1967 40hp evinrude sheered key-way

[widdifd]

can some one help me with this problem,i have a 67 evinrude 40hp that the key way sheered off,i replaced they key way put all back together along with new points plugs wires coils,rebuilt carb new fuel pump,by the way it ran fine before all this happened,and now it seems like i have a timming issue.it only fires on one cyl. but wont start unless i move the plate the coils sit on all the way to the right and when i turn it back to the idle position it stalls and only fires on one plug and a no start.before all this the engine ran great and would fire right up. anybody got a clue what might be causeing this.??

 

[tashasdaddy]

Re: 1967 40hp evinrude sheered key-way

swap plug wires and try it.

 

[widdifd]

Re: 1967 40hp evinrude sheered key-way

i swaped the plugs and still the same result....thanks for the input.

 

[bktheking]

Re: 1967 40hp evinrude sheered key-way

Sounds like you have a plug wire issue, pull the mag plate off and check where they go into the coil, sounds like it is only making contact while the mag plate is at a certain position.

 

[F_R]

Re: 1967 40hp evinrude sheered key-way

With you having replaced virtually everything in there and it still running on one cylinder, you obviously did something wrong or got a defective part. We can guess all day what that something might be. The only way to know is to go back in and see.

BTW, why did it shear the key? Somebody in the past obviously did not install the flywheel correctly. The first time it shears, it causes damage. Every time it shears after that, it causes more damage. Sooner or later you have junk.

 

[Texasmark]

Re: 1967 40hp evinrude sheered key-way

The other thing I found (was a lawnmower but same timing/magneto system type) was that the flywheel and the crankshaft have to be in perfect alignment with no slack (flywheel nut tight) and no deformation (partial shearing) of a snug/tight fitting key. However, since the magnet in the flywheel makes 360 and passes 2 ignition coils and one is reacting adequately and the other is not, either your points are misaligned on that cylinder or as stated, you have other problems.

Again one wonders what sheared the pin. A good hard underwater strike at WOT could do it. Otherwise makes you wonder.

Mark

 

[steelespike]

Re: 1967 40hp evinrude sheered key-way

I would suspect you got the plug wires messed up or points set wrong or assembled wrong.When you installed the flywheel were the bore and crank taper clean and dry?Did you torque the nut to 100 to 105 ft lbs.?Did you line up the coils to the bosses on the stator plate?

 

[Willyclay]

Re: 1967 40hp evinrude sheered key-way

Another member, bashr52, recently posted that he had a bad set of new points right out of the box. I do not remember if they were OEM or aftermarket. It's usually something simple like the ground wire from the points or the overspeed switch wires frayed or connected wrong. Hang in there and you will find it with the help of the experts, which I am not.