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Johnson 35 outboard troubleshooting
Posted on 6/28/17 at 9:30 pm
Posted on 6/28/17 at 9:30 pm
My dad had a 1976 Johnson 35 outboard motor that he hasn't used in a while sitting around. I cleaned it up, replaced plugs and fuel line and it fired right up. It ran like a champ for about 10 minutes then it died while I was at full throttle and wouldn't crank again.
I took the cover off and the motor was hot a hell. I flicked some water on the flywheel and it immediately sizzled away. I kept looking while I was driving to make sure the motor was spitting water, which it was. It wasn't a steady stream, most like a spray. It didn't concern me too much because in my experience some old outboards put off more of a spray than a steady stream.
Fast forward a few hours after motor sat, and it fired right up again.
I have a basic understanding of outboards but I'm by no means knowledgeable. Anyone have any suggestions on what I should be looking at as the culprit and how to troubleshoot?
Thanks in advance for any help/advice
I took the cover off and the motor was hot a hell. I flicked some water on the flywheel and it immediately sizzled away. I kept looking while I was driving to make sure the motor was spitting water, which it was. It wasn't a steady stream, most like a spray. It didn't concern me too much because in my experience some old outboards put off more of a spray than a steady stream.
Fast forward a few hours after motor sat, and it fired right up again.
I have a basic understanding of outboards but I'm by no means knowledgeable. Anyone have any suggestions on what I should be looking at as the culprit and how to troubleshoot?
Thanks in advance for any help/advice
4
Posted on 6/28/17 at 9:56 pm to Bigpoppat
Did you replace the impeller?
Posted on 6/28/17 at 10:01 pm to Beessnax
No but I read that they can go bad pretty easily.
Would you recommend replacing the entire water pump or just the impeller?
Would you recommend replacing the entire water pump or just the impeller?
Posted on 6/28/17 at 10:02 pm to Beessnax
Agree on impeller. Should be a steady stream even on older engine. Sounds like overheating for sure so I'd start there. If impeller is new, check the impeller intake area for blockages. I've had pea gravel slow mine down a few times.
Posted on 6/28/17 at 10:24 pm to TigerAxeOK
Thanks for the tips. I just went ahead and ordered a new water pump repair kit and I'll change the whole thing. I'll let you guys know if it works
This post was edited on 6/28/17 at 10:25 pm
Posted on 6/28/17 at 10:34 pm to Bigpoppat
Cool. It would probably be a good idea to go ahead and order a few shear pins. Some models have a pouch under the cowling where they can be stored.
Posted on 6/28/17 at 11:26 pm to Bigpoppat
My dad has a 76 9.9 and not sure if the 35 is the same but until 78 the smaller johnsons didn't have a true tell-tale for the water system. The hole at the back is just a blubber hole that exhaust and spray will still come out of even if there's not good flow from the water pump. If you're familiar with it you can tell but it's tricky.
I would definitely change the impeller, and flush out the water passage while you have the lower unit off.
I would definitely change the impeller, and flush out the water passage while you have the lower unit off.
Posted on 6/28/17 at 11:33 pm to TheDrunkenTigah
If you can find a brass rod the same size you can cut your own shear pins. Do not go out on the water without extras.
Posted on 6/29/17 at 7:09 am to Bigpoppat
Did you mix 2 stroke oil with your gas!!!
Posted on 6/29/17 at 7:14 am to Bigpoppat
Take a compression reading, I'm thinking you have damaged the top end by running it that hot. It should read the same between the two cylinders and should be 150 or more.
The proper way is to take both plugs out, roll it over with the starter and when you have the highest reading that is what your compression is.
The proper way is to take both plugs out, roll it over with the starter and when you have the highest reading that is what your compression is.
Posted on 6/29/17 at 8:10 am to Barneyrb
Compression test will be done, that's on my to do list.
And gas was mixed 50:1
And gas was mixed 50:1
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