Author Topic: Determining the lower bearing dimensions  (Read 1791 times)

Goboatingnow

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Determining the lower bearing dimensions
« on: December 02 2020, 12:21 »
Help , I provided my hull number to SVB ( Bavaria 36 2003 ) and they came back with a 68mm inner diameter bearing

Yet when I measure the rudder stock above the gland it’s a 60mm shaft

I’ve never had the rudder off and the delay means I need to preorder the bearing

Is the shaft a different diameter at the lower bearing ?

Thanks

Dave

HappyAfloat

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Re: Determining the lower bearing dimensions
« Reply #1 on: December 02 2020, 13:02 »

patdan

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Re: Determining the lower bearing dimensions
« Reply #2 on: December 02 2020, 13:29 »
Bonjour,

Yes the rudder stock should be of a larger diameter at the lower bearing place. I just done bearings replacement on my bavaria 42 cruiser from 2008. The new lower bearing has a 68mm inner diameter.  I am quite surprised that the same diameter is used for the 36 !! Industrial / purchasing process optimisation ?!

Daniel

tiger79

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Re: Determining the lower bearing dimensions
« Reply #3 on: December 02 2020, 14:48 »
Bonjour,

Yes the rudder stock should be of a larger diameter at the lower bearing place. I just done bearings replacement on my bavaria 42 cruiser from 2008. The new lower bearing has a 68mm inner diameter.  I am quite surprised that the same diameter is used for the 36 !! Industrial / purchasing process optimisation ?!

Daniel

Is that a crack on your rudder shaft, midway between the bearings?

patdan

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Re: Determining the lower bearing dimensions
« Reply #4 on: December 02 2020, 15:07 »
no crack only grease !!
Daniel

Salty

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Re: Determining the lower bearing dimensions
« Reply #5 on: December 02 2020, 20:51 »
Help , I provided my hull number to SVB ( Bavaria 36 2003 ) and they came back with a 68mm inner diameter bearing

Yet when I measure the rudder stock above the gland it’s a 60mm shaft

I’ve never had the rudder off and the delay means I need to preorder the bearing

Is the shaft a different diameter at the lower bearing ?

Thanks

Dave

For what it may be worth, at the end of 2011, having had my B36(2002) for a year, I had the yard change the rudder bearings, and I asked them to keep the old ones to show me when I returned a few weeks later. I kept those old bearings, I dont remember why, but I found them again in my garage a day or two ago. I didnt know or hadnt realised there was a step in the diameter of the rudder post until seeing the photo in one of the postings above, and so I have just been down to measure the old bearings.

The small bearing had the following dimensions:-
Internal Diameter  ............................40mm
Outside Diameter  ............................64.9mm
Height  ............................................40mm

The large bearing  had the following dimensions:-
Internal Diameter   ..........................67.9 - 68.0mm at one end
and ................................................68.1 - 68.2mm at the other end
Outside Diameter .............................97.9mm
Height ............................................60.3mm

Goboatingnow

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Re: Determining the lower bearing dimensions
« Reply #6 on: December 02 2020, 22:55 »
Thanks

So I can calm down and order the 68mm Roller bearing From jefa ( at half the price of SVB !!!)

I have to fit a tiller arm as I’m dumping the wheel pilot. So that’s at the 60mm part
Thanks everyOne

Goboatingnow

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Re: Determining the lower bearing dimensions
« Reply #7 on: December 03 2020, 09:25 »
FYI , Bavaria sent me this yesterday , useful to have