C2 tach -- Mechanical Engineer's perspective?
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Safety Car
Joined: Feb 1999
Posts: 3,504
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From: Mexico Beach FL
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For years I have wondered about the design of the distributor tach drive on my C2.
It would be nice to hear a Mechanical Engineer's view of this.
From what I see, the tach driven gear has a thrust washer on the side that mates to the brass bushing screwed into the distributor housing -- but, that is not the side of the gear that takes the thrust. The nose of the driven gear is pushed into the housing of the distributor by the rotation of the distributor. On my car, this eventually caused the driven gear to "lock up" and destroy both the driven gear and the distributor shaft/gear. I'm told this is a common occurrance.
It seems to me the thrust should be applied to the side with the thrust washer. Was this just a mistake by the people that designed it, or is there a logical reason (that I am missing) for this design?
Tom Piper
For years I have wondered about the design of the distributor tach drive on my C2.
It would be nice to hear a Mechanical Engineer's view of this.
From what I see, the tach driven gear has a thrust washer on the side that mates to the brass bushing screwed into the distributor housing -- but, that is not the side of the gear that takes the thrust. The nose of the driven gear is pushed into the housing of the distributor by the rotation of the distributor. On my car, this eventually caused the driven gear to "lock up" and destroy both the driven gear and the distributor shaft/gear. I'm told this is a common occurrance.
It seems to me the thrust should be applied to the side with the thrust washer. Was this just a mistake by the people that designed it, or is there a logical reason (that I am missing) for this design?
Tom Piper
Last edited by Tom Piper; Sep 14, 2005 at 07:30 AM.
