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Technical Dropped timing gear on floor...still okay to use???

Discussion in 'The Hokey Ass Message Board' started by 1950fleetline, Jul 6, 2019.

  1. I see dirt/debris, but after looking again and again, I see porosity........ I'de get a new one.
    1950fleetline and Deuces like this.
  2. Beanscoot
    Joined: May 14, 2008
    Posts: 1,340


    I can't imagine any kind of aluminum not getting similar damage if dropped several feet onto a concrete floor.
    Another good reason for a dirt floor garage!
    1950fleetline and Andy like this.
  3. Doublepumper
    Joined: Jun 26, 2016
    Posts: 586


    My guess..... they're used to help cancel out harmonics.
    Deuces likes this.
  4. The Shift Wizard
    Joined: Jan 10, 2017
    Posts: 1,880

    The Shift Wizard

    I think the aluminum is malleable enough that 5 minutes of run time will return the 5% of mushrooming back to the spec of the other 95%. I wouldn't recommend that if the smash was asymmetric or if any cracks. That's just me. Your gear, your opinion rules.
    belair, 1953naegle and 1950fleetline like this.
  5. Joe H
    Joined: Feb 10, 2008
    Posts: 852

    Joe H

    The crank gear is likely steel, my 250 inline is that way. The steel gear will clearance the deformed aluminum one in no time. File it down, and forget it.

    Dirty floor? Just how clean do you think the assembly plants were when these old engines were put together?
    belair, 1950fleetline, pitman and 2 others like this.
    Joined: Jul 20, 2006
    Posts: 2,307


    I’ll guarantee you that they were never dirty. No manufacturers would take chances of contamination in a new engine
  7. Deuces
    Joined: Nov 3, 2009
    Posts: 18,403

    from Michigan

    Tonawanda claimed they had the cleanest engine plant in the world some years back......
    Joined: Jul 20, 2006
    Posts: 2,307


    Because the crank and cam travel at different speeds
    1950fleetline and Deuces like this.
  9. ottoman
    Joined: May 4, 2008
    Posts: 280

    from Wisconsin

    File it and run.... seen worse reused with no issues
    1950fleetline likes this.
  10. spanners
    Joined: Feb 24, 2009
    Posts: 875


    Given the workload on that gear when howling around when you have the 'pedal to the metal' I wouldn't be too concerned with a little bump on the floor. If it's a reused gear the porosity wouldn't concern me either. If it was going to explode it would've done it by now.
    On the other hand if it's being used in a high revving race engine I'd probably replace it anyway.
    pitman and 1950fleetline like this.
  11. How high did it bounce? :D, Just clean it up and use it. HRP
    1950fleetline likes this.
  12. jimmy six
    Joined: Mar 21, 2006
    Posts: 5,854

    jimmy six

    Chev/GMC 6 ....won't hurt anything.
    belair, 1950fleetline and squirrel like this.
  13. dan c
    Joined: Jan 30, 2012
    Posts: 2,054

    dan c

    i've never done it, but vern tardel recommends filing to reduce gear noise...
    1950fleetline likes this.
  14. InstantT
    Joined: Aug 15, 2012
    Posts: 674

    from SoCal

    ottoman likes this.
  15. Dixon Bastie
    Joined: Apr 7, 2017
    Posts: 175

    Dixon Bastie

  16. Dixon Bastie
    Joined: Apr 7, 2017
    Posts: 175

    Dixon Bastie

    Myq two cents is garage floors and internal engine parts should never mix. Unless you enjoy having to change the "timing whirlies" in your engine, or worse, having it damaged to the point of teardown, I'd suggest not using the gear. A few more bucks spent far outweigh the risk of it failing due to an unseen flaw.
    Good luck.
    Deuces likes this.
  17. tubman
    Joined: May 16, 2007
    Posts: 4,857


    OK. I'll try. Is it so the wheels would turn at different speeds to eliminate harmonics? (You did say "guess".)
  18. I've seen worse come out of running engines with 50,000 miles on them.
  19. Deuces
    Joined: Nov 3, 2009
    Posts: 18,403

    from Michigan

    If you want to re-use it, pull all the spark plugs first and slowly crank the engine over with a rachet.... First mark that gear with a magic marker where all the dings are.... If the motor binds up in that area, go buy a new gear!.....
  20. squirrel
    Joined: Sep 23, 2004
    Posts: 45,184


    ...or file it down some more!
  21. pirate
    Joined: Jun 29, 2006
    Posts: 432

    from Alabama

    Well I’m in the your engine your decision camp. But if it were me I’d replace it with new. Unless it is an engine being assembled with used parts why chance it. The involute cut on gear teeth are very precision that can’t be replicated with a file. The cost of the gear is minor compared to the total cost of the other engine parts used.

    As far as cleanliness goes you can never have a engine build area too clean. I have seen NASCAR engine build rooms that would rival the cleanliness of hospital surgical areas. I have also been in aircraft engine build rooms you could eat off the floor.
    Deuces likes this.
  22. lumpy 63
    Joined: Aug 2, 2010
    Posts: 1,115

    lumpy 63

    On the other end of that spectrum, although the engines built for WW2 bombers fighters etc. were built in sterile environments , pretty sure in the war zone they were fixed in the dirt.
    ottoman likes this.
  23. Cause the gear is wore slap out. Its pitted. If it were mine and I was not trying to get on the road in the middle of no where just to get home I would have replaced it well before I dropped it on the floor.
    lippy, Deuces and INVISIBLEKID like this.
  24. Fordors
    Joined: Sep 22, 2016
    Posts: 2,621


    @1950fleetline mentioned early on that it is a new gear, and aluminum at that. Dress it with a fine file and put it in.
    I bet he did just that days ago.
    squirrel likes this.
  25. irondoctor
    Joined: Jan 7, 2007
    Posts: 553

    from Newton, KS

  26. saltflats
    Joined: Aug 14, 2007
    Posts: 9,896

    from Missouri

    If that gear can't take a beating on the floor, I wouldn't want in my engine anyway.
    File and go with it.
    belair likes this.
  27. belair
    Joined: Jul 10, 2006
    Posts: 8,317


    Holy cow. I would stick it in and run it. It'll self-clearance in a few seconds.
  28. els
    Joined: Sep 11, 2016
    Posts: 361


    belair likes this.
  29. thirtytwo
    Joined: Dec 19, 2003
    Posts: 2,622


    How many times do you think parts have been dropped between mfg. , warehouse, , postal guy and parts store, there is a chance you get a new one , someone dropped that too you just don’t know about it
    els likes this.

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