Sierra Marine Parts Catalog

846 I/O — MERCRUISER - Drive System Sterndrive Model Years Beg. Serial # - End Serial # Prop Bearing Carrier Lower Drive Shaft (Pinion) Upper Drive Shaft Inside Forward Gear (Needle) Outside Forward Gear Reverse Gear I 1963 1536618 - 1684187 18-1158 — — 18-1157 18-1156 — IA,IB,IC & EZ Shift 1964-66 1684188 - 2065189 18-1158 — — 18-1157 18-1159 18-1155 120/140 1967-69 2062141 - 2791956 18-1158 — — 18-1157 18-1159 18-1155 120/140 1970-77 2791957 - 4893634 18-1158 — — 18-1157 18-1159 18-1155 120/140 1978-82 4893635 - 6225576 18-1158 18-1150 — 18-1157 18-1159 18-1155 470 1976-77 4208730 - 4893934 18-1158 — — 18-1157 18-1159 18-1155 470/485 1978-82 4893835 - 6225576 18-1158 18-1150 — 18-1157 18-1159 18-1155 160 1967-69 2065190 - 2763441 18-1158 — — 18-1157 18-1159 18-1155 165 1970-77 2763442 - 4890459 18-1158 — — 18-1157 18-1159 18-1155 165 1978-81 4890460 - UP 18-1158 18-1150 — 18-1157 18-1159 18-1155 888 1971-77 3106717 - UP 18-1158 — — 18-1157 18-1159 18-1155 225/233 1974-77 3856268 - UP 18-1158 — — 18-1157 18-1159 18-1155 898/228 1977 4782330 - 4898729 18-1158 — — 18-1157 18-1159 18-1155 898/228 1978-82 4898730 - 6225576 18-1158 18-1150 — 18-1157 18-1159 18-1155 250 1977 4791300 - 4898729 18-1158 — — 18-1157 18-1159 18-1155 255-TRS 1973-74 3377316 - 4203749 18-1158 — — — 18-1159 N/A 260 1978-82 4898730 - 6225576 18-1158 18-1150 — 18-1157 18-1159 18-1155 280-TRS 1975-76 4203750 - 4895399 18-1158 — — — 18-1159 N/A R 1983 6225577 - UP 18-1158 18-1150 — 18-1157 18-1159 18-1155 MR / Alpha One 1984-90 6225577 - UP 18-1158 18-1117 18-1143 — 18-1159 ➄ 18-1155 MR / Alpha One 1984-90 6225577 - UP 18-1158 18-1117 18-1143 18-1157 ➁ 18-1159 ➄ 18-1155 MR / Alpha One (CR) 1984-90 6225577 - UP 18-1158 18-1117 18-1143 — — — Alpha One SS 1986-89 A545004 - UP 18-1158 18-1117 18-1143 18-1157 18-1159 18-1155 Alpha One Gen II 1991-95 D469859 - F679999 18-1158 18-1117 18-1143 18-1157 18-1159 ➄ 18-1155 Alpha One Gen II (CR) 1991-95 D469859 - F679999 18-1158 18-1117 18-1143 — — — Alpha One Gen II 1996-97 F680000 - K999999 18-1158 18-1117 18-1143 18-1157 18-1156 18-1155 Alpha One Gen II (CR) 1996-97 F680000 - K999999 18-1158 18-1117 18-1143 — — — Alpha One Gen II 1998-newer L100040 - UP 18-1158 18-1117 18-1143 18-1157 18-1156 ➂ 18-1155 Alpha One Gen II (CR) 1998-newer L100040 - UP 18-1158 18-1117 18-1143 — — II 1962-67 1474909 - 2275488 — — — N/A 18-1156 ➂ N/A II 1968-69 2398798 - 2671321 — — — — 18-1162 18-1156 ➂ II-TR 1973-76 3377316 - 4794899 — — 18-1161 ➀ — — N/A TR 1973-93 4794900 - UP — — 18-1161 ➀ — — N/A TRS 1973-93 4794900 - UP 18-1158 — — — 18-1159 N/A MERCRUISER STERNDRIVE LOWER GEAR HOUSING BEARINGS (Cont.) ➀ 18-1161 Top Bearing / 18-1163 Bottom Bearing ➁ Torrington#B1616 ➂ Prop Shaft Drive Gear ➃ #15520 Stamped on Cup ➄ Use 18-1173 for 2.40:1 ratio only (new style lower gears) our 18-2206-1 18-2244 18-22441-9 ➀ (PKG. OF 50 WITHOUT GASKET) DRAIN PLUG Replaces: 10-79953A2, 10-79953, 10-79953Q04, 10-28634, 10-28634A1, 10-20259, 816610A1, 816610A2, F40109, 10-F50109 For: #1/R/MR/Alpha/Alpha I Gen II Both Upper And Lower Units 18-2375 18-23751-9 ➀ (PKG. OF 50 WITHOUT GASKET) DRAIN PLUG MAGNET Replaces: 10-14834, 10-14834A1, 22-67892, 22-67892A1, 22-67892A05, 22-67892A06, 22-8M0058389 (Magnet) For: Alpha MR/Gen II lower units Not to be used on #1/R lower units 18-2349 SHIFT SHAFT SLEEVE Replaces: 23-67370 ➁ 18-2375D 18-2460 PLUG KIT Replaces: 22-88847A1, 11-88462 Fits: Mercruiser Stern Drives 18-4220 THRUST WASHER Replaces: 13171, 77987 V-6, Outboards & Mercruiser Sterndrives 18-3784 THRUST WASHER Replaces: 805100 Fits: Bravo III (Front) 18-72005 NUT ANDWASHER KIT Fits: Mercruiser R/MR/Alpha/Gen II Drives ➀ 18-4220D