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Catalina/Capri 25/250 Sailor's Forums

Catalina 25 Specific Forum

knotmeter replacement

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jm
Captain

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Canada
290 Posts

Initially Posted - 05/15/2002 : 11:37:11

Should I be able to unloosen the "wing nut" from the depth transducer through hull, push it down to create separation from the exterior hull, juice it up with some 5200 and tighten it back up ?

The knotmeter through hull looks a little different. It appears to have a collar and tube that support the "pinwheel" - I'm going to replace it with the available "blank" and use my GPS to track speed, but I don;t think this will cure the leak - can I unscrew and push the knotmeter unit down a bit and juice it up with some 5200 around the bottom end as well ?

If anyone has done this job, I'd appreciate any pointers. thanks.

Edited by - jm on 09/10/2002 14:19:13

Edited by - on

OJ
Master Marine Consultant

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USA
4382 Posts

Response Posted - 05/15/2002 : 13:04:31

It's my understanding that o-rings are also employed to make these units watertight - which you haven't mentioned. Have you talked with the manufacturer?
Polysulfide may also be a better choice as it cures with moisture.

Edited by - on

LeighMarie
Navigator

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USA
188 Posts

Response Posted - 05/15/2002 : 15:44:21

I had a huge issue with my knotmeter impeller leaking big time also. It was leaking because of old, worn-out o-rings. I replaced them (had a dickens of a time finding new ones, but I found some at Lowe's), greased it up with silicone grease and it doesn't leak a bit! I don't have a dummy plug for my unit so it was imperative that I get it fixed. It is a Datamarine and I guess they're not even around anymore to get o-rings through them. But, I could tell it was leaking through the 0-rings as that was where the water was pouring in inside the boat. For whatever it's worth....! Good luck!

Dave & Sharon on "Leigh-Marie"
Hull #5128

Edited by - on

n/a
deleted

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163 Posts

Response Posted - 05/16/2002 : 09:03:55

If you use 5200 you won't be able to remove the housing again. Use a polysulfide sealant.

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Champipple
Master Marine Consultant

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USA
6855 Posts

Response Posted - 05/16/2002 : 11:32:07

Charles,

You'll Be able to remove it, you just won't be able to use the housing again when you do remove it. If the O'rings are rubber or polymer do not use polysulfide as it will eat plastic and rubber. In My opinion, you only want this thing coming out when you muscle it out. Use the 5200.

DW

Duane Wolff
"The Flying Wasp"
C-25, #401 std,sk
Chief Measurer C-25/250 National Assn.
<img src="http://im1.shutterfly.com/procserv/47b2dc20b3127cce9cd2f45b211a0000004010" border=0>

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Mark Maxwell
Captain

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USA
329 Posts

Response Posted - 05/16/2002 : 13:12:05

Hi JM,
I re-bed my knot meter through hull last season. It was set in some type of mastik. After I cleaned it all out I used 3M 5200. Here are some photos of what mine looks like. I'm sure that there are different ones out there but maybe they'll help.

This shows the the pick-up and the plug next to the through hull. I use the plug when I have the boat out of the water to protect the paddle wheel on the pick-up.

<img src="http://im1.shutterfly.com/procserv/47b2db37b3127cce9d858355f6f90000003410" border=0>

This one shows the unit going into the hull and you can see thge gasket that I think everyone is refering to.

<img src="http://im1.shutterfly.com/procserv/47b2db37b3127cce9d85834477d80000003410" border=0>

installed

<img src="http://im1.shutterfly.com/procserv/47b2db37b3127cce9d85834df6e10000003410" border=0>

shows the plug next to installed pick-up

<img src="http://im1.shutterfly.com/procserv/47b2db37b3127cce9d858393f63f0000003410" border=0>

the through hull is set in 5200 and this nut is what holds it to the hull

<img src="http://im1.shutterfly.com/procserv/47b2db37b3127cce9d858000b6350000003410" border=0>

hope those help, I've got more if you have any other questions on these so far. Good Luck

Mark-
<img src="http://personal.jax.bellsouth.net/jax/l/c/lchaplin/unkarock/usflagwav.gif" border=0>
'Impulse'
C25 #533 DINN/FIN ~_/)~

Edited by - Mark Maxwell on 05/16/2002 13:15:28

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OJ
Master Marine Consultant

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USA
4382 Posts

Response Posted - 05/16/2002 : 14:24:11

Mark,
You are very kind and generous to take the time to post the above <img src=icon_smile_approve.gif border=0 align=middle> . Thanks dude!

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jm
Captain

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Canada
290 Posts

Response Posted - 05/17/2002 : 09:33:53

Ditto ! A picture is definetely worth a thousand words ! Your post is almost an encylopedia - thanks=1000

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OJ
Master Marine Consultant

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USA
4382 Posts

Response Posted - 06/05/2002 : 14:31:09

jm!

We're getting worried because we haven't heard from you!

How did you make out with the instrument thru hull maintenance?

Steve Madsen
#2428
OJ (Ode to Joy)

Edited by - OJ on 06/05/2002 14:38:46

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jm
Captain

Members Avatar

Canada
290 Posts

Response Posted - 06/05/2002 : 15:31:41

I'm on top, of the water. As indicated, I believe both of my leaks were in the area 'surrounding' the knotmeter and depth transducer, not through them. I put some 3m 101 around both,(on the inside) and it seems to have minimized the flow - I just get a small puddle in my bilge, nothing even 'pumpable'. I'm keeping some plugs handy just in case, and I'll probably wait until the fall haul-out to remove and re-install. Thanks for looking out for me.

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