Crank bolt marked.

Discussion in 'General Motoring' started by Burt S., Nov 10, 2005.

  1. Burt S.

    Burt S. Guest

    I'd loosen the crank bolt then marked the bolt, washer and pulley. It
    took three hard push to release. Each push produces a crack. Upon
    release I quickly tighten the bolt to 83-ft-lb, there is no snap or crack.
    Then release again but no crack. Then realizes that I should have mark
    the bolt before releasing.

    Put oil on the threads and took less than a quarter turn to tighten from
    7 ft-lb it to 83-ft-lb. Went for a drive. The marks didn't move. This isn't
    conclusive yet. The face of the bolt and washer show signs galling, a
    surface that has been rubbed by something else. See

    http://square.cjb.cc/images/boltfaces.jpg

    I had to use some of Jim's similar images - can't find my camera.

    I might need to get a new washer and bolt just to see if the galling
    returns. A few years back I'd removed a 92 Accord, 92 Civic crank
    bolt, most likely their first timing belt change. No locktite. These
    bolt didn't produce a loud crack or galling as I'd expected. Here's
    more statistics on the subject car:

    At 230k:

    Bolt face galled: Yes
    Hard to remove: No; about 90 ft-lb, one swing, 3/4" ratchet - no ext.
    Color of threads: Grey from lube
    Thread degrease: Yes
    Threads oiled: Yes
    Reused bolts: Yes
    Bore threads cleaned: No
    Torque to: 83 ft-lb

    At 280k, Yesterday:

    Bolt face galled: Yes
    Hard to remove: Moderate; 98 ft-lb, took 3 swings, 3/4" ratchet - no ext.
    Color of threads: Grey from lube
    Thread degrease: Yes
    Threads oiled: Yes
    Reused bolt: Yes
    Bore threads cleaned: No
    Torque to: 83 ft-lb

    If the bolt moves or gets tighter I'll post a follow-up - but don't know when.
     
    Burt S., Nov 10, 2005
    #1
  2. Burt S.

    Elle Guest

    Just looked at these. Interesting pics. Something's turning at some time. It
    seems to me the scoring could just be the loosening by hand or final
    torquing by hand. The pulley-crankshaft assembly is being held steady when
    tightening and loosening everything, after all.
     
    Elle, Nov 11, 2005
    #2
  3. Burt S.

    Elle Guest

    Just looked at these. Interesting pics. Something's turning at some time. It
    seems to me the scoring could just be the loosening by hand or final
    torquing by hand. The pulley-crankshaft assembly is being held steady when
    tightening and loosening everything, after all.
     
    Elle, Nov 11, 2005
    #3
  4. Burt S.

    Simon Beaver Guest

    At some point in time somebody forgot to tighten the bolt correctly or
    left out the key. But then if someone left the key out then the washer
    shouldn't look like that. You really need to get a new bolt and run the

    test again. This time, also clean the bore threads.

    If you only hear that crack sound going one way but not the other
    direction then that means that the bolt had stretched. This would
    mean that the bolt took more turn to loosen but less turn to tighten.
     
    Simon Beaver, Nov 11, 2005
    #4
  5. Burt S.

    Simon Beaver Guest

    At some point in time somebody forgot to tighten the bolt correctly or
    left out the key. But then if someone left the key out then the washer
    shouldn't look like that. You really need to get a new bolt and run the

    test again. This time, also clean the bore threads.

    If you only hear that crack sound going one way but not the other
    direction then that means that the bolt had stretched. This would
    mean that the bolt took more turn to loosen but less turn to tighten.
     
    Simon Beaver, Nov 11, 2005
    #5
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