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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 05-02-2005, 02:34 PM   #1 (permalink)
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Injector Pump Timing

I've got to change an injector pump tonight, it's been a couple of years since I've done one. I just need to know to time the two gears.

Thanks, Greg
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Old 05-02-2005, 08:32 PM   #2 (permalink)
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Re: Injector Pump Timing

Don't REMOVE THE GEARS!you access the pump bolts thru the little cover on the front or on a 6.9 you remove the fill tube!
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Old 05-02-2005, 08:42 PM   #3 (permalink)
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Re: Injector Pump Timing

I am assuming you are talking about the Injector Pump (IP) timing gear. First of all, don't turn the gear or move it out of the spot where it is on the cam gear (that is unless it turns along with the whole motor)!!! [img]/ubbthreads/images/graemlins/eek.gif[/img] If you get, or have gotten, the teeth on the IP gear and the cam gear out of time, you will have to pull the water pump and front cover in order to time the pump again.

Now if you have moved or taken the gear off already, you'll need to line the "Y" (I think it is) on the cam gear up with the one on the IP gear.

If you haven't started on it yet, don't take the gear cover case off with the IP (the cover that has the oil filler neck on it). Just take the little plate off the front and middle of that cover (two bolts I think). Then remove the three bolts in the center of the IP gear and slide the pump out (after you have all the other bolts off of course) being careful not to turn the gear (the gear might wiggle back and forth a little and that's okay).

When putting the pump back on, just line the dowel up on the IP and IP timing gear and replace the three timing gear bolts. (These three bolts I've talked about are not the same as the nuts that attach the IP to the gear cover case). Hope this helps (hope you can understand my giberish) and feel free to ask any other questions.
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1989 F-250 7.3 IDI N/A, 5 speed, no muffler. Injector Pump turned up 145*.
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Old 05-02-2005, 10:57 PM   #4 (permalink)
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Re: Injector Pump Timing

Greg

[ QUOTE ]
If you get, or have gotten, the teeth on the IP gear and the cam gear out of time, you will have to pull the water pump and front cover in order to time the pump again.


[/ QUOTE ]

Actually, this isn't true. There is a very easy method of finding the correct teeth to match up the cam/injector pump timing gears, if you get them messed up.

Essentially, though, what the boys are telling you is correct. It is not necessary to remove the pump timing gear cover to change the pump. You access the 3 pump bolts from inside the cover plate (or the fill tube as Fred says) and once they are undone, the pump simply pulls out the back side of the cover, and the new one goes in exactly the same. There is a dowel pin, which must align inside there, and you'll see it. It isn't difficult.

IF, you remove the timing gear cover by accident, pm me, and I'll post the simple way to align the gears back up.

Zigg [img]/ubbthreads/images/graemlins/smile.gif[/img]
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Old 05-02-2005, 11:19 PM   #5 (permalink)
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Re: Injector Pump Timing

Really? How do you line the gears up if you move them? I looked and looked and couldn't find a way to line them up exactly (I messed up when I was putting my motor together).
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1989 F-250 7.3 IDI N/A, 5 speed, no muffler. Injector Pump turned up 145*.
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Old 05-03-2005, 10:39 AM   #6 (permalink)
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Re: Injector Pump Timing

mine moved and I used a very small mirror to find the Y in the engine. Once you find it mark it with some paint and align the two back together. it was hard as hell to do but it worked for me.. [img]/ubbthreads/images/graemlins/biggrin.gif[/img]
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Old 05-03-2005, 09:04 PM   #7 (permalink)
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Re: Injector Pump Timing

[ QUOTE ]
I looked and looked and couldn't find a way to line them up exactly

[/ QUOTE ]

Ok, it's really quite simple.

Sounds a bit complicated but it's not.

On the injection pump gear, you need to find the "y" mark. Turn it so the "y" mark is down at the bottom. On either side of that mark count upwards 19 teeth. Mark a line across the front of the gear between the 19th tooth on each side up from the "y" mark. Next, mark a line up from the "y" mark through the center of the gear at exactly 90Deg to the first line.
Now, you have to turn the engine to TDC. (#1 piston at top of it's travel at compression stroke-must not be on exhaust stroke) Make sure the line on the balancer aims exactly at "0" on the timing plate(found down under the alternator.) If you are on exhaust rather than compression stroke, the timing will be out by 180 Degrees. The engine may run, but will be very difficult to start, smoke whitish like you wouldn't believe, and not have any discernable power.

Once you have all this done(sounds more complicated than it is.) the "y" mark on the camshaft gear will be at the top. You then drop the injection pump gear into place so that the "y" mark is on the bottom, and the vertical line is in the center of the detent in the front plate, and the horizontal line between the 2 teeth is exactly parallel to the top of the engine.

It should look like this:
..pic one..
and this:
..Pic two..
and this:
..Pic three..

If you do this, it will be perfectly lined up. If you're out by even one tooth, nothing will line up. You'll see. Put the pump cover back on being careful not to lift/move the gear. Install the pump, and you're good to go.

It doesn't require dental mirrors or flashlights or any kind of pain. and only takes about 20 minutes or so.

If you have any problems, PM me, and I can walk you through it. I also have a complete engine apart in my shop right now if you need any more pics.

Good luck with it.

Zigg [img]/ubbthreads/images/graemlins/smile.gif[/img]
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My Website here,
Now: '93 F350TurboCrewcab 4x4 E4OD with dead 7.3, soon to be replaced with new 7.0LTurbo(bored 6.9)
Wife's car: '86 mercedes 300 T.D.
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Old 05-04-2005, 01:38 AM   #8 (permalink)
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Re: Injector Pump Timing

That is pretty simple. Thanks for the information! This will help me alot on the motors I'm building. Thanks again!
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2001 F-250 Powerstroke, Automatic. Zoodad mod, Airaid filter, muffler delete, Boost fooler, Edge Evolution, Turbonetics 0.84 turbo. Best 14.88@88MPH, 314hp@617trq.

1989 F-250 7.3 IDI N/A, 5 speed, no muffler. Injector Pump turned up 145*.
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Old 05-04-2005, 09:09 AM   #9 (permalink)
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Re: Injector Pump Timing

Thanks guys that's what I needed. I had to switch a 6.9 over to the 7.3 pump housing. and install a different pump. I also need to retime a 7.3 I've got apart. All the information I need shoud be here. Thanks, again.

Greg
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