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Can Dry Film Lubes be used to tighten blower clearances


I retired from turning a wrench 6 years ago when I tore some muscles in my back and right pelvis, I now Supervise a Handicapped Maintenance and Cleaning Crew for the local Sheltered Workshop at an I-70 Rest Area here in Wright City, MO.

My current personal project is saving/rebuilding the small Magnuson straight rotor blower that I have had on my Harley since 1979. I spent some time on the phone with the current owner of the company and he told me that short of finding a new set of rotors (obsolete) I'm SOL.

I can adjust the rotor to rotor clearance by resetting the gears on the shafts.

The problem is the rotor to case clearance, I have .006" and I want to close that up to .002 , the wear was caused by rotor to rotor clash as the rotors loosened from their shafts, I will fix that by cross-drilling through the rotor and pinning the rotors to their shafts.

I am thinking of bead blasting the rotors and the case with steel shot to clean, texture and raise (?) the surfaces then I am hoping that a baked-on dry film lubricant could further raise my surfaces the .002 I need.

.002 on the rotors plus .002 inside the case could cut my rotor to case clearance down to the .002 that I want.

Is this a good plan?

What product (DFL) am I looking for and where can I find it?

Charles R Berg
mechanic (retired) - Wright City, Missouri, USA


I think you should talk to a brush plating specialist. Salvage and building up of worn parts is routinely done with nickel plating applied by brush plating method.

Ted Mooney, finishing.com
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey


We used to use wearaway coating to repair aluminium casing for oil pumps-check indestructable paint coating inc.-milfort. Good luck GOD BLESS.

Cair Shishani
Khair Shishani
aircraft maintenance - Al Ain, UAE

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