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If you add a "luber" to the air system it must be compatible with the 'O'-rings and seals in the system especially the "brake booster" or you will have problems. No truck or bus that uses air brakes or air-assist brakes has ever had a "luber" on the air-system for this very reason. I agree with the water-separator ( I have a Bendix AD9 on mine) but I would never install a "oil luber" on it.
Remember though, your breathing in that oil mist from the wipers. I had a fellow mechanic who got lung damage due to the oil mist from draining the ping tanks on the buses. That is just from the air-compressor oil leaking into the air system. Of course that guy was a nut for breathing in that stuff in the first place. I mean come on, you can see the oil in the mist ! That should tell any sane person to hold your breath !
. Maybe that's why I'm like I am. Hear ya 5 by 5 about the oil in the exhaust but where I'm planning to go it doesn't rain all that much so I suspect I'll probably succumb to Tequila Sunrise before oil induced pulmonosis.
I suppose you can use the alcohol to clean off the oily windshields also !Brother, I've been holding my breath for forty long years.
First off what year is your truck ? That tells us which model wiper motor you have. Second the seals in the early deuce wiper motors will dry out. You will have to take it apart and clean out all that dried-up old grease and reapply some nice clean lube. I prefer silicone grease here. My bad, I see you already replaced the wiper motors. Well the air wiper "switch" can get gummed up. It too will need to be taken apart and cleaned. I actually had "grit" in my air switch ! Now with my new "wet" tank and Bendix AD9 air-dryer I no longer have those problems. I see you also replaced the air lines. That's a good start. Rubber hoses have a life of only ten years, so most of our trucks need new hoses. Yes they still work usually, but they are disintegrating due to age and exposer to sun and oxygen. I personally would lean towards your wiper switch being gummed up.
See, I knew it was that silly switch ! OK it wasn't gummed up, but that switch is the cause of a lot of wiper problems.I have found the solution fellas!!! That knob that turns your air wipers on... take and remove it loosening those 2 set screws...then you will be able to turn that knob without the knob just a bit or more more! things should start working the lil set screw in the center of that knob can also be adjusted and woohoo!!! doggone thing works like a charm!!! take and then place that knob back on and tighten those set screws.
Oh and Rusty thanks truck is an '83 M201A now converted to M818.
