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recapen(at)earthlink.net
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 Posted: Tue Feb 05, 2013 5:09 am Post subject: SD-20 Alternator / SB1B-14 regulator failure modes |
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Looking to see if anyone has ever experienced a failure of either of these two types of units. This is a backup unit be design so a failure might not get noticed - until you need it. My start-up checklist has me powering on the backup unit first, checking for amps generated and the warning light on...then power up the primary unit - I get more amps and the secondary light goes out...
Not looking to bad-mouth anyone.....my back-up alternator did not come on-line during my start-up checklist. No biggie - I was going on a local VFR fun flight close enough to get back to home-plate if necessary. Anyone experienced anything with theirs - how did it present? what was the cause? How did you determine / diagnose? What did you do to repair?
My line of troubleshooting thinking has me first checking to make sure the unit turns when the engine turns - then looking at the two ckt breakers and finally testing for current at the field wire on the back of the alternator.
Thanks,
Ralph Capen
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carl.froehlich(at)verizon
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| Posted: Tue Feb 05, 2013 7:32 am Post subject: SD-20 Alternator / SB1B-14 regulator failure modes |
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Yep - had a neighbor with a failed unit on his 360 Lancair. After troubleshooting a mess of wiring, I told him to pull the alternator for bench testing. Turns out the alternator rotor shaft sheared at the coupling to the accessory drive gear. I think I remember this being a phenolic piece - but I could be wrong.
When are you going to swing by Dogwood?
Carl
On Feb 5, 2013, at 8:08 AM, "Ralph E. Capen" <recapen(at)earthlink.net> wrote:
| Quote: |
Looking to see if anyone has ever experienced a failure of either of these two types of units. This is a backup unit be design so a failure might not get noticed - until you need it. My start-up checklist has me powering on the backup unit first, checking for amps generated and the warning light on...then power up the primary unit - I get more amps and the secondary light goes out...
Not looking to bad-mouth anyone.....my back-up alternator did not come on-line during my start-up checklist. No biggie - I was going on a local VFR fun flight close enough to get back to home-plate if necessary. Anyone experienced anything with theirs - how did it present? what was the cause? How did you determine / diagnose? What did you do to repair?
My line of troubleshooting thinking has me first checking to make sure the unit turns when the engine turns - then looking at the two ckt breakers and finally testing for current at the field wire on the back of the alternator.
Thanks,
Ralph Capen
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Larry Bowen
Joined: 09 Jan 2006
Posts: 802
Location: NC, USA
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| Posted: Tue Feb 05, 2013 7:32 am Post subject: SD-20 Alternator / SB1B-14 regulator failure modes |
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The one failure I happen to see was when I could turn the unit by hand. I could feel some resistance from the magnets, but not much else. I don't know the final diagnosis of that unit.
On Tuesday, February 5, 2013, Ralph E. Capen wrote:
| Quote: | --> RV-List message posted by: "Ralph E. Capen" <[url=javascript:;]recapen(at)earthlink.net[/url]>
Looking to see if anyone has ever experienced a failure of either of these two types of units. This is a backup unit be design so a failure might not get noticed - until you need it. My start-up checklist has me powering on the backup unit first, checking for amps generated and the warning light on...then power up the primary unit - I get more amps and the secondary light goes out...
Not looking to bad-mouth anyone.....my back-up alternator did not come on-line during my start-up checklist. No biggie - I was going on a local VFR fun flight close enough to get back to home-plate if necessary. Anyone experienced anything with theirs - how did it present? what was the cause? How did you determine / diagnose? What did you do to repair?
My line of troubleshooting thinking has me first checking to make sure the unit turns when the engine turns - then looking at the two ckt breakers and finally testing for current at the field wire on the back of the alternator.
Thanks,
Ralph Capen
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Larry Bowen
Larry(at)BowenAero.com
http://BowenAero.com
[quote][b]
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Larry Bowen
RV-8 SOLD,
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recapen(at)earthlink.net
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| Posted: Tue Feb 05, 2013 7:59 am Post subject: SD-20 Alternator / SB1B-14 regulator failure modes |
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Thanks - the shaft is not metal (IIRC) and is my first step in the diagnostics (after checking the two ckt breakers).
Still trying to get my engine re-broke-in. The back-up alternator is keeping me in VMC and within battery-distance to homeplate for now. You're a short hop (over the bay and Pax River) so it's near the top of my list.....
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recapen(at)earthlink.net
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| Posted: Mon Feb 11, 2013 12:03 pm Post subject: SD-20 Alternator / SB1B-14 regulator failure modes |
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As a follow up to my recent failure.
The issue ended up being the gear coupling in the alternator.
The gear coupling is a field replaceable item and I have one on the way.
More when it happens....
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