Page 785 - 2021 Sierra Catalog

I/O — MERCRUISER - Cooling System
Engine/Model
CID/#CYL
Year Range
1982-1987 1977-1980
1981-1987 1981-1987 1981-1987
1974-1976
1978-1985 1985-1987
1980-1986
1987-1989 1990-1993 1983-1986 1995-1996 1991-1999 1986-1988 1986-1988 1988-1992 1995-1997 1988-1992 1992-1994 1995-1997 1995-1997 1996-2001 1998-2001 1998-2001
1996-1997 1991-1999 1995-1997 1988-1991 1988-1991 1992-1994 1996-1997 1996-1997 1988-1992 1988-1992 1989-1994 1989-1994
Beginning Serial #
6083145 4623115
5889914 5889914 5889914 5889914 3780450 A635178 B525982 B525982 B525982 4179554 6721528 4179554 6721528 2781129 2781129 4179554 4179554 A398941 A398941 A398941 4179554 F347100 D456000 A631894 A631894 B721206 F305000 B721206 D805069 F115700 F215800 F802350 L010029 L002200
F820100 D456000 0F352000 B771113 B771113 D603118 F874815 F874815 B788366 B788366 C391564 C391564
Ending Serial #
B816540 5889913
B788365 B788365 B788365 0D715493 4623109 B525981 UP
UP
UP 6721527 B714586 6721527 UP 2825059 3042731 0B457644 UP
UP B622418 D937011 B485220 F347277 L415623 B785148 B785148 D805068 K999999 D805068 F304999 F802349 K999999 M024999 M024999 L674000
K999999 L415623 0K999999 D603117 D603117 F351999 K999999 K999999 D715493 D715493 D715493 D715493
Housing
18-3678
❻
18-3678 ❼,❾
☞
♠ 18-3648
18-3651 18-1994 18-3678
18-1994
Thermostat Thermostat & Thermostat Cover Gasket Kit
Gaskets Req.
18-2554 18-2844
18-2553 18-2554 18-2554 18-2553 18-2844 18-2553 18-2553 18-2552 18-2552 18-2553 18-2554 18-2553 18-2553 18-2553 18-2553 18-2553 18-2553 18-2553 18-2553
18-2553
18-2554 18-7173 18-2554 18-0398 18-7173 18-7173 18-0398 18-0398 18-0398 18-0398 18-0398
18-0398
18-0398 18-2554 18-7173 18-7173 18-0398 18-0398 18-2553 18-2554 18-7173 18-2553
Gaskets Gaskets Req. - Req. - Design III Design II
18-2553 18-0398 18-0398
18-2844 18-0398 18-2844 18-0398 18-2553 18-0398 18-2844 18-2917 18-0398
18-2554
18-2554
18-7173
18-7173
18-2844 18-0398 18-2553 18-0398 18-2844
18-2554
18-2844
18-2844 18-2917 18-2554 18-0398 18-2844
18-2844
18-2844 18-0398 18-2553 18-0398 18-2844 18-0398 18-2553 18-0398 18-2553 18-0398 18-2553 18-0398
18-2552 18-3098
18-2553 18-0398
18-0398 18-0398
18-2553 18-0398
18-2553 18-0398 18-2552 18-0398 18-2552 18-0398
18-2844 18-0398 18-2553 18-0398 18-2552 18-0398 18-2844 18-0398
330 (WITHB/W)
330 MIE (WITH MERC TRANS)
340 MIE FWC 340 MIE
340 MIE 340/7.4L MIE 350 MIE
350 GM (MAGNUM) 350 GM (MAGNUM) 350 GM (MAGNUM) 350 GM (MAGNUM) 370
370
370 TRS GM
370 TRS GM
390 GM
390 GM MCM/MIE
400
400 TRS GM
420 GM
420
425
440
450
525 SC
454 MAG ALPHA
454 MAG ALPHA
454 MAG BRAVO
454 MAG BRAVO
454 MAG BRAVO
454 MAG BRAVO
454 MAG EFI
454 MAG EFI SKI
454 MAG MPI
454 MAG MPI FWC
454 MAG MPI HORI- ZON MIE
454 MAG MPI SKI 525 SC
7.4L BRAVO
7.4L BRAVO
7.4L BRAVO
7.4L BRAVO
7.4L EFI MIE
7.4L EFI MIE FWC 7.4L MIE FWC 7.4L MIE
7.4L MIE
7.4L MIE FWC
454/V-8 454/V-8
454/V-8 454/V-8 454/V-8
454/V-8
♣
♣
♣ 454/V-8 454/V-8
454/V-8
454/V-8 454/V-8 454/V-8 454/V-8 454/V-8 454/V-8 454/V-8 454/V-8 454/V-8 454/V-8 454/V-8 454/V-8 454/V-8 454/V-8 454/V-8 454/V-8
454/V-8 454/V-8 454/V-8 454/V-8 454/V-8 454/V-8 454/V-8 454/V-8 454/V-8 454/V-8 454/V-8 454/V-8
❼
❼
♠
18-3668 18-3551 18-3646 18-3551
18-3646 18-3551 18-3668 18-3551 18-3668 18-3551 18-3646 18-3649 18-3646 18-3551 18-3668 18-3551 18-3668 18-3551 18-3668 18-3551 18-3648 18-3649
18-1977-1 18-3646 18-3551 18-3668 18-3551 18-3651 18-3551 18-3668 18-3551 18-3651 18-3551 18-3646 18-3649 18-3646 18-3551 18-3651 18-3551 18-3651 18-3551 18-1977-1 18-3646 18-3551 18-3551 18-3646 18-3551 18-1977-1 18-3551 18-1977-1 18-3551 18-3668 18-3551 18-3668 18-3551 18-3668 18-3551 18-3647 18-3649 18-3668 18-3551 18-3668 18-3551 18-3647 18-3649 18-3647 18-3649 18-3647 18-3649 18-3568 18-3555 18-3568 18-3555
18-3647 18-3649 18-1977-1 18-3551 18-3647 18-3649 18-3668 18-3551 18-3668 18-3551 18-3668 18-3551 18-3647 18-3649 18-3568 18-3555 18-3646 18-3551 18-3668 18-3551 18-3668 18-3551 18-3646 18-3551
♣
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
767
THERMOSTAT APPLICATION (Cont.)
18-3678 ❶ ❷,❽ 18-3678 ❶ ❷,❾ ❷,❾ ❷,❾
❼
❼
❼ 18-3531 ❻ 18-3531 ❻
❼ ❼
18-3678 ❶ ❷,❽ ❷,❾
❼ 18-3531 ❻ ❻
❼,❽ ❼
❻