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Old 07-02-2006, 03:06 PM
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Join Date: Jan 2006
Posts: 32
A/C Blower Motor brushes replaced - now noisy

I replaced the brushes in my climate control blower motor recently with the kit from ************** and now it squeals. The loud squealing comes and goes and is caused by the bushings in motor.

My question is, what should you lube the motor bushings with? I used a R/C car motor bearing oil when i replaced the brushes. This seems to have attracted tiny contaminents and causes noise when motor is spinning.

Should it be a dry lube?

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Old 07-02-2006, 05:13 PM
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Join Date: Dec 2003
Location: Metro Detroit, Michigan
Posts: 17,357
Smile Answer

Any standard SAE 30 or 10W 30 through 50 works.
On rare occasions I have used 90W gear oil to extend the life of very bad bushings (personal cars only).

Remove the squirrel cages to fully access your bushings, it takes time for the thicker oil to penetrate as you are lubing the bushings, (roughly five to seven minutes of exercise to work in).

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Old 07-02-2006, 05:46 PM
Join Date: Jan 2003
Location: Florida
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OK, have heard ATF works best and does not soften the insulation on the commutator
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Old 07-02-2006, 07:20 PM
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Join Date: Dec 2000
Location: Battle Ground, WA
Posts: 576
I work on small equipment all the time, and a few years ago I started using 2 cycle synthetic chain saw lube for all the smaller bushings and bearings. It seems to not dry out as fast, and also doesn't make as much black deposit on the bushing. Works for me!

Richard Wooldridge
'01 ML320
'82 300D 4.3L V6/T700R4 conversion
'82 380SL, '86 560SL engine/trans. installed
'79 450SL, digital servo update
'75 280C
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