Merc/OMC 140 Flywheel

[ryan_eyres]

Hey all,

I'm in the process of dropping a rebuilt GM 181 block into my boat with an OMC hydromechanical stringer outdrive and I've got to make a decision on one of 2 flywheels that came with the boat.

They are both the same dimensions but one is just slightly lighter than the other due to some machined out areas on the backside. They are both original and unmodified. I weighed them and one weighs about 31lb and the other weighs about 29.5lb.

How should I decide which to use? I was thinking that the heavier one might create a smoother idle for trolling.. what do you think?

Thanks,

-Ryan

 

[zbnutcase]

Re: Merc/OMC 140 Flywheel

If you plan on trolling, yes I would use the heavier one. 'nutcase

 

[cruisewave]

Re: Merc/OMC 140 Flywheel

I would use the un modified one due to whoever machined the modified one may not be right and could throw your timing off.

 

[Bondo]

Re: Merc/OMC 140 Flywheel

Ayuh,... Donno about timin',..
But I'd use the 1 that was mated to the crankshaft you're using,...
That's the 1 it's Balanced for...

 

[Don S]

Re: Merc/OMC 140 Flywheel

I would use the un modified one due to whoever machined the modified one may not be right and could throw your timing off.

How can it throw the timing off ???????

 

[ryan_eyres]

Re: Merc/OMC 140 Flywheel

Both flywheels are original and unmodified, just slightly different designs on the backside of the wheel. One has slightly more material machined off the back which makes it lighter.

Not sure which one goes with the new engine, but I think I'll just go with the heavier one at this point, unless someone has a good reason why I shouldn't.. I figure it should smooth out the idle a bit.

Thanks,

-Ryan