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John Deere Tractors Discussion Forum
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Re: 2940 engine mystery

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11-20-2013 05:46:48

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You can buy brand new pencil injectors for $30 each, more-or-less. I cannot come up with a valid reason to mess with used injectors that are cleaned up and sold as "rebuilt."

A bad injector can cause one heck of an engine knock. Worst part about working on injectors in a 2940 is they are pencil injectors. With some it's an awful job trying to get them out without ruining them. Even with with the OTC slide-hammer puller.

I assume you've got the Rotodiesel injection pump. It is likely leaking at the internal shaft seals and putting diesel into your crankcase.

New (not "rebuilt") pencil injectors.





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Tx Jim

11-20-2013 06:32:13

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 Re: 2940 engine mystery in reply to jdemaris, 11-20-2013 05:46:48  
The reason I posted JD's price on rebuilt injectors is because that's what I'm familiar with looking up parts on I agree on replacing bad injectors with new injectors.
This post was edited by Tx Jim at 06:35:37 11/20/13.

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11-20-2013 08:22:08

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 Re: 2940 engine mystery in reply to Tx Jim, 11-20-2013 06:32:13  
I want to add that I am not current on all new technologies. When I worked in a pump and injector shop and a Deere dealership - there was no known way to "rebuild" a pencil injector. So, I do not know what is being done to the pencil injectors sold now as "rebuilt."

I DO know this. The meaning of the word "rebuilt" has been messed around with a bit by many sellers.

I see it this way. To "rebuild" anything is to return it back to it's original projected service life it had when brand new.

When we "rebuild" an engine - we renew all moving parts subject to wear and movement. Cylinder walls, pistons, rings, bearings, valves, valve guides, seals, oil pump etc.

But . . many pump shops sell injection pumps as "rebuilt" when often - major moving metal parts are NOT renewed in any way and sometimes have near 1,000,000 miles on them or 25,000 hours of use. They get resealed, recalibrated and often just minor new small parts installed.

With fuel injectors? We used to clean some up and recalibrate and sell as "good used", "used and checked" or maybe "reconditioned." We never had the nerve to call any injector "rebuilt" unless it actually had a brand new nozzle assembly installed. There IS no such thing for a pencil injector. But to be fair - maybe somebody has come up with a way to remachine them and renew their service life. If so - I'd like to hear more about it. A process might exist but I've yet to see any evidence. When I ask sellers - I often get an angry response like I got from Lavoy from JD Crawlers.

Considering there are brand new pencil injectors available for Case and Deere and Oliver for less then $30 each -it seems to me that high dollar attempts to "rebuild" would not be cost effective.

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11-20-2013 18:53:06

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 Re: 2940 engine mystery in reply to jdemaris, 11-20-2013 08:22:08  
I've used reman pencils for over 30 years with no ill effects. They seemed to last as long as new ones. The pintles and seats were reground.
However since new ones have gotten so cheap I have been using them.
Wonder if they are being made in China since they are cheaper than forty years ago.

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11-21-2013 05:26:43

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 Re: 2940 engine mystery in reply to D-, 11-20-2013 18:53:06  
I'd like to see some tech data on how pencil injectors are "reground." That would entail recutting the seat, recutting the valve face and then narrowing the seat back to factory specs. I'm not saying it now can't be done. I just have not seen any verifiable info on it. When we "reconditioned them" years back - we reamed out the orifices and used lapping compound on the needle and seat. It worked OK on injectors that were not all that bad to start with.

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11-21-2013 17:04:25

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 Re: 2940 engine mystery in reply to jdemaris, 11-21-2013 05:26:43  
I don't have any data. I just bought them and they worked very well.
I know what you're talking about though. Regular authentic Roosa-master diesel shops could not do the job.

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