03-09-2003, 11:50 AM
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Senior Club Cobra Member
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Join Date: Sep 2000
Location: CA, USA,
Posts: 363
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Not Ranked
Rick and Lowell
My problem is my distributor drive gear is wearing. Lobes/lifters are OK to the best of my knowledge. I've read on this forum several times of dist drive gears failing and some of the possible reasons, mismatched gears, high pressure pumps, etc. I have not yet read about what I believe lead to my failure. I was going to post after I had a better look at the cam but here goes...........
I'm using a stock 1965 dist with a magnetic trigger for my MSD box. It never occured to me to check the distance from the bottom face of the dist drive gear to the flange on the dist that seats against the block. It turns out I am 0.020" too long. So my theory is I clamped the dist down forcing(sandwiching) the bottom face of the dist drive gear against the block. This caused a tremendous amount of drag and resulted in the premature wear of my dist drive gear. I have since replaced the dist drive gear and pinned it at the correct dimension and verified that I have end play on the shaft after it is installed and clamped down. I am now wearing my new gear and believe this is occuring because the cam gear is worn as a result of my first escapade and thus my need to replace the cam. With the dist out, a strong light and a dental mirror, I can discern some wear on the cam. I suspect that when it is removed and I can get a good luck at it things will appear worse.
I'll post as I learn more.
Steve Dickey
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