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BobbyPaulk(at)comcast.net
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 Posted: Fri Feb 13, 2015 8:33 am Post subject: Up Date |
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While I was re-building the flywheel / coil / ignition area on the back of my engine I took my starter to a friend and owner of a starter / generator shop to have it cleaned, lubed and checked out. He said the bolts holding it together were loose and the armature had beat the bearings into the case and it was not rebuild-able. Both front and rear bearings had done so. The back side of the starter is Nippon-Denso and could be replaced but the front adapter is a Jabiru part. I am looking at welding and turning it back to specs.
It turns out after much study that the starter was key to my hard start problems from the get go. If it was dragging it would not turn the engine fast enough to fire the magnetos that do not have impulse couplings. ( 300 rpm ) So that sent me off in the direction I took to tighten the air gap between the magnets and the coils as some others have done with success to get a stronger spark. .
Although I had a 45 minute flight on it I apparently had set the gap a little too tight and on the second flight as the engine warmed up it caused the magnet retention bar to collide with the plates holding the coils. The two small screws holding one of the magnet retention bars sheared and pushed the coils away from the magnets which cut off the ignition causing the off field landing.
Please put the starter on your "Condition" inspection list or check it when you have the cowl off. My visual exam of the starter was to try to move it by hand and if it was snug I thought it was o.k. The bolts loosened somewhere between 220 hours and 239 on the hobbs causing the failure. I will make sure the bolts will have Loctite on them when they go back and check the torque on a regular basis.
I am re-placing the left coil with the Ro-Tec E-Mag and a friend who is doing the same is giving me his original left coil.
bobby
[quote][b]
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checkpoint3(at)comcast.ne
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| Posted: Fri Feb 13, 2015 9:34 am Post subject: Up Date |
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Thanks for the information, I’ll check it.
From: BobbyPaulk(at)comcast.net (BobbyPaulk(at)comcast.net)
Sent: Friday, February 13, 2015 11:33 AM
To: Server, JabiruEngine-List Digest (jabiruengine-list(at)matronics.com)
Subject: Up Date
List
While I was re-building the flywheel / coil / ignition area on the back of my engine I took my starter to a friend and owner of a starter / generator shop to have it cleaned, lubed and checked out. He said the bolts holding it together were loose and the armature had beat the bearings into the case and it was not rebuild-able. Both front and rear bearings had done so. The back side of the starter is Nippon-Denso and could be replaced but the front adapter is a Jabiru part. I am looking at welding and turning it back to specs.
It turns out after much study that the starter was key to my hard start problems from the get go. If it was dragging it would not turn the engine fast enough to fire the magnetos that do not have impulse couplings. ( 300 rpm ) So that sent me off in the direction I took to tighten the air gap between the magnets and the coils as some others have done with success to get a stronger spark. .
Although I had a 45 minute flight on it I apparently had set the gap a little too tight and on the second flight as the engine warmed up it caused the magnet retention bar to collide with the plates holding the coils. The two small screws holding one of the magnet retention bars sheared and pushed the coils away from the magnets which cut off the ignition causing the off field landing.
Please put the starter on your "Condition" inspection list or check it when you have the cowl off. My visual exam of the starter was to try to move it by hand and if it was snug I thought it was o.k. The bolts loosened somewhere between 220 hours and 239 on the hobbs causing the failure. I will make sure the bolts will have Loctite on them when they go back and check the torque on a regular basis.
I am re-placing the left coil with the Ro-Tec E-Mag and a friend who is doing the same is giving me his original left coil.
bobby
[quote]
href="http://www.matronics.com/Navigator?JabiruEngine-List">http://www.matronics.com/Navigator?JabiruEngine-List
href="http://forums.matronics.com">http://forums.matronics.com
href="http://www.matronics.com/contribution">http://www.matronics.com/c
[b]
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