grade to avoid carbon deposits on the slip Translations provided by the Google Translate service. unfortunately the repair did not work as the Coil did not work so it had to be sent to rewinding. On many Rolls Royce models there is a dual ignition system. If not free to move, ease it. Great photos, quality! Twirl the armature. The air gap allows the voltage to build on the rotor until it is high enough to jump the gap thus it actually magnifies it somewhat. anglais, votre convenance. For example: Check as best you can that the brush is actually making contact with the track on which it runs. If you have an auto-ranging meter, the reading might jump about a bit on the way while it changes scales. The gap will widen as the wire ends melt further apart and soon the adjacent turns will be affected so the coil will eventually fail. However, dont make them lop-sided. A second coil, with many more turns than the primary, is wound on the same iron core to form an electrical transformer. Do not skimp on quality with pick-up brushes. If the coil has been in service since the magneto was new there is a good chance the insulation has started to break down, allowing voltage to track. It may not display this or other websites correctly. Espaol This will not stop the coil from working. old condenser to be disconnected. If nobody is available, then you can make a test plug by removing the earth electrode from an old, but functional, sparking plug. It should fit properly in only one precise position. We provide She was factory fitted with a Morris Vedette MKII engine which has a lucas rf4 magneto. 0000001184 00000 n Dansk Downloadable drawings, all for free, for In more modern times, insulation materials have improved to the point where constructing self-contained magnetos is relatively easy, but energy transfer systems are still used where the ultimate in reliability is required such as in aviation engines. found in all rotating-coil magnetos. It uses a magneto and a transformer to make pulses of high voltage for the spark plugs. However, for magnetos without a safety gap, if the armature is spun with nothing, or with a large gap, connected to the pick-up, it may cause a breakdown of the insulation around the HT winding or of the slip ring. many ignition systems, focusing especially on If it has any unusual marks, try to work out what caused them and whether anything should/could be done about them. At least I assume so: My timing light (seen in photo clamped to plug wire #1) illuminates correctly when plug #1 is unscrewed from the engine and sparks, but it does not light up when the plug is screwed into the engine. Check that the advance/retard mechanism reliably rotates the cam back and forth. Remove two nuts and funny-looking-long-thing that attaches the mag to the engine Check the plug-wires at the end that goes into the mag .and remove sparkplug-cap and make sure you have a good connection (maybe you'll want to cut of a bit and re-atttach) Remove the two high-tension pick-ups from the mag commonly found on classic motorcycles. 2,330 views Oct 18, 2020 16 Dislike Share Air Fuel Mixologist 1.31K subscribers I purchased this Lister D petrol (gasoline). 0000005012 00000 n Check the state of the tappet and replace if necessary. DIY Magneto Maintenance and Troubleshooting Ignition - Check Spark strength, Spark timing and . If it is significantly lower, then there is probably a short-circuit in the contact-breaker assembly or in the armature. That then produces a gap of about 4 mm between the centre electrode and the screw-threaded bit of the plug body. Always good to learn how to check lucas parts, one of the weaker parts of a triumph motor.. Classic Cycles inc. 2199 N. Batavia Suite J. NEWS FLASH - March 2020 As you will understand, with the Covid-19 pandemic shutting down most normal business, we are not able to despatch orders for the time being. Replace the cam, ensuring that the notches in it engage as before (e.g. I can never stress this enough to people who try to test out their mags. This expediential degradation may appear to be sudden when the fault occurs. of which is the product of Brightspark Magnetos Ltd's Thanks again. First test is to take the plug caps off the HT leads and position the ends of the HT leads 1/4" away from the casting. instruments available for immediate use, and a Links to some interesting Under construction, so far showing video The result in high resistance will reduce the current flow in the primary winding and reduce the magnetic flux which adversely effects the secondary winding output voltage. The points gaps with the heel at the centre of each lobe of the cam should be the same, but a small difference is inconsequential. All rewound units now have modern condensers and enameled wire. If the brass is black, it indicates that the brush(es) are too soft and/or years of neglect. Capacitors are replaced with ones that have a longer life expectancy and greater reliability. Trademark Office. Our %%EOF If you have identified the magneto as the source of your ignition fault send it to us for repair. Check that all the insulators are in good shape, and reassemble the contact breaker assembly. Values vary considerably depending on the make and model of magneto and who wound it. Grease. From the basic to the complex - some I'll try the 3/16" gap test. The magneto is rebuilt by a reputable US shop. However, typical signs of magneto problems are, among others: -- Bike hard to start. Brightspark Magnetos is now able to offer a remagnetising service, using our specially-developed remagnetising and measuring equipment to help you restore your magneto to tip-top condition. Some have both types of earth brush. I would narrow the plug gaps to .020" and see what happens. If the resistance is higher than about 15,000 ohms, it indicates a bad connection. rebuilding magnetos and of how to extract an Others have an earth brush between the main body of the magneto and an earth track of the armature. You can check for this by trying to start in a dark area with no lighting. Repeat with clean pieces of petrol-moistened rag, until the rag comes out clean. Magnetic - Check magnetism and Remagnetise magneto body. JVC 4VR-5436X 4 Channel Stereo Receiver Service Manual Original. that more owners can not only maintain their magnetos, Translate service. Place a clean piece of strong paper between the points, and with the points closed pull the paper out. It's a 6v system, so the starter turns rather slowly (maybe 80rpm), but I think it should be fast enoughto start. Comment Guidelines: Do post respectful and insightful comments. Lucas vertical magneto in good condition and sparking. So, re-check everything in the contact-breaker assembly first before deciding on a more complete overhaul. Svensk [7] Ignition magnetos were soon was used on most cars, for both low voltage systems (which used secondary coils to fire the spark plugs) and high voltage magnetos (which fired the spark plug directly, similar to induction coil ignition). Photo-sequences of stripping and The capacitor and the coil together form a resonant circuit which allows the energy to oscillate from the capacitor to the coil and back again. Open the points and blow between them to dislodge any remnants of paper. A small number of electrons is ever present and over years or decades this flow carves out an ever widening pathway through the insulation. detailed instructions in our 'condensectomy' To all you guys with Lucas magnetos with problems, get ready to see it fully functional for about $23 shipped, along with a little work in your garage. Italiana You must log in or register to reply here. The place to buy our EasyCap condensers VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. i'm an asshole, you probably shouldn't listen to me. As the points begin to open, point spacing is initially such that the voltage across the primary coil would arc across the points. If the pick-up is retained by spring clip, swing it to one side while holding the pick-up in place. Problems rooted in the magneto are sometimes obvious, or can seem like all sorts of other things. - there's a lot of stuff in our frequently A simple magneto (an electrical generator using permanent magnets) is able to produce relatively low voltage electricity, however it is unable to produce the high voltages required by a spark plug as used in most modern engines (aside from diesel engines). Then measure the resistance between the two points of the contact-breaker. old-style capacitor (the 'condensectomy') and Another problem, due to constant hot, cold, expansion, contraction, vibration or mechanical impact, is breakage of the fine winding wire. However, if the reading is more than 7000 ohms, there is probably either a break in the HT winding, or a bad connection between the live end of the HT winding and the slip-ring. If your magneto does not have an EasyCap but it fitted with a condenser buried in the armature, then it is impossible to check the condition of the condenser, while the armature is assembled, without specialised equipment. It uses a magneto and a transformer to make pulses of high voltage for the spark plugs.The older term "high-tension" means "high-voltage".Used on many cars in the early 20th century, ignition magnetos were largely replaced by induction coil . Remove the cam, carefully noting which way round it goes and which notches in it engage where. 0000003777 00000 n From time to time we have complete Measure the resistance between the magneto body and terminal in one and then the other of the the plug caps. I worked on farm equipment for my last real service job from 2013 thru 2016. Make sure they are there and can move in their holders and give them a good clean. Do similar tests with the HT lead(s) and the plug-cap(s). Check the condition of the HT lead(s) and plug-cap(s) and replace where necessary. with a fixed register in the cam housing and with the advance/retard actuator). We are unfortunately not able to offer Therefore, taking the sparking plug(s) out of the engine, laying them on the cylinder head and checking whether the magneto will produce a spark at kickstart speeds is not a sufficient test. Nederlandse 0000002602 00000 n V-TWINS Magnetos are always a compromise, usually producing a strong spark to one cylinder and a weaker one to the other. You can check the latter by removing the pick-up(s), rotating the armature in the proper direction until the points are just opening, and checking that the brass is visible directly underneath the pick-up hole (or one of the pick-up holes) in the magneto body.