Powerhead Gasket Set 

Key Features:

• Does not include head gasket

Interchanges/Replaces

GLM

• 39337

Mallory

• 9-64214

Mercury Marine

• 27-85491A87
• 27-85491A90

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-0103	GLM 30990 Mercury Marine 27-37725 27-72496 27-79650 27-796501	1	Powerhead Base Gasket		N/A
18-0137	GLM 31790 Mercury Marine 27-46111 27-72488 27-85492 27-85492-2 27-854921 27-854924	1	Baffle Plate Gasket		N/A
18-0539	GLM 85630 Mercury Marine 37721 37721001	1	Exhaust Leg Rubber Seal		N/A
18-0870	GLM 30060 Mallory 9-60063 Mercury Marine 27-27936 27-279361	2	Transfer Port Cover Gasket		N/A
18-0879	GLM 31400 Mallory 9-60042 Mercury Marine 27-37724 27-38501 27-385011	1	Adapter Plate Gasket		N/A
18-0938	GLM 31000 Mercury Marine 27-797971	1	Water Inlet Gasket		N/A
18-2800	GLM 31860 Mercury Marine 27-26891 27-64659 27-75791 27-757911	2	Carburetor Mounting Gasket		N/A
18-2810	GLM 30260 Mercury Marine 27-43777 27-437771 27-437772 27-96483	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
18-2825	GLM 31080 Mallory 9-60030 Mercury Marine 27-32771	1	Water Pump Base Gasket		N/A
18-7151	GLM 82340 Mallory 9-76540 Mercruiser Stern Drive 25-20081 25-39572 Mercury Marine 25-20081 25-39572	2	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
18-7161	GLM 80420 Mallory 9-76546 Mercruiser Stern Drive 25-32546 Mercury Marine 25-32546	2	O-Ring		N/A
18-2824	GLM 31070 Mallory 9-60029 Mercury Marine 27-19551 27-32770	1	Upper Water Pump Gasket		N/A
18-2945	Chrysler/Force/US Marine 12-19183 F50556 F8077 F8186 Johnson/Evinrude Outboard 307552 Mallory 9-60101 9-60102 Mercruiser Stern Drive 12-19183 12-191832 12-191833 12-19183B 12-20260 12-20260B Mercury Marine 12-19183 12-191832 12-191833 12-20260	1	Drain Screw Gasket		N/A
18-7166	GLM 80160 Mercury Marine 25-45254	1	O-Ring		N/A
18-0942	GLM 31780 Mercury Marine 27-46110 27-72486 27-85491 27-85491-2 27-854911 27-854913	1	Baffle Plate Gasket		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
18-7817	Chrysler/Force/US Marine 21-42990A10 21-42990A7 21-42990A8 GLM 40290 Mercury Marine 21-42990A1 21-42990A10 21-42990A11 21-42990A2 21-42990A3 21-42990A4 21-42990A5 21-42990A6 21-42990A7 21-42990A8 21-42990A9 21-857005A1 Mercury Sport Jet 21-42990A11 21-857005A1	1	Fuel Pump Kit		N/A
NSS	Mercury Marine 26-38452	2	Seal, Rubber	No Image	N/A