Page 778 - 2021 Sierra Catalog
P. 778
760
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
Engine/Model
CID/#CYL
Year Range
1987-1989 1990-2010 1990-1994 2000-2010 1998-2000 2008-2010 2008-2010 1990-1997 1990-1997
1987 1985-1986
1987
1985-1986 1988-1989 1988-1989 1976-1982 1983-1984 1980-1982 1983-1984 1963 1964-1966 1964-1966 1967-1969 1967 1968-1969 1970-1981 1969 1983-1984 1987 1987 1985-1986 1985-1986 1987 1967
Beginning Serial #
B450801 C856559 C856559 L341000 L010042 A072812 A072812 C856559 C856559 1666495 2048022 2048022 2326069 2770032 B434941 6916779 6916779 B527955 B527955 F001220 6916779 B436391 6330183 A331455 1564539 6916779 B774552 B775249 4208730 6218037 5685394 6170297 1538930 1666495 1727985 2048022 2048022 2326096 2770032 2453769 6330183 B527955 B527955 A331455 A331455 B527955 B527955 B527955 F001220
Ending Serial #
C856558 UP F603999 &UP L340999 &UP &UP K999999 K999999 2048046 2770031 2233574 2770031 5813433 B774251 UP B434940 UP
UP
UP
UP B775248 6919655 B527954 1730903 B436390 &UP &UP 6218036 6916778 6218036 6916778 1725960 2048046 2048046 2770031 2233574 2770031 5813433 2712072 6919655 B773242 B773242 B527954 B527954 B775129 B775129 D714369 UP
Housing
18-3650 ➂
❻
18-3650 ❼,➂ ❼
18-3650 ❼,➂
❻
❻
18-1910 ❼,➂ —
—
—
—
—
— 18-3667 —
—
—
—
18-1994 ♥ 18-1994 ♥ —
❹
❺
❹
❺
18-1910 ❺,➂ 18-1910 ➂ 18-1910 ➂ 18-3678 18-1994 ❶ ❷,❽ 18-1994 18-3668 18-3668 ❶ ❷,❽
—❼ —
Thermostat Cover
Thermostat & Gasket Kit
18-3650 18-3647 18-3650 18-3647 18-3650 18-3647 18-3647 18-3647 18-3650
18-3650 18-3667 18-3667 18-3667 18-3668 18-3668 18-3648 18-3667 18-3667 18-3668 18-3668
18-3667 18-3667 18-3667
18-3667 18-3667
18-3650
18-3668 18-3668 18-3668 18-3668 18-3668 18-3668 18-3668 18-3668 18-3648
Thermostat Gaskets Req. Gaskets Req. -
Design II
18-3550 18-2831 18-3649
18-3550 18-2831 18-3649 18-2552 18-3550 18-2831 18-3649 18-2552 18-3649
18-3649
18-3550 18-2831
18-3551 —
18-3551 —
18-3557 —
18-3557 18-2831
18-3550 18-2831
18-3555 18-2555
18-3555 18-2555
18-3555 18-2555
18-3551 18-2553 18-2554 18-3551 18-2552 18-7173 18-3649 ♣ 18-2552 18-7173 18-3555 18-2555
18-3555 18-2555
18-3551 18-2553 18-2554 18-3551 18-2553 18-2554 18-3551 — — 18-3555 18-2555
18-3555 18-2555
18-3555 18-2555
18-3552 18-2843
18-3555 18-2555
18-3552 18-2555
18-3555 18-2555
18-3551
18-3551
18-3551
18-3551
18-3551
18-3557 18-2831
18-3550 18-2831
18-3557 18-2831
18-3551 18-2554 18-2553 18-3551 18-2554 18-2553 18-3551 18-7173
18-3551 18-2554 18-2553 18-3551 18-2554 18-2553 18-3551 18-2554
18-3551 18-7173 18-2552 18-3551 18-2552 18-7173 18-3649 ♣ 18-2552 18-7173
Gaskets Req. - Design III
3.0L
3.0L, FWC
3.0L
3.0L
3.0L
3.0L MPI
3.0L MPI FWC
3.0LX, FWC
3.0LX
150
160
160
160
165
165
165
170
175/4.3L, 4.3LX (262 CID) 175/4.3L, 4.3 LX (262 CID) 175/4.3L, 4.3 LX (262 CID) 180/3.7L-LX (4 CYL)
180
185 (229 CID)
185 (262 CID)
190
190
3.7L
3.7LX
470 MCM/MIE
470
485
488
140 (6 CYL)
150
150
160
160
160
165 (6 CYL)
200 (6 CYL)
185 (4bbl)
175
175
185 (2bbl)
205
205
205
205/4.3L, 4.3 LX (262 CID) 205/4.3L, 4.3 LX (262 CID)
181/L4 181/L4 181/L4 181/L4 181/L4 181/L4 181/L4 181/L4 181/L4
➀ ➁ ➁
224/L4 224/L4
➂ ➃ ➃
224/L4
224/L4 224/L4 224/L4 224/L4 224/L4 224/L4 224/L4 194/L6 230/L6 230/L6 250/L6 250/L6 250/L6 250/L6 292/L6 229-V-6 262/V-6 262/V-6 262/V-6 262/V-6 262/V-6 262/V-6 ➃
➃
18-1977-1
18-1977-1 18-1977-1 18-1977-1
18-2917 18-2917 18-2917 18-2917 18-2917 18-2917 18-2917
THERMOSTAT APPLICATION (Cont.)
I/O — MERCRUISER - Cooling System
