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Case Tractors Discussion Forum
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Case 800 Diesel with a miss

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dbock

08-21-2005 17:46:16




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We just rebuilt the injection pump and the fuel injectors in my case 800. Now, it will start right up, but it is missing on #2 and #4 cylinders. If you let it run for awhile the manifold will heat up on 1 and 3, but you can touch 2 and 4. We took the heads off thinking it was an exhaust valve, but every thing looked ok. I thought it might need rings, but there is no blow by in coming out the dip stick. I wouldn"t think it would be the timing because it starts fine without ether. Any ideas?

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caseman-d

08-22-2005 09:10:30




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 Re: Case 800 Diesel with a miss in reply to dbock, 08-21-2005 17:46:16  
Had similuar problem with my 800. I took my bad ones and took them to local local diesel injector place. They cleaned them up good and tested them. Price wasn't to bad and was money well spent.
caseman-d



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John Saeli

08-21-2005 17:54:52




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 Re: Case 800 Diesel with a miss in reply to dbock, 08-21-2005 17:46:16  
It could be a number of things. Valves might look OK, but the Recess Depth needs to be checked. Did you do a Compression Check? That would be a starting point. Could be weak Valve Springs. Could be a problem with the Power Cells.



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dbock

08-21-2005 18:55:06




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 Re: Case 800 Diesel with a miss in reply to John Saeli, 08-21-2005 17:54:52  
Since I have the heads off, I am going to have someone look at them. We didn't do a compression check because we didn't have the right fittings to do it, but I wish we would have. I thought about it being the powercells, so we took them out and cleaned it up, but it really didn't help.



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Doc Larry

08-21-2005 19:48:02




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 Re: Case 800 Diesel with a miss in reply to dbock, 08-21-2005 18:55:06  
Were you scrupulously clean when installing the injectors, lines, etc.? I"d be inclined to have the spray pattern checked on the injectors from the two missing cylinders, or swap the injectors around. Doing so will tell you for certain if the problem is mechanical or fuel related.

Larry



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dbock

08-22-2005 20:03:24




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 Re: Case 800 Diesel with a miss in reply to Doc Larry, 08-21-2005 19:48:02  
We swapped the injectors, but it still was missing on 2 and 4. I guess since I have it torn down this far, I will go ahead and put new rings on and rod bearings. Thanks for all the help and good ideas.



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