Mercruiser Thermostat Kit V6 & V8

Thermostat kit Mercruiser V6 & V8

Thermostat kit to fit GM based MerCruiser V6 and V8 engines from 1983 onwards . The thermostat is designed for use in cooling systems with constant circulation and has an opening temperature of 140°F (60°C) . The kit includes all necessary gaskets for replacement.

The thermostat is an important part of the engine cooling system, as it regulates the engine's operating temperature . A faulty thermostat can cause overcooling or undercooling . In the worst case, the engine can boil, but running too cold is also not good, as it increases wear and fuel consumption .

Make sure the thermostat opens and closes at the correct temperature. You can test your current thermostat by heating it in water and checking to see if it opens at the correct temperature. If you are unsure about the thermostat's operation, it is a good idea to replace it .

Note: Not suitable for HI-Performance engines.

OEM: 807252T4
Previous OEM numbers: 807252Q4, 807252T1, 807252T7, 8072521, 8052731, 59137

Fits the following engines (according to serial number)

4.3L (262 CID V6)

• 185 (2 BBL.) > 1985–1987 > 0A331455 – 0B527954

• 205 (4 BBL.) > 1985–1987 > 0A331455 – 0B527954

• 175 (2 BBL.) > 1987 > 0B527955 – 0B773242

• 205 (4 BBL.) > 1987 > 0B527955 – 0B775129

• 4.3L (2 BBL.) > 1988–1992 > 0B773243 – 0D714106

• 4.3LX (4 BBL.) > 1988–1992 > 0B775130 – 0D714369

• 4.3L (Gen II) (2 BBL.) > 1992-1993 > 0D714107 – 0F000877

• 4.3LX (Gen II) (4 BBL.) > 1992-1993 > 0D714370 – 0F001219

• 4.3L (Gen II) (2 BBL.) > 1993-1995 > 0F000878 – 0F601126

• 4.3LX (Gen II) (4 BBL.) > 1993–1995 > 0F001220 – 0F601126

• 4.3L MPI ALPHA/BRAVO EC > 1A637496 & up

5.0L (305 CID V8)

• 228 (4 BBL.) > 1979–1982 > 5170009 – 6218461

• 228 MIE (4 BBL.) > 1979–1980 > 5170009 – 5907057

• 230 MIE (4 BBL.) > 1981–1986 > 5907058 – 0B522505

• 898 (2 BBL.) > 1983–1984 > 6218462 – 0B525981

• 200 (2 BBL.) > 1985–1986 > 6218462 – 0B525981

• 230 (4 BBL.) > 1985–1986 > 6218462 – 0B525981

• 200 (2 BBL.) > 1987 > 0B525982 – 0B774444

• 230 (4 BBL.) > 1987 > 0B525982 – 0B773739

• 5.0LX (4 BBL.) > 1988–1995 > 0B773740 – 0F600999

• 5.0L (2 BBL.) > 1988–1995 > 0B774445 – 0F600999

• 230 MIE (4 BBL.) > 1987–1995 > 0B522506 – 0B788151

• 5.0L MIE (4 BBL.) > 1987–1995 > 0B522506 – 0B788151

• 5.0L CARB ALPHA/BRAVO > 0W650000 & up

5.7L (350 CID V8)

• 260 (4 BBL.) > 1978–1982 > 4908850 – 6218461

• 260 MIE > 1981–1986 > 5907058 – 0B522505

• 260 (4 BBL.) > 1982–1986 > 6218462 – 0B525981

• 350 MAG. ALPHA (4 BBL.) > 1986–1987 > 0A635178 – 0B525981

• 5.7L Competition Ski > 1987–1995 > 0B514627 – 0F775199

• 260 (4 BBL.) > 1987 > 0B525982 – 0B773739

• 5.7L GM > 1988–1995 > 0B525982 – 0F600999

• 350 MAG. ALPHA (4 BBL.) > 1987–1995 > 0B525982 – 0F600999

• 5.7L MIE > 1988–1993 > 0B788197 – 0F024999

• 5.7L MIE > 1994–1995 > 0F025000 – 0F622099

• 5.7L MIE > 1994–1995 > 0F622151 – 0F746099

• 350 MAG. (SKI) > 1991–1996 > 0D505450 – 0K040399

• 5.7L CARB ALPHA/BRAVO > 0W650000 & up

6.2L (377 CID V8)

• Scorpion 377 Sterndrive > 0L416146 – 0M907201

6.3L–6.4L (383/385 CID V8)

• 383 Stroker Scorpion > 1G300000 & up

• 383 Mag Inboard 4V > 1G400000 – 1G499999

• 385 Performance Tuned > 1G400000 – 1G499999

• 383 Stroker Scorpion Bravo > all

• 383 Mag Bravo 4V > 1G480748 – 1G499999

7.4L (454 CID V8)

• 330 GM 454 > 1982–1987 > 6083145 – 0B816540

• 340 MIE W/B/W > 1981–1987 > 5889914 – 0B788365

• 370 TRS > 1978–1985 > 4179554 – 6721527

• 400 TRS > 1980–1986 > 4179554 – 0B457644

• 440 TRS > 1983–1986 > 4179554 – 0B485220

• 420 GM 454 > 1987–1989 > 0A398941 – 0B622418

• 454 MAG. ALPHA > 1986–1988 > 0A631894 – 0B785148

• 454 MAG. BRAVO > 1988–1992 > 0B721206 – 0D805068

• 7.4L BRAVO > 1988–1991 > 0B771113 – 0D603117

• 7.4L MIE W/HURTH > 1989–1992 > 0C391564 – 0D715493

• 425 GM 454 > 1990–1992 > 0A398941 – 0D937011

• 425 (Gen V) > 1992–1993 > 0A398941 – 0D937011

• 7.4L BRAVO (Gen V) > 1992–1996 > 0D603118 – 0F800699

• 454 MAG. BRAVO (Gen V) > 1992–1994 > 0D805069 – 0F304999

• 7.4L MIE (LH) Gen V > 1992–1996 > 0D715494 – 0F820141

• 450 (Gen V) > 1995–1996 > 0F347100 – 0F347277

• 525 SC (Gen V) > 1996 > 0F615814 – 0F745215

7.9L (482 CID V8)

• 460 TRS GM 482 > 1983–1986 > 4179554 – 6181046

8.2L (502 CID V8)

• 8.2L MIE W/HURTH > 1990–1992 > 0C878221 – 0D857199

• 502 MAG. BRAVO (Gen V) > 1992–1993 > 0D824589 – 0F114528

• 8.2L MIE Gen V > 1993–1996 > 0D857200 – 0F819619

• 500 (Gen V) > 1996 > 0F615767 – 0F745159

• R1 525 SC Gen VI > 0F745260 – 0F877734

• 500 (Gen VI) > 1997–1998 > 0F745195 – 0F877722

• R1 500 (Gen VI) > 1997–1998 > 0K000001 – 0L000737

• R1 500 (Gen VI) > 1997–1998 > 0L000768 – 0L001772

• 525 SC Gen VI > 0K000012 – 0L415623

• 500 (Gen +) > 1999 > 0L414639 – 0L601036

8.9L (540 CID V8)

• 500 Bulldog > 1990–1996 > 0C577254 – 0F745405

• 500 Bulldog > 1999–2001 > 0L414620 – 0M050281

EFI series

• 500 EFI > 0L001496 – 0L306499

• 500 EFI > 0L306500 – 0L307027

• 500 EFI > 0L307028 – 0L602036

• 500 EFI > 0M050001 – 0M050853

• 500 EFI > 0M052001 – 0M053628

• 500 EFI > 0M900064 – 0M901284

• 500 EFI > 0M905089 – 0M907127