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07-15-2016, 03:22 PM
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Join Date: Apr 2008
Location: Stockholm, Sweden
Posts: 164
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Slick magneto timing
I'm trying to time my 4370/1 Slick magnetos. These have been running on the engine before I purchased it so I'm confident they are OK. I use a timing device with two LEDs and when the points open the lights come on but the lights are out all the time which seems to indicate that the points never open. I disonnected the ignition switch wire from one P-lead and tried it but it was the same. I have timed Bendix magnetos many times and this should not be any different. Am I overlooking something here?
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Hans Str?hle
Jodel sold (SE-XEV)
RV-4, flying any day (SE-XJJ)
F?rentuna, Stockholm
Sweden
EAA222
2020 =VAF= $20 donation paid
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07-15-2016, 03:29 PM
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Join Date: Aug 2009
Location: Newport, RI
Posts: 705
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Timing
Did you put the ignition switch to both?
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Al Girard, Newport, RI
N339AG
RV-9
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07-15-2016, 05:24 PM
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Join Date: Dec 2011
Location: Livermore, CA
Posts: 6,767
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Double check that the box is getting power and a good ground.
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07-15-2016, 11:17 PM
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Join Date: Apr 2008
Location: California
Posts: 652
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What Bob said... Is there a known good battery in the box? Mine has red/green LEDs so I know if it has power.
Don
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RV-8 QB Titan ECi 191HP XIO-360
WW200RV Dynon D180 HS34 AP74
GNS430 SL30 GTX327 PS8000B Uavionix Echouat
"Pilots are alchemists... we turn gold into lead."
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07-16-2016, 01:44 PM
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Join Date: Apr 2008
Location: Stockholm, Sweden
Posts: 164
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Quote:
Originally Posted by cfiidon
What Bob said... Is there a known good battery in the box? Mine has red/green LEDs so I know if it has power.
Don
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My box runs off the aircraft battery and it's good. I disconnected the P-lead of one magneto and connected directly to it and there is no change. Can it be anything else than a worn cam in the magneto?
__________________
Hans Str?hle
Jodel sold (SE-XEV)
RV-4, flying any day (SE-XJJ)
F?rentuna, Stockholm
Sweden
EAA222
2020 =VAF= $20 donation paid
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07-16-2016, 03:07 PM
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Senior Curmudgeon
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,408
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Couple of ideas??
Quote:
Originally Posted by hcccs
I disconnected the P-lead of one magneto and connected directly to it and there is no change. Can it be anything else than a worn cam in the magneto?
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These come to mind-----
Bad wire from the external connection to the points/condenser.
Bad insulator at the external connection.
__________________
Mike Starkey
VAF 909
Rv-10, N210LM.
Flying as of 12/4/2010 
Phase 1 done, 2/4/2011
Sold after 240+ wonderful hours of flight.
"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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07-16-2016, 04:27 PM
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Join Date: Nov 2005
Location: Asheville, NC
Posts: 2,690
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I am curious. You say your mag timing light has two LEDs.
Mine does too. Would it be the following unit, like mine?
If so, it has an internal 9V battery. Unit will not work with low battery.
__________________
Bill Pendergrass
ME/AE '82
RV-7A: Flying since April 15, 2012. 850 hrs
YIO-360-M1B, mags, CS, GRT EX and WS H1s & A/P, Navworx
Unpainted, polished....kinda'... Eyeballin' vinyl really hard.
Yeah. The boss got a Silhouette Cameo 4 Xmas 2019.
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08-25-2016, 08:51 AM
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Join Date: Apr 2008
Location: Stockholm, Sweden
Posts: 164
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Quote:
Originally Posted by hcccs
My box runs off the aircraft battery and it's good. I disconnected the P-lead of one magneto and connected directly to it and there is no change. Can it be anything else than a worn cam in the magneto?
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Faulty box. I borrowed another one and now all is OK.
__________________
Hans Str?hle
Jodel sold (SE-XEV)
RV-4, flying any day (SE-XJJ)
F?rentuna, Stockholm
Sweden
EAA222
2020 =VAF= $20 donation paid
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08-25-2016, 05:09 PM
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Join Date: Sep 2008
Location: California
Posts: 697
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Quote:
Originally Posted by rzbill
I am curious. You say your mag timing light has two LEDs.
Mine does too. Would it be the following unit, like mine?
If so, it has an internal 9V battery. Unit will not work with low battery. |
Also, as infrequently as we use these, take the battery out so it doesn't gum up like they do when left long periods....my A&P turned me on to that gem when I bought a new one. |
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