6.9 injector pump timing - 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 08-22-2010, 05:45 PM   #1 (permalink)
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6.9 injector pump timing

hey so i took my injector pump off do do headgaskets and i was carefull taking it off to not spin the gear but im not sure if its right i didnt mark it or anything it is my first time i didnt know. so im wondering how i will know how to get it on right and set the timing right. thank you
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Old 08-22-2010, 06:14 PM   #2 (permalink)
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If the gear cover was not removed, chances are the gears are still "timed" right. Since the IP is held on with 3 bolts and a locating dowel, it will be in the right spot. Once the engine is running, you'll know if the timing is out by the way it runs. You can make timing changes to the IP with the ENGINE OFF and loosening the bolts on the back of the housing.
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Old 08-22-2010, 11:38 PM   #3 (permalink)
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o ok yeah i pulld the whole cover off the 4 bolts going to the block where it has the oil fill tube... so should i just get it as close as i can with the gears and the time it once on ?
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Old 08-28-2010, 05:27 PM   #4 (permalink)
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You have to get the IP gear back in the one and only right spot. One tooth off won't do it.

Take a look at this article:
Talk About Timing. Be sure to click the under-lined links to view the pictures.

Scratch a line on the IP and the IP gear-cover to allow you to set the dynamic timing back to where it was. Then you need to get the gear back in the right spot. Because of the cut of the gear teeth, these rarely drop back in the right spot.
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Old 09-02-2010, 02:12 PM   #5 (permalink)
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That's not good. I'm afraid you are going to have to pull the water pump, and front cover off the motor. Otherwise, you will never be able to see the timing marks on the crank, cam, and IP gears. Please read the above article that shows how the timing marks are to be positioned. You will not be able to do this without removing the front cover. You should get a new front main seal and a front cover gasket set (will include a water pump gasket as well).

Once you have the gears in correct time, install the front cover and then install the IP gear cover. Once the IP gear cover is installed, there isn't room for the gear to jump time. Install the water pump and then the IP.

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Old 09-02-2010, 02:57 PM   #6 (permalink)
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You certainly CAN get it in proper time without removing the front cover. That would be a heck of a lot of unecessary work.
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Last edited by LMJD; 09-02-2010 at 03:06 PM.
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Old 09-02-2010, 11:14 PM   #7 (permalink)
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In the talk about timing article if you look at the pictures zigg links to, he is showing how to get the gear back in time without removing the front cover.
Just a note not mentioned in the article: It is possible to get the gear 180 degrees out and these engines will run, just smoky and no power.
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Old 09-03-2010, 01:25 AM   #8 (permalink)
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i got it i uses a mirrior wit a piece of tape on it to get it down in the crack to see the y but i got it its all together thanks
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Old 05-04-2012, 10:37 PM   #9 (permalink)
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Definitely going to try re-timing my injector pump now. the guy before me told me he lined it up with the dot, and I thought that sounded wrong for some reason. It does run, but smoky, and with little power, as stated. How badly will the motor run if it is 180 out? The guy I bought it from said he couldn't find a y so he timed it to a dot. After reading all of this, I feel like it might be off, but I think it might run just a little too well for that. Is it possible for these to flood? It seems to run okay, but with a LOT of smoke, because I think the previous owner turned the IP up a lot, maybe too much.
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