| Subject: |
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Re: Re: Re: Re: Re: support bearing |
| Name: |
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Maarten Jansen |
| Date Posted: |
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Nov 19, 06 - 11:07 AM |
| Email: |
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mcmjansen@zonnet.nl |
| Message: |
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Finally removed the bearing!!
I will try to describe the work sequence:
Remove the rudder. (Remove the bolts and nuts from the rudder flange first Lift it up with a jack, place a wooden spacer under the rudder yoke in the steering gear compartment. Lower the jack a bit and then lift the rudder blade sideways out of the pintle. This is a two men job as the rudder blade is quite heavy.)
Dismantle the flexible coupling. (This largely depends on the type of coupling you have, check the manual)
Loosen the bolts of the support plates at the bulkhead.
Remove the bolts of the bearing housing at the backside of the bulkhead (in the cellar).
Pull the shaft backwards at the the propeller.
Remove the clamping ring that prevents the bearing from moving forward. This is a bush which is fitted to the shaft by means of 2 allan keys. Easy to remove.
There should be enough space so that you can get at the front side of the bearing to loosen the tightening nut. This nut is used to keep the roller bearing in place and tighten the conical bush to the shaft.
The bearing is fitted to the shaft with a conical bush. When you tighten the nut, the conical bearing inne flange pushes the conical bush to the propeller shaft. The tighter the nut, the greater the clamping force.
The dismantle the bearing you have to remove the nut first. The nut is secured by a lip-ring.
Find the spots where the lips have been pushed into the grooves of the nut and push them back with a screwdriver/hammer. Loosen the nut by hammering a screwdriver or driver in one of the grooves. The nut should come loose relatively easy.
The problem you may face is that the bearing housing is full of grease. The grease should be removed first so you can see the diferent parts of the bearing.
Now that the nut is loose the bearing should be able to slide of the conical bush.
This sounds easy but i needed a big hammer to get it moving.
Hammer from aft to forward and it needs a great deal of strength. (Note: protect the shaft from possible blows. Put a cloth around it just before the bearing housing.)
Once the bearing slides from the bush, you can push the whole thing forward and take it out from the forward side of the shaft. It is necessary to pull out the shaft further so that the forward end of the shaft is way behind the bulkhead.
According to calculations it it not necessary to fit such a bearing to support the shaft. It may be there as thrust bearing but with modern engine mounts and flexible couplings this is not necessary any more.
Our Banjer has a big Centa flexible coupling which could cope the thrust.
I will try to fit it all together again and leave the bearing out. All the parts will still be on board so that in case it does not work, I can fit it again.
Will keep you posted.
Maarten Jansen
Banjer #12 |
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