Home › Forum › Ask A Member › Sound like bad bearing to you??
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Mumbles.
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April 9, 2016 at 8:39 pm #4000
Mid 60’s Johnson 18 hp. Starting around 13 seconds there is a "chirp" every revolution. This sound like a bad bearings? Nothing obviously rubbing under the flywheel. Click for video. http://vid635.photobucket.com/albums/uu … 0pnbyz.mp4
http://vid635.photobucket.com/albums/uu … 0pnbyz.mp4
April 9, 2016 at 9:00 pm #34586I had to watch it a few times to hear it, but eventually did. Sure does sound like it from the video, but hard to tell. Is there any forward/aft movement of the flywheel?
I am just buttoning up a rebuild of a ’61 18hp with the same problem. Both upper and lower bearings were shot! Found the recirc line completely plugged up, I would have finished today but realized I don’t have any little fuel barbs to install to replace with the original with new. My project also had a bad bottom carbon seal, and missing drive shaft o ring, letting water into the bottom bearing.
April 9, 2016 at 9:21 pm #34587I don’t know. If a bad bearing my normal experience is that the noise is continuous while running. Your seems to come and go. Maybe recirculation lines not providing correct amount of oil? Engine also seems to shake quite a bit, possible the shaking is causing something to scrape against something else?
April 9, 2016 at 9:22 pm #34588Hard to tell but sounds like crankshaft main bearings. I’ll be if you disassemble it you will find the center main bearing shot, along with scoring on the crank a possibility.
April 9, 2016 at 10:35 pm #34591Before folks have you tearing your engine completely apart check the flywheel to coil spacing. Hard to tell in the video but it almost looks like the mag plate is oscillating a bit.
April 9, 2016 at 10:58 pm #34595I dunno, I’ve heard lots of bad bearings over the years, but never one that sounded like that one. But I don’t know what else it might be, unless something under the flywheel as already suggested. Hey, you have to pull the flywheel before you can get to the rest of it anyway. Maybe you’ll luck out.
April 9, 2016 at 11:30 pm #34599Yeah, there is a fair bit of lateral movement on the crank. I did have the flywheel off to clean and set the points. I used Franks coil locating ring to confirm the coils are located properly. I even dimpled the collar where the mag plate rides to eliminate some of the slop from that worn bushing.That worked quite well for that issue, but of coursed did nothing for the sloppy crank. I had hopes for this motor, but not any more 🙁 I guess I have been lucky in the past as I haven’t had a powerhead with the mains worn like this.
April 10, 2016 at 12:37 am #34602If the crank slops back and forth, that pretty much settles it doesn’t it?
April 10, 2016 at 12:39 am #34603quote FrankR:If the crank slops back and forth, that pretty much settles it doesn’t it?
Yup. I know I should have checked that before posting the question. 😳April 10, 2016 at 12:00 pm #34626quote Wedgie:Yeah, there is a fair bit of lateral movement on the crank. I did have the flywheel off to clean and set the points. I used Franks coil locating ring to confirm the coils are located properly. I even dimpled the collar where the mag plate rides to eliminate some of the slop from that worn bushing.That worked quite well for that issue, but of coursed did nothing for the sloppy crank. I had hopes for this motor, but not any more 🙁 I guess I have been lucky in the past as I haven’t had a powerhead with the mains worn like this.just so i know how its done, do you guys check visually, or are dial indicators required?
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