The plugs are non resistor, gaped at -025", and are new. Come join the discussion about performance, restorations, modifications, classifieds, troubleshooting, maintenance, and more! Housings can sometimes get misshapen, in which case try to rectify that. Great photos, quality! Still here since 1996 serving BritBike enthusiasts. Hi group, It is summer in Denmark, nice but my Lucas KF2 Magneto do not like high temperatures. DIY Magneto Maintenance and Troubleshooting a separate spring-loaded holder (Lucas) or hidden at the back of the contact breaker plate (BT-H). 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. downloadable drawings for those of you who If it does not jump 3/16" it probably will not fire a cylinder under compression. The Magneto Guys - Vintage, Veteran, Classic Magneto Repairs Lucas Magnetos We have overhauled and repaired these Lucas magnetos and then returned them to their owners. As the size of the combustion chamber determines the time to burn the fuel charge, dual ignition was especially important for the large-bore aircraft engines around World War II where it was necessary to combust the entire fuel mixture in a shorter time than a single plug could provide, in order to build peak cylinder pressure at the rpm desired. It uses a magneto and a transformer to make pulses of high voltage for the spark plugs. Could be bad parts if spark just gets a lot weaker but if spark totally goes away when cap and rotor are installed, be sure the when you install them it does not short out the primary, give the rotor a closer ground to jump to or hold the points open, etc. rebuilding magnetos and of how to extract an While holding it in that position, tighten the centre screw, but do not use undue force. trailer Upgrade your membership to classic vehicles generally. Thanks mmcdonald, all good info. The magneto gives a good spark when spun by hand or when kicked over with the plugs removed. If there are any, replace the pick-up. Reassemble and check operation. However, typical signs of magneto problems are, among others: -- Bike hard to start. With BTH devices, if the moving point assembly fouls the eccentric pin, the pin will need to be adjusted. 0000003777 00000 n any service or repair work until further notice. BTW, Michael, that's a darn clever trick/solution! With a multimeter, check the resistance between the tip of the pick-up brush and the terminal in the plug cap. 0000009971 00000 n Magnetic - Check magnetism and Remagnetise magneto body. These are prone to deterioration and the cause of many ignition faults. Without suppressor: suppressor: Percentage difference with suppressor: Peak HT voltage to initiate spark: 9600 V: 10600 V at magneto: 10.4 %: 9300 V at spark gap-3.1 %: DC component of HT current immediately after striking spark: 53 mA: 52 mA-1.8 % With larger gaps, if the magneto is provided with a safety gap, the spark is more likely to jump there where it cant be seen, so thats a waste of time. 82 0 obj<> endobj 0000007301 00000 n 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. 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. Once Not sure what came off, but 1930s/40s I would have thought.prefer collection, but would post. All errors in the translations. %%EOF Put a smear of grease on the lobe(s) of the cam. commonly found on classic motorcycles. - there's a lot of stuff in our frequently how they work; and to collate as much other 0000003086 00000 n We also provide With the earth brush(es) now replaced, measure the resistance between the back-plate of the contact breaker assembly and the main body of the magneto. If they look good I would replace the condenser if it has one and retest. With other models, it may be inaccessible while the magneto is in situ, for example underneath. LUCAS K1F MAGNETO RUNNING AT 1200 RPM AT THE ARMATURE. If there is a difference, adjust the points so that it is the smaller gap that is 0.012 (0.3 mm). If you havent already done so, undo the contact-breaker centre-screw and remove the contact-breaker assembly. Then check that the contact-breaker assembly is not wobbly on the end of the shaft. Nous 0000002409 00000 n Measure the resistance between the magneto body and terminal in one and then the other of the the plug caps. With your multimeter set to display resistance and connected to the opposite faces of the circuit board of the EasyCap (and with your fingers touching no more than one side of the circuit), the meter reading should climb up from a low value until it goes off the scale (OL). Initially this was done because it was easier to provide good insulation for the secondary winding of an external coil than it was in a coil buried in the construction of the magneto (early magnetos had the coil assembly externally to the rotating parts to make them easier to insulateat the expense of efficiency). I pulled my B34 out after the winter and could not get it started. and other magneto parts. Over time the HT leads can degrade and reduce the potential difference at the spark plug. Brightspark Magnetos Ltd disclaims responsibility for any This was examined earlier. Fantastic! Any high tension magneto will have way more than 7 ohms resistance on the secondary circuit. The voltage generated in the primary winding is a product of its velocity through the magnetic field and the strength of that field, so the condition of the magnet is vital for the correct performance of the magneto. Likes: 260. scotland. If there are any, repeat until the paper comes out clean. JavaScript is disabled. It is almost a given that a Lucas armature will require replacement if in the original condition. [3] The capacitor's function is similar to that of a snubber as found in a flyback converter. Check the condition of the HT lead(s) and plug-cap(s) and replace where necessary. A short circuit absorbs all the power, hence no output or spark. 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. The Fora platform includes forum software by XenForo. "A Community of Antique Engine Enthusiasts." Downloadable drawings, all for free, for and overhauls. The last of these possible reasons is very often the cause. ZK~!c. 0 in the translations. tour of some of our specialised workshop In the case of a main-body earth brush, try moistening a cotton bud with petrol, and poke it through the hole for the earth brush to clean the track while rotating the armature, but IMPORTANTLY before doing that temporarily remove or disable the contact breaker to reduce the risk of electric shock and fire. It should fit properly in only one precise position. The points surfaces should be very slightly convex, so dont worry about getting them perfectly flat. "Colonel fair is fair: if I nail Hotlips and punch Hawkeye can I go home too?". If you are using an auto-advance timing gear, stuff a length of fuel line in the mech to hold it at full . After you get your spark strong enough, then worry about cap and rotor. If necessary, dress the points on a fine stone. read more deeply). Dansk Put a smear of grease on the surface of the cam that engages its housing. Now that the slip ring has dried off, replace the pick-up(s). Now let the slip ring dry out with the pick-ups still removed. part-exchange. Can you rig up real cables? If your bike runs poorly, backfires at all but idle, stalls out and won't start back when hot, then works again when cool. 0000006372 00000 n . detailed instructions in our 'condensectomy' Translate service. Lucas Magneto Bearing Shim Pack 15mm | E15 | N3048 | K1F | SR | K2F . With twin- or multi-cylinder magnetos, and some single-cylinder magnetos, the brass is a segment, rather than a complete ring, and you may need to rotate the armature in order to be able to see it. After 20 miles the ignition is down to zero. The wires are copper core with non resistor caps. Even if the points surfaces look good, clean them with fine emery cloth to remove any oxide layer. Because the magneto has low voltage output at low speed, starting an engine is more difficult. I think it may be do to condensor failure. JavaScript is disabled. With the Lucas KN1, it is under the identification tag. Then measure the resistance between the two points of the contact-breaker. With the engine running, place your hand over the pick-up with the same hand also touching the magneto body. performance. here. In the late 1890s, English engineer Frederick Richard Simms and German engineer Robert Bosch developed the first practical high-tension magneto. IMPORTANT. A small number of electrons is ever present and over years or decades this flow carves out an ever widening pathway through the insulation. I do not think this is your issue because the timing light does not trigger. The coils are, of course, designed for this pressure but no insulation is perfect. To help magneto owners look after their magnetos The older term "high-tension" means "high-voltage".[1]. We always replace the capacitor during a repair as experience has show us that the capacitor tends to be the most unreliable part. If you can see the slip-ring through the pick-up hole in the main housing, check that the brass ring or segment of the slip-ring is brass coloured (albeit possibly a bit dirty or tarnished), but not completely black. Re-install the contact-breaker assembly, ensuring that it registers properly with the armature shaft. Translations provided by the Google Just to reinforce a point here of something very well done that you did in the how-to: when you're testing a mag like this, ALWAYS have the plug wires hooked up with a gap (or plugs) to ground so that energy has somewhere to go. "Specializing in Triumph and other fine Vintage motorcycles". If you are sure that all earth brushes are removed, and if either the magneto has a fibre drive pinion or the drive pinion/sprocket has been removed, you can now check the effectiveness of the bearing insulators. If there is a quickly-detachable connection between the HT lead and pick-up, undo it and check the condition of the connection. With a multimeter, check the resistance between the brass of the slip ring and the end of the armature shaft (armature earth). 0000001569 00000 n to suit the needs of a customer. If you do, then replace the pick-up. Regrettably, some Acrobat .pdf files might not Under construction, so far showing video If you do not obtain readings substantially the same as the reading you obtained in the internal HT continuity section, and if everything else you previously checked is still good, it indicates that the pick-up brush(es) is/are not making good electrical contact with the brass of the slip ring. From time to time we have complete detailed guide to maintaining and And a f-ing video! Posts: 34. If it is significantly lower, then there is probably a short-circuit in the contact-breaker assembly or in the armature. 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 . long practical experience of working on magnetos and Comment Guidelines: Do post respectful and insightful comments. Nederlandse Check for any dirty marks on the paper. You can check for this by trying to start in a dark area with no lighting. Copyright 2023, Antique Automobile Club of America. For example, in the Lucas K1F and K2F, the earth brush is located on top inboard of the main mounting flange. These faults do not necessarily occur instantaneously, they may develop over time leading to a gradual deterioration of the spark output. demand to 'perfectly functional' or 'as-new' This induces an EMF in the coil, which in turn causes a current to flow. A good Wico X series mag will jump at least 3/8" air gap. Stored in the dry. A lot of carbon dust on the inside of the pick-up indicates that the brush is too soft, in which case it should be replaced with a brush of the correct grade. Please get in contact if you know anything about aerograph compressors especially if you have technical drawings.Last, but not least, if you want to receive notifications when more videos in this series are uploaded please subscribe to the channel. He got it and thought the ring the points rides in came out and just needed pushed in. If not free to move, ease it. rebuilt amature runs about 85pnds from independent ignition. Magneto coils are usually a long time dying. Rotate the armature and check that the contact- breaker spring never touches the cam. Initial installation does require the If working on your own, holding the end of the HT cable steady 6 mm from the engine is difficult when kicking the starter. On many Rolls Royce models there is a dual ignition system. Lucas Ga4 Magneto Austin 7, Morris, Riley And Many Others Service Exchan. When screwed in the head, however, the plugs make no spark. Check the cam surface. I would definitely try another condenser if it were me. On the very first BSA I ever owned, I sufferred the same problem. [5] The hub of the magneto rotates while the drive shaft is held stationary, and the spring tension builds up. Undo the contact-breaker centre-screw and remove the contact-breaker assembly. dynamos, regulators, alternators and We shall resume operations as soon as we possibly can. Gift Article. (Chinese) magnetos. This will not stop the coil from working. This disables the magneto to reduce the risk of electric shock and fire. 0000002847 00000 n With the plugs in the engine connect one plug outside like you have been testing it to confirm no spark, If there is spark present I would open the gap of an old spark plug to 3/16" and see if the spark will jump that gap. This disables the magneto to reduce the risk of electric shock and fire. quality are also available, of the correct 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. unfortunately the repair did not work as the Coil did not work so it had to be sent to rewinding. I got it back, spun it, sparked. Fit the magneto gear to the magneto shaft and finger tighten the nut ONLY until the gear is snug on the tapered shaft. To have the discharge go arc back into the coil itself or the mag housing causes some serious damage. Capacitors, which are short-term storage devices, often fail in older magnetos due to dielectric degradation (short circuit) or conductor breakage (open circuit). If there is a lubricating felt, soak it in oil. Links to some interesting [7] Ignition magnetos were largely replaced by ignition coils once batteries became common in cars, since a battery-operated coil can provide a high-voltage spark even at low speeds, making starting easier.[8]. [6], The first car to use magneto ignition was the 1901 German Mercedes 35 hp racing car, followed by various cars produced by Benz, Mors, Turcat-Mery, and Nesseldorf. The place to buy our EasyCap condensers Thank you for your patience. Check the state of the contact return spring and replace if broken. I purchased this Lister D petrol (gasoline) engine that came on a trolley with an Aerograph air compressor. 0000013093 00000 n If you have a Megger or similar insulation tester, set it to test at 500V. If you have an auto-ranging meter, the reading might jump about a bit on the way while it changes scales. Measure the resistance between the magneto body and terminal in the plug cap. The permanent magnet can be static, as in the classical horse-shoe form, with the transformer windings rotating between the poles, or sometimes the magnet is mounted on the armature and rotates within the core of a static winding. I can never stress this enough to people who try to test out their mags. A That then produces a gap of about 4 mm between the centre electrode and the screw-threaded bit of the plug body.
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