adidasman23

my friend has a 1995 cummins 12v and he baught a p7100 pump from someone and the pump wasn;t at top dead center when he pulled it out. does anyone have any pictures to show how to put it there. i talk to some people about pulling a bolt and putting a tool in there but i would like to see some pictures.

John Faughn

You could do like you were timing on eng. , let some fuel gravity feed into the pump , turn over till it starts coming out of #1 DV , put on truck and fine tune .

infidel

Normally you don't use the above pin when removing/replacing a pump. On the side of the pump that would face towards the outside when installed there is a hex head cap that has a pin under it. You pull the pin out and turn it around, rotate pump until the pin falls in place, replace the cap. Install the pump with the engine at TDC and you should be at stock timing.

infidel

Here's a better picture of the hex head I was talking about

logskidder

On the left side of the pump(the side that would face the drivers side fender with the pump mounted on the engine) about 8" back from the pumps mounting surface, you will see what looks like a big nut about 1" in dia give or take (its been awhile) remove the cap and you will find a nylon pin,pull the pin out of the cap. You want to turn the pump shaft while looking into the hole where you just removed the cap from. You will see a tooth come around, turn the shaft until the tooth is in the center of the hole and lock it into place with the nylon pin. This is TDC, you can then turn the engine to TDC and bolt the pump on and it will run but you will have to advance the timing. Sorry I dont have any pics but its really easy to figure it out when you look at everything.

adidasman23

how can you set the pump to advance it like 18*

logskidder

You need a timing set( snapon has a nice one for 200 bucks) with the pump at TDC and both timing pins pulled, use the timing set to adjust your timing where you want it 16* works nice, pin your pump, remove the timing gear( just pop it off the shaft) turn the engine back to TDC remove all pins reinstall the gear........its easy. Just becareful not to turn the engine with the pins in,they will shear off.

adidasman23

ok the guy said he had it worked on before at it was set at 18* will it still be set at 18* when i put it at TDC or will it be just at TDC

logskidder

If the pump is off another engine you will be at TDC

adidasman23

no the pump on the other engine was set to 18* timming. what i am trying to ask it do they do that internally or by they way to set it TDC

logskidder

No its not internal......its your #1 plungers position in reference to the cam/crank. Sorry I cant think of a better way to say it

adidasman23

so you have to turn the shaft in order to advance it.

logskidder

With the pump on the engine and the pump gear pulled(poped off the shaft) turning the shaft will advance/retard the timing.......however you need a timing set to see what you are doing.

adidasman23

so its just like a cam shaft

logskidder

it is a camshaft