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DPA Pump reseal

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11-11-2016 14:08:42

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I'm in the process of re-sealing my Lucas DPA injector pump on my 4000. Have it torn down and in the ultrasonic cleaner.
My question is: can the drive bushing be replaced in the case? I can see from the inside where it can be driven out but have not found a replacement bushing online.

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11-11-2016 14:38:52

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 Re: DPA Pump reseal in reply to JTWAT, 11-11-2016 14:08:42  
That application has no replaceable bushing, drive hub rides directly in the aluminum housing..

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11-11-2016 15:02:30

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 Re: DPA Pump reseal in reply to Dieseltech, 11-11-2016 14:38:52  
You are correct. I just removed the case from the cleaner and see that. It was brown before cleaning and looked like dirty bronze.
Any idea what a case costs? Or how much play is acceptable?

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11-11-2016 17:26:44

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 Re: DPA Pump reseal in reply to JTWAT, 11-11-2016 15:02:30  
Hub end play should be .010 inch or less, never have seen the bore wear bad enough to need replaced. End play wear is more common.

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11-11-2016 20:12:51

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 Re: DPA Pump reseal in reply to Dieseltech, 11-11-2016 17:26:44  
Thanks, what type and size of tubing do you use for the fuel return tubes between the injectors and fuel tank?

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11-12-2016 05:12:24

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 Re: DPA Pump reseal in reply to JTWAT, 11-11-2016 20:12:51  
Been awhile, but the last time those were needed just got the complete line and fitting assembly from New Holland.

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11-13-2016 12:57:20

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 Re: DPA Pump reseal in reply to Dieseltech, 11-12-2016 05:12:24  
Have everything clean and reassembling. I have a question concerning the transfer pump piston.
My book shows a o-ring on it where is seats in the valve. When I removed it for cleaning there was a red fiber washer stuck to it.
I don't see any washer or o-ring in my kit that fits the plunger. Is this seal needed or will it seal good enough without one?

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11-13-2016 14:07:50

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 Re: DPA Pump reseal in reply to JTWAT, 11-13-2016 12:57:20  
If you mean the transfer pressure sleeve, piston and spring assembly there's no O ring used. The sleeve does use a small gasket to seal the lower shoulder inside the end cap.

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