Injector needle shim?

wannabecummins

wannabecummins

Baloney Tugboat
Joined
Feb 6, 2010
Messages
124
So today I was putting my 90hp nozzles on my brand new injectors. Got through 4 of them and then noticed a small little metal disc. Took another nozzle off and this disc(shim?) fell out as well. It fits into a bore in the pressure pin between the nozzle. What is it? Also if one fell out what would the consequences be? I guess I'm lucky I noticed it before it was too late. I forgot to take a picture
 
Those are the shims that set pop-off pressure; more shims, the higher the injection pressure. They're important; if you're missing one then that cylinder will be smokey and low on power.

I set my pressures a few years ago when I had access to a pop-off tester; I used cheap little zinc washers with the holes drilled out a little bit. I'm told that's not what you want to use to set pressures, but I haven't noticed any ill effects...

I've also heard of people making shims using a soda can and hole punches. I don't know if I believe them though.
 
So on DDP's nozzle swap instructions they have a picture of the little "puck" I'm talking about. They mention not too mix them up. How critical is this? Unfortunately I don't think these pucks all ended up in the original injectors they came from
 
wannabecummins said:
So on DDP's nozzle swap instructions they have a picture of the little "puck" I'm talking about. They mention not too mix them up. How critical is this? Unfortunately I don't think these pucks all ended up in the original injectors they came from
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Well in that case, you are going to need someone to re-set the pop off pressures. That is if this is a 12 valve, I don't know about 6.7 injectors if that's what you are talking about.
 
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I'm thinking he's talking CR here guys.

If you are talking about those almost invisible little shims you better try and find them. It won't run without them.
 
Snedge said:
I'm thinking he's talking CR here guys.

If you are talking about those almost invisible little shims you better try and find them. It won't run without them.
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Sorry guys, Snedge is right its a 04.5 5.9 commonrail. I found all the shims and put one in each injector. The truck runs perfect as far as I can tell. Is it an issue of they got mixed up is my concern, and what are there purpose?
 
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