Ford 7700 injector timing

blackcat · Sep 22, 2017

I am having trouble getting the injector pump timed on a 1980 7700 Ford with a Simms pump. This tractor hasn't run for years, and the last time it did it went to full throttle and wouldn't shut off, had to shut off fuel to kill it, that's the reason the pump was rebuilt. According to the shop that rebuilt the pump it's set at the home position and from what I have read from I&T shop manual and online the #1 piston should be 23 degrees before top dead center and the the pump should bolt up, well none of the bolt holes on the input shaft of the pump and the holes in the drive gear line up. I am not a diesel mechanic, but understand timing, I have had many distributor out of gas burners and got it running again. I also understand timing marks, I worked on copiers from 1973 to 2005 and the old ones were timing nightmares. but I always got them running. Any help would be appreciated!!!

Welding man · Sep 22, 2017

Does your pump have the timing marks on the front of the pump or back of the pump? Did you
have the engine properly timed before removing the pump? Did you crank the engine over
while the pump was off? If you did you may get to pull the timing cover and start over.

Destroked 450 · Sep 22, 2017

Set the flywheel at 23 degrees, looking in the front of the gear housing through a slot in the gear you'll find a timing mark on the front of pump near the 2:00 position, rotate the pump flange until the mark on the flange aligns with the mark on the pump body.
Put the bolts in and tighten, don't forget the triangle shaped retainer plate.

If the gear covers the timing marks on the pump rotate the engine another turn because it's 180 degrees out

Setting the flywheel times the engine.
Aligning the marks on the pump times the pump.

Dieseltech · Sep 22, 2017

Since the gear and hub have three bolts, and pump turns at 1/2 speed it will only go on CORRECTLY one way. If the gear bolts are WAY off at 23 degrees BTDC, engine needs turned ONE revolution back to 23, then the pump will go into place as it should. Sounds like it was removed with out setting the timing first.

blackcat · Sep 22, 2017

(quoted from post at 11:57:07 09/22/17) Does your pump have the timing marks on the front of the pump or back of the pump? Did you
have the engine properly timed before removing the pump? Did you crank the engine over
while the pump was off? If you did you may get to pull the timing cover and start over.

blackcat · Sep 22, 2017

Yes it was removed without timing being set, didn't have the I&T manual then, it was in a shed without power for lighting, I have since moved it to my machine shed with lighting and air compressor, and cement floor and even cleaned up so I can get around it without stumbling over junk. This pump has the timing marks on the front a dot on the hub and a mark on the housing about 2 o'clock, I couldn't find the dot till i called the pump shop and they told me where to look, it really hard to see, they are lined with each other. I think I have tried turning the engine another turn but will try it again, probably won't get to work on it for a while tomorrow is full, it my 50th class reunion, yep I'm an old geezer.

Ford 7700 injector timing

blackcat

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Welding man

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Destroked 450

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Dieseltech

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blackcat

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blackcat

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