Well, using a pressure rig from Kim Lux' instructions, I pressurized the passenger side rail and found it would pump right up to 3,000 psi
but bleed off to nothing in about 15 minutes.
I was little bummed out since I was sure that o-rings were the smoking gun from all the discussion of symptoms.
Quit for the night and cleaned up as it was about time to say goodnight and get the kids off to bed.... then it occurred to me that I ought to test the driver's side head before I called it quits.
ZERO pressure could be held in the driver's side rail with my test rig. The rig uses a grease gun as a pumping source for the 15w/40 oil and moves a pretty small volume each stroke. But for comparison, I think it only took about 6-8 pumps to hit 3,000 psi
on the other side, pumping as fast as I could I was only able to get the needle to slightly rise off the peg.
Pulled the valve cover today and could see oil gush out from around the base of the injector when I tried to pump up the rail... pretty clearly a bad o-ring on the #2 hole. Pulled all four injectors on that side and found the top cushion o-ring shot, shaved away to the point that the circle was broken and the sealing o-ring was pushed up into its place where broken!
There was NO metal backing ring behind the cushion ring!
Pulled the passenger injectors since they were modified all at the same time and found the same destroyed upper cushion rings on all of them. Again no metal backing ring on any of them! Some how they were able to hold pressure, even in their distorted condition.
Not sure if the metal ring was unknowingly left off or if it was a different design that obviously doesn't work. The injectors had only being in for about a year and a half.... way premature for failure.
Took lots of pics (of the test rig too) and will post when I finish up the o-ring install. I am using Alliant o-rings as they are appearently the OEM manufacturer of the injectors themselves. The kit includes all three parts of the upper o-ring set - Metal backing, square-cut cushion, and upper o-ring - Middle and Lower o-rings and the copper washer.
Sorry for the long post but people had asked for me to keep them posted. I think it is helpful to others too so that if they encounter similar things, they will have a starting place.
Thanks again to those who got me pointed in the right direction to find the bad o-rings!
***Dinner time here on the west coast and the chicken is ready to come off the BBQ!!!
97 F350 CC
LB 4x4, ZF-5, LUK, Off-Road. Factory Alcoas, Michelin LTX-M/S LT265/75-16, Bilsteins. Homegrown intake, 4" exhaust, LUK clutch, 130cc injectors, 99+ intercooler, homegrown CCV mod, homegrown electric fuel system, still sorting out tuning/chip burns.
27' Travel Trailer, Prodigy brake controller.
1991 5.0 LX
- Best 1/4: [email protected]
1989 Taurus SW
(To be like Tom S!)
Link to my Intercooler/Fuel System Install page - To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
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