Evinrude E-NATION, for those dedicated to water, power, fishing and fun
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Mate
Posts: 4
Registered: ‎05-29-2019

Engine problem

Hey guys, I have a 1973 85HP Evinrude. The left side of the engine is not running. Cylinder 2 and 4. Anyone know what would cause this? I suspect either power pack or optical sensor but I don't want to be swapping parts. TIA
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Admiral
Posts: 8,843
Registered: ‎07-14-2011

Re: Engine problem

[ Edited ]

 

 

 

To avoid swapping parts  by utilizing the keep replacing stuff until it works syndrome it is best to obtain a servce manual and the tools needed to troubleshoot the ignition system correctly. Another option is to have a trained tech check it over for you.

Finding out why 2 cylinders are not firing on that 1973 MagFlash ignition system should not take long at all for an experienced tech. Most likely the pack, sensors, or wiring are at fault as 2 bad coils at the same time would be a rarity. There are no optical sensors on your motor.

If you find any cracked coils, replace them right away even if they work. Over time they can damage a power pack.

 

 

 


"There is never just one thing wrong with a boat";
                    -- Travis McGee, main character in a book series by John D. McDonald 


 



***************

The factory recommends that a properly trained technician service your Johnson or Evinrude outboard motor. Should you elect to perform repairs yourself, use caution, common sense, and observe safety procedures in the vicinity of flammable liquids, around moving parts, near high-temperature components, and working with electrical or ignition systems.

The information offered here is only general in nature and should not be construed as complete factory approved procedures, techniques, or specifications. Always use the proper service manual for your motor, up-to-date service literature, the correct tools, and have an understanding of how to proceed with troubleshooting and repair methods. If you are unsure or uncomfortable with a procedure, a situation, or a technique, enlist the services of a factory trained technician.


Highlighted
Mate
Posts: 4
Registered: ‎05-29-2019

Re: Engine problem

Thanks Bill. By Sensor, are you speaking of timer base and sensor?
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Mate
Posts: 4
Registered: ‎05-29-2019

Re: Engine problem

Btw, nobody in my area will work on anything older than 1990. I believe my father had a service manual for it. I will try to locate it.
Highlighted
Admiral
Posts: 8,843
Registered: ‎07-14-2011

Re: Engine problem


@Tigerfish157 wrote:
Thanks Bill. By Sensor, are you speaking of timer base and sensor?

yes

 

 

 


"There is never just one thing wrong with a boat";
                    -- Travis McGee, main character in a book series by John D. McDonald 


 



***************

The factory recommends that a properly trained technician service your Johnson or Evinrude outboard motor. Should you elect to perform repairs yourself, use caution, common sense, and observe safety procedures in the vicinity of flammable liquids, around moving parts, near high-temperature components, and working with electrical or ignition systems.

The information offered here is only general in nature and should not be construed as complete factory approved procedures, techniques, or specifications. Always use the proper service manual for your motor, up-to-date service literature, the correct tools, and have an understanding of how to proceed with troubleshooting and repair methods. If you are unsure or uncomfortable with a procedure, a situation, or a technique, enlist the services of a factory trained technician.


Highlighted
Mate
Posts: 4
Registered: ‎05-29-2019

Re: Engine problem

Okay. I found the shop manual. The ohm reading between 9 and 12 for the sensor coil is good. However the reading between 2 and 4 showed open. Looks like I will be replacing sensor coil and timer base. Also I'm showing cracked coils on cylinder 1 and 3 so I will be replacing those as well. The stator ohmed out good but I have not done a spark test.