Flywheel Only Turns 3/4

[jddmac21]

My 96 115hp Johnson made a loud clank and shut off and the flywheel was stuck. I was able to get the flywheel to turn after pulling the spark plugs with a socket but it would only turn 3/4 in each direction and then stop. When I pulled the spark plugs I noticed one of them was smashed shut. Do not believe the spark plug was damaged before install. Any ideas on what could cause this?

 

[boobie]

Re: Flywheel Only Turns 3/4

Due to the fact one of the spark plugs was smashed shut, pull the heads and take a good look at the cyl's, especially the one with the bad plug.

 

[tx1961whaler]

Re: Flywheel Only Turns 3/4

Due to the fact one of the spark plugs was smashed shut, pull the heads and take a good look at the cyl's, especially the one with the bad plug.

You mean the one with the broken connecting rod?

 

[boobie]

Re: Flywheel Only Turns 3/4

Or piston.

 

[REDDOG185]

Re: Flywheel Only Turns 3/4

Sounds very similar to what happened to me with my 89 Evinrude 120. That cylinder was cooked. Now I am trying to pull the flywheel to tear the engine down. I am reasonably confident that the connecting rod is broken, and at a minimum, I am going to have to bore the cylinder and replace the piston. I can't even get the darn flywheel off. If this first step is any indication of what is to come, man!

 

[boobie]

Re: Flywheel Only Turns 3/4

You may want to read the BLUE HIGH LITED section at the top of this forum.

 

[jddmac21]

Re: Flywheel Only Turns 3/4

Thanks for the info. I will look into the connecting rod and cylinders.