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Thread: Lurching Issue

  1. #1

    Default Lurching Issue

    I've got a 59' Series II SWB and am having some clutch issues (or so I'm guessing). The problem is a lurching sensation, like when someone who is learning to drive a manual can't figure out how much gas to give it.

    When I first start out driving, everything is fine and the transition between gears is smooth (including the double clutching from 1st to 2nd since there are no syncros).

    The lurching starts after driving for a bit and really only happens when starting from a dead stop in 1st gear. No matter how hard I try to balance clutch/gas, I almost have to rev the engine too much and let off at a snails pace in order to get the truck moving to the point I can get going without lurching.

    I've replaced the master cylinder, slave cylinder and lines, and flushed the entire system multiple times (not a hint of air bubbles). Terrified to hear it's the clutch itself, but with the difference between functioning when it's "cold" vs. lurching when it's warmed up, I'm wondering if that's the case.

    What in the damnation am I doing wrong?

    Thanks for any pointers

  2. #2

    Default

    Nut loose on the clutch pedal?

    Just kidding!

    Wonder if the clutch operation is fine but you have something causing the engine to hesitate when it should accelerate smoothly. Like retarded timing from points that have closed down, ignition advance frozen, carb accelerator pump not working, for example.

  3. #3
    Join Date
    Sep 2010
    Location
    killingworth CT
    Posts
    701

    Default

    Quote Originally Posted by erik88lr View Post
    Nut loose on the clutch pedal?

    Just kidding!

    Wonder if the clutch operation is fine but you have something causing the engine to hesitate when it should accelerate smoothly. Like retarded timing from points that have closed down, ignition advance frozen, carb accelerator pump not working, for example.
    True ,
    This problem could be outside of the clutch and hydrolic system, sounds like I would, check points, timing. Is there enough fuel to carb? It is classic for these issues to happen after truck is warm and running for a while, are there some meter test to do on a coil? good luck.

  4. #4
    Join Date
    Apr 2007
    Location
    Scottsdale, Arizona
    Posts
    885

    Default

    Your castellated nut at the back of the main shaft of the transmission is likely loose. You will need to remove your overdrive to access it, and use your workshop manual to get the proper procedure.

  5. #5
    Join Date
    Nov 2006
    Location
    California
    Posts
    24

    Default

    Lurching might also be caused by weak or broken damper springs on the clutch disc. A harmonic torsional oscillation can be induced in the driveline if the spring rates aren’t correct.

    1967 NADA 109 IIa SW
    1974 88 III

  6. #6

    Default

    When this was happening on my series II it turned out my rear main seal was leaking enough oil to containment the clutch, replacing the clutch fixed the issue.

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