Injector shim

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Sep 14, 2012 | 05:45 AM

rLmcowboy

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Joined: Apr 2010

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Injector shim

I have 3 injectors that I need to shim to get desires pop pressure. Any ideas where I can buy some. I don't have any old extra injectors to use for parts

Sep 14, 2012 | 09:17 AM

86f350

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Joined: Oct 2007

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From: Whitestown, IN

you need to find old core injectors. Ive heard of some ppl using washers from a hardware store with decent luck. remember + or - .001 thickness is equal to + or - 50lbs of pressure.

Sep 14, 2012 | 10:13 AM

BeerCan500

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Joined: Aug 2012

Posts: 218

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From: Ft. Worth

Shims

Quote:

Originally Posted by 86f350

you need to find old core injectors. Ive heard of some ppl using washers from a hardware store with decent luck. remember + or - .001 thickness is equal to + or - 50lbs of pressure.

Yes your are right about shim thickness and corresponding pressure. I would just like to add the pressure to look for after shimming is 1800 to 1950 PSI...but I'm sure everybody knows that...

Sep 14, 2012 | 02:03 PM

eatont9999

Cargo Master

Joined: Dec 2010

Posts: 2,123

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From: Fort Worth, TX

You can use a washer or stack washers if you want. Just make sure they have a hole in the middle. To adjust the thickness of the washer, you can lap it on some fine sand paper on top of a piece of glass. You may want to use some oil for the final lapping.

I have looked for sources of injector shim kits and any that I found were expensive.

This is your quick answer:
https://mercedessource.com/node/5287

Maybe these guys can offer something:
SUN DIESELSYSTEMS - Injector Nozzles

Sep 14, 2012 | 03:44 PM

turtlemann14

Elder User

Joined: Aug 2007

Posts: 589

Likes: 2

From: Nutter Fort,West Virginia

could always tear up a set of feeler gauges.
might be fun to poke a hole in them though

Sep 14, 2012 | 05:16 PM

linus72

Senior User

Joined: Nov 2011

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hey Eatont9999

would that help in my situation?

can you lower the opening pressure with shims or just increase it?

you know if my lift pump/ip is weak can i get the injectors to open at a lower pressure or no??

thanks

Sep 14, 2012 | 05:33 PM

BeerCan500

Senior User

Joined: Aug 2012

Posts: 218

Likes: 0

From: Ft. Worth

Pressure

Quote:

Originally Posted by linus72

I think if you get around 1400 psi or less the injectors won't work....as far as lowering pressure using shims...I don't think so...The idea behind shims is to make a weak spring stronger...so to speak...

Hope that helps ya..

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Sep 16, 2012 | 07:20 PM

greywynd

Posting Guru

Joined: Dec 2005

Posts: 1,528

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From: Peterborough, Ontario

Huh....I have enough shim stock and tools to make these I should go into business....what's the ID and OD of the shims?

Sep 17, 2012 | 09:48 AM

#10

eatont9999

Cargo Master

Joined: Dec 2010

Posts: 2,123

Likes: 5

From: Fort Worth, TX

Quote:

Originally Posted by linus72

In your situation, I think messing with the injectors would only make things worse and cost you more money and time. In theory, yes, if you have a weak IP, lowering pop pressure may help the injectors fire but you will also be advancing the timing and atomization will be much less. Then, you still have a weak IP with limited life.

I really don't think the IP is to blame. Update your current thread once you have tried a few more things that have been suggested.

Also, if you have a shim punch tool, you can make shims out of sheet metal. Feeler gauges are good to use because you already know what size you have.