1990 Cummins Injector Pump - Pirate4x4.Com : 4x4 and Off-Road Forum
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Old 12-23-2004, 09:47 PM   #1 (permalink)
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1990 Cummins Injector Pump

My dad has a 90 Cummins 1 ton 4x4. We think the injector pump has finally gone bad (200,000). How difficult is it to remove the pump. I know the engine will have to be pinned at TDC. I've ran the valves on it before so the pinning's easy enough. Does it take a gear puller to get the drive gear off the pump?? Or does it come off when you remove the retaining bolt. Does the gears have timing marks that have to be matched up when it's reinstalled?? Or is it sufficient enough when the rebuilder times and pins the pump to just slid it back in, match the gear teeth up and tighten her back down?? Thanks..........
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Old 12-24-2004, 04:20 AM   #2 (permalink)
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I will give you the basics of it and you can decide if you want to do it or not but it would be better if you had a manual to go by.

Roll the engine to TDC and engage the pin, there is also a locknut on the pump that needs to be engaged to lock the pump. Disconnect all external injection lines, throttle linkages and wiring. Place matching marks on the timing cover and pump mounting flange. Lossen the mounting bolts, the two bottom ones are tough to get to, try using a 12mm "S" wrench or moon wrench. Remove the oil filler assembly from the front of the timing cover. Remove the gear to pumpshaft bolt. Using a sterring wheel puller and approipate metric bolts push the pump off of the gear and out the back of the timing cover. The gear stays in the the timing case and can not turn. The pump shaft is keyed and will only go onto the gear one way. Provided the locknut is engaged and the housing is marked it will go back in the same way it came out. If you get back a different pump it should be locked and will bolt back in ok but there won't be a timing mark so you may have to take it in to get timed.

For more info goto: http://www.dieseltruckresource.com/d...?s=&forumid=83
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Old 12-28-2004, 04:38 PM   #3 (permalink)
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Originally Posted by cLAYH
The gear stays in the the timing case and can not turn. The pump shaft is keyed and will only go onto the gear one way.

you dont have to take the truck in to be timed

there is a "tick mark" on the timing cover and a "tick mark" on the injector pump by tick mark I meen a scribe or punch mark if you dont see one make one (on each)

eather mark the pump to the housing or mark the housing to the pump and re install to this mark

the hardest part is getting to the inner pump mount bolts BUY THE S WRENCH

and read up on advancing the timing while the pump is off

you will find out that you cannot advance the timing to much (adjustment will not alow) so basicly if the pump gos on and the pump top is closer to the engine top than before thats better, you cant go wrong as the key and sloted holes in the pump only alow for a small margen of error which is not enough to worry about

UNLIKE a 94-98.5 which does not have a key way
Im special, just like everyone else.

Last edited by jstarnes; 12-28-2004 at 04:41 PM.
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