1959 Mercury Mark 400 questions.

[DeepCMark58A]

I have a question on prop installation. Currently there is the prop, then a washer that meshes with the slots on the cone nut. There seems to be about a 1/4" gap between the prop and the nut. Is that normal or is there a spacer? I have the 11 spline prop shaft.

 

[DeepCMark58A]

No Title

Here is a photo, with the cone bottomed out on threads.

 

[Chinewalker]

Do you have the thrust washer in place? It will be a small thick washer with splines, seated ahead of the prop on the shaft.

 

[DeepCMark58A]

See that is excellent information when I picked up the motor the thrust washer was on the outside of the prop vs where you suggested it goes on before the prop. Will give that a whirl.

 

[DeepCMark58A]

Next question, the boat I bought has a tach mounted in the dash, I want a working tach so my question is this I have seen tach modules for sale on e-bay but for newer motors than my 59. Is it possible to hook up to the ignition system to my existing 2 wire tach?

 

[Chinewalker]

If your motor has an alternator, you might be able to make it work with a modern tach. Otherwise, you'll need an older style that gets signal from the magneto OR an inductive tach that runs off of a spark plug wire (like a Tiny Tach).

 

[DeepCMark58A]

I have an old air guide tach 2 wire, and I was told that the 400 has the alternator, so it should be a matter of figuring it out.

 

[DeepCMark58A]

Do you have the thrust washer in place? It will be a small thick washer with splines, seated ahead of the prop on the shaft.

Upon further review the washer that is splined goes on the outside of the prop, it will not go on before the prop due to the shaft not being splined in that spot. Sounds like I need to find a thrust washer that is 11 splined.

 

[Chinewalker]

No Title

I believe the old part number for yours is 12-25251, called a backing washer, approx. 1/8 inch thick.

 

[DeepCMark58A]

Where did you find that info? I really would like to buy a book with motor and year specific info and diagrams. I like pages and books over screens.

 

[Chinewalker]

Right here:
http://pub9.bravenet.com/photocente...m=49536#bn-photocenter-1-1-737212788/50456/1/

Good, hi res scans, too. They should print pretty well...