1988 75 HP Evinrude lower unit removal

[gentryrf]

I've read several posts on here on this subject here including jtexas recent procedure on 4/02/10. I've removed all seven bolts and disconnected shift rod. Read in another post about pulling spark plugs and turning flywheel to help spline come out. Done all of that and lower unit will not drop but about 1/4". Anymore suggestions greatly appreciated. Thanks

 

[wilde1j]

Re: 1988 75 HP Evinrude lower unit removal

Saltwater motor? Driveshaft splines may be stuck/rusted in the the crank.

 

[gentryrf]

Re: 1988 75 HP Evinrude lower unit removal

No actually to my knowledge has been in fresh water entire life, I just purchased a couple of years ago but believe the boat stayed at Toledo Bend Lake. If spline is rust in crank, any idea how to get it loose?

 

[DJ]

Re: 1988 75 HP Evinrude lower unit removal

You got the bolt hidden above the trim tab (fin above prop.) right?

If so, you will have to GENTLY keep applying downward pressure from various angles.

Make sure your toes are not under the skeg when it does drop.

 

[gentryrf]

Re: 1988 75 HP Evinrude lower unit removal

Yes got the hidden bolt under trim tab. Guess I just need to get some help (more muscle). Don't want to beat or pry on it.

 

[DJ]

Re: 1988 75 HP Evinrude lower unit removal

Keep moving it back up and down. You can pry it-G E N T L Y.

 

[gentryrf]

Re: 1988 75 HP Evinrude lower unit removal

OK, I'll keep at it I guess, got it down about 3/8" now:redface:

 

[wilde1j]

Re: 1988 75 HP Evinrude lower unit removal

If you get it loose, make sure to use moly grease on the splines and replace the driveshaft 'O" ring, if your motor uses one on re-assembly. I've had some motors where I had to resort to using oak wedges driven between the mid section and LU to get the LU to drop. Be patient so you don't break anything.

 

[gentryrf]

Re: 1988 75 HP Evinrude lower unit removal

Thank you all so kindly for your help, wooden wedges seemed to do the trick, came right off this morning once I got a bind with the wedges and pryed lightly with screw driver. Next problem is impeller looks fine to me, any ideas what else might cause it not to flow water?

 

[wilde1j]

Re: 1988 75 HP Evinrude lower unit removal

Had it be cooling properly until recently w/o any issues or any work done recently? Tell us about the recent history.

Ok, lots of possible causes:
a) pump body or wear plate scored
b) rubber grommet folded over in pump outlet
c) water tube not in pump outlet
d) water tube kinked
e) blockage in cylinder head
f) thermostats or vernatherms not opening on temp increase
g) flow diverters swollen, in wrong or missing

 

[Cofe]

Re: 1988 75 HP Evinrude lower unit removal

Could also be a water pump impeller key sheared, or the hub in the impeller is loose.

 

[wilde1j]

Re: 1988 75 HP Evinrude lower unit removal

And probably a few more as well ...

This is when an OEM shop manual pays for itself.

 

[Cofe]

Re: 1988 75 HP Evinrude lower unit removal

And probably a few more as well ...

This is when an OEM shop manual pays for itself.

Totally agree wilde1j!

And let's not forget the obvious, "critters making a home in the tell tale hose."