Cutless and rudder pintle bearings

[Kyeemah]

Anyone know the standard (original) dimensions for a C28 Cutless
bearing and rudder pintle bearings
Ian

[GregB]

I can answer for a C29.
The shaft OD is 1.000 ".
The rudder bottom pintle is also a 1.000". and the bush in the cast
bronze fitting that positions the lower end of the rudder is a
sintered bronze bush ID 1.00" and OD 1.25" length about 1". I
increased the bush ID to a clearance of 0.006" by using a emery flap
wheel in a drill. You should accurately measure the OD of the pintle
to set the clearance. The bronze fitting was held in place by two
copper rods that were peened at each end. I replaced these with type
304 SS bolts Dia 5/16", penny washers and nylock nuts. The bolts
lengths were 3" and 3 1/2" due to the taper in the bronze casting.

Greg B

[HarbourHack]

Hi Ian,

I did my cutless bearing on my C28 back in March. Took 2 of us to get
the prop shaft out. Something of a squeeze in there. Just as well I'm
not fat! With the shaft out just cut a piece out of it with a hacksaw
blade & it will surrender its position readily. With the old one
removed I measured 35mm (1 1/4") I.D ie: 1 1/4" O.D. bearing with a 1'
I.D. ie:1' prop shaft. However, this size in bearing material was a
sloppy fit in the boat. I ended up getting a 1 1/2" piece & we, that
is David Dee & I (what a terriffic bloke he is!), sanded it back with
some coarse wet & dry until it fitted. I had a piece cut to about 7'.
Got it from D.H.Porter in Parramatta.
My rudder bearings are fine so I have nothing to add to that -
yet...Good luck!

Scott

On Jun 30, 12:11 pm, Kyeemah <i...@denley.com.au> wrote:

[Maeling]

Scott, Good to hear a good report on David Dee, I've found him
excellent

I'll record the C28 details somewhere. Off the Net I found someone in
Oz listing standard sizes for stern bearing bushes. They seem to go
up in 1/16" graduations. I know mine is 1 11/16" OD 1" ID

C29 Rudder gudgeon BRONZE! I wonder if fabricated SS came along at a
cheaper price and later boats have SS gudgeons - like mine.

To fix my gudgeon, I use 5/16" Whit 304 threaded rod cut to length and
plain nuts. These are set in generous silicone which I hope with AF
paint glues the nuts in place. The first set lasted 25 years.

Geoff Raebel

[Kyeemah]

Thanks Guys. A great help. I did email Porters asking if they knew the
sizes (given they will have done a few). But no response yet. Geoff, a
table of standard sizes for 28/29's would be fantastic. Maybe Don Lees
has something.
Even things like chainplate pin diametres are handy. I got some metric
gear from overseas and the pins would not fit (imperial sizes on the
boat).

[Kyeemah]

Scott. To clarify, the length of the cutless bearing put back in was
about 7 inches?

[HarbourHack]

Yep. The piece we took out was lucky to be 3" long. Too short.
Methinks they ran into the same trouble we did putting it in & simply
cut it off with a bit of "she'll be right, mate" for good measure!
6-7" was the length recommended. They just cut it to size. You may do
better calling Porters. Nice folks but busy. You can find out what you
need to know pretty quickly that way. Don't know if anyone else
supplies the material in smaller fractions. Might save you a bi of
time & some R.S.I!

On Jul 2, 4:02 pm, Kyeemah <i...@denley.com.au> wrote:
> Scott. To clarify, the length of the cutless bearing put back in was
> about 7 inches?
>
>
>

> > I had a piece cut to about 7'.- Hide quoted text -
>
> - Show quoted text -

[Maeling]

Scott, was just putting the numbers together to put on the Page and
thought for a moment - I" shaft running in a 1 1/4" OD bearing! That
only leaves an 1/8" for the shell and or bearing material. It doesn't
seem enough. I know my C29 may be non-standard but I have a bit over
a 5/16" wall on my bearing. There is a photo in the detail album.

Geoff Raebel

On Jul 2, 6:06 am, HarbourHack <sbickfo...@optusnet.com.au> wrote:

[HarbourHack]

G'day Geoff.

Yep that sounds a bit odd doesn't it?
I have the piece of material I didn't take back to Porters here.
Definately 1' I.D. Wall thickness is 4.8mm - my cheap digital calipers
only read mm!). That's an overall o.d. of 35mm. And remember that it
was loose in the shaft hole - copper tube - in the keel. So whatever
size was next up I got & brought it down to size.
Sorry about the confusion. Lost in the conversion. Now I know how they
felt at Airbus...

Scott.

> > > Ian- Hide quoted text -

[Djarraluda]

Can not comment on the cutlass bearing, but 18 months ago I did find
the gudgeon a tad loose on the hull.

After years of no electrolysis, it appears that there were some
changes somewhere and suddenly I found a few holes in the prop.
Whilst on the slip, I noticed the bronze gudgeon was loose on the
hull. It was held with copper rivets and roves!

Being averse to mixing metals, I replaced the copper fastenings.

6 months ago, when last on the slips, all was perfect and no sign of
electrolysis. These things are strange and can be related to adjacent
boats but this is rare on a swinging mooring. I had changed from Altex
antifoul to Micron at the boatyard recommendation, but have now
changed back as its performance was extremely sub standard. I will
monitor all closely for a couple of years, but suspect it was an
anomally that I will not be able to explain.

Roger

> > - Show quoted text -- Hide quoted text -