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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.
     
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  2. Beanscoot
    Joined: May 14, 2008
    Posts: 936

    Beanscoot
    Member

    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!
     
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  3. Doublepumper
    Joined: Jun 26, 2016
    Posts: 351

    Doublepumper
    Member

    My guess..... they're used to help cancel out harmonics.
     
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  4. The Shift Wizard
    Joined: Jan 10, 2017
    Posts: 1,276

    The Shift Wizard
    ALLIANCE MEMBER

    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.
     
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  5. Joe H
    Joined: Feb 10, 2008
    Posts: 733

    Joe H
    Member

    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.
  6. OLDSMAN
    Joined: Jul 20, 2006
    Posts: 1,748

    OLDSMAN
    Member

    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: 17,211

    Deuces
    Member
    from Michigan

    Tonawanda claimed they had the cleanest engine plant in the world some years back......
     
  8. OLDSMAN
    Joined: Jul 20, 2006
    Posts: 1,748

    OLDSMAN
    Member

    Because the crank and cam travel at different speeds
     
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  9. ottoman
    Joined: May 4, 2008
    Posts: 272

    ottoman
    Member
    from Wisconsin

    File it and run.... seen worse reused with no issues
     
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  10. spanners
    Joined: Feb 24, 2009
    Posts: 754

    spanners
    Member

    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.
     
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  11. How high did it bounce? :D, Just clean it up and use it. HRP
     
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  12. jimmy six
    Joined: Mar 21, 2006
    Posts: 4,317

    jimmy six
    ALLIANCE MEMBER

    Chev/GMC 6 ....won't hurt anything.
     
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  13. dan c
    Joined: Jan 30, 2012
    Posts: 1,869

    dan c
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    i've never done it, but vern tardel recommends filing to reduce gear noise...
     
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  14. InstantT
    Joined: Aug 15, 2012
    Posts: 642

    InstantT
    Member
    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: 4,099

    tubman
    ALLIANCE MEMBER

    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: 17,211

    Deuces
    Member
    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: 42,655

    squirrel
    Member

    ...or file it down some more!
     
  21. pirate
    Joined: Jun 29, 2006
    Posts: 257

    pirate
    Member
    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.
     
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  22. lumpy 63
    Joined: Aug 2, 2010
    Posts: 799

    lumpy 63
    ALLIANCE MEMBER

    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.
     
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  23. porknbeaner
    Joined: Sep 12, 2003
    Posts: 40,959

    porknbeaner
    Member

    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.
     
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  24. Fordors
    Joined: Sep 22, 2016
    Posts: 1,904

    Fordors
    Member

    @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.
     
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  25. irondoctor
    Joined: Jan 7, 2007
    Posts: 548

    irondoctor
    Member
    from Newton, KS

  26. saltflats
    Joined: Aug 14, 2007
    Posts: 9,276

    saltflats
    Member
    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: 7,976

    belair
    Member

    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

    els
    Member

    PAINT IT BLUE, CALL IT NEW.
     
    belair likes this.
  29. thirtytwo
    Joined: Dec 19, 2003
    Posts: 2,507

    thirtytwo
    Member

    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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