7.3 - injection pump gear adjustment - Diesel Forum - TheDieselStop.com
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7.3L IDI Diesels (Not Power Strokes) Technical discussion of topics related to vehicles powered by the 7.3 Liter In-Direct Injection Navistar engines.

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Old 12-28-2007, 01:42 PM   #1 (permalink)
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7.3 - injection pump gear adjustment

well, first off, let me say thank you to the forum for all of the valuable information that i have read, the information that the members of this forum hold is nothing short of mind blowing.

- i have a 1990 f-250 lariat xt cab 4x4,which i tore down last winter because of a bad valve ( actually several valves were bad due to un lubricated valve seats, so i had the head done and slapped it back on) during the head job process we ( a friend of mine and me) got a little carried away and pulled the ip pump/housing and gear off ( wish i knew then what i know now ) so needless to say we had a hard time putting the ip back on with the gear in the right place, we loosened the ip pump and timed it the best we could, the ip scribe line is sitting approximately 1/4 " of the corrisponding housing line to the retarded position (drivers side) you can visually see that the pump is tweaked and retarded. The truck runs suprisingly pretty good but not 100%, it has a little vibration to it that i never have felt before we did this and i know it is out of time.
so to make a long story short - i am ready to pull it in the barn and get working on it, it has been a great truck and only has 220k miles on it with no rust, and up here in central NY that is a feat in itself.
Any help getting this IP back to its rightful position would be greatly appreciated.
I would love to take some photos as i complete this process to contribute to the forum,
Thanks
azlan
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Old 12-28-2007, 02:07 PM   #2 (permalink)
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Re: 7.3 - injection pump gear adjustment

Here's an article on how to do it.
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Old 12-28-2007, 02:12 PM   #3 (permalink)
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Re: 7.3 - injection pump gear adjustment

thanks,
real fast reply, extremely helpful information,
thanks
ryan
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Old 12-28-2007, 02:20 PM   #4 (permalink)
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Re: 7.3 - injection pump gear adjustment

Well the truck is running and you know which way you need to turn the gear. Take off the little cover on the front, mark the gear orientation. Now take off the IP and tower, loosen the IP nuts, and turn the IP so the timing mark lines up. MAKE SURE the gear does not move except for the distance it moves when you turn the IP. Mark the gear orientation again in case you bump it on re-installation, and put everything back together.

No need to go through the whole timing fiasco to just move it or or two teeth.
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