Contact Us
My Account
Search Over 1 Million OEM Parts
Most parts in stock- Same day fulfillment
Where is my model number?

Select your engine to find guaranteed-fit parts:

Thermostat (120 Degrees) 14586

Satisfaction rating 5 out of 5 (93 Ratings)
$33.99
You save $1.18. (3%) $35.17
5+ IN STOCK
Ships Immediately
  • This is an OEM part manufactured by Mercury Marine
  • Flat rate shipping starting at $4.95
  • 30 day return policy
    •
Mercury logo

Product Description

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

Take a look inside

Service Manual General Information [Special Tools-Sealing Agents And Lubricants] [1986]

This product is mentioned in 1 document:

General Information [Special Tools-Sealing Agents And Lubricants] [1986]
Refresh

1 Product Questions

Do you have the gasket that goes with the thermostats? I was provided (by another vendor) a gasket that does not match what is on the engine. For Serial Range Mariner Outboard 125 (4 CYL.) [ 0G760300 THRU 0T979999 [USA] ]

CD

Answer:

Hello, Yes we have the gaskets for the thermostat. Thermostat Cover Gasket 27-19205002 https://www.crowleymarine.com/parts/2080.cfm?clearcache & Thermostat Cover Gasket 27-14318005 https://www.crowleymarine.com/parts/2688.cfm?clearcache We also have a Thermostat Kit which includes the thermostat and seal. Thermostat Kit (120 Degress) 14586A3 https://www.crowleymarine.com/parts/8149.cfm?q=14586A3 Regards!
Refresh

93 Product Reviews

Great service, parts arrived in good order and time. Pleasing to have stuff travel halfway round the world in a matter of days.
by

Awesome
by

Fast and great service. Had one item not in the package and after sending an email it was expedited fast without any argument.
by

by

Mercury 90 elpto

by

I received the parts as ordered in a timely manner.
by

Everything went exceptionally well - very helpful when I called multiple times to add items to my order, shipped on time. Definitely will buy again when I need.
by

Great service
by

Quick Shipping, Correct Name Brand Parts And Easily Navigable To Find The Parts For Your Motor
by

Good source for marine parts. Good communication and rapid shipping.
by

The exploded view diagram of the parts is very helpful.
by

by

by

by

Great experience, parts came as ordered. Will definately order more as needed.
by

Mercury 90 ELPTO

Repair Difficulty
Easy
Repair Time
Less than 30 mins
Excellent
by

Problem fixed: Overheat alarm

Replaced t stat and poppit valve.

by

by

by

Mercury 75

The parts were shipped on time and when promised. Crowley Marine is my go-to.
by

Mercury 125hp 2 stroke 2004

by

Great! Although a couple of items weren’t in stock and took a little longer. Great place to do your business
by

Mercury 60hp

Repair Difficulty
Medium
Repair Time
30 to 60 mins
Great! Parts that fit and function as they should! Although it took a little longer to get to me due to COVID then normal, Crowley is still the only place to deal with!
by

Problem fixed: Six or eight different repairs on my 23 year old engine

I needed to service my 23 year old engine’s cooling system and one of the carbs. Replaced the thermostat, poppet valve and water pump. Except for the pump, the rest are original parts. Additionally, I needed to rebuild one of the three carbs which is not working as it should. All three were rebuilt three years ago but the lower one is failing again. I replaced the needle valve as well as the float and all the gaskets. Crowley has all the parts I needed including the attenuator’s missing bolts and inlet seals.

Good service. Right parts
by

Allgood.
by

mercury 25hp

Repair Difficulty
Medium
Repair Time
More than 4 hours
good
by

Problem fixed: brother tried to fixed, than wouldn't go in gear.

pull starter, pulled pin. pulled lower uint. Brother put impeller in, I replaced one seal, and washer, put it back. than fixed carburetor primmer bracket, and new than new thermostat.

by

Look at my first estimated delivery time and look at when i received it i guess it would still be there if i hadnt called on the 17th day thennit was overnighted and i got it a week later no further comment i will not be ordering again
by

Merc 90 3cyl

Repair Difficulty
Medium
Repair Time
30 to 60 mins
Very fast shipping, thanks
by

Problem fixed: Low water output

Removed lower unit. Remove SS waterpump housing and shaft seal. Inspect housing, and base plate.Discard old pump impeller. New housing gasket,new impeller ,then SS housing, turning driveshaftclockwise until impeller seats inside SS housing.Reinstall shaft seal and 4 bolts on housing. Reinstall lower unit.👌

very good fast shipping. thank you. you got me on the water in time👍
by

by

It has been really great purchasing from Crowley Marine. I want to say thank you for having such great customer service and on-line ordering.
by

by

Mercury 75 hp

It was a great experience with your guys I will keep buying from you guys
by

25hp mercury

by

Johnson 15 Mercery 125 Yamaha 200

Repair Difficulty
Easy
Repair Time
30 to 60 mins
Great!!
by

Problem fixed: serveral, mostly tune-ups

Maintenance on all 3 motors, 2 of which are older motors.

Very courtious and helpful. Good selection.
by

A+ I have always been able to get what I need for my older 25hp Mercury outboard.
by

Mercury 90hp

by

Great service always
by

by

Good
by

by

Helpful and friendly. I always compare prices and shipping costs among 4 or 5 suppliers and Crowley usually has the lowest combined cost, plus I don't have to wait a couple of weeks to receive my parts. They're willing to work with the customer if you have issues with the order. I don't mind dealing with these folks.
by

25 mariner

Great product, fast shipping, great communication.
by

Quick delivery, helpful parts diagrams, fair prices.
by

by

Mercury outboard

Repair Difficulty
Easy
Repair Time
Less than 30 mins
The right parts shipped quick, just what I wanted
by

Problem fixed: Season prep

Changed out the thermostat and water pump to insure a problem free season

Good service when ordering parts and good price. Had to call customer service about a change in my order. The attendant made the change and straighten out my order in minutes.
by

Great no problems
by

2001 90 HP MERCURY ELPTO

Repair Difficulty
Medium
Repair Time
2 to 4 hours
by

Problem fixed: LEAKING CYLINDER COVER

REMOVAL OF COWL. REMOVAL OF CYLINDER COVER AND COMPONENTS. CLEAN/REMOVE OLD GASKET. TIME CONSUMING TO THOROUGHLY REMOVE WITHOUT DAMAGING ALUMINUM. REPLACE AND CHECK. MOTOR TEST RAN IN DRIVEWAY O.K. WILL FIELD TEST THIS WEEKEND.

Usually have what I need at a fair price.
by

Crowley has been outstanding. I've placed a few orders over the last few months and their prices are often the best, shipping is very reasonable, and very fast. A great seller.
by

Mercury 15

Repair Difficulty
Hard
Repair Time
1 to 2 hours
Saved my Merc! Thought my 30 year old Merc finally did it's last putt-putt. Found some of the parts here and there online as Mercury had most every part I needed, listed as discontinued. Came across Crowley marines site and they were able too fill my order 100% and they had better prices on the same parts I found elsewere. Thank You Crowley Marine!
by

Problem fixed: No control. Control cable came off of pulley. Rebuilt carb.

Local service centers wouldn't touch it. To old. Was going to buy a new outboard, then figured I would tear into it, since mama didn't want a new motor, she wanted a new boat! Found control cable was frayed and came off pulley on tiller handle. Need to remove recoil, carburetor and such to access the complete cable assembly. Replaced and adjusted ca

by

Mercury 25 hp 2 stroke

Repair Difficulty
Medium
Repair Time
2 to 4 hours
The parts diagrams are a great help, you also have all necessary parts that were needed.
by

Problem fixed: Hard to start, sputtering and spitting back out of the carb

Rebuilt carb and also installed new reed valves. Outboard is in storage for the winter, can't wait till spring to get it out and give it a try.

by

by

by

I was skeptical about receiving the correct part for my older outboard, but sure enough everything I ordered was the correct match. Shipping was fast and I had a trouble free repair! I'll definitely be ordering again from Crowley Marine!
by

easy order, quick delivery
by

Mercury 115

Great parts selection. Great prices and fast shipping.
by

Very good
by

Mariner 75Hp

My experience was very good, i will definetly purchase from the store again
by

86 Mercury 20hp

Good communication and follow through on promised timeline. Had parts that I was having difficulty sourcing. Very happy.
by

Mercury 60 Bigfoot

Repair Difficulty
Easy
Repair Time
Less than 30 mins
by

Problem fixed: Overheating

Got great help choosing the correct part via email.

by

Fast service. Shipping prices is a little high or would give 5 stars
by

There is no better resource for finding parts on an aging outboard. I'll continue to use Crowley for all of my future needs.
by

by

Very good service, package contained exactly what I ordered.
by

by

by

Excellent easy part referance material. Great order data kept me up to date on delivery time table and back orders. Thank you.
by

by

125 mercury

by

20 hp mercury

Repair Difficulty
Easy
Repair Time
30 to 60 mins
so far its been good waiting for carb value now
by

by

by

Mercury 115HP 2 Stroke

Repair Difficulty
Medium
Repair Time
1 to 2 hours
Good website, With good parts diagrams and part numbers. Competitive prices and fast shipping to Australia. Will buy from Crowley Marine again.
by

Problem fixed: Water in gear oil

Drained gear case, Pulled of prop, Removed gearbox, removed water pump housing & Pressure tested gear case to 10PSI and checked for leaks using soapy water and found gear shift seal and prop shaft seal leaking. Removed gear shaft coupling, replaced o-ring and oil seal, Re-installed gear shift coupling. Removed bearing carrier using removal tool, Changed inner and outer seals & outer O-ring, Re-installed bearing carrier lining up prop shaft & gears. Pressure tested gear box and gear box held 10PSI with no signs of leaks, Re-installed water pump housing, Installed lower unit, Installed Prop, Filled gear case with oil. Ran on muffs, tested for water pressure/temp and selected gears.

They had everything in stock on the shelf I wish it could shipped the very next day because everthing I ordered was there but it all good
by

Faster than anyone else could have done and that was with standard shipping.
by

by

Merccry 15hp

Excellent shopping experience, They had what I needed and shipped it very fast. I will order from them again for parts for my Mercury motors (15-150).^-
by

by

Top notch service and fast shipping. My go-to for outboard parts.
by

Have made several purchases from these guys,only once had problem getting parts. Used cheapest shipping method, after almost 14 days called Crowley Marine and they next day air me parts at no charge, just ask me to return lost parts should I receive them.Now I use 2nd day air. Great people to do business with!!
by

Have not got my parts yet Can not rate
by

Mercury 4 stroke 60hp

Repair Difficulty
Easy
Repair Time
1 to 2 hours
Very fast delivery to Australia, came quicker than parts I ordered a few days earlier from Melbourne
by

Problem fixed: High pressure fuel pump seized

Replaced with new pump

Right Part & Shipped Very Quickly! Tks
by

Items were in stock, shipped promptly, and arrive on or before estimated date.. Everything a consumer should expect but rarely experienced in today's retail environment.
by

by

by
Refresh

Customers Also purchased

Refresh

Aftermarket Product Interchange

Name SKU Price Brand
Thermostat 18-3549 - Sierra Marine
Thermostat 9-43014 $21.99 Mallory Marine
Mercury Thermostat 1991-97 120 Degree Oem#14586 ME-T86 - Red Rhino
Due to manufacturer policy OEM Mercury products can only be shipped to addresses within the United States.