Thermostat replacement

[moparlvr4406]

Wow you really believe that?
Now if it were moving fast enough that friction was causing it to heat up you may have a point, but the speed of the water in an engine is many orders of magnitude below that.

yes I do..so I guess we shall agree to disagree

 

[Westie]

yes I do..so I guess we shall agree to disagree

You should take some basic thermodynamics courses.

 

[moparlvr4406]

You should take some basic thermodynamics courses.

May look into that...
as for now I am going from 35 years experience in automotive and about 10 years of inboards
including my personal issue with a Merc 260...

 

[dpmulvey]

OldSkool,

do do you have the original manuals? Are they online? Or did you keep the very old T'Stat for sentiment sake? Answers I found googling your problem point to a 140* t'stat.

 

[SloBurn]

Negative !!
the lack of a stat will cause one to overheat also.. nothing slowing the flow to allow heat transfer

This was true for my old Silverline, (305 c.i.d. V8) too. The restriction from a T-Stat also forces more water to the manifolds and risers.
Haven't tried this in my SR 250 CC, though, and she also runs hot above 25 mph.

 

[Jetmart]

if the water moves through too fast it doesn't absorb and dissipate the engine heat as efficiently

This is not correct. So more cold water does less cooling then less cold water???
Nope.

 

[OldSkool]

It's not that the water temp is the issue but that there is still a bit of restriction through an open stat that will create flow to stagnate parts of the cooling system. I get that. If we do not restrict the flow in our brake cooling system then brakes will overheat on one side and run cool on the other side of some of our equipment. Path of least resistance kinda thing.

I believe I need a 140 stat instead of a 160. The 160 may be sticking a bit after storing with the coolant system drained. May be a little corrosion built up. I'll pull it out and let everyone know.

Thanks for all the comments.

 

[mbartlett!]

Did you figure it out? My twin engine 86 340 needs a thermostat. The searay service manual says 140 thermostat btw . How long does it take to replace the thermostat? Thanks for the help