Powerhead Gasket Set 

Key Features:

• Does not include head gaskets

Interchanges/Replaces

GLM

• 39330

Mercury Marine

• 27-55306A72
• 27-55306A73
• 27-55306A74
• 27-55306A75
• 27-78028A78

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-0105	GLM 31910 Mercury Marine 27-55306 27-78028 27-85489 27-85489-2 27-854891 27-856728	1	Baffle Plate to Block Gasket		N/A
18-0182	GLM 30610 Johnson/Evinrude Outboard 310058 Mallory 9-60002 Mercury Marine 27-62386 27-62386001 Mercury Race Outboard 27-62386001	1	Thermostat Gasket		N/A
18-0879	GLM 31400 Mallory 9-60042 Mercury Marine 27-37724 27-38501 27-385011	1	Adapter Plate Gasket		N/A
18-0914	GLM 30720 Mercury Marine 27-66847	1	Thermostat Cover Gasket		N/A
18-0938	GLM 31000 Mercury Marine 27-797971	1	Water Inlet Gasket		N/A
18-0940	GLM 32930 Mercury Marine 27-55308 27-78027 27-85488 27-854881 27-854882	1	Baffle Plate to Exhaust Gasket		N/A
18-0988	GLM 31640 Mallory 9-60058 Mercury Marine 27-37976 27-62860 27-628601	1	Powerhead Base Gasket		N/A
18-2802	GLM 31500 Mercury Marine 27-48164 27-481641	1	Carburetor Mounting Gasket		N/A
18-2805	GLM 31920 Mercury Marine 27-55307 27-74708 27-78029 27-85490 27-85490-2 27-854901 27-856729	1	Block Cover Gasket		N/A
18-2823	GLM 31060 Mallory 9-60039 Mercruiser Stern Drive 27-32769 Mercury Marine 27-19553 27-32769	1	Lower Water Pump Gasket		N/A
18-2824	GLM 31070 Mallory 9-60029 Mercury Marine 27-19551 27-32770	1	Upper Water Pump Gasket		N/A
18-2825	GLM 31080 Mallory 9-60030 Mercury Marine 27-32771	1	Water Pump Base Gasket		N/A
18-2838	GLM 31600 Mercury Marine 27-55279 27-552791	1	Transfer Port Cover Gasket		N/A
18-2841	GLM 31190 Mallory 9-60033 Mercury Marine 27-19552 27-77417	1	Water Pump Base Gasket		N/A
18-4261	GLM 31330 Mallory 9-78002 Mercury Marine 12-20262 19643 Mercury Race Outboard 12-20262	1	Washer		N/A
18-7115	GLM 82240 Johnson/Evinrude Outboard 302588 Mercruiser Stern Drive 25-20266 25-26722 Mercury Marine 25-20266 25-26722 OMC Stern Drive 302588	1	O-Ring		N/A
18-7143	GLM 81250 Johnson/Evinrude Outboard 331188 Mallory 9-76537 Mercruiser Stern Drive 25-65936 27-58025 391-5081 Mercury Marine 25-65936 OMC Stern Drive 322501 331188 Volvo Penta 3852169	2	O-Ring		N/A
18-7145	GLM 81080 Johnson/Evinrude Outboard 333572 Mallory 9-76500 Mercruiser Stern Drive 25-64068 Mercury Marine 25-64068 OMC Stern Drive 333572	3	O-Ring		N/A
18-7153	GLM 81180 Mallory 9-76505 Mercruiser Stern Drive 25-25439 Mercury Marine 25-25439 Mercury Race Outboard 25-25439 Mercury Race Sterndrive 25-25439 OMC Stern Drive 3852565 911851 Volvo Penta 3852565 997368	1	O-Ring		N/A
18-7155	Chrysler/Force/US Marine 25-26855 GLM 82230 Johnson/Evinrude Outboard 305270 Mallory 9-76541 Mercruiser Stern Drive 25-26855 Mercury Marine 25-26855 Yamaha Outboard 93210-41MJ2-00	1	O-Ring		N/A
18-7160	GLM 83340 Mallory 9-76545 Mercruiser Stern Drive 25-31986 Mercury Marine 25-31986	1	O-Ring		N/A
18-7167	Chrysler/Force/US Marine 785-97386 GLM 82390 Johnson/Evinrude Outboard 310414 Mallory 9-76549 Mercruiser Stern Drive 25-861844 785-97386 Mercury Marine 25-861844 785-97386 OMC Stern Drive 310414	1	O-Ring		N/A
18-7411	GLM 81240 Johnson/Evinrude Outboard 321921 Mercruiser Stern Drive 25-35480 25-8M2000816 Mercury Marine 25-35480 25-47386	1	O-Ring		N/A
18-7413	Chrysler/Force/US Marine 25-62702 25-F50342-1 F17510 F50342 GLM 80110 Johnson/Evinrude Outboard 303191 Mercruiser Stern Drive 25-62702 25-627021 Mercury Marine 25-22175 25-62702 Mercury Sport Jet 25-62702 OMC Stern Drive 303191	3	O-Ring		N/A
18-7414	GLM 80330 Mercury Marine 25-62384 25-64067 25-823683 Mercury Sport Jet 25-823683	1	O-Ring		N/A
18-7421	GLM 80070 Mercury Marine 25-16524 25-20415	1	O-Ring		N/A
18-7807	GLM 40320 Me cury Marine 55278A1	1	Fuel Pump Kit		N/A
NSS	Mercury Marine 25-62457	1	O-Ring	No Image	N/A
NSS	Mercury Marine 35-59072	1	Fuel Filter Screen	No Image	N/A
NSS	Mercury Marine 27-62396	1	Gasket	No Image	N/A
NSS	Mercury Marine 27-62716	1	Gasket	No Image	N/A