 Fresh air fan noise? SOLVED!, No noise anymore... |
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| larss |
 Sep 27 2010, 10:56 PM
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#1
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Member  Group: Members Posts: 428 Joined: 10-September 09 From: Sweden Member No.: 10,787 Region Association: Scandinavia  |
My 914 -72 fresh air fan has a quite high sound level, it hums and snarls at all speeds but most on high speed of course. Some vibrations can also be felt inside the car.
Have checked the fan bearings for play (which seemed close to 0) and also lubricated them.The fan wheel balancing weights seems to be in place. The noise is far better when the fan assembly is on the bench, guess the car body acts as a megaphone. What noise level should I expect from an OK fresh air fan? /Lars S |
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| McMark |
Sep 27 2010, 11:17 PM
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#2
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914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
I don't find the fresh air fan to be terribly loud. The plastic of the fan is often brittle and can break between the blades and the top ring. These cracks can cause imbalances, or slight rubbings that can increase the volume. It sounds like you've had it apart already, so I'm guessing the usual leaves and detritus has been cleaned out.
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| jim_hoyland |
Sep 28 2010, 08:17 AM
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#3
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Get that VIN ? Group: Members Posts: 9,303 Joined: 1-May 03 From: Sunset Beach, CA Member No.: 643 Region Association: Southern California 
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My fan noise levels:
Low: Barely hear with engine off Med: Barely hear at idle High: Noticable when driving if radio is off. It's been said a 911 fresh air blower was a better unit ?? Anything to this ? |
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| Cap'n Krusty |
Sep 28 2010, 08:32 AM
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#4
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Cap'n Krusty Group: Members Posts: 10,794 Joined: 24-June 04 From: Santa Maria, CA Member No.: 2,246 Region Association: Central California |
QUOTE(jim_hoyland @ Sep 28 2010, 07:17 AM)  My fan noise levels: Low: Barely hear with engine off Med: Barely hear at idle High: Noticable when driving if radio is off. It's been said a 911 fresh air blower was a better unit ?? Anything to this ? IIRC, the 914 and 911 fans are the same units. The Cap'n |
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| larss |
Sep 28 2010, 11:33 AM
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#5
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Member Group: Members Posts: 428 Joined: 10-September 09 From: Sweden Member No.: 10,787 Region Association: Scandinavia |
Thanks everyone, I will take it apart once again and examine the fan wheel....
What years should the 911 fan fit the 914? (exept for 70-75 of course) /Lars S |
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| Drums66 |
Sep 28 2010, 12:13 PM
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#6
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914 Rudiments Group: Members Posts: 5,321 Joined: 15-January 03 From: Coronado,Cali Member No.: 151 Region Association: Southwest Region |
QUOTE(larss @ Sep 27 2010, 09:56 PM) My 914 -72 fresh air fan has a quite high sound level, it hums and snarls at all speeds but most on high speed of course. Some vibrations can also be felt inside the car. Have checked the fan bearings for play (which seemed close to 0) and also lubricated them.The fan wheel balancing weights seems to be in place. The noise is far better when the fan assembly is on the bench, guess the car body acts as a megaphone. What noise level should I expect from an OK fresh air fan? /Lars S ....Turn the stereo up!!....it is what it is. (IMG:style_emoticons/default/laugh.gif) (IMG:style_emoticons/default/poke.gif) (maybe cause I don't use it!!) (IMG:style_emoticons/default/yellowsleep[1].gif) (IMG:style_emoticons/default/yellowsleep[1].gif) (IMG:style_emoticons/default/yellowsleep[1].gif) (IMG:style_emoticons/default/yellowsleep[1].gif) (IMG:style_emoticons/default/bye1.gif) |
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| larss |
Sep 29 2010, 12:38 PM
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#7
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Member Group: Members Posts: 428 Joined: 10-September 09 From: Sweden Member No.: 10,787 Region Association: Scandinavia |
Problem solved!
The fan bearing holders (in felt/rubber) had become very sloppy making the rotor fall down to a position where the fan wheel could touch the ring and also the collector end rested on the lower bearing. Replaced both holders with O-rings and the noise is gone! (IMG:style_emoticons/default/smile.gif) Before (IMG:http://www.914world.com/bbs2/uploads_offsite/www.lsmteknik.se-10787-1285785497.1.jpg) after (IMG:http://www.914world.com/bbs2/uploads_offsite/www.lsmteknik.se-10787-1285785501.2.jpg) (IMG:http://www.914world.com/bbs2/uploads_offsite/www.lsmteknik.se-10787-1285785508.3.jpg) /Lars S |
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