---------------------------------------------------------- Continental-List Digest Archive --- Total Messages Posted Sat 09/23/17: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 12:15 AM - O-200 Engine Misfire (Peter Johnson) 2. 04:43 AM - Re: O-200 Engine Misfire (Neal George) 3. 04:13 PM - Re: O-200 Engine Misfire (Peter Johnson) ________________________________ Message 1 _____________________________________ Time: 12:15:28 AM PST US Subject: Continental-List: O-200 Engine Misfire From: Peter Johnson Hi Guys, I have an O-200 engine in my Zodiac 601 XLB with around 200 hours on it. I experienced a misfire during a circuit the other day causing me to terminate the flight quickly. The problem felt like I was doing a very quick mag dead cut mid-flight. I landed and have been trying to find the problem ever since. I have had the mags checked. One mag had a suspect condenser so that, along with the contact breaker, was changed. I have checked the harnesses, p-leads and mag switch. I have also changed all the spark plugs and I still experience the problem. I have carried out a number of ground runs trying to find the problem. At high RPM, the engine stumbles very briefly with a discharge of black smoke through the left-hand (only the left hand) exhaust pipe. I took a video today and have uploaded it to YouTube. The link is https://youtu.be/j-FUdw6UVRk. If you keep an eye on the exhaust pipe you can see the black smoke. The stumble toward the end of the video is me leaning the mixture and getting too lean. Has anybody any ideas on the possible cause of this misfire? Many thanks Peter Wonthaggi Australia http://www.cpc-world.com .. ________________________________ Message 2 _____________________________________ Time: 04:43:17 AM PST US From: Neal George Subject: RE: Continental-List: O-200 Engine Misfire Peter - It seems to be running a little rich, also looks like the right side is puffing a little, too. Does leaning change the behavior? Which mags? Ignition control - Key switch or toggles? If key - twist to start, push to start, or separate start switch? P-lead condition, switch condition & configuration (grounded at the mag or switch end)? Brand of plugs? How old - calendar and tach? Which plugs - what number? Have you checked the plugs for wear, gap, lead or oil fouling, resistance <5k ohms? Arcing / corrosion in the plug socket and harness contacts / springs (both ends)? Induction leaks? Carb & induction manifold gaskets? Induction tube couplers - hard, dried out, cracks, checks, and fit the tubes? Induction tube cracks? (too many people crank the hose clamps down way too tight and crack the tubes) Does it also miss at cruise power? Neal George Product Support Engineer Continental Motors 2039 South Broad Street Mobile, Alabama 36615 Office: 888-826-5465 This electronic mail message contains information that (a) is or may be LEGALLY PRIVILEGED, CONFIDENTIAL, PROPRIETARY IN NATURE, OR OTHERWISE PROTECTED BY LAW FROM DISCLOSURE, and (b) is intended only for the use of the Addressee(s) named herein. If you are not the intended recipient, an addressee, or the person responsible for delivering this to an addressee, you are hereby notified that reading, using, copying, or distributing any part of this message is strictly prohibited. If you have received this electronic mail message in error, please contact us immediately and take the steps necessary to delete the message completely from your computer system. -----Original Message----- From: owner-continental-list-server@matronics.com [mailto:owner-continental-list-server@matronics.com] On Behalf Of Peter Johnson Sent: Saturday, September 23, 2017 1:59 AM Subject: Continental-List: O-200 Engine Misfire Hi Guys, I have an O-200 engine in my Zodiac 601 XLB with around 200 hours on it. I experienced a misfire during a circuit the other day causing me to terminate the flight quickly. The problem felt like I was doing a very quick mag dead cut mid-flight. I landed and have been trying to find the problem ever since. I have had the mags checked. One mag had a suspect condenser so that, along with the contact breaker, was changed. I have checked the harnesses, p-leads and mag switch. I have also changed all the spark plugs and I still experience the problem. I have carried out a number of ground runs trying to find the problem. At high RPM, the engine stumbles very briefly with a discharge of black smoke through the left-hand (only the left hand) exhaust pipe. I took a video today and have uploaded it to YouTube. The link is https://youtu.be/j-FUdw6UVRk. If you keep an eye on the exhaust pipe you can see the black smoke. The stumble toward the end of the video is me leaning the mixture and getting too lean. Has anybody any ideas on the possible cause of this misfire? Many thanks Peter Wonthaggi Australia https://linkprotect.cudasvc.com/url?a=http://www.cpc-world.com&c=E,1,Btp3kHOrSLxhPkUsS9sBPorzTSwB5DmYMU9aqdTMAGbKRVO0lx7LwvXH2drtIJ5EOyD4UYBILVbK3N6cLfKgFZe-PnEkw1Ct9zeDpJccfREZC2-TBZRXBT_SvA,,&typo=1 .. ________________________________ Message 3 _____________________________________ Time: 04:13:50 PM PST US Subject: Re: Continental-List: O-200 Engine Misfire From: Peter Johnson Neal, Thanks for the response. Answers are indented, hope that helps. Thanks Peter On 23/9/17, 9:41 pm, "Neal George" wrote: Peter - It seems to be running a little rich, also looks like the right side is puffing a little, too. Does leaning change the behaviour? When leaning for the video, the engine speed increased slightly but the puffs of black smoke continued. Which mags? Bendix S4-LN-21. Ignition control - Key switch or toggles? Key switch. If key - twist to start, push to start, or separate start switch? Twist to start (ACS model A-510-2). P-lead condition, switch condition & configuration (grounded at the mag or switch end)? P-leads appear to be OK, as does the switch. The p-leads were originally grounded at the mag but are now grounded at the switch end. Brand of plugs? I have two types of plugs. Champion REM40E on the bottom and Denso W24EMR-C On top. The automotive Denso plugs are there to provide clearance to the cowling and have 5K resistance caps. How old - calendar and tach? Densos are new, Champions are two years, 40 hours old. Which plugs - what number? See above. Have you checked the plugs for wear, gap, lead or oil fouling, resistance <5k ohms? Yes, I have also changed the whole plug set for different plugs with the same results. Arcing / corrosion in the plug socket and harness contacts / springs (both ends)? None that I can see. Induction leaks? Will need to remove and reinstall to check. Carb & induction manifold gaskets? The engine was reassembled around 20 hours ago after a crank gear change. New gaskets were used. Induction tube couplers - hard, dried out, cracks, checks, and fit the tubes? All look in good condition. Induction tube cracks? (too many people crank the hose clamps down way too tight and crack the tubes) All look in good condition. Does it also miss at cruise power? I dont think so, seems to happen at max rpm. I wasnt game to go for a local flight! Neal George Product Support Engineer Continental Motors 2039 South Broad Street Mobile, Alabama 36615 Office: 888-826-5465 -----Original Message----- From: owner-continental-list-server@matronics.com [mailto:owner-continental-list-server@matronics.com] On Behalf Of Peter Johnson Sent: Saturday, September 23, 2017 1:59 AM To: continental-list@matronics.com Subject: Continental-List: O-200 Engine Misfire Hi Guys, I have an O-200 engine in my Zodiac 601 XLB with around 200 hours on it.. I experienced a misfire during a circuit the other day causing me to terminate the flight quickly. The problem felt like I was doing a very quick mag dead cut mid-flight. I landed and have been trying to find the problem ever since. I have had the mags checked. One mag had a suspect condenser so that, along with the contact breaker, was changed. I have checked the harnesses, p-leads and mag switch. I have also changed all the spark plugs and I still experience the problem. I have carried out a number of ground runs trying to find the problem. At high RPM, the engine stumbles very briefly with a discharge of black smoke through the left-hand (only the left hand) exhaust pipe. I took a video today and have uploaded it to YouTube. The link is https://youtu.be/j-FUdw6UVRk. If you keep an eye on the exhaust pipe you can see the black smoke. The stumble toward the end of the video is me leaning the mixture and getting too lean. Has anybody any ideas on the possible cause of this misfire? Many thanks Peter Wonthaggi Australia . .. ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message continental-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Continental-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/continental-list Browse Digests http://www.matronics.com/digest/continental-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.