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  1. Rupert8

    Return line question

    Thanks, yes, I see your point. I'm wondering, though, if air can get in at this apparently loose spot when the engine is off then maybe it is bubbling up to the highest point, which is likely the air filter? The truck runs fine when it's going, but is hard to start and each time it's hard to...
  2. Rupert8

    Return line question

    Hello, Still trying to find the source of air intrusion. O-rings etc all replaced. New return lines..... When I leave the truck for more than a few hours there is air trapped up in the air filter - when I bleed it only air comes out for a while. My question: The steel return line connection...
  3. Rupert8

    Knocking after injector change

    Air intrusion. Right. We'll, I replaced all the fuel return lines recently. Where else are common points of ingress? I'll look into that.
  4. Rupert8

    Knocking after injector change

    Thanks for the information. So may I ask what the common indicative symptoms of a failing fuel injection pump are? It sometimes struggles to start when it's warm (but not always...). It is currently struggling to start when cold, which is new. Used to fire up first or at most second try in all...
  5. Rupert8

    Knocking after injector change

    Hello, sorry for the slow reply. I was waiting a while to get a clear picture of where things stood and, well, you know.... But the new injectors are functioning fine. It's been a few months now since they were installed. That's the good news. The bad news - it's having a hard time starting...
  6. Rupert8

    CDR valve - what is this part?

    Thanks. Was this on a 6.9? I tried yesterday and while the existing metal tube just slots right into place, the rubber one (ribbed part) won't fit down inside the valley pan, and didn't seem to want to go any other way. My metal tube is in good shape, happily, so I'm using that, but curious...
  7. Rupert8

    CDR valve - what is this part?

    Thanks. Does it replace the existing metal tube or go inside it? (Yes, stock placement.)
  8. Rupert8

    CDR valve - what is this part?

    Hi, What is the part circled in the photo? It's made of rubber. Going to replace the llarge 'O' gasket (also pictured) on my CDR valve but not sure what to do with the other part in the kit I bought. The CDR currently has a small o-ring going into the metal tube which then goes down into the...
  9. Rupert8

    Changed CDR valve and now trouble...

    These runaway engines tales are like the best bedtime stories. And my takeaway from all of these is to cut the air supply in the case of one happening. Small chance of it happening, but valuable knowledge.
  10. Rupert8

    Changed CDR valve and now trouble...

    Fascinating. So we are talking about removing the air filter and blocking the air intake at that location? (All done while the engine is running very fast?)
  11. Rupert8

    Changed CDR valve and now trouble...

    Ok. This is embarrassing. Rechecking under the hood, I found a vacuum hose had somehow gotten stuck under the throttle assembly, holding it open, and making the truck rev. A lot. Thing is, humiliating as this is to write, I have no idea how it got under there. I didn't go under the hood after...
  12. Rupert8

    Changed CDR valve and now trouble...

    Hello, I recently posted a separate thread regarding changing out the CDR valve on my 1986 F250 6.9. Job done, and the truck ran fine yesterday, ran very well, even, with the new CDR valve installed. I went to start it this afternoon and it turned over for a long time and just wouldn't start...
  13. Rupert8

    CDR valve replacement question

    Got it. Much appreciated once again. I'm reusing the metal tube and will replace the gromet when it arrives.
  14. Rupert8

    Oil pressure sensor location...

    Ok, so I poked around... The valve cover areas (driver and passenger side) both look dry, which is great. I pulled off the cover under the bell housing and there is some oil in there - but not a lot. What is there is on the passenger side. But certainly less than I was expecting to see...
  15. Rupert8

    Oil pressure sensor location...

    Fully understood, Old Goat. The problem isn't the reading of threads late into the night it's then grabbing a flashlight and finding myself under the truck at all hours checking out what I've just read.... Great information, thank you. I won't have time for a while but I'm going to look into...
  16. Rupert8

    Oil pressure sensor location...

    Thanks. Not sure I'm liking the sound of leaks at the valve cover or rear main seal.... Is that common on these engines? Needing immediate attention? I'll swear it didn't leak at this location before I changed the oil. Is there an additive which might help as a temporary 'band-aid' until I can...
  17. Rupert8

    CDR valve replacement question

    Thanks. I'm learning a lot here for the first time. Would that be the 'standard' position for the CDR valve on a 1986 6.9 IDI? The longer plastic piece would go inside the metal tube?
  18. Rupert8

    CDR valve replacement question

    Hi, Does anyone have a diagram - or series of photos - for CDR valve replacement? My reason for asking: I took my old one off yesterday (lots of oil inside, think it was the original) and there was a lot of broken plastic down below where it was. Not sure where this plastic came from. Really...
  19. Rupert8

    Oil pressure sensor location...

    Thanks, all. Old Goat, I'll remove the bell housing inspection plate tomorrow and see how things look inside. I removed it recently to drain the torque converter and I didn't notice a lot of oil. But worth checking again. I changed the oil in the truck a month ago and it seems to be leaking...
  20. Rupert8

    Oil pressure sensor location...

    Aha! I wasn't looking in the right place at all. Looks like it's this guy in the photo. If so, that means the oil I see escaping from around the torque converter area, from the cover that goes over the flywheel down there, per previous photos, is coming from somewhere else as the oil pressure...
  21. Rupert8

    Oil pressure sensor location...

    Hello, I know there are multiple threads on this topic and I've read all the ones I can find but I just can't locate anything I believe to be the oil pressure sensor on my 1986 F250 6.9 IDI. I have a small(ish) amount of oil leaking from the flywheel cover area by the transmission and I'd like...
  22. Rupert8

    Knocking after injector change

    To be totally fair he said it was an absurd proposition - and told me to send them in for testing. I am also skeptical that three are bad - but I do have a feeling the shop I took it to did a thorough job - let's see how the truck holds out..... I could drive myself crazy doubting each side of...
  23. Rupert8

    How best to replace high-pressure power steering hose....?

    I have not - but I guess I still need to get in there to access that. Thanks for the tip. I'll report back once I get to this job - been having injector trouble (per another thread.....)
  24. Rupert8

    Knocking after injector change

    Hello all, So I finally picked up the truck today. Hated spending the $$s to get it looked at professionally but I just needed it working and reliable. This thread is getting up there in length now but if you remember there were two sets of injectors that I tried, and the engine knocked with...
  25. Rupert8

    Knocking after injector change

    Thank you, Old Goat - I have checked out the suggested threads, nothing that seems to match this situation, unfortunately, although I certainly learned some useful stuff. As for repair shops, my first question was 'do you work on the old 6.9 IDI's'? You are right, a fair few said no - but...

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