Powerhead Gasket - Mercury

Key Features:

• Does not Include Head Gaskets

Interchanges/Replaces

GLM

• 39520

Mallory

• 9-64204

Mercury Marine

• 27-815791A90
• 27-815791A92
• 27-815809A90
• 27-815810A90

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-0135	GLM 32880 Mercury Marine 27-78246 27-782461	2	Adapter Cover 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	2	Thermostat Gasket		N/A
18-0384	GLM 32350 Mercury Marine 27-817533 27-89221 27-892211 27-8M0027781	3	Carburetor Gasket		N/A
18-0641	GLM 37590 Mercury Marine 27-828292 Mercury Sport Jet 27-828292	3	Carburetor Mounting Gasket		N/A
18-0642	GLM 37560 Mallory 9-60051 Mercury Marine 27-19050 27-190502 27-190503 27-190505	1	Divider Plate Gasket		N/A
18-0643	GLM 37570 Mercury Marine 27-183071 27-183076	1	Powerhead Base Gasket		N/A
18-0644	GLM 37530 Mercury Marine 27-146972 Mercury Sport Jet 27-146972	1	Reed Plate Gasket		N/A
18-0645	GLM 37540 Mallory 9-60056 Mercury Marine 27-167371 Mercury Sport Jet 27-167371	1	Adapter Plate Gasket		N/A
18-0646	GLM 37550 Mercury Marine 27-813859 27-883775 Mercury Sport Jet 27-813859 27-881034	1	Reed Plate Gasket		N/A
18-0838	Yamaha Outboard 93210-37M25-00	1	O-Ring		N/A
18-0858	GLM 81430 Mallory 9-76516 Mercruiser Stern Drive 25-54029 Mercury Marine 25-54029 Mercury Sport Jet 25-54029	1	O-Ring		N/A
18-0860	GLM 81520 Mercruiser Stern Drive 25-62700 Mercury Marine 25-62700 Mercury Sport Jet 25-62700	1	O-Ring		N/A
18-0936	GLM 31990 Mallory 9-60057 Mercury Marine 27-67624 27-78690 27-78690002 Mercury Sport Jet 27-78690 27-78690002	2	Relief Valve Plate Gasket		N/A
18-2509	GLM 31690 Mercury Marine 27-67751	3	Carburetor Mounting Gasket		N/A
18-2511	GLM 32510 Mercury Marine 27-67074 27-88727 27-99173 27-99173 2 27-991731 27-991734	1	Drive Shaft Housing to Exhaust Plate Gasket		N/A
18-2513	GLM 30890 Mallory 9-60049 9-60050 Mercury Marine 27-11338 27-67208 Mercury Sport Jet 27-11338	2	Crankcase Gasket (Cyl. Block Sealing V-6)		N/A
18-2914	GLM 31010 Mallory 9-60034 Mercruiser Stern Drive 27-32433 27-856081 27-8M0090319 Mercury Marine 27-30603 27-32433 27-85608 27-856081 27-8M0090319	1	Water Pump Gasket		N/A
18-2915	GLM 31020 Mallory 9-60035 Mercruiser Stern Drive 27-32434 27-856091 27-858524 Mercury Marine 27-30604 27-32434 27-85609 27-856091 27-858524	1	Water Pump Gasket		N/A
18-2919	GLM 31050 Mallory 9-60031 Mercruiser Stern Drive 27-426311 Mercury Marine 27-42631 27-426311	1	Water Pump Gasket		N/A
18-3110	GLM 12830 Mallory 9-43604 Mercruiser Stern Drive 26-38970 Mercury Marine 26-29677 26-36557A1 26-38970	2	Water Pump Housing Bushing		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
18-7157	GLM 83410 Mallory 9-76542 Mercruiser Stern Drive 25-29976 Mercury Marine 25-29976	1	O-Ring		N/A
18-7159	GLM 83440 Mallory 9-76544 Mercruiser Stern Drive 25-31534 25-48451 Mercury Marine 25-31534	1	O-Ring		N/A
18-7174	Chrysler/Force/US Marine 25-45711 25-F455342 GLM 81140 Johnson/Evinrude Outboard 326649 553127 Mallory 9-76553 Mercruiser Stern Drive 25-45711 Mercury Marine 25-45711 Mercury Sport Jet 25-45711 OMC Stern Drive 326649 553127 910582	1	O-Ring		N/A
18-7176	Chrysler/Force/US Marine 25-90011 25-F74305 F694555 F74035 F74305-1 GLM 81390 Mallory 9-76554 Mercruiser Stern Drive 25-896523 25-90011 Mercury Marine 25-896523 25-90011	1	O-Ring		N/A
18-8305	Mercury Marine 26-814754 42838 69668 88726 Mercury Race Outboard 428381 69668 Mercury Sport Jet 26-814754	1	Divider Plate Seal		N/A
18-2506-1	Mallory 9-60046 Mercury Marine 27-99176 27-991762 27-991763 27-991764 Mercury Race Outboard 27-99176	1	Exhaust Plate Gasket		N/A
18-0970	Chrysler/Force/US Marine 27-987691 GLM 32960 Mallory 9-60054 Mercury Marine 27-98769 27-987691 Mercury Sport Jet 27-987691	1	Fuel Pump Base Gasket		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

Interchanges/Replaces

GLM

• 31640

Mallory

• 9-60058

Mercury Marine

• 27-37976
• 27-62860
• 27-628601

Interchanges/Replaces

GLM

• 31980

Mallory

• 9-60059

Mercury Marine

• 27-76589
• 27-78623
• 27-88451
• 27-884511

Interchanges/Replaces

GLM

• 39250

Mallory

• 9-64201
• 9-64212

Mercury Marine

• 27-11338A85
• 27-11338A88
• 27-89221A32
• 27-89221A84
• 27-89221A85
• 27-89221A88

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-0129	GLM 30670 Mallory 9-60062 Mercury Marine 27-65744 27-657441 27-657442 27-657443	6	Reed Block Gasket		N/A
18-0135	GLM 32880 Mercury Marine 27-78246 27-782461	1	Adapter Cover 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	2	Thermostat Gasket		N/A
18-0359	GLM 30740 Mercury Marine 27-67275 27-672751	1	Induction Silencer Cover Gasket		N/A
18-0384	GLM 32350 Mercury Marine 27-817533 27-89221 27-892211 27-8M0027781	3	Carburetor Gasket		N/A
18-0858	GLM 81430 Mallory 9-76516 Mercruiser Stern Drive 25-54029 Mercury Marine 25-54029 Mercury Sport Jet 25-54029	1	O-Ring		N/A
18-0860	GLM 81520 Mercruiser Stern Drive 25-62700 Mercury Marine 25-62700 Mercury Sport Jet 25-62700	1	O-Ring		N/A
18-0936	GLM 31990 Mallory 9-60057 Mercury Marine 27-67624 27-78690 27-78690002 Mercury Sport Jet 27-78690 27-78690002	2	Relief Valve Plate Gasket		N/A
18-0952	GLM 32330 Mercruiser Stern Drive 27-88907003 Mercury Marine 27-88907 27-88907003 Mercury Sport Jet 27-88907	2	Relief Valve Plate Gasket		N/A
18-2501	GLM 31680 Mallory 9-60060 Mercury Marine 27-67738 27-93536 27-935361	1	Reed Block Housing Gasket		N/A
18-2502	GLM 32150 Mercury Marine 27-87396 27-90484 27-904841 Mercury Race Outboard 27-90484 27-904841	2	Divider Plate Gasket		N/A
18-2503	GLM 32530 Mercury Marine 27-78068 27-99177 27-991771 27-991772	1	Drive Shaft Housing to Exhaust Plate Gasket		N/A
18-2509	GLM 31690 Mercury Marine 27-67751	3	Carburetor Mounting Gasket		N/A
18-2510	GLM 32450 Mercury Marine 27-96761 27-967611	1	Reed Block Housing Gasket		N/A
18-2511	GLM 32510 Mercury Marine 27-67074 27-88727 27-99173 27-99173 2 27-991731 27-991734	1	Drive Shaft Housing to Exhaust Plate Gasket		N/A
18-2513	GLM 30890 Mallory 9-60049 9-60050 Mercury Marine 27-11338 27-67208 Mercury Sport Jet 27-11338	2	Crankcase Gasket (Cyl. Block Sealing V-6)		N/A
18-2803	GLM 32120 Mercury Marine 27-90430 27-904301	3	Carburetor Mounting Gasket		N/A
18-2808	GLM 32440 Mercury Marine 27-96278 Mercury Race Outboard 27-96278	2	Cylinder Cover Gasket		N/A
18-2826	GLM 31040 Mallory 9-60036 Mercruiser Stern Drive 27-33146 27-856704 Mercury Marine 27-33146 27-85610 27-856101	1	Water Pump Base Gasket		N/A
18-2914	GLM 31010 Mallory 9-60034 Mercruiser Stern Drive 27-32433 27-856081 27-8M0090319 Mercury Marine 27-30603 27-32433 27-85608 27-856081 27-8M0090319	1	Water Pump Gasket		N/A
18-2915	GLM 31020 Mallory 9-60035 Mercruiser Stern Drive 27-32434 27-856091 27-858524 Mercury Marine 27-30604 27-32434 27-85609 27-856091 27-858524	1	Water Pump Gasket		N/A
18-2919	GLM 31050 Mallory 9-60031 Mercruiser Stern Drive 27-426311 Mercury Marine 27-42631 27-426311	1	Water Pump Gasket		N/A
18-3110	GLM 12830 Mallory 9-43604 Mercruiser Stern Drive 26-38970 Mercury Marine 26-29677 26-36557A1 26-38970	2	Water Pump Housing Bushing		N/A
18-3862	GLM 35860 Mallory 9-63853 Mercury Marine 27-41246 27-41246-1 27-412462 27-41247 27-41247T01 27-96543	2	Head Gasket		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
18-7157	GLM 83410 Mallory 9-76542 Mercruiser Stern Drive 25-29976 Mercury Marine 25-29976	1	O-Ring		N/A
18-7159	GLM 83440 Mallory 9-76544 Mercr iser Stern Drive 25-31534 25-48451 Mercury Marine 25-31534	1	O-Ring		N/A
18-7162	Chrysler/Force/US Marine 25-33145 GLM 82260 Johnson/Evinrude Outboard 302337 Mallory 9-76547 Mercruiser Stern Drive 25-32424 25-33145 Mercury Marine 25-33145 Mercury Sport Jet 25-33145 OMC Stern Drive 302337 302377 3852044 Sears 25-33145 Volvo Penta 3852044	1	O-Ring		N/A
18-7164	GLM 81260 Johnson/Evinrude Outboard 302537 Mercruiser Stern Drive 25-33466 25-67675 25-846356 27-898101789 Mercury Marine 25-33466 25-67675 25-846356	1	O-Ring		N/A
18-7168	GLM 80120 Johnson/Evinrude Outboard 202893 Mallory 9-76550 Mercruiser Stern Drive 25-21720 25-26834 25-48171 25-801334436 Mercury Marine 25-20587 25-21720 25-26834 25-48171 25-801334436 OMC Stern Drive 202893 3852033 Volvo Penta 3852033	4	O-Ring		N/A
18-7174	Chrysler/Force/US Marine 25-45711 25-F455342 GLM 81140 Johnson/Evinrude Outboard 326649 553127 Mallory 9-76553 Mercruiser Stern Drive 25-45711 Mercury Marine 25-45711 Mercury Sport Jet 25-45711 OMC Stern Drive 326649 553127 910582	2	O-Ring		N/A
18-7176	Chrysler/Force/US Marine 25-90011 25-F74305 F694555 F74035 F74305-1 GLM 81390 Mallory 9-76554 Mercruiser Stern Drive 25-896523 25-90011 Mercury Marine 25-896523 25-90011	1	O-Ring		N/A
18-7406	GLM 80100 OMC Stern Drive 3852523 911311 Volvo Penta 3852523	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
18-7421	GLM 80070 Mercury Marine 25-16524 25-20415	2	O-Ring		N/A
18-7812	GLM 40360 Mallory 9-37751 Mercury Marine 66599A2 89031A2	1	Fuel Pump Kit		N/A
18-2506-1	Mallory 9-60046 Mercury Marine 27-99176 27-991762 27-991763 27-991764 Mercury Race Outboard 27-99176	1	Exhaust Plate Gasket		N/A
18-2508-1	GLM 32540 Mercury Marine 27-96440 27-99776 27-997761	2	Exhaust Plate Gasket		N/A
9-76560	Mercury Marine 25-38099	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 27-672741	1	Gasket, Choke Plate to Carburetor	No Image	N/A

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