move the hone up and down to show a cross hatch pattern on the walls. I use Kerosene to lubricate and clean the hone. Thoughly clean the Hones between each cylinder. The clean hone should sound like it is grinding when its working properly and clean and has enough kerosene to keep them clean while cutting. Have someone spray the kerosene on the hone as you run it.
You should have some where around 80 to 85 PSI if stock 90 to 110 if 8 to 1 compression over that and you will need to run Aviation fuel. Walt

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Rockcricker

11-06-2006 08:48:56




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 Re: SC Compression in reply to Walty Davies, 11-04-2006 22:31:47  
Well tried a third gauge and it read between 75 and 80. We think it is not sucking up any gas. Going to ck carb out. It was rebuilt but going to reck it.



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Doc Larry

11-04-2006 19:07:19




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 Re: SC Compression in reply to Rockcricker, 11-03-2006 14:12:02  
Please tell us more...

What exactly is your compression?

What did you do to the cylinders before putting in the rings?

Larry



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Rockcricker

11-04-2006 20:24:38




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 Re: SC Compression in reply to Doc Larry, 11-04-2006 19:07:19  
There is enough to blow your finger off the sparkplug hole but does not show up on gauge. Tried two. I just cleaned the cylinders before putting on the rings.



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Walt Davies

11-03-2006 23:11:39




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 Re: SC Compression in reply to Rockcricker, 11-03-2006 14:12:02  
You have to remember that these old tractors were built when gas was 65 octane. So 5 to 1 or 6 to 1 would be pretty high compression for them. We now have gasoline in the upper 80s and low 90s so we can get 8 to 1 or 8.5 to 1 compression and they will run good.

Walt Davies



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L.Lamp

11-03-2006 20:06:38




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 Re: SC Compression in reply to Rockcricker, 11-03-2006 14:12:02  
I have one that has the same symptoms. I put in new valves and guides and new rings. It has considerable blowby for having new rings. It is a stock 3 1/2" bore with cast iron pistons. This is the only Case engine that has not met my expectations. The oil pressure is poor too. It is all painted and now I am considering tearing it down again and boring the sleeves to 3 5/8". I bought the crankshaft and main bearings from a guy who said they came from the same engine. When I put them in, they had a clearance a cat could crowl through. I used another set of used mains, but they are too loose or the oil pump isn't putting out enough pressure. It sits in a corner of the garage because it would be too embarrassing to take it anywhere.

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