Replacing Injector Pump
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Registered User
Joined: Apr 2004
Posts: 86
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From: Alberta
Replacing Injector Pump
So I changed the pump and couldn't get it going. Look here and found a thread with the same problem. I bled the lines, still nothing.
Figured the key fell out. Pulled the oil fill tube and took off the nut on the IP gear. Used a small peice of wire and couldn't feel the key. Oh well it fell, hopefully I don't have to pull the front cover off now.
Got it all apart and this is what I find.
Sorry the pic is a little bad.
Looks like the key sheared.
Anyone ever hear of this. Is there a certain strength key to be used? This is the key that came with the pump.
Now I also had a problem putting the pin back in for TDC. I pulled the vavle cover for number one and it seemed it was there, but the pin wouldn't go in. So I got it at 6 o'clock and pulled the pump. I am going to try again now that there is more room with the pump removed.
So now how do I know if the pump is time right? If the shaft keyway is a 6 o'clock is it good or can it be at 6 o'clock twice like the engine?
Thanks for any input.
Figured the key fell out. Pulled the oil fill tube and took off the nut on the IP gear. Used a small peice of wire and couldn't feel the key. Oh well it fell, hopefully I don't have to pull the front cover off now.
Got it all apart and this is what I find.
Sorry the pic is a little bad.
Looks like the key sheared.
Anyone ever hear of this. Is there a certain strength key to be used? This is the key that came with the pump.
Now I also had a problem putting the pin back in for TDC. I pulled the vavle cover for number one and it seemed it was there, but the pin wouldn't go in. So I got it at 6 o'clock and pulled the pump. I am going to try again now that there is more room with the pump removed.
So now how do I know if the pump is time right? If the shaft keyway is a 6 o'clock is it good or can it be at 6 o'clock twice like the engine?
Thanks for any input.
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Joined: Apr 2005
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From: Terre Haute,IN
This is why you should pull and install a pump with the key at 12 oclock or 1oclock. The pump will only go on ONE way. The engine (gear) is keyed, the pump is keyed (shaft). Go or no go. Not like a p-pump or other non-keyed pump shaft.
That key in the picture looks like it can be used again. If I remember right, you can just put the curved end of the key into the pump shafts slot. As far as keeping there upside down, I don't know.
That key in the picture looks like it can be used again. If I remember right, you can just put the curved end of the key into the pump shafts slot. As far as keeping there upside down, I don't know.
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Joined: Apr 2005
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From: Terre Haute,IN
You could rotate the engine to where the key in the pump gear is at ~ 1 o'clock. Just use your finger in the hole to keep the gear from rolling into the housing. Sort of support it so it meshes with the cam gear. Then you can rotate the pump shaft to that position.
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Joined: May 2006
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From: Philly PA
That is the shaft woodruff key, You could use a tad of heavt grease to keep it on place on the shaft while installing, Do not glue it in in any way!
It is a tight fit in the shaft/gear, any glueing may cause real issues installing!
Good luck!
It is a tight fit in the shaft/gear, any glueing may cause real issues installing!
Good luck!
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Joined: Mar 2003
Posts: 923
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From: TX
Make sure you pull the timing pin... If the key is loose I use a center punch and put a small punch mark on the side of the key. Then tap it into the shaft.. Like BG said.. just turn everything how you want then install the pump.. Its not like a P pump.. It can only go in one way.. As long as the gear isn't removed.. the gear should stay in time.
Good Luck..
Bryan
(They can be fun to remove when they get sheered.)
Good Luck..
Bryan
(They can be fun to remove when they get sheered.)
Thread Starter
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Joined: Apr 2004
Posts: 86
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From: Alberta
Just unlock the pump and rotate the shaft by way of the nut and a wrench to your desired position.
You could rotate the engine to where the key in the pump gear is at ~ 1 o'clock. Just use your finger in the hole to keep the gear from rolling into the housing. Sort of support it so it meshes with the cam gear. Then you can rotate the pump shaft to that position.
You could rotate the engine to where the key in the pump gear is at ~ 1 o'clock. Just use your finger in the hole to keep the gear from rolling into the housing. Sort of support it so it meshes with the cam gear. Then you can rotate the pump shaft to that position.
The pump rotates once for each engine rotation twice? Same as cam?
And I know this but just confirming, TDC on one, both valves are up the arms are "loose"?
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Thread Starter
Registered User
Joined: Apr 2004
Posts: 86
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From: Alberta
Just another question, can the IP gear move when the pump is off? Could it jump a tooth? Is there enough room for that.
Also, can I just buy a woodruff key anywhere or do I need a special "strong" one.
Also, can I just buy a woodruff key anywhere or do I need a special "strong" one.
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Joined: Mar 2003
Posts: 923
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From: TX
Usually the Gear will not get out of time.. You'll have to work at it to get it to jump a tooth.
Yes.. it basically opens up to each injector line as it turns.. and pushes a piston up to force the fuel out to the lines.. Yes.. its running at Camshaft speed..
I'd make sure the pump will make a complete rotation.. something could be wrong inside the pump.
I'm going to leave the Key question to someone else.. we always had an extra around... but if you have a cummins dealer around I'd start there.. (or even a John Deere Dealer... ) Just take what was left of the old key..
Bryan
Yes.. it basically opens up to each injector line as it turns.. and pushes a piston up to force the fuel out to the lines.. Yes.. its running at Camshaft speed..
I'd make sure the pump will make a complete rotation.. something could be wrong inside the pump.
I'm going to leave the Key question to someone else.. we always had an extra around... but if you have a cummins dealer around I'd start there.. (or even a John Deere Dealer... ) Just take what was left of the old key..
Bryan
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Joined: Dec 2005
Posts: 701
Likes: 32
From: Mossy Head, FL
So I changed the pump and couldn't get it going. Look here and found a thread with the same problem. I bled the lines, still nothing.
Figured the key fell out. Pulled the oil fill tube and took off the nut on the IP gear. Used a small peice of wire and couldn't feel the key. Oh well it fell, hopefully I don't have to pull the front cover off now.
Got it all apart and this is what I find.
Sorry the pic is a little bad.
Looks like the key sheared.
Anyone ever hear of this. Is there a certain strength key to be used? This is the key that came with the pump. Sometimes you miss the slot by a little and that will damage the key also.
Now I also had a problem putting the pin back in for TDC. I pulled the vavle cover for number one and it seemed it was there, but the pin wouldn't go in. So I got it at 6 o'clock and pulled the pump. I am going to try again now that there is more room with the pump removed.
So now how do I know if the pump is time right? If the shaft keyway is a 6 o'clock is it good or can it be at 6 o'clock twice like the engine?
Thanks for any input.
Figured the key fell out. Pulled the oil fill tube and took off the nut on the IP gear. Used a small peice of wire and couldn't feel the key. Oh well it fell, hopefully I don't have to pull the front cover off now.
Got it all apart and this is what I find.
Sorry the pic is a little bad.
Looks like the key sheared.
Anyone ever hear of this. Is there a certain strength key to be used? This is the key that came with the pump. Sometimes you miss the slot by a little and that will damage the key also.
Now I also had a problem putting the pin back in for TDC. I pulled the vavle cover for number one and it seemed it was there, but the pin wouldn't go in. So I got it at 6 o'clock and pulled the pump. I am going to try again now that there is more room with the pump removed.
So now how do I know if the pump is time right? If the shaft keyway is a 6 o'clock is it good or can it be at 6 o'clock twice like the engine?
Thanks for any input.
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