JD 1020 leaking diesel from the fuel injection pump

dancindog · Mar 25, 2015

Have a 1968 (Mannheim built) JD 1020 leaking diesel from the fuel injection pump, which is a CAV Roto Diesel (DPA/model#? R3432190 E, serial# 2305 P1). Someone told me i could replace the copper washers on the fuel lines to stop the leak. From what i've read online these crush washers work with a banjo fuel line fitting to seal the connection. I don't have any diesel experience and these terms are new to me so please correct me if i don't have this right.

Anyway, i'm not convinced this is the problem. Leak is just a few drips when engine is cold, after a couple of hours in 80 degree weather it becomes a trickle (and i shut her down).

A pic of the pump is attached, which has labels pointing out four leak/drip sources i can identify. An 11 second video of the leak can be seen here:

https://youtu.be/Em-Q7zIKquM

Hope you gurus can tell me what the problem really is and recommend best fix.

Thanks very much,
Richard

Bob · Mar 25, 2015

The banjo fitting leak should be easy to fix... there's STEEL washers on either side. Thoroughly clean the area, remove the bolt, clean the mounting face, the fitting, and the bolt with a shot of carburetor cleaner, replace the washers, and tighten the bolt.

The other leaks are at the advance mechanism, and lieklt "O" rings that need to be replaced.

Dieseltech · Mar 26, 2015

If the hydraulic head O ring is leaking it's best to reseal the complete pump for best results. Over time the seals get hard and brittle, and the leaks start showing up. Just got a pump from an Oliver with the same issues..

cannonball · Mar 26, 2015

Put you some chain saw gas mix OIL in the diesel tank....or outboard oil mix

Kent Petersen · Mar 26, 2015

What makes you think that will helps anything gas must be good for a diesel. not

dancindog · Mar 26, 2015

Based on what Bob and Dieseltech have said, i believe some or possibly all the O rings need to be or should be replaced. And the crush washers/banjo fittings are no biggie, as Bob said.

I've read many threads on this topic on several different sites, with some people implying it's no big deal to work on a pump yourself and others insisting it can only be done successfully in a "clean room" by a trained specialist with special tools and equipment.

Given that i am very mechanically inclined but have no special tools or equipment and not even a clean workbench, what do you recommend? Is it worth doing myself or is it better to save time and grief by sending it out to have it done right?

Many thanks, i appreciate your opinions!

Tx Jim · Mar 27, 2015

A clean environment is important so that no dirt is induced in inj pump but there has been posters on this site that stated they repaired inj pumps in the field using pickup tailgate for a workbench.

If a repair shop correctly rebuilds an inj pump they will install it on a pump test stand to adjust pump and check pressure.

cannonball · Mar 27, 2015

what do you think the oil does for a gas????????? stopped 2 of my pumps from leaking

JD 1020 leaking diesel from the fuel injection pump

dancindog

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Bob

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Dieseltech

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cannonball

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Kent Petersen

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dancindog

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Tx Jim

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cannonball

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