CNew 404 #1 Posted February 17, 2020 I’m sure this has been discussed before but starting a new thread to capture the knowledge. Is there a simple way to check coil function on the bench? I have an older style coil that is really beat up and I think has been exposed to some nasty chemicals or something because the plastic housing is gummy, soft and sticky. It also has a deep gash that broke through to the coil underneath. Not sure if it’ll function or is fixable. Share this post Link to post Share on other sites
JUST O&R 237 #2 Posted February 17, 2020 It doesn't look good . I had a coil tester years ago but when the stopped using points in the 80s sold it wish I had it now hindsight is 20/20 Share this post Link to post Share on other sites
CNew 404 #3 Posted February 17, 2020 Yeah, guessing this one isn’t going to be repairable. I’ll have to dig through my stuff to see if I have another donor coil like this older style. Share this post Link to post Share on other sites
factory 487 #4 Posted February 17, 2020 The only simple test is to use a multimeter (set to ohms/resistance function) to test the two coil windings, the secondary coil should have a resistance in the kilohm's range, but this will not tell you if the secondary has shorted turns. Coil testers can't be common outside of a repair shop, with a bit more electronic knowledge other test gear could be used. David Share this post Link to post Share on other sites
Wallfish 698 #5 Posted February 17, 2020 You probably don't want that coil on one of your collectables anyway. Replace it. Share this post Link to post Share on other sites
CNew 404 #6 Posted February 18, 2020 Yeah, looking to replace this one. The plastic is so squishy and sticky it’s nasty! Now I just need to keep on the lookout for one of these older style coils... Share this post Link to post Share on other sites
Wallfish 698 #7 Posted February 18, 2020 I have a good coil but the wires are messed up. A little wire, a little solder, a little shrink tube or just shrink tube them. Let me know if you want it Share this post Link to post Share on other sites
CNew 404 #8 Posted February 18, 2020 Thanks John, I might take you up on that. I found another one off an old rusted engine- it’s pretty ugly. I’m going to try it first but I don’t have high hopes because it’s pretty corroded and rusted between all the little thin metal plates. If it doesn’t work then I’ll probably need to buy your’s. I finally got this little engine all pulled apart and forgot about these early ones having the bearings with the plastic cages - what a bad engineering idea that was... This may not have been the best engine for me to pick as an experiment for gasket and seal alternatives but I’m committed now... Share this post Link to post Share on other sites
JUST O&R 237 #9 Posted February 18, 2020 8 hours ago, CNew said: This may not have been the best engine for me to pick as an experiment for gasket and seal alternatives but I’m committed now... Do you need some ( better) bearings ? I should had some somewhere. Share this post Link to post Share on other sites
CNew 404 #10 Posted February 18, 2020 16 minutes ago, JUST O&R said: Do you need some ( better) bearings ? I should had some somewhere. I might, it looks like at least one of the cages has a crack all the way through. It’s still holding together and the rollers move freely. I’m surprised this old plastic hasn’t disintegrated completely, however I suspect running the engine might blow it to bits... I’m going to scrounge through my stuff as well and see if I have something in a donor engine. I don’t really want to put new parts in this engine, I’d rather save them for a tool project. I’ll keep you posted but if you come across some let me know. These older style plastic ones seem to be a little harder to come by. I wish it were possible to swap over to metal but the design is completely different. I’ll try to add a couple photos of what I’m running into later tonight. Share this post Link to post Share on other sites
factory 487 #11 Posted February 18, 2020 Already off topic, oh well. They did use metal bearing cages in the late production model plane engines that preceded the Compact range, must have been a crap cost cutting idea to use the plastic ones, they also seem to swell up which may be the reason they destroy themselves. David Share this post Link to post Share on other sites
JUST O&R 237 #12 Posted February 18, 2020 2 minutes ago, factory said: Already off topic, oh well I've done it again Share this post Link to post Share on other sites
factory 487 #13 Posted February 18, 2020 I'll let you off, Clint mentioned the bearings first. David Share this post Link to post Share on other sites
JUST O&R 237 #14 Posted February 18, 2020 He’s the one that Leeds use astray I see a smile David that’s great Share this post Link to post Share on other sites
CNew 404 #15 Posted February 18, 2020 Ha, I caught myself which is why I started the separate Type 117 thread... Share this post Link to post Share on other sites
JUST O&R 237 #16 Posted February 18, 2020 I think its great we got David smiling ( but you got use all in trouble) thanks now I'm the one they all look at for the descriptions. Share this post Link to post Share on other sites
JUST O&R 237 #17 Posted February 18, 2020 40 minutes ago, CNew said: Ha, I caught myself which is why I started the separate Type 117 thread... This is way you got thrown under the bus Share this post Link to post Share on other sites
CNew 404 #18 Posted February 18, 2020 I’m working on it Share this post Link to post Share on other sites
JUST O&R 237 #19 Posted February 18, 2020 p.s. I don't think anyone looking so maybe we can figure this out. Share this post Link to post Share on other sites
