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Old 29 October 2004, 12:25   #1
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Merc flywheel removal

Ahoy,
Does anybody have a idea on how to remove the flywheel on a Merc 90 hp with out the factory tool that screws into the flywheel--
I don't want to get the big hammers out.
thanks
hank
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Old 29 October 2004, 12:38   #2
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Hank, even the outboard dealers have problems with these. Does the fly wheel have a couple of holes with threads in it that an ordinary puller will fit ? if so might be worth having a chat with a local garage. I am assuming you are nowhere near a merc dealer but if you are take it down to them.

Pete
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Old 29 October 2004, 21:25   #3
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No dealer around here -- there are some disadvantages living out in the sticks
closest one is 450km away. I guess a close as the phone.
I got the factory repair manual and it shows a special tool to remove the flywheel.
I better order the tool
thanks
hank
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Old 30 October 2004, 16:19   #4
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Mine came off quite easy (20hp merc) the puller has practicly very little effect except brute force if you shove a piece of wood under the side, and get a crowbar and lever it, it *should* pop off... the main thing holding it in position are the magnets on the side, once this force is broken, it becomes easy to remove. Im having a hard time remembering how exactly it came off... another thing to try is a tough piece of wood, wedge it in, and slam it with a hammer (Like this you dont stand a risk of bending anything)

Only follow my advice if your confident about it.. im just having a mindblank here at the moment.... when i started writing this i knew it, but now i dont!
Think it was something with wood + Leverage

Good luck!
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Old 30 October 2004, 16:30   #5
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Ideally you do need a flywheel puller, If you start with the hammers you can break the magnets of the inside off the flywheel as there only bonded on. The Puller for a 90 screws into the threads in the center of the flywheel, it has a thing just like a bolt that runs through the center which pushed against the crankshaft. What you must also do is make sure you have got the cap that goes between the "bolt" and the crank otherwise you can crack the top of the crank!. I only know this because i split a crank while removing a flywheel a few years ago
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Old 31 October 2004, 12:21   #6
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The reason I'm trying to get the flywheel off is someone tried using a bigger hammer and cracked one of the magnets-- we found magnetic parts
hanging down under the F/wheel.
I've made a few calls and will get a loaner tool this week
Next to find the correct replacement flywheel
thanks
hank
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Old 31 October 2004, 12:29   #7
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You'll be happy to know that i got quoted 500++ for a new flywheel for my machine, as it would probably have to be remade.. (1978 machine)

I hope you can find a (Cheap) source of spares!!!

Good luck.
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