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Mercury Marine

Thermostat Seal 26-F664914

Satisfaction rating 5 out of 5 (9 Ratings)
You save $1.38. (8%) $18.33
ONLY 2 REMAINING Ships Immediately

Product Description

Mercury factory part. Search for more factory parts & parts diagrams.

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9 Product Reviews

I originally ordered on the 26th of Jun. Crowley said the parts were in stock and I would receive them by the 6th of Jul. I don't believe all of the parts were in stock. On the 3rd of July I received an email saying it was taking longer to ship than normal and they would expedite it. On the 14th of Jul they sent me an email that they had shipped my parts USPS (no really my idea of expediting). We received the parts the 17th of Jul. Upon opening we realized that one of the three parts was incorrect. We emailed the company and received a quick response from Diego Mori who fixed our problem and sent the part very quickly.

If you’re not in a hurry to get your parts it ok. I did talk to two representatives about my order. One was helpful, the other person was useless and lack any people skills. At the end of the day, I received the right parts, but could have gotten them quicker at another vendor at the same price. Also, because of their delay, I received no credit on the shipping cost.

not to good it took over 2 weeks and then they shipped a partial order.

Mercury Force 75hp

Repair Difficulty
Repair Time
1 to 2 hours
Price was phenomenal! Took 2 months to get parts due to one item being back ordered otherwise would rate 5 stars. Will definitely purchase here again.

Problem fixed: No water flow after hitting sandbar

Removed lower unit and replaced water pump impeller. Removed and replaced thermostat, seal and spring. Reassembled.

1998 90 HP Force

Repair Difficulty
Repair Time
Less than 30 mins
Great service with hard to find parts for my 1998 90 HP Force Outboard Motor.




1989 Force 85 HP, 856X9H

Repair Difficulty
Repair Time
30 to 60 mins
My order was processed as I was told it would be. I had to wait a few days for non-stock parts. The order was complete when I got it and all the parts were correct.

Problem fixed: Overheat warning buzzer went of after prolonged irolling.

I pulled the t-stat out and put it in hot water and it opened, but I was suspicious of it and got another one with the gaskets. I pulled the overheat sensor out and put it in hot water. It sent out a ground like it should but would not return to normal state when cooled off. After several hours it was fine. I replaced it and no more problems.

Product Fitment Grid

This guide is to be used as a reference only. You must verify fitment using your model or serial number.

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Supersession Chain

Name SKU Superceding SKU
Seal F664258 F664914
Due to manufacturer policy OEM Mercury products can only be shipped to addresses within the United States.