Trojan Boat Forum

i was going to run my gen without the 2 thermostats and my mechanic says not to. I do not leave it running long at all--usually just to make coffee. Was going to replace then over the winter

Any thoughts

Thanks

A motor running without t-stats is not efficient among other things. Having said that, I've seen Onans running for years without them. People usually don't replace them due to expense or a misdiagnosed condition. Personally, I wouldn't run without them. Why are they being removed, what are the symptoms?

not to hijack this post,
but i ran across this as an option to the expensive onan oem thermostat part #309-0130 for the 6.5 mccck
i found 2 references on the internet stating the yanmar part#105582-49200 themostat is interchangeable with the onan. i found costs $24.00 each instead of $50 or so for the onan. has anybody substitued this or similiar in the mcck series

Would be nice if someone could confirm the Yanmar p.n. I may need to track one down and compare if not. Onan is stupid high.

here is a picture of the yanmar one, compare;

http://www.swdieselinc.com/Yanmar_Therm ... -49200.htm

Like Larry stated...take a look and decide for yourself. They look close enough to me, to work.
But there is also another Onan thermostat, a 140-145 degree which is part number 309-0130.

Yanmar Thermostat;



Sierra Thermostat; You can get at Worst Marine under number, 13480579 and Sierra number, 23-3606

Yup - I need the 140* stat as mine is keel cooled

I went ahead and sprang for the Onan ones for mine, not installed yet but have them as backup also points and plugs. Right now my Genny just hums so will leave alone.

Diverted Income wrote:Yup - I need the 140* stat as mine is keel cooled

keel cooled ? Are you sure ?

Parts manual shows it should have a 140* stat if it is (keel cooled) raw water cooled. 180* if fresh water cooled, two different p.n. 309-0130 vs 309-0289. Onan MCE. Am I missing something? (probably am)

You maybe raw water cooled (uses lake/bay water ) or fresh water cooled ( antifreeze w/ heat exchanger)

But I highly doubt You are keel cooled . A keel cooler uses coolant flowing through tubes or a exchanger that is mounted under the hull in the water . As a general rule they are not used on Planning hulls .Its a safe bet that Trojan never used them on a F32 .

Diverted Income wrote:....(keel cooled) raw water cooled......

Two completely different things!

Guess I figured (wrong) 140* so it would not precipitate the river crud into the water jacket if cooler than the 180* I am wrong again. Thanks for the explanation. Still on the search for the stats though!

I added keel cooler pic to my post above

So what would you guys recommend 140* or 180*??
Thanks!