Hewland Gearbox Vent Fitting
The brass vent in my Hewland end cover is loose. The threads in the aluminum have stripped due to use over the years during gearing changes. It is currently a oil pressure line fitting, so I don't have to unscrew the fitting from the rear cover. I could go to a larger fitting, but I'd rather not. Does anyone know of a better solution, maybe something with a locking nut for inside the cover?
Van Diemen RF 79 #? Van Deimen RF 78 #231
It's not how fast you go.
It's how well you go fast.
A "solution" is staring you in the face
Replace the fitting with an aluminum fitting welded in place.
or attached with some really good epoxy.
Plug it and drill a 1/16" hole in the cover over on that boss above the shift finger so oil isn't thrown at it by the rotating nuts. You win the prize for the most welded on rear cover for a Hewland, mind you...
Brian
I can't weld. I'd have to find someone to weld an aluminum fitting on it for me.
The boss above the shift finger looks as though it already had a vent hole, but has been filled in.
That's the way I got that cover. I do have a spare one. It has had some repairing done also, but looks better.
Last edited by AlanVDW; 09.17.14 at 7:52 PM.
Van Diemen RF 79 #? Van Deimen RF 78 #231
It's not how fast you go.
It's how well you go fast.
Since you aren't the one with the welder...
Remove the cover, clean it extremely well and JB weld (epoxy) the current plug in place. Let cure completely before you re-install.
The magic drug.Originally Posted by Daryl DeArman
CREW for Jeff 89 Reynard or Flag & Comm.
Some how JB Weld & the J.C. Whitney catalog just go together in my mind. I keep both in the same tool box drawer.
"An analog man living in a digital world"
There is also a Loctite thread restore goop that would work.
Brian
I figured out a solution after I looked at one of my fuel jugs. A used tire valve, a thin one w/o the core. One rubber grommet below the nut and washer. This is my spare cover with the vent hole in the boss above the shift finger.
Van Diemen RF 79 #? Van Deimen RF 78 #231
It's not how fast you go.
It's how well you go fast.
Great idea !
"An analog man living in a digital world"
Nice, what psi do you run in the Mk9?
I match the rear tire pressure for better balance.
Van Diemen RF 79 #? Van Deimen RF 78 #231
It's not how fast you go.
It's how well you go fast.
Be sure to use Nitrogen or Argon for minimal pressure growth!
Garey Guzman
FF #4 (Former Cal Club member, current Atlanta Region member)
https://redroadracing.com/ (includes Zink and Citation Registry)
https://www.thekentlives.com/ (includes information on the FF Kent engine, chassis and history)
No, use helium to shift weight to the front tires.Be sure to use Nitrogen or Argon for minimal pressure growth!
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