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Prop Shaft

Yamaha V6 2 Stroke 150-225 HP 1987-2000
Item#:
69456
Cross Reference#:
6J9-45611-00-00
6J9-45611-01-00
Manufacturer Item:
6J9-45611-01-00
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
256.21
Each

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

Pro Marine 130°F V6 Outboard Thermostat

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

The Pro Marine 9004P 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 reliable 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 an Alternate Version?

We also stock another Pro Marine replacement thermostat for compatible Mercury and Mariner applications.

View Alternate Pro Marine 130°F Thermostat

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 9004P

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 critical 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: 9004P
  • 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 9004 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

9004P, 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#:
9004P
Cross Reference#:
18-3535
8M0057307
885599
885599002
885599003
885599004
885599005
8855991
Manufacturer Item:
8M0057307
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
55.61
Each

Carburetor Kit, Mercarb

Fits Mercruiser 3.0L 4.3L 5.0L 5.7L w/Bent Accel Pump Shaft
Item#:
50844
Cross Reference#:
18-7098
18-7098-1
76086
804844
804844001
804844002
810929
810929003
810929004
8109291
8109292
9043
9061
90611
9655
96551
Manufacturer Item:
804844002
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
47.33
Each

Carburetor Kit, Mercarb

Mercruiser 4.3L V6 w/Straigh Accel Shaft1985-1995
Item#:
50845
Cross Reference#:
18-7097
804845
9046
9437
Manufacturer Item:
804845
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
64.02
Each

ProHP Piston Kit .030 Port

Johnson Evinrude 200-250 V6 Big Bore Finger Ported
Item#:
4330PH
Cross Reference#:
0436252
0436862
0439515
0778449
5006711
778449
Manufacturer Item:
436862
Manufacturer:
Pro Marine
Available:
Out of Stock
Your Price:
148.65
Each

Piston Kit, Air Compressor

Mercury STD
Item#:
9200
Manufacturer:
Pro Marine
Available:
In Stock
39.2000
Your Price:
37.00
Each

Engine Coupler Assy.

Mercruiser V6 V8 w/Alpha 1993 & Up
Item#:
98643P
Cross Reference#:
18643A5
Manufacturer Item:
18643A5
Manufacturer:
Pro Marine
Available:
Out of Stock
Your Price:
230.66
Each

ProHP Piston Kit .030 Stbd

Johnson Evinrude 200-250 V6 Big Bore Finger Ported
Item#:
4330SH
Manufacturer Item:
436861
Manufacturer:
Pro Marine
Available:
Out of Stock
Your Price:
148.65
Each

Drive Shaft

Suzuki DF200-250 S T Z 04-10 & Up
Item#:
57100-93J21P
Cross Reference#:
57110-93J20
57110-93J21
Manufacturer Item:
57110-93J21
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
369.76
Each

Sensor, O2 Sensor

Indmar 5.7L H.O. 5.7L 340 Assault 2007-Up
Item#:
56162
Cross Reference#:
556162
Manufacturer Item:
556162
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
68.65
Each

Pro Piston Kit .040 Port

Yamaha V6 3.3L Carb 1990-94 Bore 3.584 Dome Top Piston
Item#:
6940P
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
95.47
Each

Pro Piston Kit .040 Stbd

Yamaha V6 3.3L Carb 1990-94 Bore 3.584 Dome Top Piston
Item#:
6940S
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
95.47
Each
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