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Technical Sun Tach disassembly

Discussion in 'The Hokey Ass Message Board' started by cretin, Jun 28, 2021.

  1. cretin
    Joined: Oct 10, 2006
    Posts: 2,962

    cretin
    Member

    A14D6319-8C44-4B40-8D00-4172AC16B7A6.jpeg 76F50FF3-A2FD-4D98-A10B-AA092129474F.jpeg Hey guys, yesterday the face of my Sun tach came loose inside the housing. I’ve pulled it off so that I can repair it. My question is, does the black plastic backing come off or do I need to pry the bezel off the front to get in there?
    Thanks.
     
    loudbang likes this.
  2. 427 sleeper
    Joined: Mar 8, 2017
    Posts: 1,297

    427 sleeper
    ALLIANCE MEMBER

    Bump for the morning crew...
     
  3. cretin
    Joined: Oct 10, 2006
    Posts: 2,962

    cretin
    Member

    I’m sure someone has been inside one of these before. The plastic on the back is already a little cracked, so if it doesn’t come off, I don’t really wanna mess it up trying.
    I’m going to mess with it sometime this week, so hopefully someone has some insight.
    I’ll post up the results regardless.
     
  4. ROADSTER1927
    Joined: Feb 14, 2009
    Posts: 2,912

    ROADSTER1927
    Member

    I am pretty sure you have to take the Bezel off to do any service!
     

  5. cretin
    Joined: Oct 10, 2006
    Posts: 2,962

    cretin
    Member

    Well, I was able to open the tach by getting the plastic off the back of the gauge. it doesn’t look too good in there though. The needle is somehow just gone, which I don’t understand. And it looks like the mechanism is damaged.
    this is what I got out of it. It’s difficult to get a good photo of the mechanism, but hopefully it’s good enough for someone to see. Am I screwed here?

    image.jpg image.jpg image.jpg image.jpg
     
  6. Actually good pictures - was the pointer there at one time ? The face/football is held on by the two little screws so I would guess they backed off - maybe due to vibration ?
     
    cretin likes this.
  7. cretin
    Joined: Oct 10, 2006
    Posts: 2,962

    cretin
    Member

    Yea, the pointer was there. It was a perfectly functioning tach till it vibrated loose in there on Sunday.
    The two screws from the back were in the cup when I removed the tach. The rest pictured above is what came out when I opened the tach. Quite a bit shook loose. Maybe I’m driving too hard!
     
  8. big duece
    Joined: Jul 28, 2008
    Posts: 6,250

    big duece
    Member
    from kansas

    cretin likes this.
  9. Fogger
    Joined: Aug 18, 2007
    Posts: 1,564

    Fogger
    Member

    Check out. MoMa Manufacturing in Albuquerque, NM. I've had them repair and recalibrate all my S&W and Sun gauges since they were here in North Hollywood. Quick service and fair prices.
     
    cretin likes this.
  10. cretin
    Joined: Oct 10, 2006
    Posts: 2,962

    cretin
    Member

    Thanks guys, I'll check them out.
     

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