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Old 13 March 2016, 14:50   #1
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Country: UK - Wales
Town: abergele
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Make: ribtec 3m
Length: 3m +
Engine: tohatsu 9.8 hp 2st
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johnson 15hp

Hi all picked up a johnson 15hp year 2000, I have ordered a new thermostat as it was missing could someone tell me which way around it goes in please I have the inner houseing and a large spring inside
Many Thanks
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Old 14 March 2016, 09:48   #2
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Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
Length: 5m +
Engine: Merc 60 Clamshell
MMSI: 235068449
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Hi Slate,

I don't know these engines that well, but a big spring sounds more like a poppet valve than a thermostat to me......

google "boatinfo.no" - there are a ton of workshop manuals on there.
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Old 14 March 2016, 11:06   #3
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I don't know this particular engine either but I wonder... by chance has someone removed the thermostat but left the spring part of the stat in place? Normally on other motors the stat return spring is fixed within the stat but if it all came apart due to corrosion perhaps the previous owner pulled all the parts out but thought the spring should stay. Just a long shot??

EDIT: Just looked up a parts diagram and if it's this one it appears the thermostat capsule, spring, etc are all supplied as separate parts... not seen that before.

http://www.marineengine.com/parts/jo...p%3B+Crankcase
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Old 14 March 2016, 13:45   #4
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Country: UK - Wales
Town: abergele
Boat name: all mine
Make: ribtec 3m
Length: 3m +
Engine: tohatsu 9.8 hp 2st
Join Date: Sep 2012
Posts: 275
Thank you both, I have had a look at the parts list I have a thermostat on order from fleebay now I just need diaphragm, and hoping it will get 2 1/2 people on the plane, fingers crossed
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Old 15 March 2016, 13:19   #5
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Country: UK - Wales
Town: abergele
Boat name: all mine
Make: ribtec 3m
Length: 3m +
Engine: tohatsu 9.8 hp 2st
Join Date: Sep 2012
Posts: 275
Just to follow up fitted the new thermostat all working as it should, its a very small thermostat when i sit it next to one from a 8hp evinrude.
Thanks again
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