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  1. chengny

    Fuel line adapter

    As you probably know, AN stands for Army/Navy and dash (-) number represents diameter in 1/16th's of an inch. IOW, what they are calling -9AN hose, is simply 9/16" OD hose. The hose OD/ID isn't related to the size of the fittings that are swaged to it's ends - within reason. You should be...
  2. chengny

    Fuel line adapter

    9AN? I didn't think that size existed. I am probably wrong, but I thought the only odd number sizes were 3,5 & 7. After 7 they were all even numbered sizes (8,10,12...). On the pump outlet, you are right - the thread size is 5/8" - 18. That is also the size of the threads on the inlet side of a...
  3. chengny

    79 K10

    Can you provide more detail about the black liquid. For example; does it seem like water or oil, does it have any odor, does it come out of the pipe the entire time that the engine is running or does it stop when the engine is warmed up? Have you noticed any loss of coolant? I would pull and...
  4. chengny

    Turn signal issue

    First, determine if the problem is on the hot side or the ground side of the bulb. Pull the bulb and turn on the parking lights. Go back to the socket - and using your meter or test light - check each of the contact "buttons" at the bottom of the socket for voltage. Only one should be hot. That...
  5. chengny

    Turn signals dont work fuse blows right away

    There isn't a TS/BU side to the fuse. That's just the way the circuits that the fuse protects are printed on the fuse block. A fuse has a line side and a load side. Think of the line side as the inlet side and the load side as the outlet side. Power flows into the fuse on the line side and out...
  6. chengny

    Engine cooling fan

    Nobody asked, but here is a good illustrated description of how a fan clutch operates. It was a mystery to me for a long time: A view of the internals: Engine (coolant and air from radiator) cold - the clutch is disengaged: As the engine warms up (and the temperature of the air from the...
  7. chengny

    Hayes Dana — what else did they make?

    Driveline Axles Propshafts All-Wheel Drive Electronic Limited Slip Differential Lightweight Axle Tubes Hollow Shafts Engine Technologies Valve Stem Seals Heat Shields Secondary Gaskets Active Warm-Up Cylinder-Head Gaskets Sealing Modules Exhaust Gas Heat Recovery Engine Oil Cooling...
  8. chengny

    Differential Fluid advice

  9. chengny

    TBI HELP PLEASE

    It is running rough at low loads (i.e idle) and when up to operating temperature. You changed the IAC, and that's good place to start looking for the cause of that kind of behavior. But, I have to ask, did you do an autopsy on the old one - to determine if there was anything even wrong with it...
  10. chengny

    Recommend rear wheel cylinder?

    Before you jump the PO, you might want to take a closer look at the source of the fluid and what it is. That degree of leakage would most likely have caused you to experience somewhat more severe braking problems. Inspect the axle seals for signs of leakage. Gear oil leaking from the axle...
  11. chengny

    Brake issue

    The primary functions of a BPC valve are metering (i.e. by initially limiting the flow of hydraulic fluid to the front circuit until the rear brakes can make frictional contact with the rotating assemblies and the hydraulic pressure in the rear circuit begins to rise). Once that design...
  12. chengny

    Fuel tank selector valve 6 port

    Is it worth $100 (or something like that) for you to avoid the wiring/switch changes and just replace the OEM valve with an NOS part? https://www.stockwiseauto.com/acdelco-u7001-fuel-tank-selector-valve?gclid=EAIaIQobChMIosb4oLCO2gIVC7nACh2l6w3REAkYASABEgJM2vD_BwE&ymm_gid=1&gsID=pwf656332g1&...
  13. chengny

    Front End Alignment???

    Those specs are from the 1984 GMC factory Service Manual. Maybe the attached dwgs & text will help make what they are saying clearer. First the text: A better dwg of how to determine dimension "A": An exploded view: Where to add/remove shims to adjust caster & camber:
  14. chengny

    Front End Alignment???

    The 1984 service manual only shows one set of specs for all C10's:
  15. chengny

    Temp gauge issues.

    Maybe the factory gauge is indicating the coolant temperature correctly. By how many degrees does it differ from the mechanical gauge you were using? Did you ever have a chance to run them side by side? You aren't using teflon tape to seal the sender threads in the head are you? That can raise...
  16. chengny

    Well, this sucks. Broken Brake Flare Nut

    Whatever you decide, remember that the threads play no part in creating the seal between the fitting and the flared end of the tubing. All they do is provide a means for clamping the flare to the fitting. You could probably crop 1/4" off the top of the female fitting. That extra exposure will...
  17. chengny

    Vacuum

    The way the hoses are identified should give you a pretty good idea where they should be connected. But be advised that due to the fact that you have eliminated the "EGR/PURGE TVS", the EE system will not function as well as designed. If port 2 is properly connected to the fuel tank, when the...
  18. chengny

    Vacuum

    Since its a dual fuel tank setup; when he says "air tank", maybe he's talking about the auxiliary EE canister. Only used with dual tanks. It is piggybacked onto the main one to accommodate for the additional vapor generated by the second fuel tank. It only has one hose (into the bottom), so it...
  19. chengny

    Exhaust Manifold Options

    Looks like the P/N for LH side is 14050233: https://www.ebay.com/itm/85-87-CHEVY-GMC-TRUCK-5-0-5-7-LH-EXHAUST-MANIFOLD-NOS-GM-14050233-/371019431044?_trksid=p2385738.m4383.l4275.c10 And P/N for RH side is 14031376...
  20. chengny

    Intermittent wipers

    In addition to the switch, you'll also need the control assembly (equivalent to the pulse module used on later models). P/N for the control assembly is 14056557, it was superseded by P/N 15598419 (but it doesn't matter - both are NLA). The OEM number for the switch is 14028808...
  21. chengny

    Removal of the radiator support

    There's nothing connecting the radiator support to the bumper - and there is plenty of room between them to work. I was able to strip this entire front clip without removing the bumper (or the 9' Speedcaster plow frame):
  22. chengny

    Lost gauge lights and taillights

    You didn't indicate what aftermarket H/U you are installing. But there is an international standard for aftermarket H/U wiring colors that should apply. You probably already figured out the speaker wiring, so this will only deal with the remaining leads. On the truck side, other than the two...
  23. chengny

    Lost gauge lights and taillights

    my T/L CTSY fuse melted in the fuse block. That's exactly what fuses are designed to do. Seriously, I'm sure you mean that the plastic casing (i.e. the colorful part that houses the fusible strip and associated stabs) somehow got wicked hot. So hot, that it "became as one" with the...
  24. chengny

    Left turn signal problem

    Check the grounding for the rear lighting. GM wiring diagrams always show a well designed ground circuit. Typically it is shown as a single common frame ground (bolted to the middle of the rear crossmember) which then splits into two independent branches. They then branch off and lead to the...
  25. chengny

    Delay Wiper/steering column?

    Yes Dave, I agree - I think you are doing the right thing by buying the module. You were already aware of my increasing doubt about whether the one I forwarded to you was a good spare. Everything we checked during the diagnostic procedure appeared to be okay - the module was the last component...

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