Search results

  1. DrCharles

    Where's the boost?

    I can play with timing, and probably make some more incremental improvements. But I keep coming back to: And I'm not seeing any boost unless the engine is under load. So more and more I think my worn turbo is at fault. One company says they'll inspect it for a non-refundable $65, but if I go...
  2. DrCharles

    Where's the boost?

    Would jumpering the cold advance solenoid (to stay on) be too much advance for a test? I've got a Mac Tools box that triggers off a line clamp, but I don't own a dial-back timing light. Before moving anything, I'd definitely mark the pump flange to make sure I could get it back where it was :)...
  3. DrCharles

    Where's the boost?

    I can try that too. Would you recommend advancing or retarding it? :dunno Supposedly it's set to factory NA (8 deg) now. There is a very audible difference when the cold advance is on (rattle) and the engine is much quieter once it warms up and shuts off the advance.
  4. DrCharles

    Where's the boost?

    Well, yeah :) But there isn't much left that would explain the symptoms! I now have enough fueling to make black smoke (and with high EGT), can't find any exhaust or intake leaks, can't get over 7 psi, and I know the bearings are way looser than the specs... I've already put a fair bit more...
  5. DrCharles

    Where's the boost?

    That's in line with most of the rebuilder services I found online. :cool: The $230 (shipped) CHRA's on eBay claim to be balanced and have a warranty, like this one: https://www.ebay.com/itm/1992-1994-Ford-F-Series-7-3L-Diesel-TC4303-TC4305-Turbo-charger-CHRA-Cartridge/253253595568 What about...
  6. DrCharles

    Where's the boost?

    How much $ are we talking about? PM me if you don't want to post prices here :)
  7. DrCharles

    Where's the boost?

    OK thanks. I have rebuilt a couple of turbos before, so it doesn't scare me (as much as having to R&R it again!) ;) I'm thinking of just buying a cartridge (CHRA) rather than getting a bearing & seal kit, taking it apart and find out something else is scored/damaged.
  8. DrCharles

    Where's the boost?

    Thanks, I am aware of that :) Your definition of "exhaust" apparently differs from mine - which is, anywhere between the manifolds and the end of the tailpipe. So that includes leaks in the piping upstream of the turbine, of course! :p Meanwhile, more data. I'm actually overfueled now for the...
  9. DrCharles

    Where's the boost?

    Found the torque screw. The locknut (two 3/8" flat sides) is a major PITA with the airbox in place but it can be done. I backed it out two full turns. Now I see a moderate gray cloud of smoke when I floor it below 2000 rpm which goes away as the turbo spools up. On the back road I got 6.5...
  10. DrCharles

    Where's the boost?

    That's reassuring :) Truck starts fine when hot. In fact I'm considering modifying the GP controller to avoid afterglowing when warm, since it doesn't seem to need it and changing GP's is even more of a PITA now that I have a turbo. The tanks, showerheads, FSV, and fuel lines are all less than...
  11. DrCharles

    Where's the boost?

    That's an interesting case report. Thanks!:cool I'm not sure if my pump has a torque screw (may or may not be the original), but will definitely look tomorrow... I did some light reading this evening http://radionerds.com/images/f/f4/Stanadyne_db2_operation_and_instructions_manuals.pdf...
  12. DrCharles

    Where's the boost?

    I was reading this thread (on the torque screw) and now I'm more confused than ever... https://www.oilburners.net/threads/torque-screw.38325/ Some people say it does nothing above 1100 rpm. Near the end of the thread there's a comment that on the NA trucks it's seated against the jam nut, but...
  13. DrCharles

    Where's the boost?

    The only thing I've tried so far is the fuel screw. I have read your DB2 Tuning Guide on here... do I really need to do more adjustments to run 10 psi boost? Most every article I've seen on the factory turbo setup says that a couple of flats is all the increase that should be needed. :dunno Or...
  14. DrCharles

    Where's the boost?

    Yes, I'm sure that I turned the screw. It's quite stiff but turns smoothly, with none of that unpleasant slipping/popping feeling from a rounded off female hex, and it's a snug fit. I am just surprised that it seemed to have no effect at all, and no increased smoke. The turbo is definitely...
  15. DrCharles

    Where's the boost?

    Right. ;) I was expecting that turning up a properly working pump 4 flats would look like a mosquito-fogger in the mirror... Too bad there isn't a way to check the IP output with it on the truck... if I have to go to the trouble of removing it, a good rebuilt one will definitely be going back...
  16. DrCharles

    Where's the boost?

    I remember there being some axial play, but I'd expect a little with no oil pressure since the shaft floats in the bearing. No noticeable radial play. Compressor wheel intact. I do not see any boost when revving at least to 2500 in neutral. Has to have a load on the engine, then it'll make...
  17. DrCharles

    Where's the boost?

    I am getting the downpipe-to-tailpipe connection fabricated tomorrow afternoon. Yes, it won't affect boost at all, but I don't want an audible leak, not least because I am trying to see if I have other boost leaks :) Today I removed the K&N filter that came with the airbox and put in a paper...
  18. DrCharles

    Where's the boost?

    Turned it up 2 flats per the usual recommendation. I'm going to see if the exhaust shop can make me a bend to properly (and removably) connect the Banks downpipe to the 3" tailpipe. The flex pipe is leaking audibly which is likely masking an up-pipe leak. One thing at a time :) Meanwhile the...
  19. DrCharles

    Where's the boost?

    I was hoping for the easy fix too, so I disconnected the wastegate line. No change. :( Relatively slow climb to just under 6 psi. It rained for over 48 straight hours and everything is saturated. Today there's a bone-chilling wind (and still no sunshine to dry anything out) so I probably won't...
  20. DrCharles

    No heater fan ideas

    A lot of those DC brush motors will occasionally work for a while when persuaded by a bump. The brushes, bearings or both are on their last legs. Check the connections, sure, but my money says it's the fan motor itself.
  21. DrCharles

    Truck cranks runs fine till warms up then

    How many miles on the injection pump? Are there any problems starting it when hot?
  22. DrCharles

    No heater fan ideas

    The heater fan motor is a well known failure point... I think I've replaced it on every Ford truck I've owned ;) Does that Bronco have the same blower location as the F-trucks (sticking out from the heater box under the hood)? If so it takes less than 30 minutes to replace. Be careful not to...
  23. DrCharles

    What would this be called and any suggestions about getting it off or replacing?

    3/32 is .0938", whereas 2.5 mm is .0984" so if it's really a 3/32 hex, it's not surprising that you had to tap it in. A tighter fit is safer for not rounding it out though, especially if you aren't planning to reuse the screw.
  24. DrCharles

    Where's the boost?

    When I got the truck, it had just a straight 3" pipe (and no turbo) so it was obnoxiously loud. I must be too old ;) Actually it's very quiet, exits in the right rear. It's a pretty big muffler. The only time I can hear it over the IDI (and the old, hard Mud Terrain T/A's at any speed over 40...
  25. DrCharles

    Where's the boost?

    Thanks. I'll definitely try that too, especially if I can't find an obvious boost leak. I think it's less likely to be the culprit though, because the wastegate lever is in the closed position at rest, and the spring feels plenty strong.

Latest posts

Forum statistics

Threads
92,929
Posts
1,155,105
Members
26,430
Latest member
Brownlee5212

Members online

Total: 620 (members: 1, guests: 619)

Share this page

Top