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Detroit bent valves

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Worthken, Jul 1, 2013.

  1. Jul 1, 2013 #1
    Worthken

    Worthken Light Load Member

    265
    83
    Jun 2, 2012
    Delmas South Africa
    0
    Can anybody explain to me how it's possible for n Ser 60 Detroit to bend both exhaust valves on no 1 cyl, without touching the piston. Both valves quaters are stil intact. I'm baffled.
     
    Worthken, Jul 1, 2013
    Worthken, Jul 1, 2013
    #1
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  3. Jul 1, 2013 #2
    BullDoggin

    BullDoggin Light Load Member

    183
    56
    Jan 27, 2013
    0
    what are quaters?
     
    BullDoggin, Jul 1, 2013
    BullDoggin, Jul 1, 2013
    #2
  4. Jul 1, 2013 #3
    Worthken

    Worthken Light Load Member

    265
    83
    Jun 2, 2012
    Delmas South Africa
    0
    Valve spring retainers.
     
    Worthken, Jul 1, 2013
    Worthken, Jul 1, 2013
    #3
  5. Jul 1, 2013 #4
    BullDoggin

    BullDoggin Light Load Member

    183
    56
    Jan 27, 2013
    0
    I'd say they had to have hit the pistons.
     
    BullDoggin, Jul 1, 2013
    BullDoggin, Jul 1, 2013
    #4
  7. Jul 1, 2013 #5
    Worthken

    Worthken Light Load Member

    265
    83
    Jun 2, 2012
    Delmas South Africa
    0
    That is what baffles me. There is absolutely no mark on the piston. Two valves hitting would leave an indent. Say it did hit the piston, what would be the cause. Could the guides have seized, causing the valves to stay open too long. The motor has definately not being overreved. Both exhaust valve stems are bent.
     
    Worthken, Jul 1, 2013
    Worthken, Jul 1, 2013
    #5
  8. Jul 1, 2013 #6
    GrapeApe

    GrapeApe Road Train Member

    2,215
    2,211
    Jan 7, 2013
    0
    How do you know it wasn't over-revved, did you extract DDEC reports? The pistons are pretty tough, it only takes a kiss to bend valves, so marks may not be easily seen, especially if it wasn't shut right down. Stuck valve guides are possible, but not likely. It'd be more likely for 1 to have a problem, but why 2 at the same time? Is the rocker shaft galled, it's more likely that the rocker stuck holding both valves open.

    What were the circumstances leading up to the problem? Any recent work on the overhead?
     
    GrapeApe, Jul 1, 2013
    GrapeApe, Jul 1, 2013
    #6
  9. Jul 2, 2013 #7
    Worthken

    Worthken Light Load Member

    265
    83
    Jun 2, 2012
    Delmas South Africa
    0
    After close inspection, I found the problem. The piston hit the valves, infact the head. I pulled the piston today, and found the piston crown broken. One thing I noticed, the marking on the conrod on that piston faced the oposite direction. All the other conrod markings faced the cam, this one faced the other way. If a piston was installed the wrong way could it cause the piston to break?
     
    Worthken, Jul 2, 2013
    Worthken, Jul 2, 2013
    #7
  10. Jul 3, 2013 #8
    snapon2

    snapon2 Bobtail Member

    42
    8
    Jan 13, 2011
    grande prairie alberta
    0
    If it only bent exhaust valves I would check the jakes also to make sure they did not hang up
     
    snapon2, Jul 3, 2013
    snapon2, Jul 3, 2013
    #8
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