MerCruiser Sterndrive 1983-1990
- Number 6
- R
- MR
- Alpha One
- SS
Number 6, Sterndrive Units R-MR-Alpha One & Alpha One SS, MC 120R/140B/185R/488R/898R/228R/260R
Serial Numbers - 6216687 thru 6849289, MC 120MR/140MR/170MR/185MR/190MR/200MR/230MR/260MR/300 Tempest MR
Serial Number - 6849290 thru 0A471374, MC Alpha One/Alpha One SS Serial Numbers 0A471375 and Above / from OA483878 to OF800000.
Years: 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990
The 1983-1990 MerCruiser R MR Alpha One, SS Sterndrive service manual is an essential resource for mechanics, technicians, and owners as it provides in-depth information on maintenance, troubleshooting, repair, and servicing procedures for the specified equipment. Whether it's engine maintenance, electrical system troubleshooting, or gear housing repair, this manual offers detailed instructions and diagrams to assist in every aspect of servicing the MerCruiser R MR Alpha One, SS Sterndrive.
**1983** > - R > - MR > - Alpha One > - Alpha One SS **1984** > - R > - MR > - Alpha One > - Alpha One SS **1985** > - R > - MR > - Alpha One > - Alpha One SS **1986** > - R > - MR > - Alpha One > - Alpha One SS **1987** > - R > - MR > - Alpha One > - Alpha One SS **1988** > - R > - MR > - Alpha One > - Alpha One SS **1989** > - R > - MR > - Alpha One > - Alpha One SS **1990** > - R > - MR > - Alpha One > - Alpha One SS - MC 120R / 140B / 185R / 488R / 898R / 228R / 260R --- 6216687 - 6849289 - MC 120MR / 140MR / 170MR / 185MR / 190MR / 200MR / 230MR / 260MR / 300 Tempest MR --- 6849290 - 0A471374 - MC Alpha One / Alpha One SS --- 0A471375 and Above MC 120R-260R - 1.98:1 - 1.94:1 - 6237861-6854392 - 1.84:1 - 1.81:1 - 6225577-6862701 - 1.65:1 - 1.62:1 - 6268065-6810537 - 1.50:1 - 1.47:1 - 6229158-6847029 - 1.32:1 - 1.29:1 - 6231571-6663947 MC 120 MR - 300 TEMPEST MR Original Ratio --- Ratio If Serviced With 13:28 Gears --- Serial Number - 1.98:1 - 1.94:1 - 6854393-0A476746 - 1.84:1 - 1.81:1 - 6862702-0A470164 - 1.65:1 - 1.62:1 - 6810538-0A475786 - 1.50:1 - 1.47:1 - 6847030-0A479506 MC ALPHA ONE / ALPHA ONE SS - 1.98:1 - 1.98:1 - 0A476747 and Above - 0C881740 and Above - 1.84:1 - 1.84:1 - 0A470165 and Above - 0C884040 and Above - 1.65:1 - 1.65:1 - 0A475787 and Above - 0C881790 and Above - 1.50:1 - 1.50:1 - 0A479507 and Above - 0C852908 and Above - 1.32:1 - 1.32:1 - 0A613927 and Above - Alpha One SS 1.50:1 / 1.32:1 - 1.50 / 1.32:1 - 0A545004 and Above - 1.98:1 - 0B803866-0C348031 - 1.84:1 - 0B800854-0C343526 - 1.50:1 - 0B796473-0C340666 - 1.32:1 - 0B804807-0C340030 - 3.0L - 3.0L Alpha One - 4.3L2 - 4.3L Alpha One - 4.3L4 - 4.3LX Alpha One - 5.7L - 5.7L Alpha One - SRX 5.7L - 350 Magnum Alpha One - SRX 7.4L - 454 Magnum Alpha One - Production/model years: 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990.
**Mercruiser Sterndrive Units** > - R > - MR > - Alpha One > - Alpha One SS > - Number 6 - MC 120R/140B/185R/488R/898R/228R/260R 6216687 to 6849289 - MC 120MR/140MR/170MR/185MR/190MR/200MR/230MR/260MR/300 Tempest MR 6849290 to 0A471374 - MC Alpha One/Alpha One SS 0A471375 and Above - R and MR (Serial numbers: 2763442 - 6225576) - Alpha One (Serial numbers: 0A502811 - 0D469858) - Alpha One Gen II (Serial numbers: 0D469859 and up) **Serial Numbers:** - R and MR: 2763442 - 6225576 - Alpha One: 0A502811 - 0D469858 - Alpha One Gen II: 0D469859 and up
**Number 11 Bravo** - > Bravo One Sterndrive Unit - S/N: B664190 and Above - > Bravo Two Sterndrive Unit - S/N: B892613 and Above - > Bravo Three Sterndrive Unit - S/N: D763691 and Above - > Bravo Transom Assembly (Standard) * - S/N: B673048 and Above - > Bravo Transom Assembly (High Performance) - S/N: D796083 and Above - > Bravo Transom Assembly (Magnum) - S/N: K104738 and Above Production/model years: 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998.
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