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  • Users: Ed Martin
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  1. Ed Martin

    Leaking Pinion Seal

    My 68 roadrunner is leaking differential oil from the pinion seal. It's the original 8-3/4 differential '742' with a 1-3/4 pinion. I drive it about every three weeks and it only leaks about every other time I drive it, probably about a teaspoon. I'm wondering whether replacing the pinion seal...
  2. Ed Martin

    68 RR Radio Trim Adjustment

    Does anyone know where the trim adjustment is located on a stock 68 Roadrunner thumbwheel AM radio? Can it be adjusted without taking the radio out? Thanks for any help.
  3. Ed Martin

    Broken Radio Cable on 68 RR

    Has anyone had to repair or replace a radio antenna cable that's broken where it plus into the radio? I can't find any replacement cables except with the entire antenna. I don't know how difficult it would be to replace, even if I could find just the cable. How about doing a splice repair...
  4. Ed Martin

    T-type Bumper Jack

    What are you guys using for jacks? My original 68 Roadrunner jack broke a couple years ago. I have an old scissors jack if I need (rarely) in the garage. But I worry that in an emergency if I need on the road, what to use? I see Classic, Mega Parts, Ebay, etc. have new T-types for around...
  5. Ed Martin

    Defroster Duct Connection to Vents

    I have a 66 Roadrunner without AC. Does anyone know how the defroster ducts are connected to the defroster dash vents at the windshield? I tried to pull it loose but it didn't want to come off. It is not frozen in place and moves some but something seems to be holding it, but I don't see...
  6. Ed Martin

    Light Bulb for Sun Super Tach

    Has anyone ever replaced the light bulb in an original Sun Super Tach? How do you get it apart to get at the bulb? Thanks for any input.
  7. Ed Martin

    SOLD 14x6 Mopar Road Wheels with Trim Rings

    PN 3580065 with 4 inch backspace. Set of four for $200 plus shipping from Raleigh, NC or pickup. Used on Charger, Roadrunner, Coronet, Super Bee. I took these off a 73 Charger in the late 70s, but now converted to Magnum 500s. PM me if interested. Thanks
  8. Ed Martin

    Alternator Draining Battery?

    Something is causing my battery (new in December 2019) to slowly lose voltage when sitting for a week at a time without being driven. This has happened three times (not every time) in the last 2-3 months. When I go to start it, I find the voltage has dropped to 12.0V. The only thing I know...
  9. Ed Martin

    Alternator for 68 Roadrunner?

    I haven't shopped for an alternator for my 68 roadrunner in about 30-40 years. Where can I get a good quality new stock-type direct replacement which my manual calls for a 44-51 Amp size. I don't have a high electrical load. Using a P3690732 regulator with electronic ignition. What's the...
  10. Ed Martin

    68 Roadrunner shroud recommendations

    I have a stock 383 with a recently re-cored radiator that is fine at highway speeds (180 degrees); but will overheat in traffic and can boil-over when pulling into the garage in the North Carolina summertime. I keep the coolant level at least 1+ inch from full but covering the core. I'm...
  11. Ed Martin

    Coil Voltage Needed?

    My 68 Roadrunner will not fire up at all for 8 months (but cranks good). In that time I replaced the carburetor, coil, battery, cap, rotor, ignition switch, plugs, ballast resistor and ECU module and checked ECU ground. Now I think it's a voltage problem so have done lots of voltage and...
  12. Ed Martin

    68 RR glove box liner puzzle

    When re-installing a new cardboard glove box liner and inserting the door spring bracket: after the liner is wrestled into the opening (but not screwed in yet) and then installing the bracket, does the liner fit directly against the top (outside) of the top of the frame opening and then the...
  13. Ed Martin

    68 RR Ignition Switch

    I think I will have to replace my ignition switch to see if I can get more than 9.4 volts at the + coil while cranking (key in start). Other posts indicate the switch could be the problem. I have already replaced the coil, resistor and ECU. Battery is at about 12.4 volts. I'm sure the...
  14. Ed Martin

    Spark but no Fire

    Please help. This is related to my post on October 1, 2019. This is still driving me crazy! Summary: replaced carb, coil, cap, rotor, ECU, plugs, 2-pin ballast resistor, checked reluctor gap at 0.010-0.012". Now can get spark at coil and end of one plug wire (just checked one), but it only...
  15. Ed Martin

    Can Wet Plugs Fire?

    My 68 383 RR cranks but does not fire. I replaced the coil, cap, rotor, ECU and verified a good spark at coil and at one cylinder. Tried to start it several times during replacement of the above parts (a week or two apart each try) over a period of several weeks. At first I thought it was a...
  16. Ed Martin

    Carb Starting Problem

    I'm having trouble starting my 68 Roadrunner 383 with stock intake and 600 cfm Holley carb that I installed late last year (previous post Dec 28, 2018). I can pump the pedal three times (it only cranks), 2 more pumps and with lots of cranking it will fire up but runs real rough and then shuts...
  17. Ed Martin

    Carb Starting Problems

    I just installed a new Holley 80457SA 600 cfm carburetor with electric choke on a stock 68 Roadrunner 383 manifold. When starting I have to crank and crank while trying different things with the pedal. First I pump it once to the floor and let up before turning the key. But it just cranks, so...
  18. Ed Martin

    Painting a metal valley pan gasket

    Does anyone know if painting a Fel-Pro embossed metal valley pan gasket (on a 383) can be done without a primer before painting with the same engine enamel (Mopar P4120752AB turquoise) used on the original manifold?
  19. Ed Martin

    Carb for 68 Roadrunner?

    Any recommendations for a carb (original Carter AVS or Holley) for a stock 383? Years ago I replaced the original manifold with a Torker single plane manifold and Holley 6909 carb. Now want to put the original manifold back with a new carb (because of problems with the 6909). I'm looking for...
  20. Ed Martin

    68 Roadrunner Exhaust Replacement

    Does anyone know if the original Roadrunner 383 had chrome exhaust tips and what size diameter piping was used?
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