early 6.9 injector pump problems... - Diesel Forum - TheDieselStop.com
6.9L IDI Diesels (Not Power Strokes) Technical discussion of topics related to vehicles powered by the 6.9 Liter In-Direct Injection Navistar engines.

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post #1 of 5 (permalink) Old 08-05-2007, 06:49 PM Thread Starter
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early 6.9 injector pump problems...

Hello all,

Does anybody know if there is a early 6.9 injection pump rebuild kit available?
If so, how hard is it to do the job?

All help is appreciated.

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post #2 of 5 (permalink) Old 08-05-2007, 10:43 PM
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Re: early 6.9 injector pump problems...

Rebuilding an IP is a job for a pro. Those things are about 1000 times more complicated than a four barrel carb.

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post #3 of 5 (permalink) Old 08-06-2007, 12:49 AM
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Re: early 6.9 injector pump problems...

Yes.. Nobody here will attempt to rebuild one. The clearances are less than 1/2 thousands and a flow meter bench is needed for recalibration. [img]/ubbthreads/images/graemlins/smokin.gif[/img]

89 7.3 crewcab w/ Banks Sidewinder Wastegated Turbo. 4 inch straight piped. BTS E4OD trans with 2 extra gallons of ATF in a Mag Hy-Tec pan. Gear Vendors. Rodney Red custom aluminum radiator. Moose Pump with "G' injectors. Motor rebuilt with new after market ported heads. Mahle low comp pistons milled 12 thousands. Balanced to 1/4 to 1/3 gram. Lined bored. Block decked and sleeved on all 8. Shimed oil pump for higher pressure. Intake and exhaust logs ported too. Hypermax in shop waiting to be installed later....
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post #4 of 5 (permalink) Old 08-06-2007, 01:21 PM
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Re: early 6.9 injector pump problems...

Problem is, this is such a specialized device, that it truely requires specialized training and tools. For example, if your advance piston has the slightest slop in fit, it won't work. Rebuilders shine a light through the bore with the piston in it, and study it for many minutes trying to determine if the slightest bit of light is getting through. If it is, then the bore must be rebored and an oversized piston installed. This requires a lot of machining experience and precision equipment. I have a big Index brand 32" verical mill in my basement, and I know I would not be able to do this operation with the precision that is needed.
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post #5 of 5 (permalink) Old 08-06-2007, 01:26 PM
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Re: early 6.9 injector pump problems...

Believe us when we say, this is a job left to Superman or a professional in injector pumps.

You'll save alot of money and time just taking it to a good injection shop to have it rebuilt.

Seattle Injector here will rebuild a pump for the 6.9 for 500 bucks and turn it up a notch for you if you want.

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