Additional Details:

• Temperature Rating: 160°
• For: Fresh Water Cooling
• Fits: 1987 & newer GM engines with standard cooling requiring a 160° thermostat

Use With:

• 18-2917: Thermostat Gasket
• 18-3644: Thermostat Kit
• 18-3647: Thermostat Kit
• 18-3647D: Thermostat Kit (Display Pack)
• 18-3648: Thermostat Kit
• 18-3648D: Thermostat Kit (Display Pack)

Interchanges/Replaces

Crusader

• 97895

GLM

• 13100

Mallory

• 9-43002

Mercruiser Stern Drive

• 8052732
• 8072522
• 807252T2
• 8M0091470
• 8M0109441

Additional Details:

• Temperature Rating: 160°F

Interchanges/Replaces

Mallory

• 9-43100

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-3649	Crusader 97895 GLM 13100 Mallory 9-43002 Mercruiser Stern Drive 8052732 8072522 807252T2 8M0091470 8M0109441	1	Thermostat		N/A
18-2553	GLM 31460 Mallory 9-60005 Mercruiser Stern Drive 27-47510 27-47510Q Osco 47510	1	Thermostat Cover Gasket		N/A
18-2917	GLM 31560 GM 3701777 Mallory 9-60007 9-60007-10 Mercruiser Stern Drive 27-33179 27-53045 27-530451 27-53045B1 F10077105 FI1101276 FI1101291 FI5000096 OMC Inboard 3701777 OMC Stern Drive 3701777	1	Thermostat Gasket		N/A

Additional Details:

• Temperature Rating: 142°F
• Fits: 1983 & newer GM V-6 & V-8 engines with standard cooling

Interchanges/Replaces

GLM

• 13390

Mallory

• 9-43150

Mercruiser Stern Drive

• 807252Q4
• 807252T4
• 807252T7

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-2552	GLM 31670 Mallory 9-60008 Mercruiser Stern Drive 27-331791 27-331792 27-33179B2	1	Thermostat Cover Gasket		N/A
18-2553	GLM 31460 Mallory 9-60005 Mercruiser Stern Drive 27-47510 27-47510Q Osco 47510	1	Thermostat Cover Gasket		N/A
18-2554	GLM 31630 Mallory 9-60006 Mercruiser Stern Drive 27-41812 27-41812B 27-41812Q 27-90556 Osco 41812	1	Thermostat Cover Gasket		N/A
18-2917	GLM 31560 GM 3701777 Mallory 9-60007 9-60007-10 Mercruiser Stern Drive 27-33179 27-53045 27-530451 27-53045B1 F10077105 FI1101276 FI1101291 FI5000096 OMC Inboard 3701777 OMC Stern Drive 3701777	1	Thermostat Gasket		N/A
18-3551	Chrysler Inboard 4142885 Crusader 96319 GLM 13030 Mallory 9-43013 Mercruiser Stern Drive 32728 35884 59137 59137A1 67464 8052731 8072521 807252T1 8M0089715 Osco 143-DEG Pleasurecraft RO26002E	1	Thermostat		N/A
18-7173	Chrysler/Force/US Marine 25-30224 GLM 82250 Johnson/Evinrude Outboard 310327 Mallory 9-76501 Mercruiser Stern Drive 25-30224 25-30224Q Mercury Marine 25-27018 25-30224 25-30224Q OMC Stern Drive 310327	1	O-Ring		N/A

Key Features:

• 140°F

Additional Details:

• Fits: 1982 & older Ford & GM V-8 engines w/standard cooling & 1996 & older hi-performance models
• Fits: engines with closed cooling

Interchanges/Replaces

GLM

• 13380

Mallory

• 9-43151

Mercruiser Stern Drive

• 807252Q3
• 807252T6

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-2553	GLM 31460 Mallory 9-60005 Mercruiser Stern Drive 27-47510 27-47510Q Osco 47510	1	Thermostat Cover Gasket		N/A
18-2834	Barr MC472760208 GLM 31620 Mallory 9-60011 Mercruiser Stern Drive 27-60208	1	Thermostat Cover Gasket		N/A
18-2844	Barr MC472748818 GLM 31510 Mallory 9-60010 Mercruiser Stern Drive 27-48818 27-488181 27-48818Q01	1	Thermostat Gasket		N/A
18-2917	GLM 31560 GM 3701777 Mallory 9-60007 9-60007-10 Mercruiser Stern Drive 27-33179 27-53045 27-530451 27-53045B1 F10077105 FI1101276 FI1101291 FI5000096 OMC Inboard 3701777 OMC Stern Drive 3701777	1	Thermostat Gasket		N/A
18-3551	Chrysler Inboard 4142885 Crusader 96319 GLM 13030 Mallory 9-43013 Mercruiser Stern Drive 32728 35884 59137 59137A1 67464 8052731 8072521 807252T1 8M0089715 Osco 143-DEG Pleasurecraft RO26002E	1	Thermostat		N/A

Additional Details:

• Fits: 1987 & newer GM engines with standard cooling requiring a 160° thermostat
• Temperature rating: 160°F

Interchanges/Replaces

GLM

• 13101

Mallory

• 9-43157

Mercruiser Stern Drive

• 807252Q5
• 807252T8

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-2552	GLM 31670 Mallory 9-60008 Mercruiser Stern Drive 27-331791 27-331792 27-33179B2	1	Thermostat Cover Gasket		N/A
18-2553	GLM 31460 Mallory 9-60005 Mercruiser Stern Drive 27-47510 27-47510Q Osco 47510	1	Thermostat Cover Gasket		N/A
18-2844	Barr MC472748818 GLM 31510 Mallory 9-60010 Mercruiser Stern Drive 27-48818 27-488181 27-48818Q01	1	Thermostat Gasket		N/A
18-2917	GLM 31560 GM 3701777 Mallory 9-60007 9-60007-10 Mercruiser Stern Drive 27-33179 27-53045 27-530451 27-53045B1 F10077105 FI1101276 FI1101291 FI5000096 OMC Inboard 3701777 OMC Stern Drive 3701777	1	Thermostat Gasket		N/A
18-3649	Crusader 97895 GLM 13100 Mallory 9-43002 Mercruiser Stern Drive 8052732 8072522 807252T2 8M0091470 8M0109441	1	Thermostat		N/A
18-7173	Chrysler/Force/US Marine 25-30224 GLM 82250 Johnson/Evinrude Outboard 310327 Mallory 9-76501 Mercruiser Stern Drive 25-30224 25-30224Q Mercury Marine 25-27018 25-30224 25-30224Q OMC Stern Drive 310327	1	O-Ring		N/A
18-0398	GLM 35060 Mallory 9-60009 Mercruiser Stern Drive 27-33918 27-8M2021920 OMC Stern Drive 312797 3852111 Volvo Penta 3852111 835417 856347	1	Thermostat Gasket		N/A

Additional Details:

• For: GM 454 (7.4L) CID Eng
• Production Models: oval port

Interchanges/Replaces

GLM

• 39020

Mallory

• 9-61102

Mercruiser Stern Drive

• 27-801853

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-3877	Chris-Craft 16.50-00259 Crusader 30266 GLM 36110 Mallory 9-63701 Mercruiser Stern Drive 27-13218 27-13687 27-19315 27-49104 27-61224 27-8M0049045 27-97529 OMC Stern Drive 914849	2	Head Gasket
18-0464	GLM 30350 Mallory 9-61302 Mercruiser Stern Drive 27-49121 27-91831 OMC Stern Drive 912768	2	Valve Cover Gasket
18-2917	GLM 31560 GM 3701777 Mallory 9-60007 9-60007-10 Mercruiser Stern Drive 27-33179 27-53045 27-530451 27-53045B1 F10077105 FI1101276 FI1101291 FI5000096 OMC Inboard 3701777 OMC Stern Drive 3701777	1	Thermostat Gasket		N/A
18-2844	Barr MC472748818 GLM 31510 Mallory 9-60010 Mercruiser Stern Drive 27-48818 27-488181 27-48818Q01	1	Thermostat Gasket		N/A
18-0348	GLM 39490 Mallory 9-61501 Mercruiser Stern Drive 27-49107 27-52550 FI1100229 FI5000229 FI5000245 OMC Inboard 3931593	1	Oil Pan Gasket Set		N/A
18-0980	GLM 30440 Mercruiser Stern Drive 27-49109 27-54529 FI1100990 FI110990 OMC Inboard 3935449 OMC Stern Drive 3935449	1	Timing Cover Gasket		N/A
18-0903	GLM 31770 Mallory 9-60066 Mercruiser Stern Drive 27-49110 FI1101000 OMC Stern Drive 3853361 914874 Volvo Penta 3853361 856610 Yamaha Sterndrive YSG-38600-39-G0	2	Water Pump Gasket
18-0885-1	Barr MC472748042 GLM 31480 Mercruiser Stern Drive 27-48042	4	Exhaust Elbow Gasket
18-2832-1	Barr MC47-27-48043 GLM 31490 Mallory 9-61424 Mercruiser Stern Drive 27-48043 27-480431 Osco 48043	4	Manifold End Cap Gasket
18-0418	Barr CHVA470000 MC47-27-46820 Crusader 96653 GLM 33760 Mallory 9-61400 Mercruiser Stern Drive 27-46820 OMC Inboard 909613 OMC Stern Drive 3852472 909613 Osco CW-GH Volvo Penta 3852472	2	Exhaust Manifold Mounting Gasket
18-4022	Mallory 9-61652 Mercruiser Stern Drive 26-49131 26-67863 26-75982 26-75988 F3866612 FI1100968 FI1101117	16	Valve Stem Seal
18-2848	GLM 30380 Mallory 9-61004 Mercruiser Stern Drive 27-52457 27-524571 27-524572	2	Carburetor Base Gasket
18-0897	Barr MC 20 99208 MC47-27-41813 GLM 30240 Mallory 9-61413 Mercruiser Stern Drive 27-41813 27-860233 27-863724 Osco 8503-GR	2	Exhaust Elbow Gasket
18-2849-1	Barr MC 47 27 87105 GLM 32080 Mallory 9-61414 Mercruiser Stern Drive 27-818832 27-860232 27-863726 27-87105 27-871051 Osco 8503-GO	4	Exhaust Elbow Gasket
18-2554	GLM 31630 Mallory 9-60006 Mercruiser Stern Drive 27-41812 27-41812B 27-41812Q 27-90556 Osco 41812	2	Thermostat Cover Gasket

Additional Details:

• Fits: MCM/MIE GM V-8 (305 & 350 cid) engines (1986 & older)

Interchanges/Replaces

GLM

• 39690

Mercruiser Stern Drive

• 27-75611A1
• 27-75611A2

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-0518	Mercruiser Stern Drive 26-34217 FI1100152 OMC Stern Drive 3853132 3854956 914323 Volvo Penta 3853132 3854956 914323	16	Valve Stem Seal		N/A
18-0868	Chris-Craft 16.50-00232 GLM 30860 Mallory 9-61200 Mercruiser Stern Drive 27-17145 27-72637 FI1101296 FI5000232 FI5000263 OMC Stern Drive 3854269 985630 Volvo Penta 3854269	1	Intake Manifold Gasket Set		N/A
18-2553	GLM 31460 Mallory 9-60005 Mercruiser Stern Drive 27-47510 27-47510Q Osco 47510	1	Thermostat Cover Gasket		N/A
18-2554	GLM 31630 Mallory 9-60006 Mercruiser Stern Drive 27-41812 27-41812B 27-41812Q 27-90556 Osco 41812	2	Thermostat Cover Gasket		N/A
18-2844	Barr MC472748818 GLM 31510 Mallory 9-60010 Mercruiser Stern Drive 27-48818 27-488181 27-48818Q01	1	Thermostat Gasket		N/A
18-2845	Chris-Craft 16.11-01236 Crusader 91351 GLM 30353 Mallory 9-61300 Mercruiser Stern Drive 27-11999 27-34043 27-52202 FI1101236 FI5000161 OMC Stern Drive 912965	2	Valve Cover Gasket		N/A
18-2848	GLM 30380 Mallory 9-61004 Mercruiser Stern Drive 27-52457 27-524571 27-524572	2	Carburetor Base Gasket		N/A
18-2917	GLM 31560 GM 3701777 Mallory 9-60007 9-60007-10 Mercruiser Stern Drive 27-33179 27-53045 27-530451 27-53045B1 F10077105 FI1101276 FI1101291 FI5000096 OMC Inboard 3701777 OMC Stern Drive 3701777	1	Thermostat Gasket		N/A
18-3876	Chris-Craft 16.50-00250 Crusader 7057500 GLM 36160 GM 6269577 Mallory 9-63706 Mercruiser Stern Drive 27-34278 27-48330 27-75611 27-75611001 OMC Stern Drive 313201 3853380 910089 914971 Volvo Penta 3853380 841207 856474	2	Head Gasket		N/A
18-2949	Barr CHV-47-000 MC 47 27 33395 Crusader 96306 GLM 31100 Mercruiser Stern Drive 27-33395 27-33395B Osco CV-GH Volvo Penta 835966 856034	2	Exhaust Manifold Gasket

Additional Details:

• Material: Stainless Steel
• Fits: MCM/MIE GM V-8 (454 & 502 cid) engines

Use With:

• 18-1989K: Thermostat Service Kit

Interchanges/Replaces

Mallory

• 9-42500

Mercruiser Stern Drive

• 861006A1
• 8M0061381

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-4264	GLM 21894 Mallory 9-40546 Mercruiser Stern Drive 22-32803 22-87543 FI5880010 Mercury Marine 22-32803	3	Pipe Plug
18-2917	GLM 31560 GM 3701777 Mallory 9-60007 9-60007-10 Mercruiser Stern Drive 27-33179 27-53045 27-530451 27-53045B1 F10077105 FI1101276 FI1101291 FI5000096 OMC Inboard 3701777 OMC Stern Drive 3701777	1	Thermostat Gasket		N/A
NSS	Mercruiser Stern Drive 23-806922	1	Sleeve	No Image	N/A

Use With:

• 18-1989: Thermostat Housing

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-2917	GLM 31560 GM 3701777 Mallory 9-60007 9-60007-10 Mercruiser Stern Drive 27-33179 27-53045 27-530451 27-53045B1 F10077105 FI1101276 FI1101291 FI5000096 OMC Inboard 3701777 OMC Stern Drive 3701777	1	Thermostat Gasket		N/A
18-2554	GLM 31630 Mallory 9-60006 Mercruiser Stern Drive 27-41812 27-41812B 27-41812Q 27-90556 Osco 41812	1	Thermostat Cover Gasket		N/A
18-2844	Barr MC472748818 GLM 31510 Mallory 9-60010 Mercruiser Stern Drive 27-48818 27-488181 27-48818Q01	1	Thermostat Gasket		N/A

Additional Details:

• Temperature Rating: 150° (66 C)

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-3615	Volvo Penta 3587597	1	Thermostat - Raw Water		N/A
18-2917	GLM 31560 GM 3701777 Mallory 9-60007 9-60007-10 Mercruiser Stern Drive 27-33179 27-53045 27-530451 27-53045B1 F10077105 FI1101276 FI1101291 FI5000096 OMC Inboard 3701777 OMC Stern Drive 3701777	1	Thermostat Gasket		N/A
NSS	Yamaha 93210-45161-00	1	O-Ring	No Image	N/A