sort to long shaft conversion

[lanejumper]

is it possible to change my motor from a long shaft to a extra long shaft 20 to 25 inch it is a 77 javilin 85 hate to buy another engine the one i have runs great just not long enough called numerous boat shops a lot of them must be content with the business they have because they were extremely rude to me trying to come up with a solution to my problem if it can be done is it monetarily worth it and where can i get the parts to do this i have to out boards with the same problem if it is worth it i will convert both thanks

 

[Texasmark]

Re: sort to long shaft conversion

Not sure in the first place that OMC made a 25" shaft for that engine in '77. Shaft length has been a progression (seems to me) from 15" back in the 40's to 5" (housing extension) adapters to make 20" shafts (OMC) in the 50's and 60's, then 20's and seems like the last few years, 25's have become popular. Don't know if I have seen a 5" extension to fit a 20" shaft.

Regardless, the only connections from the lower unit that would have to be extended are the drive shaft, shift shaft, and water pump outlet tube.

The two shafts would require a trip into the lower unit whereas the water tube just plugs into the outlet of the water pump; course the water pump would come off to get the shafts out but....

Best I can do.

Mark

 

[F_R]

Re: sort to long shaft conversion

Not sure in the first place that OMC made a 25" shaft for that engine in '77. Shaft length has been a progression (seems to me) from 15" back in the 40's to 5" (housing extension) adapters to make 20" shafts (OMC) in the 50's and 60's, then 20's and seems like the last few years, 25's have become popular. Don't know if I have seen a 5" extension to fit a 20" shaft.

Regardless, the only connections from the lower unit that would have to be extended are the drive shaft, shift shaft, and water pump outlet tube.

The two shafts would require a trip into the lower unit whereas the water tube just plugs into the outlet of the water pump; course the water pump would come off to get the shafts out but....

Best I can do.

Mark

I don't know if it is possible on a '77 either. However, I think you will find that extension kits were a thing of the past on larger motors by then. If it is posible, and I don't know that it is, I would bet that you have to change the whole midsection as well as go into the lower unit to change the drive shaft. You are talking about big bucks to do the job. Real big bucks.

 

[mikesea]

Re: sort to long shaft conversion

they had both 20 and 25 inch,but ,the most commonly found is the 20in.Your best bet is to find a good used 25 in midsection AND lowerunit.Money is a consideration at tis point ,unfortunatly,if you were to use your own gearcase,you will need to locate a driveshaft and the shiftshaft to convert to the 25 in,you might find a salvage place that has older johnson/evinrude parts ,hopefully with a blown powerhead ,this enables you to smply swap the powerhead.You can go to the BRP website,that is where you will find all the numbers for parts to convert.They usually tell you if parts are avail new and price as well.Bottom line ,it can be done,will take some hunting for the parts

 

[lanejumper]

Re: sort to long shaft conversion

thanks for help will look for parts

 

[ezeke]

Re: sort to long shaft conversion

Actually, it is more complicated than that because in 1977 the type of midsection and lower unit used for the standard 85 and 115 were the older 1973-1977 type, and the longshaft X models used the new type midsection found on the 140HP motors. The PT&T units don't cross over.

To get it to work easily, you would need to find a X midsection and lower from a 1977 85 or 115 only, and you would need the newer PT&T to go with it.

To make it more interesting, they used a different gearcase (see the skegs) and different waterpumps (1 watertube vs. 2)