Long shaft to short shaft

[gazzatop]

Hello
Hope some one can help me I have a short shaft engine on my boat that is playing up , I have been offered a
20 hp Johnson long shaft outboard engine . . it has , I have been told, a expansion section in it that is removed would make it short shaft.
I am not sure of the year of the engine but we think it?s a 70s- early 80s model.
Can any one tell me if it is easy to change the shaft length
thanks
Gary

 

[tashasdaddy]

Re: Long shaft to short shaft

i rather see you put a mini jack plate on the boat. there are too many if's in the equation, for a proper answer. drive shaft, shift shaft, water tube. this is probably the easiest and cheapest solution.
http://www.iboats.com/Mini_Jacker/d...65285068--list_time.1186398919--view_id.40133

 

[gazzatop]

Re: Long shaft to short shaft

Hi
thanks for the quick reply , checked out the link , the only problem is at the back of my boat its not stright it has a drop down bit(not sure what you call it ) would this still work ?

 

[tashasdaddy]

Re: Long shaft to short shaft

post a picture. it should work as it mount where the motor would. or you may have to put a spacer at the bottom. this may help gives a little more info.
http://www.thmarine.com/product.cfm?PRID=23

 

[MikDee]

Re: Long shaft to short shaft

I converted my Dad's 1962 Evinrude 40hp bigtwin short shaft to a long shaft, with a factory shaft extension kit, about 40yrs ago, it was quick and easy, and I was not very mechanically inclined back then. I don't know if the process is the same on your later model motor, but If it is anything like that, it's no problem, But try to get a definite answer if it is before you do it.

 

[reload]

Re: Long shaft to short shaft

It is not a big deal to convert, but I think what the op is talking about is that the motor came with the expansion built in. I am aware of the motor but don't know exactly what year it was started. I'm pretty certain the 1985's have it, not sure about earlier years.

 

[gazzatop]

Re: Long shaft to short shaft

thanks for the replies , i am going to have a look at the engine again tonight , can any one tell me where i look on the engine to fine the details as to the year , and model number ????

 

[reload]

Re: Long shaft to short shaft

Post the model and seriel numbers on here and someone will help you out.

 

[gazzatop]

Re: Long shaft to short shaft

Thanks will do that , can any one tell me where i should be looking for the model and engine numbers and what they are like , i have seen some but they look more like the part numbers

 

[darrklim2]

Re: Long shaft to short shaft

Depending on the year there should be a shiny silver plug about the size of a 50 cent piece in the side of the block with numbers stamped in it. Some had the numbers on a tag on the lower cowl under the carb. there are some other locations that I am unsure of.

 

[gazzatop]

Re: Long shaft to short shaft

hi
thanks . i have swaped every thing over and all looks fine . have run the engine in a bin of water and looks like it does what it should , the test will be at the weekend when i take it out i guess . now to try and find the year . i have got the number off the side of the engine C0021689 there is also a M above it if any one can help with the model and year that would be great
thanks

 

[F_R]

Re: Long shaft to short shaft

That is only the serial number. The C means it was assembled in Canada. Otherwise, it doesn't tell us much.

The M is OMC's logo.

 

[gazzatop]

Re: Long shaft to short shaft

ok thanks will check again , that was the number from the silver plug on the engine , i could not see any others but am not to sure where i should be looking