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Old 27-08-2013, 11:16 PM   #1
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Changing Flywheel on 250xs

Hi Guys/Girls I have never swapped or removed a flywheel before. I have a lightened and balanced flywheel for my 3l merc coming this week.

I take it all I have to do is undo the large nut holding it on, tap it off and swap them over?

Do I need to thread lock the new one on or do anything else at all?

Thanks Dave
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Old 27-08-2013, 11:23 PM   #2
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You'll need a puller. The right tool for the job will make it easy, the wrong will be a right nightmare.
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Old 27-08-2013, 11:27 PM   #3
oxo
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flywheel

Hi,
from painful experience it's not usually that simple, you may need a flywheel puller, they do them on ebay with a lifting eye as well for about £30.
Mine's been bloody invaluable! and you may need to apply a bit of heat i.e a heat gun or a blow torch to the flywheel. If somebody greased the crank splines you may have an easier time tho.
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Old 27-08-2013, 11:30 PM   #4
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Never needed heat (so far) and I use a puller also from ebay, which like you oxo has been great with the lifting eye as well.
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Old 27-08-2013, 11:44 PM   #5
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Quote:
Originally Posted by beyondhelp View Post
Never needed heat (so far) and I use a puller also from ebay, which like you oxo has been great with the lifting eye as well.
Cheers for advice guys, don't suppose you fancy giving us the item number for the correct puller........there's so many lol
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Old 28-08-2013, 12:10 AM   #6
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Cheers for advice guys, don't suppose you fancy giving us the item number for the correct puller........there's so many lol
As an act of brilliance I typed "mercury" in with fly wheel puller lol

The only one in the UK says upto 220hp only though.........I have messages the seller, see what he has to say.

Do I threadlock the new one back on?
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Old 28-08-2013, 12:10 AM   #7
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http://www.ebay.co.uk/itm/321185142570 I think this may do the job. Someone else may be able to confirm.
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Old 28-08-2013, 12:11 AM   #8
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I don't know how different the 3.0 are to the 2.4/2.5 but assuming its the same/similar no thread lock should be needed.

If your going to get hands dirty, perhaps look at getting a service manual?
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Old 28-08-2013, 12:19 AM   #9
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Hi that's the same one I looked at, says only to 220hp though. I have messaged the seller to see why. Cheers though
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Old 28-08-2013, 12:33 AM   #10
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Quote:
Originally Posted by beyondhelp View Post
I don't know how different the 3.0 are to the 2.4/2.5 but assuming its the same/similar no thread lock should be needed.

If your going to get hands dirty, perhaps look at getting a service manual?
Just bought the puller. Looks easy on the video lol
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Old 29-08-2013, 01:22 PM   #11
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You got a flywheel holder and a Torque Wrench with fairly high setting ?
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Old 29-08-2013, 02:12 PM   #12
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No I don't have a flywheel holder, never heard of one if I'm honest. Have several large torque wrenches. Not sure what setting they should be on for that though?

Any ideas anyone???
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Old 29-08-2013, 04:00 PM   #13
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i always use a 2p piece jammed between flywheel and starter cog as flywheel holder. i know its not the right way but it works
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Old 29-08-2013, 04:28 PM   #14
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one of these..

http://www.offshoremarineparts.com/52344/prod_7088.html
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Old 29-08-2013, 05:31 PM   #15
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Mine came from snapon many many moons ago but still available.

http://buy1.snapon.com/catalog/item....re=uk&tool=all

More expensive than 2p but cheaper than a new starter or even the dog on an earlier V6.
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Old 29-08-2013, 06:21 PM   #16
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Dave! You want offshore kids, flywheel and power. Just buy a bigger motor. It will be easier lol
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Old 29-08-2013, 11:09 PM   #17
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Ok how do I pu this flywheel back on correctly please.......with the 2p's please???

Thanks Dave

Paul you could be right haha or another engine!!!! Sure I could squeeze another one in there :-)
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Old 29-08-2013, 11:56 PM   #18
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Take note of the notes.
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Old 30-08-2013, 12:58 AM   #19
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Brilliant thank you very much. Now I understand what the flywheel holder is for. I'm going to ask something silly now, but what if I just leave it in gear? Thanks Dave

The protector cap, where can I buy one ASAP from please? Thanks again
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Old 30-08-2013, 01:02 AM   #20
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Dare I ask how the 2ps work please??? Thanks Dave
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