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Michael, Master Mechanic
Category: Boat
Satisfied Customers: 257
Experience:  Over 25 years experience working on everything from PWC's to Mega Yachts
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how do you remove the flywheel on a 150 hp mercury black max

Resolved Question:

how do you remove the flywheel on a 150 hp mercury black max motor.. Do you have to reset anything putting it back together. 1987 motor
Submitted: 8 years ago.
Category: Boat
Expert:  Michael replied 8 years ago.
Hi Paul,

It's pretty basic, you just need something of a good flywheel holder to lock the flywheel so you can remove the flywheel nut with a socket and breaker bar. A large strap wrench works good as does fitting two bolts into the threaded holes on top the flywheel so that you can fit a pry bar between them. You can also use an impact wrench to remove the nut but you want to torque it back on by hand to the required specification.

After you have removed the nut you will need to adapt a puller to the bolt pattern of the holes in the top of the flywheel or purchase a flywheel puller from a Mercury dealer that threads into the recess in the center of the flywheel. You will need to lock the flywheel again while you're tightening the puller down. Do not hit the center of the puller shaft to try and "pop" the flywheel loose as this could damage the crankshaft and bearings.

Once the flywheel pops off, you will notice that it can only go back on the same due to the key way on the crankshaft so don't worry about that. Nothing needs to be reset, you're good to go.

I hope this answers your question... you can reply back to this post if you need further assistance with your Black Max. Otherwise, please click the accept button to accept my answer.

Best Regards,


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