F60 thermostat

[dark_star]

drill and tap
what did the stat look like and test out like?

Couldn't get the stat out, because the end of the bolt is stuck in there

[TownsendsFJR1300]

With that broken bolt gone (and no head securing the cover) , there's nothing holding the cover on but old age, crud, etc.

Pop it off...

See the Parts fisch (thermostat is is part #11):

http://www.boats.net/parts/search/Ya...201/parts.html

BTW, eventually, after inspection, you may see if there's any broken bolt sticking out IF the exhaust cover (part #14) is removed. This may result in more broken bolts should you go this route..

[dark_star]

With that broken bolt gone (and no head securing the cover) , there's nothing holding the cover on but old age, crud, etc.

Pop it off...

The other bolt is secure, what do you think ?

[TownsendsFJR1300]

So you only tried one bolt (that broke off) and stopped there?

Post #10 states the other bolt came out W/O a problem....

So one bolt is out, the other one, the head broke off, correct?

The cover should pop off, (IF I'm reading correctly).

Smack gently with a mallet, piece of wood, etc..

[dark_star]

So you only tried one bolt (that broke off) and stopped there?

Knowing I had one bolt broken, I tightened 2nd one back up.
so the housing is secure.
Just have to figure out the best method of replacing the broken one.

[dark_star]

By the way thanks for the advice all !

[TownsendsFJR1300]

Knowing I had one bolt broken, I tightened 2nd one back up.
so the housing is secure.
Just have to figure out the best method of replacing the broken one.

You might consider having a machine shop remove it for you, maybe $30.00.

In the mean time, pull the cover and thermostat and see if there's an issue with the stat..

**BTW, tightening up one of TWO bolts(especially if TIGHT), is a good way of warping that cover, ruining it...

[dark_star]

Thanks, I will source a machine shop after the holiday.

[TownsendsFJR1300]

Not asked yet, but does your engine oil smell like fuel?

That would confirm or at least point towards your fuel pump as noted above.

[dark_star]

might be a dumb question, is there any point in trying to thread in a shorter bolt ?
hoping to catch a few turns before it bottoms out ?

[TownsendsFJR1300]

Its not a dumb question...

Usually thou, unfortunately, the threads seize up the block, usually flush.

Peek inside the hole and see if there's any visible threads, there most likely isn't...

*As an FYI, in the future, if your trying to loosen a bolt (roughly within its torque spec's) and it does not want to move, DO NOT KEEP going or it will bust off...

Try using a penetrate, liquid wrench, etc, heat around the fastener, sometimes tapping the bolt itself to try and loosen it up. Others have used a freezing spray(I never have) to help break the molecular bond... But just brute force will 9 times out of 10, it'll bust..

[dark_star]

Thanks for the tips !

[99yam40]

the motor was designed with more than one bolt holding and sealing the stat cover in place.
it could start leaking at any time with one of the bolts gone. a major water leak under the cowling while running is never a good thing. everything gets coated with water and probably some getting sucked inside the motor.
fix it right to keep bad things from happening

there have been some discussions lately about the corrosion in the stat area of motors due to not pulling and cleaning them up as recommended by Yamaha ,along with the bolt & hole threads.
Taking apart and cleaning/testing/ replacing is all part of preventative maintenance

[dark_star]

Update:

My mechanic spent a couple hours using heat and impact on the 2nd bolt
as it was partially frozen as well.
the broken bolt was drilled out and the hole re-tapped for a larger bolt.

Thanks to all for the help !

[TownsendsFJR1300]

A heli-coil would have been as easy and stronger (same size bolt too) but that's moot at this point...

How's the thermostat look?