VansAirForceForums  
Home > VansAirForceForums

-POSTING RULES
-Advertise in here!
- Today's Posts | Insert Pics

Keep VAF Going
Donate methods

Point your
camera app here
to donate fast.

  #1  
Old 06-17-2022, 07:01 PM
Jake14 Jake14 is offline
 
Join Date: May 2014
Location: Seattle
Posts: 411
Default alternator voltage drop

Just noticed this morning that my bus voltage with the engine running was 13.8 throughout the 1-hr flight. It's always been 14.3 - 14.4 for the 650 hours since new

Plane Power, internal regulator. Belt is tight. Is this a sign of impending failure?
should I just get a new one?
__________________
RV-14A flying 650 hrs
Reply With Quote
  #2  
Old 06-17-2022, 08:30 PM
Mich48041 Mich48041 is offline
 
Join Date: Apr 2008
Location: Riley TWP MI
Posts: 3,388
Default

Take the alternator "B" lead terminals apart and clean them and reassemble.
Make sure all charging system connections are clean and tight.
__________________
Joe Gores
RV-12 Flying
Reply With Quote
  #3  
Old 07-06-2022, 01:54 PM
Jake14 Jake14 is offline
 
Join Date: May 2014
Location: Seattle
Posts: 411
Default

went to check the connections like you said but it looks like it's throwing oil..so ordered a new one from AS $1249 with core charge.. !!!

Click image for larger version

Name:	IMG_2379.jpg
Views:	161
Size:	358.9 KB
ID:	27820
__________________
RV-14A flying 650 hrs
Reply With Quote
  #4  
Old 07-06-2022, 02:30 PM
Lycosaurus's Avatar
Lycosaurus Lycosaurus is offline
 
Join Date: Mar 2006
Location: Ottawa, ON
Posts: 688
Default There is no oil in an alternator

Quote:
Originally Posted by Jake14 View Post
went to check the connections like you said but it looks like it's throwing oil..so ordered a new one from AS $1249 with core charge.. !!!

Attachment 27820
IMHO... That is engine oil. The alternator brushes may be soaked in this oil, and might need a cleaning or replacement. Do not throw that alternator out, it may still have some life left.

You will need to hunt down the oil leak. If not fixed, the leak will possibly damage your new alternator in short order.
__________________
Alfio
RV-9A Ottawa, Canada
First flight Dec. 18, 2008
> 1,100 hrs tach.
Reply With Quote
  #5  
Old 07-06-2022, 04:56 PM
Larco's Avatar
Larco Larco is offline
 
Join Date: Mar 2005
Location: DVT Phoenix
Posts: 1,295
Default fixed the photo

As just said, no oil in Alternator.
Attached Thumbnails
Click image for larger version

Name:	IMG_2379.jpeg
Views:	113
Size:	363.3 KB
ID:	27826  
__________________
Larry
Reply With Quote
  #6  
Old 07-06-2022, 10:32 PM
Jake14 Jake14 is offline
 
Join Date: May 2014
Location: Seattle
Posts: 411
Default

Hmmm..of course ...I guess my first thought was that a bad bearing was causing the mess, but obviously not the case..thanks for the responses
__________________
RV-14A flying 650 hrs
Reply With Quote
  #7  
Old 07-07-2022, 05:29 AM
Gusmax Gusmax is offline
 
Join Date: Jun 2014
Location: Sherwood Park, Alberta
Posts: 105
Default

Feel the back side of the ring gear/flywheel, if there is oil, it will be your front crank seal leaking.
__________________
Phil Kite

F4 Raider project with RV-8 wings and tail
Reply With Quote
  #8  
Old 07-07-2022, 08:37 AM
bhester's Avatar
bhester bhester is offline
 
Join Date: Jan 2005
Location: Hopkinsville, KY
Posts: 1,067
Default Wow $1249

Really glad I'm using a Autozone Part# 14824 $80 alternator.
13 yrs and 1300 hrs on the first one. Over 150 hrs so far on the second one.
__________________
Bobby Hester - Builder/Pilot/A&P
Surfing the web from Hopkinsville, KY
N857BH RV7A XP-O360 - Garmin G3X ADS-B IN/OUT 2020 Compliant
Web site: http://www.newtech.com/bobbyhester/RVSite.htm
Dec. 2021 VAF donator - alot better than any magazine subscription

Last edited by bhester : 07-07-2022 at 09:55 AM.
Reply With Quote
  #9  
Old 07-07-2022, 08:29 PM
spatsch spatsch is offline
 
Join Date: Nov 2014
Location: Denison, TX
Posts: 364
Default

Quote:
Originally Posted by Jake14 View Post
went to check the connections like you said but it looks like it's throwing oil..so ordered a new one from AS $1249 with core charge.. !!!

Attachment 27820
You do know that a brand new alternator kit at Vans costs "only" 925$

https://store.vansaircraft.com/plane...or-deluxe.html

and you can keep the core. You also will get a belt, brackets and other stuff you won't need but still 324$ cheaper then going to Plane and Power and getting the "deal" with core credit ... .


Oliver
__________________
Oliver Spatscheck
RV-8 N-2EQ -- flying 500+ hours
Fokker DR-1 N-22EQ -- under construction
http://www.spatscheck.com/oliver
Reply With Quote
  #10  
Old 07-07-2022, 08:34 PM
wcalvert's Avatar
wcalvert wcalvert is online now
 
Join Date: Jan 2019
Location: Anacortes Wa
Posts: 464
Default

My IO-360 had a similar (but smaller) leak when new, but has since (180 hours) disappeared. That leads me to believe it was a front main seal settling in...

Just a guess, but mine stopped.
__________________
RV-7 Tipper
Bill (Wild) VA-165 '90-'93
Anacortes, Wa

First Flight 7/17/2021!! 200 hours 6/22
- Been there, Donated 2022

Last edited by wcalvert : 07-07-2022 at 08:35 PM. Reason: Saw the hours listed on an earlier post ...
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 01:30 PM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.