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-   -   Help with old Merc trim tab indicator cables (https://www.offshoreonly.com/forums/general-boating-discussion/378214-help-old-merc-trim-tab-indicator-cables.html)

Rookie 01-27-2023 06:06 PM

You don't plan on using your fitting correct? You are using 33c cables correct? Where are you getting these angles? With the Mercury kit (which is actually a cord grip) it's a straight travel and a little bend on the other side of the transom. Also the travel of the 33c cable should be more than that of the cylinder.

justintocars 01-27-2023 07:01 PM


Originally Posted by Rookie (Post 4857697)
You don't plan on using your fitting correct? You are using 33c cables correct? Where are you getting these angles? With the Mercury kit (which is actually a cord grip) it's a straight travel and a little bend on the other side of the transom. Also the travel of the 33c cable should be more than that of the cylinder.

I'll use whatever will work honestly. I got the angles by measuring them while mocking it up in the full up and full down positions. MERC had to split the difference on the angle of the cord grip. Every pic I have seen the cable its not at the same angle as the cylinder which has to put it in a bind somewhere.


justintocars 01-27-2023 07:17 PM


Originally Posted by Sutphil (Post 4857510)
There was old style hardware for these early tabs that secured the thru-hull cable in two places.

Do you happen to ha e a picture of one?

Griff 01-27-2023 10:56 PM


Originally Posted by justintocars (Post 4857617)
So the geometry of the cable is killing me if I drill the tab. I come up with 36* for the fitting, which is 11* of deflection for the end of the cable. Can they operate in that much of a bind?

Can someone mesure the angle or the fitting in merc tabs?

I'd drill and tap the tab like Rookie said. The cables can handle the angle just fine. Mine are 26 years old.

TexomaPowerboater 01-28-2023 12:08 AM

(20+) Marketplace - 1987 Cigarette 24 Firefox | Facebook

Saw this old firefox and looks like they used a 45 thru hull and then some kind of router that attached to the cylinder to get the angle right. Might be an additional option.

I had a circa 1990 and have a 1989 boat now and both have cables going thru a hole in trim tab mount

floatingphil 01-28-2023 07:22 AM


Originally Posted by justintocars (Post 4857700)
Do you happen to ha e a picture of one?

I`ll get a picture for you.

phughes69 01-28-2023 11:30 AM

I have old trim tabs like you. The cable housing attaches to the transom bracket with one iof these cable brackets and the end of the cable is attached to a ball stud that attaches to the K plane itself. And then the cable runs up and goes thru a clam shell above the waterline.

https://nuwavemarine.com/aftermarket...xoCouQQAvD_BwE


https://cimg8.ibsrv.net/gimg/www.off...499c1404de.jpg

https://cimg6.ibsrv.net/gimg/www.off...db00d63069.png
https://cimg7.ibsrv.net/gimg/www.off...54eb0e63ba.png
https://cimg8.ibsrv.net/gimg/www.off...8f8810a547.png

Ed 01-28-2023 06:34 PM

when you drill the hole for the cable to go through the transom, you need to first drill the hole, then come back & make the hole bigger/taller on the inside of the transom, so that the cable comes through & flows upward so it won't be bent at all. this goes for any through transom fitting that you put the cable through. seal it, when done, of course, with caulking.

Rookie 01-28-2023 07:24 PM

Also, when drilling out the new transom on my AT. I made up a batch of resin and MEKP and dipped pipe cleaners it and then used the pipe cleaner to coat the wood to add another protective barrier from water. Be sure to add tape so the resin doesn't run down the gel/paint. I did that for all holes and cutouts.
https://cimg8.ibsrv.net/gimg/www.off...f0bd083a04.jpg

floatingphil 01-29-2023 01:57 PM

https://cimg0.ibsrv.net/gimg/www.off...e04f9431e.jpeg
https://cimg2.ibsrv.net/gimg/www.off...ee51efea1.jpeg


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