Don Schwader
Member
I have a 1981 Evinrude 25hp Short shaft tiller and I need to switch it over to long. I have the parts now to do this are there any tips you guys can offer to make this easier? Or is there a book or website that might help?
making a short shaft outboard into a long shaft
- Thread starter Don Schwader
- Start date
Huntindave McCann
Well-known member
Don
The BRP website has real good exploded views which will guide you thru the whole process. No instructions but the exploded drawing will show how everything goes together. Here is a link, after the page loads, scroll down to "1981" and click on it. Another page will load where you scroll down to "25hp"and click on that link. Finally you will need to select your engine model to see the particulars for your engine. The "L" in the model numbers denotes "long shaft". So by comparing your engine to the same model + having "L" in the number, you will be able to see the exact differences.
If you run into any snags, post up and somebody will surely be able to help you out.
The BRP website has real good exploded views which will guide you thru the whole process. No instructions but the exploded drawing will show how everything goes together. Here is a link, after the page loads, scroll down to "1981" and click on it. Another page will load where you scroll down to "25hp"and click on that link. Finally you will need to select your engine model to see the particulars for your engine. The "L" in the model numbers denotes "long shaft". So by comparing your engine to the same model + having "L" in the number, you will be able to see the exact differences.
If you run into any snags, post up and somebody will surely be able to help you out.
Steve Stevenson
Member
Dave, is it possible to go the other way(factory long shaft to short)? I have access to a 25 long shaft cheap but I need a short shaft. thanks, Steve
Huntindave McCann
Well-known member
Steve,
Depends on the motor. Some motors use a spacer to extend the housing and longer shafts and linkages to handle the rest. Taking out the spacer and switching to shorter components can be done also. Some motors do not use a spacer and changing these over ir a more complicated and expensive proccess.
A lot depends on what your componet cost will run and is it then cost effective to do the switch.
Depends on the motor. Some motors use a spacer to extend the housing and longer shafts and linkages to handle the rest. Taking out the spacer and switching to shorter components can be done also. Some motors do not use a spacer and changing these over ir a more complicated and expensive proccess.
A lot depends on what your componet cost will run and is it then cost effective to do the switch.
harry whitley
Well-known member
I've done it twice. Both were 25 hp johnson/evinrudes and it wasn't real difficult. Actually it is pretty intuitive. You need the book or someone who knows how to help you along.
Also while you are doing that you might as well change out the impeller.
What Dave says is right on,
Harry
Also while you are doing that you might as well change out the impeller.
What Dave says is right on,
Harry
Tom Scholberg
Well-known member
takes me back to a day a couple years back when I spent the morning changing a long shaft 35 to a short shaft 35 and then the evening looking for a short shaft 35 in the lake bottom. Tighten your clamps!!!!!!!!!!!!!!
Steve Stevenson
Member
Dave, thanks for the reply. One more question, is it obvious from looking at the moter if it has a spacer. this is an OMC motor by the way. Thanks again, Steve
Huntindave McCann
Well-known member
Steve
OMC should use the spacer. Look at/near the cavitation plate for a series of bolts then look about 10inches above that for a second set of bolts. Two series of bolts like that mean there is the spacer to remove. Again, check BRP's website for detailed drawings. You should be able to see exactly what I am describing. I'd cut and paste a drawing for you but don't have the time right now.
OMC should use the spacer. Look at/near the cavitation plate for a series of bolts then look about 10inches above that for a second set of bolts. Two series of bolts like that mean there is the spacer to remove. Again, check BRP's website for detailed drawings. You should be able to see exactly what I am describing. I'd cut and paste a drawing for you but don't have the time right now.
Steve Stevenson
Member
thanks, I'll check it out Steve