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  #1  
Old 06-11-2017, 06:29 PM
BluevanACD2005 BluevanACD2005 is offline
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Default Anyone experience broken injectors when raising pop pressure?

My injectors have been shimmed to achieve a pop pressure of around 2300 psi, and today I heard a knocking. I pulled the injectors and tested them... Turns out one was sticking and one failed completely.

See the pic, but the cone on the end of the spring
shattered.

https://goo.gl/photos/8T8quBH9AmYrqV8w9

I'm wondering if it's from the higher pop pressure. I replaced the nozzles and seats, but I'm trying to determine if the issue is going to return.

Spenser
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  #2  
Old 06-12-2017, 11:19 AM
anders anders is offline
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I have seen several injector springs break, a few on 6.2/6.5 GMC diesels and 2 on the D24T engines. I had one spring break 1 mile after installing a 12mm pump.

A 12mm pump and raised pop pressures works the injector internals pretty good.
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  #3  
Old 06-12-2017, 11:54 AM
ngoma ngoma is offline
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Many variables. We don't know the previous life of these injectors. High mileage? Overheating? Clumsy cleaning (easy to bend or deform the end of the pin)? Nozzle quality?

How many do testing by holding the nozzle at a 45deg. angle and seeing if the pin drops of its own weight?
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Old 06-12-2017, 12:11 PM
BluevanACD2005 BluevanACD2005 is offline
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I get what you are saying, I'll keep an eye on these and if it's a recurring problem I can lower the pressure a little.

Spenser
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  #5  
Old 06-12-2017, 05:27 PM
BluevanACD2005 BluevanACD2005 is offline
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I got the injectors back together and put them back in. I think the one injector had been sticking for a while. It runs much smoother at an idle, and is more consistent.

Spenser

BTW Adam, I got the new turbo on and am loving it! (T3/T4 hybrid, spools much sooner and I still get 20 psi from it)
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Old 06-12-2017, 10:33 PM
ngoma ngoma is offline
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That's always a welcome result!

Did you have to do much re-shimming to get them dialed in? No drips while holding pressure slightly below pop?
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Old 06-13-2017, 04:12 AM
BluevanACD2005 BluevanACD2005 is offline
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Quote:
Did you have to do much re-shimming to get them dialed in?
Nope

Quote:
No drips while holding pressure slightly below pop?
Not on the good injectors, this is how I found the sticky one. It also dropped the pressure much more on my test rig and stayed open longer. The broken injector leaked so much that my test rig wouldn't build pressure.

Spenser
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  #8  
Old 06-13-2017, 06:23 AM
anders anders is offline
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Quote:
Originally Posted by BluevanACD2005 View Post
BTW Adam, I got the new turbo on and am loving it! (T3/T4 hybrid, spools much sooner and I still get 20 psi from it)
What are the specs on the new turbo? Did you get a chance to try the 9cm turbine on that Holset?
__________________
12mm pump heads, ARP stud kits and GTD nozzles available! http://d24t.com/showthread.php?t=1646
NA intake manifolds and 240 turbo pans for sale.
Need d24 or d24t parts? PM me!

1982 242 D24+T/M46- Super pumped! Build thread:
http://www.d24t.com/showthread.php?t=1545
1984 764 D24T/ZF build thread: http://www.d24t.com/showthread.php?t=1734
Diesel parts cars: 82 244,83 244, 84 244, 84 245, 85 745
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  #9  
Old 06-13-2017, 06:30 AM
R.Mojica R.Mojica is offline
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isn't 2300psi oem pressure?
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  #10  
Old 06-13-2017, 08:21 AM
BluevanACD2005 BluevanACD2005 is offline
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Ehh.. I should know this... But I thought it was closer to 2000? I'll look on the side of the injectors when I get home. Its stamped in bars..
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