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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,
Ted Mooney, P.E.
Striving to live Aloha - 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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