1996 140 Tohatsu - Bad Cylinder - To Rebuild or Not To Rebuild ?

[jetboy12]

Long story short one cylinder is shot on my 96 140 Tohatsu (bad carb job - lean setting). I loved this motor up until now but I need some opinions on if its worth rebuilding (pretty low hours on motor before this happened). Full rebuild vs just the one bad cylinder ? Can I tear apart and have a shop redo to save some labor ? Do the whole thing myself ? Start over ? Thanks in advance !

 

[dtj]

Re: 1996 140 Tohatsu - Bad Cylinder - To Rebuild or Not To Rebuild ?

Long story short one cylinder is shot on my 96 140 Tohatsu (bad carb job - lean setting). I loved this motor up until now but I need some opinions on if its worth rebuilding (pretty low hours on motor before this happened). Full rebuild vs just the one bad cylinder ? Can I tear apart and have a shop redo to save some labor ? Do the whole thing myself ? Start over ? Thanks in advance !

Whats' wrong with the bad cylinder?..........Don

 

[jetboy12]

Re: 1996 140 Tohatsu - Bad Cylinder - To Rebuild or Not To Rebuild ?

I haven't pulled it yet but it looks like a burnt piston/bad cylinder. Alarm never went off and I shut it down quick so it didn't get too hot.

 

[pvanv]

Re: 1996 140 Tohatsu - Bad Cylinder - To Rebuild or Not To Rebuild ?

Check compression, pull the head and inspect. If the cylinder wall isn't too bad, you can hone it by hand, install new rings (and possibly a piston) and be running again.

 

[jetboy12]

Re: 1996 140 Tohatsu - Bad Cylinder - To Rebuild or Not To Rebuild ?

Thanks ! Any tricks on pulling the head off ? The lower bolts are rusty. Also just the bad cylinder replaced or a complete rebuild ?

 

[pvanv]

Re: 1996 140 Tohatsu - Bad Cylinder - To Rebuild or Not To Rebuild ?

Depends on what you find after you pull the head. On a motor of that vintage, a head bold might snap. In that case, you may end up with a helicoil insert for the offending bolt(s).