You might want to try
https://www.thehulltruth.com/boating-forum-14/
See full version: Mercury 40 hp 2 stroke thermostat
You might want to try
https://www.thehulltruth.com/boating-forum-14/
Sounds like yours is getting weak.
I’ve seen this in an evanrude. Where the guy didn’t spring for an OE impeller and went for a cheap ebay replacement. It would collapse . Got an original and it worked fine.
You must return items in their original packaging and in the same condition as when you received them. If you don't follow our item condition policy for returns , you may not receive a full refund.
Refunds by law: In Australia, consumers have a legal right to obtain a refund from a business if the goods purchased are faulty, not fit for purpose or don't match the seller's description. More information at returns .
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Thermostat Kit with Poppet here
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Fits the following 4 stroke models: here
Mercury / Mariner 4 Stroke Thermostat
Part no. 14586 here