Stern bearing

Nov 18, 2001
17
Hello, Vega-Friends,

how can I change the stern-bearing without taking the shaft off?

Thank you for your hints.

Kind Regards Michael
 
Nov 8, 2001
1,818
It is possible but you have to take the prop blades off and the rack
which is a left hand thread on the control tube. Then the prop boss must
be removed. It is easier to take the combi apart as per the pdf
instructions.

Cheers

Steve Birch (Technical)
 
Oct 31, 2019
163
By expendind a great deal of effort! I don't know what the shaft connection is like into a combi-gearbox. But on our 'normal' set-up we only removed the proppellor once before deciding it was too much like hard work; ever since we've removed prop and shaft together, whenever we want to get the bearing or rope-cutter off.

Bob Carlisle, Spring Fever.

cecil_pigou cecil_pigou@... wrote:
Hello, Vega-Friends,

how can I change the stern-bearing without taking the shaft off?

Thank you for your hints.

Kind Regards Michael
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Nov 8, 2001
1,818
Hi Bob

The Combi is completely different, a much bigger job but you still have
to take the combi apart to change the bearing as the easier alternative.

Cheers

Steve Birch (Technical)
 
Oct 31, 2019
562
Hi Bob;
taking the shaft and sleeve out isn't that difficult- it
just looks like...
First you have to loosen the bolts holding the shaft; then
you have to unscrew the cover from the reversing box- that
gives you access the nut to loosen the 2 rings holding the
sleeve. Done! Pull out the shaft and sleeve. But don't
loose the key for the shaft, that daren thing is small and
easely overlooked (and when you put the shaft back in,
don't forget to put the key in too.)
Once the shaft is out, break a hack-saw in halve, and use
one piece to cut a V-groove into the old stern bearing.
With a screw driver you can take out the V-shaped piece of
bearing, and the rest of the bearing will collapse and come
out easy. With a piece of wood between the new bearing and
the hammer- pound the new one in- done!
Since the shaft is out- replace the bushing (there could be
two) and the 2 seal rings from the stuffing box. And there
are few O-rings... if you have a drawing, replace them too.
But remember- if you want to unscrew the sleeve- it's a
left hand threat! Always put some tape on the sleeve
because if you damage the sleeve- you'll hate to have it
done. Not sso much worry with the shaft- that is stainless
steel. (and harder)
Good luck!
Wilhelm, V-257
 
Oct 31, 2019
163
Steve Birch also posted to tell me that it's not so easy on a combi; which means that there are three viable alternatives: -
1. Buy a 'proper' gearbox - too expensive!
2. Buy a Beta/Yanmar Engine and gearbox - far too expensive!!!
3. My own favoured choice; get hold of the prop, rattle it a few times until convinced that the bearing's not as badly worn as first thought (if you can't achieve that state of mind; sink a couple or six beers and re-try) then put it back in the water so the problem's hidden.

Bob Carlisle.

WL wxt8981@... wrote:
Hi Bob;
taking the shaft and sleeve out isn't that difficult- it
just looks like...
First you have to loosen the bolts holding the shaft; then
you have to unscrew the cover from the reversing box- that
gives you access the nut to loosen the 2 rings holding the
sleeve. Done! Pull out the shaft and sleeve. But don't
loose the key for the shaft, that daren thing is small and
easely overlooked (and when you put the shaft back in,
don't forget to put the key in too.)
Once the shaft is out, break a hack-saw in halve, and use
one piece to cut a V-groove into the old stern bearing.
With a screw driver you can take out the V-shaped piece of
bearing, and the rest of the bearing will collapse and come
out easy. With a piece of wood between the new bearing and
the hammer- pound the new one in- done!
Since the shaft is out- replace the bushing (there could be
two) and the 2 seal rings from the stuffing box. And there
are few O-rings... if you have a drawing, replace them too.
But remember- if you want to unscrew the sleeve- it's a
left hand threat! Always put some tape on the sleeve
because if you damage the sleeve- you'll hate to have it
done. Not sso much worry with the shaft- that is stainless
steel. (and harder)
Good luck!
Wilhelm, V-257
 
Oct 31, 2019
562
You worry too much! I've taken that thing apart quite a few
times. I own my Vega almost 30 years.
Taking off the prop doesn't really help you much. How would
you take out the old bearing? (bushing)
You need to remove the sleeve and shaft. And once those are
out, you can also put new parts into the stuffing box, and
have no problems for the next 5 to 10 years. Just make sure
the shaft is well adjusted. It MUST run round, otherwise
the bearings will be out sooner. You can check that easy:
run the engine for a while, when the sleeve (shaft) gets
hot, then there is a bend and you need to streighten the
shaft. (adjust the motot mounts).
I just recently took out the shaft and replaced everything
even though the stern bearing didn't really need to be
replaced (the last time I did this was about 1997). But I
did replace everything- all bushings etc. Those parts cost
so little, but once the shaft is out it makes sence to
replace everything.
Good Luck
Wilhelm, V-257