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08-23-2020, 03:14 PM
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Join Date: Apr 2006
Location: Fountain Hills, arizona
Posts: 116
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Timing the Magnetos
hello, trying to time the magnetos on my new YIO390-Exp engine, it appears to have the 20 deg mark down by the starter motor, i have never seen this before, on other older lycoming engines, it's 12:00 at the case split line. Is the flywheel installed wrong? If the timing mark is at the starter, there isn't any clear alignment marking. lost?  |
08-23-2020, 03:30 PM
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Super Moderator
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Join Date: May 2005
Location: Locust Grove, GA
Posts: 2,624
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Look for a tiny hole on the starter that should align with the 20-degree mark on the flywheel. You will have to look past the flywheel right at the starter.
Vic
__________________
 Vic Syracuse
Built RV-4, RV-6, 2-RV-10's, RV-7A, RV-8, Prescott Pusher, Kitfox Model II, Kitfox Speedster, Kitfox 7 Super Sport, Just Superstol, DAR, A&P/IA, EAA Tech Counselor/Flight Advisor, CFII-ASMEL/ASES
Kitplanes "Unairworthy" monthly feature
EAA Sport Aviation "Checkpoints" column
EAA Homebuilt Council Chair/member EAA BOD
Author "Pre-Buy Guide for Amateur-Built Aircraft"
www.Baselegaviation.com
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08-23-2020, 03:44 PM
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Join Date: Jan 2005
Location: Georgetown, TX
Posts: 396
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AND use the front markings with the starter hole and the rear (of the flywheel) markings with the case split...
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Deene Ogden.
N399AD RV-12...flying
N299AD RV8 QB, IO-390X, BA prop...SOLD
N199AD One Design...SOLD
N99AD BD4, flew for 22 years...SOLD
EAA Tech Counselor/Flight Advisor
CFII, MEI, CFIG
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08-23-2020, 03:48 PM
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Join Date: Nov 2012
Location: Gilbert, AZ
Posts: 124
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FFZ?
If you are building at FFZ let me know can stop by and help out. Or make sure #1 is on compression, bring to TDC the look for timing marks by starter. Then back up prop 20 degrees that should be a good starting point
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08-23-2020, 05:30 PM
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Join Date: Nov 2007
Location: Yarmouth, Nova Scotia
Posts: 2,405
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I use a small drill bit that fits tight in the hole to bring the point closer to the flywheel marks , for more accurate locating.
Don't forget the drill bit when you are done.
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Thanks Ron
RV-10 SOLD
RV-14 Flying
AirCam flying
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08-24-2020, 04:05 AM
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Join Date: Jun 2011
Location: Sydney, Australia
Posts: 56
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Make sure you are using the figures of the REAR of the Flywheel not figures on the front, and line that up with the crankcase.
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Chad Boot
RV8 Empennage in progress
RV14 140331 VH-VNX. Flying/Sold Winner Concourse D?Elegance SAAA Narromine 2018
RV10 Standard Fuselage Complete
RV10 Empennage complete
RV-7 Slider Flying VH-VNZ
Sports Aircraft Assn Australia. Tech Councillor.
2020 Dues Paid
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08-24-2020, 06:22 AM
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Join Date: Sep 2018
Location: Eatonton, GA
Posts: 180
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Quote:
Originally Posted by Ron B.
Don't forget the drill bit when you are done.
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BTDT. Now have a piece of drill bit stuck in the hole and no way that I know to get it out.
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Jim Bedsole
N62MG - RV-6A "Promises" - bought flying
Dues Paid
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08-24-2020, 06:58 AM
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Join Date: Mar 2005
Location: Dallas area
Posts: 10,761
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Quote:
Originally Posted by FlyingBanker
BTDT. Now have a piece of drill bit stuck in the hole and no way that I know to get it out.
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If you can't get it out with pliers, break off the back side and drive the remainder through with a small punch.
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Mel Asberry, DAR since the last century.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
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08-24-2020, 09:37 AM
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Join Date: Nov 2007
Location: Yarmouth, Nova Scotia
Posts: 2,405
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Not tight enough that you need to hammer it in. In with fingers , out with figures, never had a problem.
Should be able to clamp vice grips and lightly hammer on the vise grips to tap it out.
__________________
Thanks Ron
RV-10 SOLD
RV-14 Flying
AirCam flying
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08-24-2020, 10:11 AM
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Join Date: Mar 2007
Location: Sonoma County
Posts: 3,821
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Quote:
Originally Posted by Ron B.
I use a small drill bit that fits tight in the hole to bring the point closer to the flywheel marks , for more accurate locating.
Don't forget the drill bit when you are done.
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That would be a 1/16" bit..... goes in and out by hand.
__________________
VAF #897 Warren Moretti
2019 =VAF= Dues PAID
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