[TenTec] Lubricating Orion II Heat Sink Fan

Kim Elmore cw_de_n5op at sbcglobal.net
Sun Jul 14 17:35:44 EDT 2019

Although lots of time has passed, I wanted to let everyone know that I 
had no luck lubricating the old PA muffin fan on my Orion II. I tried 
everything everyone suggested and it simply got worse. It squealed quite 
loudly in the end.

These are 60 mm x 25 mm x 60 mm muffin fans and common as dirt. I had 
three in my one of my parts boxes, so I slapped in an old one and -- Lo! 
And behold! -- it was quiet. This one turns in the opposite direction, 
but that doesn't matter. I looked it up and, not only does it have ball 
bearings, but it moves even more air (27 cfm vs 25 cfm) and uses less 
current (0.14 A instead of 0.23 A). If yours wakes you up with a 
surprising squeal, get anything of the stated size with ball bearings 
and replace the old one! It's not worth your time to keep trying to 
resurrect the original one.

Kim N5OP

On 5/13/2019 2:01 PM, Stuart Rohre wrote:
> Kim had a great suggestion, which eases the application of new 
> lubricant to heat sink fans.?? Tilt the radio such that the central fan 
> bearing is pointing UP, before you heat up the fan to suck in new 
> lubricant on the cool down step.
> The Fans at Mouser are so good and reasonably priced, that getting a 
> new fan overnight is a most time saving step. Match the overall 
> dimensions with the old fan.?? The new fans have a ball bearing model.
> I have done the fan rejuvenation a number of times but last few 
> timees, I bouight new fans, and also rejuvenated the old one. That 
> way, I have plenty of spares for future use.
> Stuart Rohre
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Kim Elmore, Ph.D. (Adj. Assoc. Prof., OU School of Meteorology, CCM, PP 
SEL/MEL/Glider, N5OP, 2nd Class Radiotelegraph, GROL)

/"In theory there is no difference between theory and practice. But, in 
practice, there is." //??? Attributed to many people; it???s so true that it 
doesn???t matter who said it./

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