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Thread: Capacitor Replacement

  1. 04-13-2018, 02:09 PM #1
    Eddie Foy
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    Capacitor Replacement

    This is for you Webb. The capacitor in the photo was wired from the alternator output (A) to ground. I assume it was to filter noise. My meter say 6 nF. Does that sound right. What is the typical value and where is a good place to get a new one.

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  2. 04-13-2018, 02:30 PM #2
    Eddie Foy
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    Looks like the Cessna part is S1915-1. Can't see spending $80 for one. What is the Farad rating of the Cessna piece?
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  3. 04-13-2018, 03:51 PM #3
    wireweinie
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    Yikes. $80 dollars is on the low side!
    This is just a filter capacitor and the S-1915-1 part number comes up as installed as per an SB. Even if you leave it off, the charging system will still work. I'm not finding a spec on it, on line. Possible a spec may be ink stamped on a new one if you can get eyes on. I've seen various values on these filters but my opinion is that the 6 nf is a good reading. If you need to replace it with something cheaper, do a search for part number 63897-006.

    Web
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  4. 04-13-2018, 05:44 PM #4
    Eddie Foy
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    I will clean it up and re-install it. If I have radio noise I will deal with it. My vhf is a Garmin 225. I think they have pretty good internal noise filtering.
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  5. 04-13-2018, 05:45 PM #5
    irishfield
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    I THINK I still have some of those. I had a whole box of them at one point. Will try to remember to look tomorrow...
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  6. 04-14-2018, 10:26 AM #6
    airChris
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    Quote Originally Posted by wireweinie View Post
    I'm not finding a spec on it, on line. Possible a spec may be ink stamped on a new one if you can get eyes on.
    Lonestar Aviation makes a PMA approved replacement for the Cessna part - I have one at the hangar and can look up the spec next time I'm down there.

    Chris
    Last edited by airChris; 04-14-2018 at 10:38 AM.
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  7. 04-14-2018, 06:14 PM #7
    irishfield
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    Sorry Eddie, just got out of the plow truck and a little preoccupied. Just got 18" of snow and in the early am it is going to switch to 16 hours straight of freezing rain. I will try to get in the hangar tomorrow to look..
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  8. 04-15-2018, 11:41 AM #8
    irishfield
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    Eddie, I have an OE Cessna S1915-1 (one in the middle) that someone recrimped a connector on the wire and a few brand new replacements that are the same, made by same company, etc but different part number. 6.0 MFD rated at 150VDC and 100*C

    $30US + postage from L9M2C1 if you want either...or anyone else for that matter, I have a few.

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    Wayne
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  9. 04-19-2018, 09:24 AM #9
    irishfield
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    I guess you don't need this Eddie...
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  10. 04-20-2018, 04:50 PM #10
    irishfield
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    Well I guess I'll put the box back on the hangar parts shelf...
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  11. 04-20-2018, 04:52 PM #11
    Eddie Foy
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    Sorry, I didn't see your reply. I appreciate the effort but I think the one I have is still good.


    Quote Originally Posted by irishfield View Post
    Well I guess I'll put the box back on the hangar parts shelf...
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  12. 04-20-2018, 07:33 PM #12
    BC12D-4-85
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    FYI re alt filter caps: https://www.avweb.com/news/maint/182896-1.html

    Gary
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  13. 04-20-2018, 07:46 PM #13
    Tom3holer
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    Just go to a auto alternator repair shop and I bet they have a bunch of them for a few bucks.
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