1997 Mercury 225 EFI Promax Upper bearing Replacement Help Needed

[slayer021175666]

Hi.
I have a top bearing going out and I have some questions.
1- Can I just loosen the top case bolts to get the bearing out?
2- Can I replace the just the bearing or do I need to replace the whole assembly?
3- Some say a bad bearing will ruin the crank itself. What should I look for to know if its ok?
Thanks Guys

 

[Faztbullet]

1) Yes you can loosen and pull it out...no prying
2) Depends if bearing spun in housing and damaged it
3) Crank surface should has a polished smooth finish...any imperfections or markings crank needs repaired.

 

[slayer021175666]

Thank You, Faztbullet.
So if the bearing spins in the housing assy, I need to replace the bearing and the housing? And, if the bearing is still tight in the housing (I take it that means the housing is good) How do I remove the old bearing? Press it out and press in the new one?

 

[Faztbullet]

How do I remove the old bearing? Press it out and press in the new one?

Put new bearing in freezer for about a hour...then put bearing housing on top of a coffee can and heat in oven at 375 degrees...wait and you will hear a plop inside can. Remove new bearing from freezer, open oven and flip housing and drop new bearing in housing and then place outside to cool.

 

[slayer021175666]

I'm sorry. Are you saying to heat up the housing and the old bearing will fall out or do i need to press it out? Was I correct in assuming the housing is good if the old bearing is still tight in it?

 

[Faztbullet]

Are you saying to heat up the housing and the old bearing will fall out

Yep,,,,

Was I correct in assuming the housing is good if the old bearing is still tight in it?

Yep....

 

[slayer021175666]

Thanks! I have ordered a flywheel puller but, I am wondering, How do I re-install the flywheel? Does the puller tool install it as well?

 

[slayer021175666]

The motor serial number is OG503050. Would you know a part number?

 

[slayer021175666]

Bump

 

[Faztbullet]

You order a Merc puller???

 

[slayer021175666]

Seller was new on ebay and he never sent the puller. Ebay refunded my $$. Does it have to be a merc brand puller?

 

[Chigwalla]

"then put bearing housing on top of a coffee can and heat in oven at 375 degrees...wait and you will hear a plop inside can"
Thanks for that faztbullet, this old dog just picked up a new trick

It doesn't have to be Merc puller. A flywheel holder is worth buying as well, even though you can still do the job without one.
When you put the flywheel back on, it's just a keyed shaft (like a water pump) so the bolt draws it down.
You'll need a torque wrench (100 ft*lbs if memory serves)

 

[slayer021175666]

Anyone know a part number for the bearing?