Z200TXRB lower mount bolt removal

[railroad124]

Hi All,

I have a 200 HPDI and noticed the lower mount bolts are rotted badly. I'm hoping to make it through this season and do this project in the fall. Anyone have experience with this repair? I see the bolts can't simply be removed because of their position. Any other things to be checking for on my adventure while I'm in there so I can kill multiple birds with one stone?

As always, any information is appreciated.

Thanks,
Rob

[fairdeal]

Yes, installing new bolts as they are intended is a bit of a project;
the powerhead needs to be removed to access the upper bolts

then after all four nuts are removed,
everything including the four bolts can be pulled back.

I have heard of some DIYers leaving the powerhead/upper bolts untouched,
Sawzall-ing the lower bolts to where they can be driven out,
then installing new bolts "backwards":
with the bolt head facing forward, and the nut in that cavity of the lower unit.
I don't know if there is space to do that on this model...

Personally, I would not be inclined to mess with them at all;
thinking that the propeller is constantly forcing the assembly forward,
so that (except for when in reverse) that bolt head is not doing very much.

But I suppose if it gets to the point where that bonding wire is no longer attached,
something needs to be done.

[robert graham]

Why would Yamaha choose to not use stainless steel bolts, especially in such an unserviceable location on the motor???

[railroad124]

Yes, installing new bolts as they are intended is a bit of a project;
the powerhead needs to be removed to access the upper bolts

then after all four nuts are removed,
everything including the four bolts can be pulled back.

I have heard of some DIYers leaving the powerhead/upper bolts untouched,
Sawzall-ing the lower bolts to where they can be driven out,
then installing new bolts "backwards":
with the bolt head facing forward, and the nut in that cavity of the lower unit.
I don't know if there is space to do that on this model...

Personally, I would not be inclined to mess with them at all;
thinking that the propeller is constantly forcing the assembly forward,
so that (except for when in reverse) that bolt head is not doing very much.

But I suppose if it gets to the point where that bonding wire is no longer attached,
something needs to be done.

I'm not big on shortcuts but that way seems like it makes sense to me. I can't think of any difference in the performance of the bolts based on their orientation providing all the hardware (washers and bushings) are properly installed. Can you?

[fairdeal]

I can't think of any difference in the performance of the bolts based on their orientation providing all the hardware (washers and bushings) are properly installed. Can you?

No, unable to imagine some "functional"/"performance" difference
when the engine is 'in use'.

Obviously the way Yamaha does it, the bolt is 'held captive" -
but other than making replacement difficult -
to what effect?
does it help on the factory "assembly line"?
Or does it just make an engineer feel good,
that it can never "fall out"?

[railroad124]

Well, I'm going keep it as is for now, make this a fall project and enjoy my season.

You do the same fairdeal !!!