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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
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Cockshutt 1755 injection pump question

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Wade B H

11-29-2005 18:14:28




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The engine is gaining fluid (not antifreeze). There is no factory lift pump on this engine, so presume the engine oil is gaining diesel fuel through the injection pump or the injectors. I read on this discussion board that the umbrella seals in the pump could be the cause. I replaced these in Spring '05, but the problem still exists after just 15 hours use this summer. I read on a second discussion board this fall that the two bushings that came with the umbrella seals could be the cause of the diesel leaking into the oil. I chose to not intall the bushings with the umbrella seals because I didn't see the bushings when I pulled the injector pump shaft to replace the umbrella seals.

Do I have to remove the pump to replace the two bushings, or can they be replaced by merely removing the injection pump shaft and working from the front of the injection pump while it is still mounted to the engine? My desire is to not have to re-time the machine and risk future diesel fuel leaks around fittings. Thanks for any contribution on this front.

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J. Schwiebert

11-30-2005 04:06:58




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 Re: Cockshutt 1755 injection pump question in reply to Wade B H, 11-29-2005 18:14:28  
I do not understand the bushings. If I had to change the bushing the whole pump would be off and there would be no insides to the pump.The two seals run in one bushing and that bushing is pressed into the housing and may or may not be the correct size when it is installed. The one fuel shop we used to deal with would check the new bushing and in some cases had to finish hone the bushing to correct the size. Before you say a few choice words, have you had the injectors checked? Do you have any white smoke? Does the engine run up to operating temperature. We had a man with a 1650 (early direct injection)who had the same problem. He used it for short periods of time in the winter and it would slowly gain fuel. His problem was the engine would not warm up enough to burn all the fuel. Timing is not a problem. If for some reason you need to remove the pump align the marks before you pull the pump. Now I will also tell you I have cut one of those seals when I installed it too. I hope I have given you some things to check and think about. Questions?

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Wade B H

11-30-2005 17:14:05




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 Re: Cockshutt 1755 injection pump question in reply to J. Schwiebert, 11-30-2005 04:06:58  
Have not had the injectors checked. Smokes and runs rough at idle, but don't recollect seeing "white" smoke. Runs clean and smooth at PTO speed when warm. The 15 hours were used running the round baler this summer. Engine temperature was well into normal territory. Gained about 1/4 of an inch in the crank case. I don't think the umbrella seals that were installed last winter helped or hindered the problem. What do you think is the next step for idenfying/solving the problem?

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J. Schwiebert

11-30-2005 19:47:38




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 Re: Cockshutt 1755 injection pump question in reply to Wade B H, 11-30-2005 17:14:05  
If you only gained a quarter inch in 15 hours how did you measure it? A normal cut seal will leak a couple of quart easy in a half day of operation. I would do two things. Take the exhaust manifold off and start it. see if any of the exhaust ports are wet. Also while I have the manifold off I would take the injectors out and have them tested.



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Wade B H

12-01-2005 17:18:32




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 Re: Cockshutt 1755 injection pump question in reply to J. Schwiebert, 11-30-2005 19:47:38  
The 1/4 inch was the estimated increase of crankcase fluid on the oil dipstick. Based upon the amount of diesel being added to the crankcase over a 15 hour period, I take it that you suspect that the problem could be either the injectors or a cut umbrella seal. Hence, I presume that replacing the round bushings (that came with the umbrella seals in a kit) in the injector pump will not solve the problem. I will remove the exhaust manifold and look for wet exhaust ports. Should I do that after the engine is warm? If they are dry, are the injectors ok? Thank you.

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J. Schwiebert

12-02-2005 11:18:04




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 Re: Cockshutt 1755 injection pump question in reply to Wade B H, 12-01-2005 17:18:32  
Take the manifold off and start it. I would also get the injectors tested no matter what. Send me an e-mail address and I can discuss it with you.



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Wade B H

12-02-2005 16:00:00




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 Re: Cockshutt 1755 injection pump question in reply to J. Schwiebert, 12-02-2005 11:18:04  
[email protected]



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Wade B H

12-02-2005 15:53:49




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 Re: Cockshutt 1755 injection pump question in reply to J. Schwiebert, 12-02-2005 11:18:04  
Note email.



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