Sierra Marine Parts Catalog

742 I/O — MERCRUISER - Cooling System THERMOSTAT APPLICATION (Cont.) Engine/Model CID/#CYL YearRange Beginning Serial# EndingSerial# Housing Thermostat Cover Thermostat& GasketKit Thermostat GasketsReq. Gaskets Req.- Design II GasketsReq.- Design III 3.0L 181/L4 1987-1989 B450801 C856558 18-3650 ➂ 18-3650 18-3550 18-2831 3.0L, FWC 181/L4 1990-2010 C856559 UP ❻ 18-3647 18-3649 3.0L 181/L4 1990-1994 C856559 F603999 18-3650 ❼ , ➂ 18-3650 18-3550 18-2831 3.0L 181/L4 2000-2010 L341000 &UP ❼ 18-3647 18-3649 18-2552 3.0L 181/L4 1998-2000 L010042 L340999 18-3650 ❼ , ➂ 18-3650 18-3550 18-2831 3.0L MPI 181/L4 2008-2010 A072812 &UP 18-3647 18-3649 18-2552 3.0L MPI FWC 181/L4 2008-2010 A072812 &UP ❻ 18-3647 18-3649 3.0LX,FWC 181/L4 1990-1997 C856559 K999999 ❻ 18-3647 18-3649 3.0LX 181/L4 1990-1997 C856559 K999999 18-1910 ❼ , ➂ 18-3650 18-3550 18-2831 150 1666495 2048046 — 18-3551 — 160 ➀ 2048022 2770031 — 18-3551 — 160 ➁ 2048022 2233574 — 18-3557 — 160 ➁ 2326069 2770031 — 18-3557 18-2831 165 2770032 5813433 — 18-3650 18-3550 18-2831 165 224/L4 1987 B434941 B774251 18-3667 18-3555 18-2555 165 6916779 UP — 18-3667 18-3555 18-2555 170 224/L4 1985-1986 6916779 B434940 18-3667 18-3667 18-3555 18-2555 175/4.3L,4.3LX(262CID) ➂ B527955 UP — 18-3668 18-3551 18-2553 18-2554 175/4.3L,4.3LX(262CID) ➃ B527955 UP — 18-3668 18-3551 18-2552 18-7173 175/4.3L,4.3LX(262CID) ➃ F001220 UP — 18-3648 18-3649 ♣ 18-2552 18-7173 180/3.7L-LX(4CYL) 6916779 UP — 18-3667 18-3555 18-2555 180 224/L4 1987 B436391 B775248 18-3667 18-3555 18-2555 185(229CID) 6330183 6919655 18-1994 ♥ 18-3668 18-3551 18-2553 18-2554 185(262CID) A331455 B527954 18-1994 ♥ 18-3668 18-3551 18-2553 18-2554 190 1564539 1730903 — 18-3551 — — 190 224/L4 1985-1986 6916779 B436390 18-3667 18-3555 18-2555 3.7L 224/L4 1988-1989 B774552 &UP 18-3667 18-3555 18-2555 3.7LX 224/L4 1988-1989 B775249 &UP 18-3667 18-3555 18-2555 470 MCM/MIE 224/L4 1976-1982 4208730 6218036 18-3552 18-2843 470 224/L4 1983-1984 6218037 6916778 18-3667 18-3555 18-2555 485 224/L4 1980-1982 5685394 6218036 18-3552 18-2555 488 224/L4 1983-1984 6170297 6916778 18-3667 18-3555 18-2555 140 (6CYL) 194/L6 1963 1538930 1725960 18-3551 150 230/L6 1964-1966 1666495 2048046 ❹ 18-3551 150 230/L6 1964-1966 1727985 2048046 ❺ 18-3551 160 250/L6 1967-1969 2048022 2770031 ❹ 18-3551 160 250/L6 1967 2048022 2233574 ❺ 18-3551 160 250/L6 1968-1969 2326096 2770031 18-1910 ❺ , ➂ 18-3557 18-2831 165 (6CYL) 250/L6 1970-1981 2770032 5813433 18-1910 ➂ 18-3650 18-3550 18-2831 200 (6CYL) 292/L6 1969 2453769 2712072 18-1910 ➂ 18-3557 18-2831 185 (4bbl) 229-V-6 1983-1984 6330183 6919655 18-3678 18-3668 18-3551 18-2554 18-2553 18-2917 175 262/V-6 1987 B527955 B773242 18-1994 ❶ 18-1977-1 18-3668 18-3551 18-2554 18-2553 18-2917 175 262/V-6 1987 B527955 B773242 ❷ , ❽ 18-3668 18-3551 18-7173 18-2917 185 (2bbl) 262/V-6 1985-1986 A331455 B527954 18-1994 18-1977-1 18-3668 18-3551 18-2554 18-2553 18-2917 205 262/V-6 1985-1986 A331455 B527954 18-3668 18-1977-1 18-3668 18-3551 18-2554 18-2553 18-2917 205 262/V-6 1987 B527955 B775129 18-3668 ❶ 18-1977-1 18-3668 18-3551 18-2554 18-2917 205 262/V-6 1967 B527955 B775129 ❷ , ❽ 18-3668 18-3551 18-7173 18-2552 18-2917 205/4.3L,4.3LX(262CID) ➃ B527955 D714369 — ❼ 18-3668 18-3551 18-2552 18-7173 205/4.3L,4.3LX(262CID) ➃ F001220 UP — 18-3648 18-3649 ♣ 18-2552 18-7173 ❶ Design I ❷ Design II ❸ Design III ❹ Aluminum Exhaust Manifold ❺ Cast Iron Exhaust Manifold ❻ Closed Cooling ❼ Standard Cooling ❽ With check ball ❾ Without check ball ❿ SN 4167000 & Up ➀ Original thermostat housing listed as NLA. Order update kit 87290A23 ➁ Original thermostat housing listed as NLA. Order update kit 90736A24 ➂ Complete thermostat housing kit kit ➃ Single and 3-point drain system ➄ 7-point drain system ➅ Mechanical Throttle Body ➆ Digital Throttle Body ➇ Emission Control Engine ➈ Manual drain system ➉ Air Actuated drain system ☞ Old Design ♠ New Design ♣ 160 degree ♥ For Stainless Steel version use 18-1989