Farmall fan
Recruit
Thread starter- Joined
- Aug 12, 2018
- Messages
- 2
My 1984 Johnson 35 (model J35ELCRR) has always been a good starter and runner for the 10 years I've had it until recently. Let me say I'm usually pretty good at working on many different types of engines in my days, but outboards are something I don't have a lot of experience with.
OK, here's the symptoms. Engine starts, runs great. Shut it off and come back 5 minutes (or 5 hours) later and it will not start. Or it will start, but only runs on one cylinder. Or any combination of the above. Sometimes will start and run, other times no. When it does start and running on one cylinder, every once in a while it will run correctly for a second or two then back to one cylinder.
So, initially I figured it was fuel related so I went through the fuel system. Fresh fuel (this engine has never seen ethanol blended gas). Hoses are good, check valves at bulb are good, o rings on fuel connectors are good. Rebuilt fuel pump and carburetor (yes welch plugs removed), no issues observed in either, but they both got new components. Cranking test shows good fuel flow through the system. Still same symptoms.
So I move on to ignition. Checked rectifier using instructions on this forum, checks good. This is about the time I discovered that when running on one cylinder there was no spark on the top cylinder. New plugs, coils, and plug wires. No change. Have examined wiring harnesses for broken or damaged wires, none found.
I usually don't take a shotgun approach to repair (replacing components willy-nilly) but admit I've fallen into that on this repair. Am looking for ideas on where to go next. Thanks in advance for any advice.
OK, here's the symptoms. Engine starts, runs great. Shut it off and come back 5 minutes (or 5 hours) later and it will not start. Or it will start, but only runs on one cylinder. Or any combination of the above. Sometimes will start and run, other times no. When it does start and running on one cylinder, every once in a while it will run correctly for a second or two then back to one cylinder.
So, initially I figured it was fuel related so I went through the fuel system. Fresh fuel (this engine has never seen ethanol blended gas). Hoses are good, check valves at bulb are good, o rings on fuel connectors are good. Rebuilt fuel pump and carburetor (yes welch plugs removed), no issues observed in either, but they both got new components. Cranking test shows good fuel flow through the system. Still same symptoms.
So I move on to ignition. Checked rectifier using instructions on this forum, checks good. This is about the time I discovered that when running on one cylinder there was no spark on the top cylinder. New plugs, coils, and plug wires. No change. Have examined wiring harnesses for broken or damaged wires, none found.
I usually don't take a shotgun approach to repair (replacing components willy-nilly) but admit I've fallen into that on this repair. Am looking for ideas on where to go next. Thanks in advance for any advice.
