Sierra Marine Parts Catalog

745 THERMOSTAT APPLICATION (Cont.) I/O — MERCRUISER - Cooling System Engine/Model CID/#CYL YearRange Beginning Serial# EndingSerial# Housing Thermostat Cover Thermostat& GasketKit Thermostat GasketsReq. Gaskets Req.- Design II GasketsReq.- Design III 225 (GM) 327/V-8 1967-1969 2399198 2694014 18-1977-1 18-3651 18-3551 18-2553 18-2844 225 (GM) 327/V-8 1963-1967 1539620 2399197 N.L.A. 18-3551 225 (GM) 2278647 2399197 18-3668 18-3551 18-2552 18-7173 225/225SFORD 3385721 UP 18-3651 18-3551 18-2834 250 MCM/MIE 327/V-8 1968-1969 2314301 2639854 18-1977-1 18-3651 18-3551 18-2553 18-2844 250 350/V-8 1977 4768000 4908849 18-1993 18-1977-1 18-3651 18-3551 18-2844 250 (GM) 4768000 4908849 18-3646 18-3551 18-2844 250 (GM) 4175500 5907057 18-1993 18-3651 18-3649 18-2844 18-2917 255 (GM) 350/V-8 1975-1976 4175500 4767999 18-1977-1 18-3646 18-3551 18-2844 18-0398 255 (GM) MIE 350/V-8 1975-1980 4175500 5907057 18-1977-1 18-3646 18-3551 18-2844 18-0398 255 (GM) MIE 350/V-8 1979-1980 5195909 5907057 18-1993 255FORD 3258728 UP 18-3651 18-3551 18-2834 — 255FORDMCM/MIE 3258728 4178299 18-3646 18-3649 18-2834 — 260 350/V-8 1978-1982 4908850 6218461 18-1993 18-1977-1 18-3651 18-3551 18-2844 18-0398 260 350/V-8 1982-1987 6218462 B773304 18-1994 18-1977-1 18-3668 18-3551 18-2554 18-2553 18-2917 260 MIE FWC 350/V-8 1981-1987 5907058 B788151 ❻ 18-1977-1 18-3646 18-3551 18-2553 18-2844 18-2917 260 MIE 350/V-8 1981-1987 5907058 B788151 18-1994 ❼ 18-1977-1 18-3668 18-3551 18-2554 18-2553 18-2917 260GM 6218462 B525981 18-1994 ♥ 18-3668 18-3551 18-2553 18-2554 260GM 4908850 6218461 18-3646 18-3649 18-2844 18-2917 260GM IB ➄ 5907058 B522505 ❼ 18-3668 18-3551 18-2553 18-2554 260GM IB ➅ 5907058 B522505 ❻ 18-3651 18-3551 18-2553 18-2844 260MIE 5907058 0B522505 18-3646 18-3649 18-2553 18-2844 18-2917 260/5.7LGM IB ➂➄ B522506 B525981 ☞ , ❼ 18-3668 18-3551 18-2553 18-2554 260/5.7LGM IB ➃➄ B522506 B525981 ♠ , ❼ 18-3668 18-3551 18-2552 18-7173 260/5.7LGM IB ➃ ➄ B522506 B525981 ♠ , ❼ 18-3648 18-3649 ♣ 18-2552 18-7173 260/5.7LGM IB ➅ B522506 B525981 ❻ 18-3651 18-3551 18-2553 18-2844 260/5.7LGM ➂ B525982 F600999 18-1994 ♥ 18-3668 18-3551 ☞ 18-2553 18-2554 260/5.7LGM ➃ B525982 F600999 18-3668 18-3551 ♠ 18-2552 18-7173 260/5.7LGM ➃ B525982 F600999 18-3648 18-3649 ♣ 18-2552 18-7173 260/5.7LGM 0B525982 0F600999 18-3647 18-3649 18-2917 — 260/5.7LMIE 0B522506 0F024999 18-3646 18-3649 18-2553 18-2844 18-2917 270 MCM/MIE 350/V-8 1969-1972 2851074 3385720 18-1977-1 18-3646 18-3551 18-2553 18-2844 18-2917 270 GM 2851074 3077735 18-3651 18-3551 18-2553 18-2844 280 GM 350/V-8 1975-1976 4176250 4770199 18-1977-1 18-3646 18-3649 18-2844 18-0398 280GMTRS 4176250 4770199 18-1993 18-3651 18-3551 18-2844 300 350/V-8 1985-1986 6668677 B430367 18-1977-1 18-3668 18-3551 18-2554 18-2553 18-2917 320 EFI 350/V-8 1987-1989 A543604 C622418 18-1977-1 18-3646 18-3551 18-2553 18-2844 18-2917 325GMMCM/MIE 2278747 3780449 18-3646 18-3649 18-2553 18-2844 18-2917 325GM 2278747 2313964 18-3668 18-3551 18-2553 — 325GM 2313965 3042730 18-3651 18-3551 18-2553 18-2844 325GM 3042731 UP 18-3651 18-3551 18-2844 — 330GM 4623115 UP 18-3651 18-3551 18-2844 — 330GMMCM/MIE 4623115 0B816540 18-3646 18-3649 18-2553 18-2844 18-2917 330GMW/BW ➄ 6083145 UP ❼ 18-3668 18-3551 18-2553 18-2554 330GMW/BW ➅ 6083145 UP ❻ 18-3651 18-3551 18-2553 18-2844 350 MAG ALPHA 350/V-8 1987-1995 B525982 F600999 ❷ , ❽ 18-3668 18-3551 18-7173 18-2917 350 MAG ALPHA 350/V-8 1986-1995 A635178 B525981 ❶ 18-1977-1 18-3668 18-3551 18-2554 18-2553 18-2917 350 MAG ALPHA 350/V-8 1987-1995 B525982 F600999 ❷ , ❾ 18-3668 18-3551 18-7173 18-2552 18-2917 350 MAG ALPHA 350/V-8 1987-1997 B525982 K999999 ❸ 18-3647 18-3649 18-0398 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