1986 F-250 6.9 L injectors - Diesel Forum - TheDieselStop.com
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6.9L Diesels Technical discussion of topics related to vehicles powered by the 6.9 Liter In-Direct Injection Navistar engines.

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Old 09-07-2005, 02:11 PM   #1 (permalink)
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1986 F-250 6.9 L injectors

Hi all, new to trucking with the 6.9L, I was hoping if anybody would know if it important to use the same injectors with the pump, like A's or B's etc. injectors are they just about the same, and how do you fine out if you are useing the right ones, with your pump?
thanks
Phil
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Old 09-08-2005, 12:05 AM   #2 (permalink)
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Re: 1986 F-250 6.9 L injectors

You can't (not a good idea, even if they physically will bolt up) interchange the '83 'A' parts and later parts. If you want the details, go here and download "69lupdatepart4.pdf" and look at page 3 ("A4"). There were major changes in '84 (higher compression ratio, different pistons, different heads, different precups, different injector internals and popoff pressure, etc.). Note esp. the paraphraph that reads,

"DO NOT INTERCHANGE 1983 ("A" model) with 1984 and later ("B" model) nozzles. Engine performanc will be adversely affected."

That's straight from Ford.
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Old 09-08-2005, 09:11 AM   #3 (permalink)
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Re: 1986 F-250 6.9 L injectors

It might be streight from Ford, but don't believe it for a minute. I have both A and B engines, and you can pretty much do what you want as far as injectors are concerned. None of us worry much about running factory calibrations anyway. As long as you have a pyro, you can put whatever injectors you want in there. Ford is more worried about emissions and EGT's for the uneducated with that particular statement. Looks like somebody needs to take better care of "the diesel files" since it's obviously been comprimised.
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Old 09-09-2005, 12:09 AM   #4 (permalink)
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Re: 1986 F-250 6.9 L injectors

So the pump does not have to match up with the injectors, A's or B's etc.My year is 1986 F250 6.9 L It has A's now, but on ebay someone has D's he say's they add a little bit more fuel, I want less smoke, I do know you are to have some smoke though, and D's will smoke a little more? Do you all think this is right way of thinking. [img]/ubbthreads/images/graemlins/confused.gif[/img]
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Old 09-09-2005, 02:47 PM   #5 (permalink)
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Re: 1986 F-250 6.9 L injectors

The letters indicate pressure changes, but likely all the injectors move about the same amount of fuel. Maybe not [img]/ubbthreads/images/graemlins/tongue.gif[/img] What color smoke do you have? New injectors may help if the smoke is due to improper combustion, but if you are over-fueling, have bad timing (inj pump settings both) or have maybe something else (how's your air filter/intake system?) new injectors may not help.
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Old 09-10-2005, 01:25 AM   #6 (permalink)
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Re: 1986 F-250 6.9 L injectors

Injection quantity in a diesel is controlled by the IP, not the injector. This is in contrast to a gasser, which uses a fixed pressure and injector ON time + orifice diameter to control fuel quantity.

However, the different injectors used on our engines are rated for different fuel volume. This means that if you use a lower-volume injector at a high IP volume setting, the pressure on it will be proportionally higher -- or something will break. That's the nature of hydraulics.

The 'B' injectors are supposed to have longer spring travel, a larger orifice, and lower (1425 PSI) opening pressure. These were offered in conjunction with a higher compression ratio (pistons .003" higher, whoopee!; larger swirl cavity in the pistons' crowns; smaller precup chamber in the head -- making the heads non-interchangeable from '83 to later engines; smaller volume precups), and recalibrated fuel curve in the IP to work with lower opening pressure injectors.

I don't know the 6.9l very well, but based on this (published) information, I personally wouldn't mix 'A' model parts (IP, injectors, pistons, heads) with later lettered parts, with the possible exception of a later IP &amp; injectors -- as a set.
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Old 09-14-2005, 12:41 AM   #7 (permalink)
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Re: 1986 F-250 6.9 L injectors

I have black smoke under load, I thinks more than the norm, new air filter, and fuel filter, the engine has 800 K,s on it now, just rebuilt it, but not the pump or injectors.
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Old 09-14-2005, 01:31 AM   #8 (permalink)
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Re: 1986 F-250 6.9 L injectors

Whoa! 800K? Kilometers or miles? or did you mean 80K miles? If 800K either which way you can bet that pump and injectors are toast if original or probably even older than 200-300K miles. Avg lifespan on the ones from the factor way &lt;100K on the early pumps and maybe 150-200K on later units and remans... I think if you ahve a rebuilt engine you owe it to yourself to spring for the pump and injectors as a set. I ahve heard it both ways on the 83 injectors....but Mel usually knows what he's talking about. Personally, I would just make sure the timing is good and get a set of injectors which are compatible. In other words don't mix "A" and "D" injectors or "G" and "BB" and so on.
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Old 09-14-2005, 09:17 AM   #9 (permalink)
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Re: 1986 F-250 6.9 L injectors

Put you year make model VIn # and any other details about your truck in your Signature so we can accurately assess problems with your truck. [img]/ubbthreads/images/graemlins/grin.gif[/img]
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Old 09-14-2005, 09:17 PM   #10 (permalink)
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Re: 1986 F-250 6.9 L injectors

The total kilometres is 475, I did the rings about 800 kilometres ago.
Over all the truck runs great, just black smoke under load, I would say more than normal.On the injector pump, there are some no.s 5708,and on the injectors, The first letter is an A .
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