Transom clamp

[Boonie]

Is there a trick to removing these screws? It gets tight at the end of the threads. I don’t want to force it.

• This topic was modified 1 year, 9 months ago by Mumbles.

[Mumbles]

The threads tend to get distorted at the end where they meet the cup so using a thread file with the correct pitch to clean them up should work.

• This reply was modified 1 year, 9 months ago by Mumbles.

[Boonie]

Thanks mumbles. I have no thread files. Il have to go looking for one. Correct pitch I’m not sure about.

[lloyd]

If you have a die the correct size, you can screw the clamp bolt in and rethread the tip of the bolt.  I have also had luck just unscrewing  the clamp bolt into the threads of the clamp until it is tight, then screw it back in until it’s  loose. Then repeat the process over and over.  The threads of the clamp bracket will gradually reshape the bolt threads as it works it’s way through the bracket.  Use plenty of  lubricant and just don’t apply more force than you would if you were tightening the motor onto the transom.

[crosbyman]

to reinstall the cup   drill the shaft and  tap it  for a small flat headed bolt.  Apply blue thread lock

the end of the handle is  broken and  sharp….    just mix some  JB weld epoxy apply and shape it like a new handle….   finish with  sanding and some paint

Joining AOMCI has priviledges 🙂

• This reply was modified 1 year, 9 months ago by crosbyman.

[Mumbles]

The thread size is 5/8 X 11 and right now Princess Auto has thread files on for less than half price.

https://www.princessauto.com/en/thread-restorer/category/360-005-100-055

[olcah]

With care you can also use one of the shaped files in a cheapie pack of imported needle files to file the sides of the end threads.  Then run the thread in/out with lots of lube as described above.

[billw]

I think the thread file is the way to go, but it’s a little tedious. I have tried both a female thread chaser and a real die, ($$$$) to try to speed up the process. Both of them had a strong tendency to want to cross-thread, rather than find their way on to the existing, damaged thread. One thing I have been doing lately, with tight or frozen clamp screws, is to drill out the retaining pin for the handle, so I can use an adjustable wrench on the screw part. After the screw part is free, I have been putting the handle back on with a staked piece of 3/16″ aluminum rod stock, which is basically what OMC did in the first place.

Long live American manufacturing!

[Mumbles]

You didn’t mention what model motor this is off.  The smaller motors used 1/2 x 13 threads on the clamp screws.

 

[crosbyman]

Ha ! the big question again….

Would heat shrink the inside diameter  of the bracket  threads…..  allowing the shaft threads to pass more freely or….

would heat expand  the inside diameter of the bracket  threads…. preventing  the threads from passing more freely

based on the ball in the hole experiment below ….  heating the bracket fast enough BEFORE the shaft  also  heats up and expands

should  allow the shaft to   rotate more freely.  Freeze spraying the shaft while heating the bracket  would likely help.

 

what about just  freeze spraying    the shaft  ??

would it shrink the  diameter  of the shaft threads allowing the  shaft threads to pass more freely  ?  maybe

 

see  text below…. borrowed  on Internet….and a test I did in high school many moons ago

  Thermal Expansion – Ball And Hole

Purpose

To illustrate thermal expansion in a paradoxical way.

Equipment

Metal ball and hole on handles, burner with matches.

Suggestions

Before performing the experiment   students are asked:

When the plate is heated, will the hole get bigger, smaller, or stay the same size? Many people misinterpret the idea of expansion to believe that the plate will expand inward, making the hole smaller.

Images

Description

At room temperature the ball will not fit through the hole in the metal plate. When the plate is heated by a burner for about 30 seconds, the ball easily fits through the hole.

 

Joining AOMCI has priviledges 🙂

• This reply was modified 1 year, 9 months ago by crosbyman.
• This reply was modified 1 year, 9 months ago by crosbyman.

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