#1
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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 |
#2
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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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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! Shipments done on fridays! 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 |
#3
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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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1985 744 gle d24t 1985 745 gle d24t |
#4
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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 |
#5
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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) |
#6
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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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1985 744 gle d24t 1985 745 gle d24t |
#7
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Quote:
Quote:
Spenser |
#8
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What are the specs on the new turbo? Did you get a chance to try the 9cm turbine on that Holset?
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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! Shipments done on fridays! 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 |
#9
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isn't 2300psi oem pressure?
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99 Ram 2500 24V Cummins 199k 85 745 TD M46 170k (silver) 85 745 TD M46 251k (white) Holset HY35, 4" turbo back, n/a intake manifold, intercooled, GTD nozzles set to 2400psi @18psi. super pumped 86 745 TD auto 254k sold Several other current gasser Volvos. 67 122S 72k (barn find) 89 760 TIC for sale non running. 93 850 5spd 396K. 94 850 Turbo (race car) 12.55@112.4 95 850 T-5R wagon yellow 199k 04 V70R Titanium/Atacama M66 245k 04 S60 2.5T awd 255k 06 XC90 V8 305k |
#10
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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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