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Side Mount Controls

Merc 14 Pin, T&T, Gen 1 Cable 15 Foot Harness STBD Side
This item has been discontinued and replaced by item 
Item#:
4-881170A13
Cross Reference#:
8M0178536
881170A13
Manufacturer Item:
881170A13
Manufacturer:
Pro Marine
Available:
Out of Stock
Your Price:
253.83
Each
This item is discontinued

Side Mount Controls Gen 1 Cable

Mercury 8 Pin Trim & Tilt 15 Foot Harness 8 Pin
This item has been discontinued and replaced by item 
Item#:
4-881170A15
Cross Reference#:
16900A15
8M0178521
881170A1
881170A15
Manufacturer Item:
881170A15
Manufacturer:
Pro Marine
Available:
Out of Stock
Your Price:
245.14
Each
This item is discontinued

Fuel Pump Feed

Mercury/Tohatsu 25-30hp 4strok Honda
This item has been discontinued and replaced by item 
Item#:
1-32-898101T67
Cross Reference#:
HZY316735004
16735-ZY3-004
3AC-10150-M
3AC-10150-0
3AC101500
3AC101500M
898101T67
898101T67
Manufacturer Item:
898101T67
Manufacturer:
Pro Marine
Available:
Out of Stock
Your Price:
192.64
Each
This item is discontinued

Bearing, Lower Driveshaft

Mercury 200-300hp 3.0L Double Bearing
Item#:
8939-2
Cross Reference#:
18-1144
21585
48939
48939
48939A2
8M0146553
Manufacturer Item:
8M0146553
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
28.57
Each

Binnacle/Top Mount Control

Mercury 14 pin (Aftermarket) Gen 2 Style Control Cable
This item has been discontinued and replaced by item 
Item#:
4-8M0059686
Cross Reference#:
8M0059686
883711A12
Manufacturer Item:
8M0059686
Manufacturer:
Pro Marine
Available:
Out of Stock
Your Price:
278.10
Each
This item is discontinued

Twin/Dual Engine Control

Mercury Uses Gen 2 Cables
This item has been discontinued and replaced by item 
Item#:
4-8M0075245
Cross Reference#:
8M0075245
883711A02
Manufacturer Item:
8M0075245
Manufacturer:
Pro Marine
Available:
Out of Stock
Your Price:
468.12
Each
This item is discontinued

Gasket, Cylinder Head

Mercury 65-115HP EFI 4-Stroke
This item has been discontinued and replaced by item 
Item#:
6770
Manufacturer Item:
8M0090776
Manufacturer:
Pro Marine
Available:
Out of Stock
Your Price:
39.13
Each
This item is discontinued

Filter, Oil

Mercury 350-400HP 5.7L Verado
This item has been discontinued and replaced by item 
Item#:
4850
Manufacturer Item:
8M0205848
Manufacturer:
Pro Marine
Available:
Out of Stock
Your Price:
14.57
Each
This item is discontinued

Sensor Pressure

Fits Mercury 2.5L Mercruiser 4.3L 5.0L 5.7L 8.1L
This item has been discontinued and replaced by item 
Item#:
1-97-8M6000623
Cross Reference#:
8M0157742
8M0210760
8M6000623
859596
881879A7
881879010
8818793
Manufacturer Item:
8M6000623
Manufacturer:
Pro Marine
Available:
Out of Stock
Your Price:
121.87
Each
This item is discontinued

Mercury Mariner 175HP-300HP V6 Thermostat 130° 9004

Pro Marine 130°F Thermostat for Mercury & Mariner EFI, DFI & Pro XS
This item has been discontinued and replaced by item 

Pro Marine 130°F V6 Outboard Thermostat

Mercury & Mariner 2.5L / 3.0L EFI & DFI Thermostat

The Pro Marine 9004 thermostat is a replacement 130°F marine thermostat for select Mercury and Mariner 175HP-300HP EFI, DFI, OptiMax, Pro Max, and Pro XS outboards.

Designed for high-performance Mercury V6 applications, this thermostat helps maintain proper engine operating temperature for cooling system efficiency, engine protection, and dependable outboard performance.

Compatible Applications

Horsepower Range Engine Family Engine Type Application Notes
175HP-200HP Mercury V6 2.5L EFI Select EFI cooling system applications
175HP-200HP Mercury V6 2.5L DFI / OptiMax Select OptiMax thermostat applications
200HP-300HP Mercury V6 3.0L EFI Select EFI cooling systems
200HP-300HP Mercury V6 3.0L DFI / OptiMax Select DFI and OptiMax applications
175HP-300HP Mercury Pro Max High Performance V6 Select Pro Max cooling systems
175HP-300HP Mercury Pro XS High Performance V6 Select Pro XS applications
175HP-300HP Mariner V6 Outboards EFI & DFI Equivalent Mercury platform applications
Looking for the Alternate Pro Marine Version?

We also stock Pro Marine thermostat part number 9004P for the same Mercury and Mariner applications.

View Pro Marine Thermostat 9004P

OEM Part Numbers & Cross References

Type Part Number
Current Mercury OEM Number 8M0057307
Mercury Cross Reference 885599
Mercury Cross Reference 885599002
Mercury Cross Reference 885599003
Mercury Cross Reference 885599004
Mercury Cross Reference 885599005
Mercury Cross Reference 8855991
Pro Marine Part Number 9004

What This Thermostat is Used For

This thermostat regulates cooling system water flow to help maintain proper engine operating temperature inside compatible Mercury and Mariner V6 outboards.

Proper thermostat operation is important for fuel efficiency, combustion quality, cooling system performance, and long-term engine durability.

A sticking or failed thermostat can contribute to overheating, inconsistent engine temperature, poor idle quality, or improper cooling system operation.

Thermostats are commonly replaced during cooling system maintenance, water pump service, or overheating diagnosis on high-performance Mercury outboards.

Key Features and Benefits

  • Pro Marine replacement 130°F marine thermostat
  • Fits select Mercury and Mariner 175HP-300HP V6 outboards
  • Compatible with EFI, DFI, OptiMax, Pro Max, and Pro XS applications
  • Replaces Mercury OEM 8M0057307 and 885599 series
  • Supports proper engine operating temperature
  • Helps maintain cooling system efficiency
  • Designed for high-performance marine applications
  • Excellent replacement for worn or sticking thermostats

Thermostat Details

  • Brand: Pro Marine
  • Part Number: 9004
  • Temperature Rating: 130°F
  • OEM Reference: 8M0057307
  • Cross References: 885599, 885599002, 885599003, 885599004, 885599005, 8855991
  • Applications: Mercury & Mariner 175HP-300HP V6 Outboards
  • Engine Families: 2.5L & 3.0L V6
  • Compatible Systems: EFI, DFI, OptiMax, Pro Max, Pro XS
  • System: Cooling System
  • Use: Engine temperature regulation

FAQ

What engines does this thermostat fit?
This thermostat fits select Mercury and Mariner 175HP-300HP EFI, DFI, OptiMax, Pro Max, and Pro XS V6 outboards using the listed OEM references.

What temperature is this thermostat?
This is a 130°F marine thermostat.

What OEM numbers does this replace?
This thermostat replaces Mercury OEM number 8M0057307 along with the 885599 series thermostat numbers.

When should a thermostat be replaced?
Thermostats are commonly replaced during cooling system maintenance, overheating diagnosis, or water pump service.

Do you offer another version of this thermostat?
Yes. We also stock alternate Pro Marine thermostat part number 9004P for compatible applications.

Dealer Discounts & Store Policies

Dealer / Marine Industry Discounts

Are you a marine dealer, technician, boat builder, or industry professional? We offer dealer pricing for qualified marine businesses.

Apply for a Dealer Account

Shipping Policy

  • Free shipping on orders over $100 continental U.S.
  • Orders ship via UPS, USPS, and FedEx.
  • Orders received before 5:30 PM EST ship the same business day.
  • Typical delivery time is 1–5 business days.

30-Day Return Policy

  • Returns accepted within 30 days of delivery.
  • Cooling system parts should be installed only after proper diagnosis and inspection.
  • Items must be new, unused, and in original packaging.
  • Return authorization is required before sending items back.

Need help with a return or order question?
Contact Us
Phone: 941-721-3000

Searchable Terms

9004, 8M0057307, 885599, 885599002, 885599003, 885599004, 885599005, 8855991, Mercury thermostat, Mercury 130 thermostat, Mercury OptiMax thermostat, Mercury Pro XS thermostat, Mercury Pro Max thermostat, Mercury 2.5L thermostat, Mercury 3.0L thermostat, Mercury V6 thermostat, Mariner thermostat, 130 degree marine thermostat, Pro Marine thermostat

Item#:
9004
Cross Reference#:
13610
8M0057307
885599
885599002
885599003
885599004
885599005
8855991
Manufacturer Item:
8M0057307
Manufacturer:
Pro Marine
Available:
Out of Stock
Your Price:
83.99
Each
This item is discontinued

Housing Billet, Thermostat

Mercury 2.0L 2.4L 2.5L V6 Polished Aluminum
This item has been discontinued and replaced by item 
Item#:
9039
Cross Reference#:
68694
90390
90390A1
Manufacturer Item:
90390A1
Manufacturer:
Pro Marine
Available:
Out of Stock
Your Price:
39.95
Each
This item is discontinued

Safety Switch 3 Wire

Seadoo 720-1503 DESS Post
This item has been discontinued and replaced by item 
Item#:
3-91-8001734
Cross Reference#:
278000646
278000955
278001589
278001734
278002325
278002773
Manufacturer Item:
278001734
Manufacturer:
Pro Marine
Available:
Out of Stock
Your Price:
53.56
Each
This item is discontinued
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