Page 781 - 2021 Sierra Catalog

I/O — MERCRUISER - Cooling System
Engine/Model
CID/#CYL
Year Range
1963-1967
1968-1969 1977
1975-1976 1975-1980 1979-1980
1978-1982 1982-1987 1981-1987 1981-1987
Beginning Ending Serial # Serial #
1539620 2399197 2278647 2399197 3385721 UP 2314301 2639854 4768000 4908849 4768000 4908849 4175500 5907057 4175500 4767999 4175500 5907057 5195909 5907057 3258728 UP 3258728 4178299 4908850 6218461 6218462 B773304 5907058 B788151 5907058 B788151 6218462 B525981 4908850 6218461 5907058 B522505 5907058 B522505 5907058 0B522505 B522506 B525981 B522506 B525981 B522506 B525981 B522506 B525981 B525982 F600999 B525982 F600999 B525982 F600999 0B525982 0F600999 0B522506 0F024999 2851074 3385720 2851074 3077735 4176250 4770199 4176250 4770199 6668677 B430367 A543604 C622418 2278747 3780449 2278747 2313964 2313965 3042730 3042731 UP 4623115 UP 4623115 0B816540 6083145 UP 6083145 UP B525982 F600999 A635178 B525981 B525982 F600999 B525982 K999999 F800300 K999999
Housing
N.L.A.
Thermostat Cover
18-1977-1 18-1977-1
18-1977-1 18-1977-1
18-1977-1 18-1977-1 18-1977-1 18-1977-1
Thermostat & Thermostat Gasket Kit
Gaskets Req. Gaskets Req. -
Design II
18-2552 18-7173 18-2834
18-2553 18-2844 18-2844
18-2844
18-2844 18-2917 18-2844 18-0398 18-2844 18-0398
18-2834 — 18-2834 — 18-2844 18-0398 18-2554 18-2553 18-2553 18-2844 18-2554 18-2553 18-2553 18-2554 18-2844 18-2917 18-2553 18-2554 18-2553 18-2844 18-2553 18-2844 18-2553 18-2554 18-2552 18-7173 18-2552 18-7173 18-2553 18-2844 18-2553 18-2554 18-2552 18-7173 18-2552 18-7173 18-2917 — 18-2553 18-2844 18-2553 18-2844 18-2553 18-2844 18-2844 18-0398 18-2844
Gaskets Req. - Design III
225 (GM)
225 (GM)
225/225S FORD
250 MCM/MIE
250
250 (GM)
250 (GM)
255 (GM)
255 (GM) MIE
255 (GM) MIE
255 FORD
255 FORD MCM/MIE 260
260
260 MIE FWC
260 MIE
260 GM
260 GM
260 GM IB
260 GM IB
260 MIE
260/5.7L
260/5.7L
260/5.7L
260/5.7L
260/5.7L
260/5.7L
260/5.7L
260/5.7L
260/5.7L
327/V-8
327/V-8 350/V-8
350/V-8 350/V-8 350/V-8
350/V-8 350/V-8 350/V-8 350/V-8
➄ ➅
➂ ➄ ➃ ➄ ➃ ➄ ➅
➂ ➃ ➃
350/V-8 350/V-8
350/V-8 350/V-8
➄
➅ 350/V-8 350/V-8 350/V-8 350/V-8 350/V-8
18-1994
❻ 18-1994 ❼ 18-1994 ♥
❼ ❻
☞,❼ ♠,❼ ♠,❼
❻ 18-1994 ♥
18-3551 18-3668 18-3551 18-3651 18-3551 18-3651 18-3551 18-3651 18-3551 18-3646 18-3551 18-3651 18-3649 18-3646 18-3551 18-3646 18-3551
18-3651 18-3551 18-3646 18-3649 18-3651 18-3551 18-3668 18-3551 18-3646 18-3551 18-3668 18-3551 18-3668 18-3551 18-3646 18-3649 18-3668 18-3551 18-3651 18-3551 18-3646 18-3649 18-3668 18-3551 18-3668 18-3551 18-3648 18-3649 18-3651 18-3551 18-3668 18-3551 18-3668 18-3551 18-3648 18-3649 18-3647 18-3649 18-3646 18-3649 18-3646 18-3551 18-3651 18-3551 18-3646 18-3649 18-3651 18-3551 18-3668 18-3551 18-3646 18-3551 18-3646 18-3649 18-3668 18-3551 18-3651 18-3551 18-3651 18-3551 18-3651 18-3551 18-3646 18-3649 18-3668 18-3551 18-3651 18-3551 18-3668 18-3551 18-3668 18-3551 18-3668 18-3551 18-3647 18-3649 18-3647 18-3649
18-2917 18-2917 18-2917
18-2917
18-2917 18-2917
270
270
280
280
300
320
325
325
325
325
330
330
330
330
350
350
350
350
1969-1972 1975-1976
1985-1986 1987-1989
1987-1995 1986-1995 1987-1995 1987-1997 1996-1997
18-1977-1 18-1977-1
18-1977-1 18-1977-1
18-2554 18-2553
18-2553 18-2844
18-2553 18-2844
18-2553 —
18-2553 18-2844
18-2844 —
18-2844 —
18-2553 18-2844
18-2553 18-2554
18-2553 18-2844
18-7173 18-2917
350 (GEN +)
GM GM GM GM GM GM GM GM MIE
IB IB IB IB
MCM/MIE GM
GM
GM TRS
EFI
GM MCM/MIE GM
GM
GM
GM
GM MCM/MIE GM W/BW GM W/BW
MAG ALPHA MAG ALPHA MAG ALPHA MAG ALPHA MAG ALPHA EFI
♣
☞ ♠ ♣
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
763
THERMOSTAT APPLICATION (Cont.)
❼
❻ ❷,❽ ❶ ❷,❾ ❸
18-1977-1
18-2554 18-2553 18-7173 18-2552 18-0398
18-0398
18-2917
18-2917 18-2917
18-2917 18-2917 18-2917