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Pro Piston Kit Std. Stbd

Johnson Evinrude 200/225 FFI FFI 3.685 Bore
Item#:
6000S
Cross Reference#:
439358
5000789
5006726
Manufacturer Item:
5000789
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
118.74
Each

Inlet Screen Screw

R/MR/Alpha I 1983-1990
Item#:
62679
Cross Reference#:
12822
18-3197
67373
76156
Manufacturer Item:
76156
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
2.39
Each

Pro Piston Kit Std. Port

Johnson Evinrude 200/225 FFI FFI 3.685 Bore
Item#:
6000P
Cross Reference#:
0439357
439357
5000788
5006725
Manufacturer Item:
5000788
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
118.74
Each

Fuel Pump, Electrical

Mercury75-300 DFI 1.5L 3.0L 2003 & Up /High Pressure pump
Mercury 
3 Cylinder
75hp 1.5L Optimax
80hp 1.5L Optimax
90hp 1.5L Optimax
115hp 1.5L Optimax
125hp 1.5L Optimax
115hp Pro XS 

6 Cylinder
200hp 3.0L Optimax
200hp 3.0L Pro XS
225hp 3.0L Optimax
225hp 3.0L Pro XS
250hp 3.0L Optimax
250hp 3.0L Pro XS
300hp 3.0L Optimax
300hp 3.0L Pro XS
Item#:
888725P
Cross Reference#:
888725T02
888725T1
Manufacturer Item:
888725T02
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
205.99
Each

Gasket, Drive Mounting Kit

MC 1 Rounded Top 1970-1982
Item#:
62614
Cross Reference#:
0769763
0775534
18-2614
18-2614
18-2820
31130
45821
64818
64818A1
64818A20
64818A4
64818BK4
64818Q4
64818T4
769763
775534
9-62602
Manufacturer Item:
64818A1
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
6.17
Each

Pro Piston Kit .030

Mercury Inline 3 4 6Cyl High Dome Bore 2.905
Item#:
9030
Cross Reference#:
14060
7453A3
7455A3
7576A2
7577A2
7578A2
7674A2
8898A2
8901A2
9137A14
Manufacturer Item:
8898A2
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
80.29
Each

Driveshaft Length 32 3/4"

Yamaha 91-95 650 VXR PWC Model
Item#:
61L455
Cross Reference#:
61L-45511-00-00
Manufacturer:
Pro Marine
Available:
In Stock
 
Heavy
Your Price:
208.03
Each

Fuel Filter, VST Fuel Pump

Yamaha 200-250Hp EFI 97-98 Mercury 225-250 EFI
Item#:
79901P
Cross Reference#:
18-79901
65L-13915-00-00
65L-13915-09-00
808504
808504T1
8085041
Manufacturer Item:
65L-13915-00-00
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
145.95
Each

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

Pro Marine 130°F Thermostat for Mercury & Mariner EFI, DFI & Pro XS

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:
In Stock
Your Price:
83.99
Each

Pro Piston Kit Std.

Mercury 50,60,75, 115 Inline High Dome Bore 2.875
Item#:
9000
Cross Reference#:
14020
3560A19
3560A2
3560A4
3560A6
4508A2
4879A2
4890A2
4891A2
4972A2
5035A2
5218A3
5219A2
5220A2
6388A3
6614A3
6661A4
6664A3
7433A3
7435A3
7657A3
7671A3
7672A3
8896A3
8896A3
9137A12
Manufacturer Item:
8896A3
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
100.00
Each

Pro Piston Kit .015

Mercury Inline 3 4 6Cyl High Dome Bore 2.890
Item#:
9015
Cross Reference#:
14040
18-4520
3778A1
3778A3
3778A4
4872A1
4881A1
4912A1
4982A1
5097A1
5303A2
5304A2
5306A2
6415A2
6695A2
6696A2
6697A2
7434A2
7436A2
7673A2
8897A2
8900A2
9137A13
Manufacturer Item:
8897A2
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
80.29
Each

Crankshaft New,EFI

Yamaha150-200 OX66 2.6L V6 Will not fit HPDI
Item#:
67HC
Cross Reference#:
67H-11411-00-00
67H-11411-01-00
67HCR
Manufacturer Item:
67H-11411-01-00
Manufacturer:
Pro Marine
Available:
In Stock
 
Heavy
Your Price:
1080.51
Each
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