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PTL&PTA
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Joined: November 19, 2014
Posts: 18
Location: England
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 Posted: Fri Jul 31, 2015 1:06 am Post subject: Distributor Drive Pinion - Specs needed. |
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Searched but couldn't find the info.
What are the specs/measurements, allowable wear for the Distributor Drive Pinion(?)
(Hope I got the name right)
ANY information appreciated.
Thanks Guys/Gals
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kreemoweet
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Joined: March 13, 2008
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Location: Seattle, WA
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| Posted: Fri Jul 31, 2015 7:49 am Post subject: |
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There are no such specs. It would be a matter of mechanical common sense to judge whether any of the possible wear
areas are acceptable or not. Wear would be far more likely to occur on the surfaces the pinion interacts with, i.e., engine case
and brass crank gear.
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PTL&PTA
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Joined: November 19, 2014
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Location: England
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| Posted: Fri Jul 31, 2015 7:59 am Post subject: |
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Thanks Kreemoweet, I believe I have seen somewhere the pinion bore (in crankcase) has a max wear figure, but as you say "common sense". I did just wonder if there was such a figure - apparently not. I'm happy with that.
Thanks for a very speedy reply.
Just in passing, how far down in the drive end of the pinion should the distributor drive fit into the pinion? The wear pattern on mine seams to be all at the very top of the slot . . .
Curious.
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kreemoweet
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Joined: March 13, 2008
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Location: Seattle, WA
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| Posted: Fri Jul 31, 2015 12:58 pm Post subject: |
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Tom Wilson ("How to Rebuild Your Volkswagen Air-Cooled Engine") suggests .020 in. min to .050 in. max endplay, with
distributor, pinion, & bottom thrust washers installed, spring left out. Sounds quite reasonable to me. That "spec" would
indirectly give you the drive dog insertion depth in the pinion. If case is assembled with pinion already installed, the endplay
could be calculated from measurements of case-to-bottom-of-pinion-slot and bottom-of-dist-clamp-to-bottom-of-drive-dogs.
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PTL&PTA
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| Posted: Sat Aug 01, 2015 2:47 am Post subject: |
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Thanks again Kreemoweet!
Wilson's book was where I read that - thanks for the reminder 
I just examined the distributor clamp and noticed it is a "bit" bent . . .
I wonder if this was the probable cause of the distributor drive not seating deep enough.
The engine I have stripped is one I'm using in my "Learning Curve" and is sacrificial as far as any attempts made to mod/understand my new case (Brazilian - not bought yet, but soon). My Sacrificial Engine was as far as I am concerned a pretty good investment - but probably considered Sacrilege 
It's the way I learn.
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runamoc 
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Joined: June 19, 2006
Posts: 5601
Location: 37.5N 77.1W
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| Posted: Sun Aug 02, 2015 2:46 pm Post subject: |
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| Quote: |
| I just examined the distributor clamp and noticed it is a "bit" bent |
That means 'somebody' over tightened it. A few inch/pounds is all that's needed to keep it from moving. |
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kreemoweet
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Location: Seattle, WA
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| Posted: Sun Aug 02, 2015 5:24 pm Post subject: |
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A warped clamp could contribute to such a problem. Other things that are fairly common: missing washers (especially the "fiber" washer) under the dist. drive dog; missing
thrust washers under the drive pinion; some cases, especially rebuilt ones, sometimes had a deeper-than-normal drive pinion bore, and used spacers or just extra thrust
washers to make up for it.
A clamp that is bent could very well have stripped threads as well, could loosen in use and let the dist. pop up out of engagement with the pinion. The dist. has a few pounds of
upward force on it from the little spring in the pinion, so a good clamp is essential.
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PTL&PTA
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Location: England
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| Posted: Sun Aug 02, 2015 7:16 pm Post subject: |
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Thanks Guys.
Yes much of what was mentioned above "'somebody' over tightened it" etc, seemed to have happened to this distributor.
In particular "the "fiber" washer) under the dist. drive dog" - I don't remember there being one and I am pretty careful to bag 'n' tag items for later examination by Forensics 
Curiouser and curiouser. But Very Interesting!
Little bit more learned - Thanks.
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