posted 07-11-2003 10:18 PM ET (US)
Otay-Here is the current state of affairs with the ignition problems I was having with my Evinrude 225, as reported in an earlier thread that got off into other issues, like cooling - I wanted to wait until I had some good news to report, and now think I have some.
I concluded with the kind help of some of the guys here that my rectifier was hurting. In the course of trying to track down some intermittent medium and high speed missing, my tach started to behave erratically, and after tweaking the pole adjustment on the back of the tach, it still wasn't right. Attached a volt meter to the disconnected gray wire on the back of the tach, and only read 5 volts when I understand it should read 12. So I ordered a new rectifier.
I pulled the flywheel so as to have access to the power pack and rectifier, and when I pulled the flywheel off, some stray pieces of sheet metal fell out. I pulled the stator and upon close inspection, they turned out to be from a piece of sheet metal that had been a part of one of the charge coils on the stator. It appeared that some pinkish looking stuff had boiled out from all three coils on the stator, and some of it had apparently gotten in behind this one piece of sheet metal and when it cooled and expanded (or got hot and expanded) it pushed this piece of sheet metal out far enough that it got caught up in the magnets on the inside of the flywheel and broke off. The conclusion was that the presence of the pinkish stuff indicated an overheated and damaged stator. Additionally, some literature I have stated that when you see the kind of condition my stator was in, it's a good bet the rectifier is shot, too. Well, I had already ordered the rectifier, so I ordered a stator too. I'm not able to say with any kind of scientific certainty that either one of those pieces was shot, but they were 12 years old, and I figured if either one or both weren't shot, the day would probably come before too long when they would be, and here I was with the flywheel off, so let's do it!
(Let me throw in a plug here for Mike Seiler and Seiler Marine - *extremely* knowledgeable and helpful with OMC parts, at very good prices and very timely and courteous service. Also helpful in procuring some CDI testing equipment. With my new Fluke 88 multimeter and the accessories I picked up for outboards, I don't need to take this machine back to a mechanid ever - and I couldn't afford to anyway, with all thisa testing equipment I just bought...)
Anyway, everything arrived and I put it together. First thing found that the new rectifier only had 4 wires when the old one had 5. My local OMC shop (I think they're getting tired of seeing me) told me the purple wire the new rectifier was missing would have provided 12 volts from the ignition to excite the rectifier, but this was the correct one, so OMC must have figured out how to excite the new rectifiers internally (Viagra?). So in it went. Next thing was that the old stator had a yellow wire and a yellow/gray wire coming from the two charge coils respectively, but the new one had two yellows and no yellow/gray. My new friends at the local OMC shop told me that's okay, that means they can go either way (I'm not going to insert a sexual innuendo here...)
So I wrapped everything up, found a place for every wire and every nut and bolt, and had none left over! Hooked up the earmuffs, pumped the bulb, turned the key, and no fire. I mean none. This is getting a bit long so I'll give the short story and not talk about how many times I pulled the flywheel, switched wires, checked amphenol connectors and all the other stuff that didn't work. Finally I loosened up the power pack and looked closely at the rectifier installation, and I couldn't believe my eyes *or* my stupidity, but I had managed to torque the new rectifier down to the block with a short piece of wire in between the two. So everything came off again, I removed the rectifier so I could make sure the gasket was going to be OK, and man, had I flattened that wire out. Plenty of good copper had squose out, and we had a real fine ground where we really didn't need or want one.
Short story: Put everything back together and she started like a tiger, and *seems* to be running real well, and the tach is working like it should. I am still mystified about the gray wire on the back of the tach though, because now it is reading *4* volts. I would love comments from anyone about that one, as I would think it now should be reading 12 volts. Tomorrow I'm going to drop Outre' into a local lake and do some higher speed shakedown testing. More to come after that.
kingfish