fbpx
Login

 

Jump to Forum..

912 smoothing capacitor

Category: 915iS Technical Questions one year ago
I'm having electrical probs on my light aircraft and seeking possible causes. I find the smoothing capacitor (22000 mfd, 25 volts) is not a nice cylindrical shape (was it ever?) but is roughly hexagonal in cross section in the centre section tapering to circular at the ends. Surely would not have started life like that??? If it is dead what would the symptoms be?
If dead, is it a Rotax part or after-market?
Suggestions welcome!
Jim
IMG_0798.JPG (You do not have access to download this file.)

  • Re: 912 smoothing capacitor

    by » one year ago

    The capacitor is an "Off The Shelf" Part. Nearly any 22,000uF, 25 volts cap will work.
    They are readily available for under $5.

    In the environment of an engine compartment. expect to replace it at least once every 10 years.
    The Electrolyte eventually dries out over the years.
    Capacitors are usually the reason that electronic devices eventually fail.

    It should have been round with flat ends when new.
    The failure mode is usually that it dries out, leaks Electrically, Gets Hot, Swells Up, and eventually blows its contents out the end cap making a mess.
    It sounds like yours is about to blow!

    The symptoms range from buzzing in the intercom, erratic voltage swings, Battery not charging to no symptoms at all depending on your specific wiring installation.

    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Bill.Hertzel@Yahoo.com
    Clicking the "Thank You" is Always Appreciated.

    Thank you said by: James Harris
      
    Report
You do not have permissions to reply to this topic.
Related Topics
Title Category Replies
912iS Lane A Light ON 912iS Technical Questions 1
912iS 915iS Training General Tech Discussion 8
912 ULS miss 912 / 914 Technical Questions 1
912 ULS, HARD START, ROUGH RUN 912 / 914 Technical Questions 18
Oil Leak 912 Casing Bolt 912 / 914 Technical Questions 9
Follow Us

Recent Videos

Safety First!

 

To receive critical-to-safety information on your ROTAX Engine, please subscribe to
ROTAX-OWNER.COM

ROTALK News



ROTALK NEWS Episode 5
Rotax-powered Sling aircraft from The Aircraft Factory, the AVMAP Navigation and engine monitoring system, and the Rotax powered Tucano Experimental and Light-Sport Aircraft.



ROTALK NEWS Episode 4
ROTAX's 915iS-powered Aquila A211 test aircraft, the Scheibe SF-25C Falke (first-ever 912-equipped aircraft!) and ROTAX factory in Gunskirchen, Austria.


ROTALK NEWS Episode 3
Michael Smith's Rotax-Powered Searey Circumnavigation, the amazing Rotax-Powered Lockwood Aircam and Anthony Caere's chimpanzee rescue operations.

Prize Giveaway!

Ad
SUBSCRIBE NOW
to automatically enter this years draw!

Login