Injector O-Rings? - Ford Powerstroke Diesel Forum
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post #1 of 3 Old 10-06-2010, 04:00 PM Thread Starter Rookie
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Injector O-Rings?

I just changed the head on the passenger side, I switched over all my stuff from old head (injectors, rockers, etc). I didn't change the injector orings when I swapped them, they looked ok to me, and the engine only has around 66,000miles on it. After getting it running it was hard to start (took awhile cranking, I figured it was just air working it's way out of the HPOP system. I drove it for a while today, and it's still hard to start (cold & hot) takes like 10 seconds of cranking before it turns over. If i shut it off and restart it right away it's fine, but if a wait like 5 minutes it's hard again.
I noticed after I turn it off a noise coming from only that head/side. It sounds like air or pressure leaking/bleeding. Kinda a hissing sound. Could this be the high pressure oil leaking from around the injector orings, and that's why it's hard to restart since it need to rebuild the oil pressure?

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post #2 of 3 Old 10-07-2010, 02:35 PM
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When ever you remove the injectors its always a good idea to replace the O-rings on them. On customer trucks it normally takes driving 6 miles round trip on the interstate and a good 5 cold starts and 5 warm starts before all the air is out. Now I dont want to make you sound stupid but when you heard this noise was it right after you shut the truck down with the A/C ON? Drive it with the A/C OFF and see if you still hear it. The sound might be the pressures equalizing across the orface tube in the A/C line which is right next to the passenger side head.
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post #3 of 3 Old 10-08-2010, 11:53 AM Thread Starter Rookie
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Hi, thanks for the reply. You were right, it just needed to be driven. Starts right up now, better than I think it ever has! lol As far as the hissing sound, you might be right, and I do feel a ittle stupid, I wasn't thinking about the ac being on, but the defroster was on, so I think you were right, I turned off the heating/ac and the noise stopped.

I ordered injector O-rings anyway. Figured be good to have them on hand if I ever need to pull the injectors or it starts acting up.
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