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  #1  
Old 08-11-2020, 04:53 PM
t walgamuth's Avatar
dieselarchitect
 
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resurface ring and pinion gear

I have interest in buying a relatively rare ring and pinion gear for my Formula F car. The seller says it needs to be resurfaced. I have not heard of this being done to a ring and pinion gear....anybody able to illuminate the process for me please?

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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  #2  
Old 08-11-2020, 07:43 PM
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Would that be akin to grinding a cam? A pattern is needed for that. Maybe just micropolishing like a crankshaft? But a crank has flat surfaces the polishing tape can reach. I guess some online research is in order.
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  #3  
Old 08-11-2020, 09:22 PM
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I’ve never heard of that, but if there is enough room in the adjustment process, it might be plausible. On a third member like a nine inch Ford, you have adjusters that could turn quite a distance. I suppose you can add enough shims to those that are shimmed, but it might result in a force being cantilevered beyond its area of strength.

I‘m not a machinist so it’s difficult for me to comprehend how you would go about the process. I would think that it should not involve very much removal of material if it’s going to be successful.
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  #4  
Old 08-11-2020, 10:23 PM
t walgamuth's Avatar
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I talked to my favorite machinist, Homer. He says there could be just enough gear wear to require adjustment and re-lapping the faces so they mesh properly.

Also it could be rusty.

He is going to check with a local guy who used to do that and see if he still is.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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  #5  
Old 08-11-2020, 10:32 PM
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Yeah, if you could get a uniform surface it would help you see the pattern while setting it up too.
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  #6  
Old 08-11-2020, 10:57 PM
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I would have expected the pinion to be case hardened. But apparently, refinishing is a thing:

https://www.detroitspeed.com/gearfx-service-rem-deburr-and-micro-polish-ring-pinion-gear-070151
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  #7  
Old 08-12-2020, 01:29 AM
INSIDIOUS's Avatar
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nonsense. just get a hunk of titanium and take your diamond file to it. easy peasy - better than new!!
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  #8  
Old 08-12-2020, 08:06 AM
t walgamuth's Avatar
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Quote:
Originally Posted by Mxfrank View Post
I would have expected the pinion to be case hardened. But apparently, refinishing is a thing:

https://www.detroitspeed.com/gearfx-service-rem-deburr-and-micro-polish-ring-pinion-gear-070151
Thanks! That looked like they might be suggesting the treatment on brand new parts.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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  #9  
Old 08-13-2020, 04:26 PM
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Amazing & fascinating .

? What's the ring and pinion from originally ? .
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  #10  
Old 08-13-2020, 04:50 PM
t walgamuth's Avatar
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I'm not sure but may be a VW part.

The fellow offering a used part needing resurfacing discovered it is not the right gear ratio.....his is same as mine 3.1.

Drat!
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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  #11  
Old 08-13-2020, 06:00 PM
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If it’s a VW product you would think it could be found assuming that the ratio you need was produced.
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  #12  
Old 08-13-2020, 07:58 PM
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Diameter of ring? 3.1 is an unusual ratio...have you counted the teeth, or the number of output rotations per turn of the pinion?
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  #13  
Old 08-13-2020, 09:26 PM
vwnate1's Avatar
Diesel Dandy
 
Join Date: Nov 2005
Location: Sunny So. Cal. !
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Ring & Pinion Gears

In every one I've ever seen the ratio is stamped on both the edge of the ring gear and the nose of the pinion gear .

It's been a long time since I fooled with VW transaxles but VW made a bewildering array of ratios over the years so I imagine once you're counted the teeth and done the math it should be possible to contact say Rancho Transmission (Riverside, Ca. I *think*) and ask them to sell you a gear set .

Having worked on many a noisy final drive over the decades I'd think any rust no matter how slight would mean scrap time .

VW do Mexico still makes plenty of parts for old VW's, maybe find a copy of 'Dune Buggies And Hot VWs' magazine, they used to have a page in the back that told you on which page what product could be found, there's always lots of vendors .

Maybe SCAT in ?Hawthorne? Ca. ? they're still in theVW parts biz and are near the mall .

Good luck hunting, keep us posted please .
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-Nate
1982 240D stripper 393,000 miles
1984 300CD KEEPER ! 481,XXX miles
1984 Euro 300TD Fully optioned SWMBO's
1974 350SLC 4 speed SOLD & missed
Kooky Kommie Ural Motocycles (3)
BMW Moto R60/6 Barn Find, 8,000miles
1959 VW #113 DeLuxe Beetle, 36hp engine, stock
Junk, Rust, Arthritis, Crushed Spine,Broken Neck, Back & arm, lots of screws, pins & plates .
Memories, Peace Of Mind
facts & reality don't change because you can't handle them
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  #14  
Old 08-14-2020, 07:38 AM
t walgamuth's Avatar
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Thanks very much! The vw angle may end up being a good path.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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  #15  
Old 08-14-2020, 11:35 AM
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How is that 3:1 accomplished? 60 to 20? 30 to ten? Other possibles but tiny (12:4, 15:5)

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