Newowner Posted October 20, 2020 Report Share Posted October 20, 2020 1967 M20F. Have new starter new battery both new solenoids. When I’m trying to start it after shutting it down hear buzzing noise and no starter rotation, or very small ¼ turn rotation. After few attempts it’ll start turning. Not a problem when it’s cold. Did anyone had that problem? May be it’s high amperage wiring? Appreciate your inputs. Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
carusoam Posted October 20, 2020 Report Share Posted October 20, 2020 Sounds like the only thing left is cleaning connections... Done the proper way, should keep this problem from happening... Unless one of the new devices isn’t working like it is supposed to... PP thoughts only not a mechanic... Best regards, -a- Quote Link to comment Share on other sites More sharing options...
Ragsf15e Posted October 20, 2020 Report Share Posted October 20, 2020 4 hours ago, Newowner said: 1967 M20F. Have new starter new battery both new solenoids. When I’m trying to start it after shutting it down hear buzzing noise and no starter rotation, or very small ¼ turn rotation. After few attempts it’ll start turning. Not a problem when it’s cold. Did anyone had that problem? May be it’s high amperage wiring? Appreciate your inputs. Sent from my iPhone using Tapatalk Well the buzzing is probably good as that is likely the shower of sparks. That buzzing should only happen during a start with the key in the start position and it’s usually hard to hear if you don’t pause in the start position before pressing the key. If that’s the buzz you hear, it’s normal. The not turning over is not so good. Doing this warm doesn’t add anything for me. I’d be troubleshooting electrical... maybe before/after starter solenoid all the way to starter. Does cockpit power seem normal during these episodes or do lights dim? Actually, check the engine ground and make sure everything is grounded really well. You can have a power wire but you need a solid ground at the starter to complete the circuit. Quote Link to comment Share on other sites More sharing options...
Newowner Posted October 20, 2020 Author Report Share Posted October 20, 2020 Thanks. I’ll do that. Was wondering what was making that buzzing sound... got to be solenoid. Also it didn’t happened when plane is cold, only after shutdown and restart. Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
Newowner Posted October 20, 2020 Author Report Share Posted October 20, 2020 Power stays normal... it’s brand new battery. And I thing buzzing sound coming ether from starter or solenoid which were replaced less then a year ago. I’m thinking it’s wires might be corroded. Don’t know why it’s only happening when plane is hot. Cold start is normal. Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
Guest Posted October 20, 2020 Report Share Posted October 20, 2020 The buzzing sound is normally the shower of sparks box, behind the instrument panel. The Skytec starter website has some troubleshooting tips which apply regardless of the installed starter. https://skytec.aero/aircraft-starter-performance-issues/ Clarence Quote Link to comment Share on other sites More sharing options...
Ragsf15e Posted October 20, 2020 Report Share Posted October 20, 2020 18 minutes ago, Newowner said: Power stays normal... it’s brand new battery. And I thing buzzing sound coming ether from starter or solenoid which were replaced less then a year ago. I’m thinking it’s wires might be corroded. Don’t know why it’s only happening when plane is hot. Cold start is normal. Sent from my iPhone using Tapatalk Next time you start the plane, turn the switch to start but don’t push yet. You should hear a buzz. That’s the shower of sparks which works in concert with your left mag to start the engine. If you’re hearing a different buzz, then maybe it’s part of the issue, but the sos buzz is normal and required. Quote Link to comment Share on other sites More sharing options...
Newowner Posted October 20, 2020 Author Report Share Posted October 20, 2020 Thanks for all your advises. Bussing sound only comes when I push the key to start. For sure it’s not shower of sparks. I’m thinking it might be solenoid since I don’t think starter has one. Sent from my iPhone using Tapatalk 1 Quote Link to comment Share on other sites More sharing options...
Ragsf15e Posted October 21, 2020 Report Share Posted October 21, 2020 1 hour ago, Newowner said: Thanks for all your advises. Bussing sound only comes when I push the key to start. For sure it’s not shower of sparks. I’m thinking it might be solenoid since I don’t think starter has one. Sent from my iPhone using Tapatalk Yeah, that makes sense. The troubleshooting guide Doc suggested leads through a nice step by step diagnosis. Making sure the engine ground strap is there and properly connected is a pretty easy quick check. Quote Link to comment Share on other sites More sharing options...
Guest Posted October 21, 2020 Report Share Posted October 21, 2020 Here’s the wiring schematic for your plane, it may be helpful. Clarence Quote Link to comment Share on other sites More sharing options...
carusoam Posted October 21, 2020 Report Share Posted October 21, 2020 New message for @Newowner, fresh from the doc... ^^^^ -a- Quote Link to comment Share on other sites More sharing options...
Newowner Posted October 21, 2020 Author Report Share Posted October 21, 2020 Trying to locate grounding strap to the engine. Anybody know where it should be?Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
Culver LFA Posted October 21, 2020 Report Share Posted October 21, 2020 12 minutes ago, Newowner said: Trying to locate grounding strap to the engine. Anybody know where it should be? Sent from my iPhone using Tapatalk Braided cable from the top of the right side/co-pilot foot well to the accessory case of the engine (If I remember correctly, mine goes to one of the studs for the gov. adapter plate) Quote Link to comment Share on other sites More sharing options...
Newowner Posted October 21, 2020 Author Report Share Posted October 21, 2020 Found it. Thank youSent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
Newowner Posted October 21, 2020 Author Report Share Posted October 21, 2020 Attachment point of grounding strap to the firewall was little loose. Should it be very tight? Hope that was a problem. Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
Guest Posted October 22, 2020 Report Share Posted October 22, 2020 5 hours ago, Newowner said: Attachment point of grounding strap to the firewall was little loose. Should it be very tight? Hope that was a problem. Sent from my iPhone using Tapatalk I’d remove it and clean the contact surfaces at both ends before reinstalling it. Torque to the specs for the size of fastener. Clarence Quote Link to comment Share on other sites More sharing options...
carusoam Posted October 22, 2020 Report Share Posted October 22, 2020 For electrons to bridge the gap... Clean surfaces, and torqued fasteners are good... If it was loose, that would be a sign that you most likely found the grounding problem... PP thoughts only, not a mechanic... Best regards, -a- Quote Link to comment Share on other sites More sharing options...
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