Hi Dennis,
I will guess that the sprocket damage is as you
surmise, chain stop bolt riding past the limit.
Notice chain link gouge in port side housing too
when it rode up on the sprocket. I expect it was
an single event while backing down and the person
lost control of the wheel. There is enough
momentum there to put the wheel hard over in a second and cause the damage.
Your intuition is "bang on", reassemble without
removing the sprocket. Trying to get that
sprocket off the axle is flirting with disaster.
Reassemble exactly as before, as the damaged
teeth are not in the normally loaded area anyhow.
Cheers, Russ
ex - Sweet 35 mk-1
At 12:50 PM 1/23/2019, you wrote:
Well, I disassembled Touche's steering system
yesterday for a loooong overdue maintenance
session. As in it's never been done in 47
years! Touche's steering system is by Morch.
If you haven't checked your steering system,
maybe this will inspire you to do so.
Concern 2. Some of the teeth on the chain
sprocket were damaged. This was a complete surprise.
* This was apparently caused by the way
C&C/Morch made stops to limit the travel of the
rudder. They put a bolt at each end of the
chain. The bolts must have caused the damage when the wheel reached its limit.
* Note the two bolts with washers and nuts
through the links of the chain
here:Â
<https://drive.google.com/open?id=1nvJzh8xWDgetBCEE8eeOAtz4-up4ZvCf>https://drive.google.com/open?id=1nvJzh8xWDgetBCEE8eeOAtz4-up4ZvCf
Next steps. Â
* The sprocket. Hmmmm. The chain makes a
full 180 degree wrap over the sprocket. I
believe there are plenty of undamaged teeth
that will work. On the other hand, I could
try to get the sprocket off the shaft and have
a machine shop make a new one. I think that
would be a risky option. First, I'm not sure
how I would remove the sprocket. It has set
screws
(<https://drive.google.com/open?id=12GbE75ERXZGgz_NalJ93RcXf6rKvL5fi>https://drive.google.com/open?id=12GbE75ERXZGgz_NalJ93RcXf6rKvL5fi).Â
I removed a small one on the sprocket and a
larger one on a collar adjacent to it. I
suspect there is a keyway on the sprocket. It
showed no signs of moving. There are some
inventive ways to try to pull the shaft but
again, they all have risk. Then there's the
issue of the bearings. If I muck up the bearings, I'm screwed. Â
* Give some thought to a better way to stop
the wheel at the travel limits.
Dennis C.
Touche' 35-1 #83
Mandeville, LA
_______________________________________________
Thanks everyone for supporting this list with your contributions. Each and
every one is greatly appreciated. If you want to support the list - use PayPal
to send contribution -- https://www.paypal.me/stumurray
