'84 Merc 150 - V6 2.0 - Rebuild - Can't Get upper crank bearing out

[MAtkins]

'84 Merc 150 - V6 2.0 - Rebuild
Serial #: 6532700

I'm trying to replace the bearings on the crank.
I can't get the upper bearing out.

I've got a steel pipe that *just* fits inside the seat where the bearing is.
I've hit it multiple times with a sledge hammer (not *too* hard).

It absolutely will not budge.
How can I get that bearing out.

 

[racerone]

Re: '84 Merc 150 - V6 2.0 - Rebuild - Can't Get upper crank bearing out

Typically if you use heat from a propane torch they fall out of that housing.

 

[Faztbullet]

Re: '84 Merc 150 - V6 2.0 - Rebuild - Can't Get upper crank bearing out

Put it on a empty coffee can in oven at 350 degrees. it will fall right out. To reinstall heat housing and put earing in freezer and they will fall together after 45 minutes..

 

[MAtkins]

Re: '84 Merc 150 - V6 2.0 - Rebuild - Can't Get upper crank bearing out

Thanks - but I don't wear earings!! )

OK, heat and then freeze.
I've got MapPro gas; hope that'll do it.
Thanks.

 

[racerone]

Re: '84 Merc 150 - V6 2.0 - Rebuild - Can't Get upper crank bearing out

Aluminum expands at twice the rate of steel.------------Aluminum is 0.000012" / inch / per degree F if memory serves me right.-------So when heating the aluminum bore gets loose and the bearing falls out.--------When assembling you heat the bearing housing. ---You cool the bearing and the two can be assembled without using a hammer.

 

[Faztbullet]

Re: '84 Merc 150 - V6 2.0 - Rebuild - Can't Get upper crank bearing out

I meant bearings.....:stupid:

 

[MAtkins]

Re: '84 Merc 150 - V6 2.0 - Rebuild - Can't Get upper crank bearing out

Oh *b*earings - now I got it! lol

Your suggestions worked.
It took about a half hour in the oven @ 350 and I had to bang it out but it wasn't too bad.

I froze the new bearing and reheated the casing. The bearing dropped right in.
It's in there tight as can be now.

Thanks!!