Mercruiser MC1 Lower Unit Part# 1623-5412

Cameron Williams

New Member
Nov 12, 2018
13
Boat Info
1971 SRV 190, Mercruiser 165
Engines
165 Mercruiser Inline Six
Hello all,
I am looking to purchase a used lower unit for my MC1 outdrive. I have found one and the seller has listed the part number as 1623-5412, a quick google search does not show much of anything that looks valid for this part number. Is anyone familiar with it and if so is it a correct part number for the MC1 outdrive? This will be going on a mercruiser 165, MC1.

Thank you,
 
Yes that number 1623-5412 would match up within Mercruisers part number listings to fit your 165, MC1.

As a starting point for many similar superseded numbers to say 1623-5356A4 which is a new lower unit gear housing case from Mercruiser; Eventually those numbers crossed paths with your number in question as noted below.

Manufacturer Part Number: 5356A 4,1623-5356A 4,4623-5412-51,4623-5412..., https://www.ebay.ca/itm/11338341425...6%26rvr_ts%3D72e730531670ab6b0702e65dffd5ada2

https://www.mercruiserparts.com/5356a4-gc-mc-i-basic
Where Used:
470 STERN DRIVE - 470 1976-1977 120/140/165 STERN DRIVE - 165 1970-1977
R/MR ALPHA ONE STERNDRIVE - R/MR/ALPHA ONE (Transom Assembly) 1983-1990 120/140/165 STERN DRIVE - 120/140 1970-1977
898 (1.50 RATIO) 1228 (1.50 RATIO) 1250 (1.32 RATIO) - 250 1977 225-S/233 (1.32 RATIO) STERN DRIVE - 233 1975-1977
R/MR ALPHA ONE STERNDRIVE - R/MR/ALPHA ONE (Sterndrive) 1983-1990 120/140 (1.98 RATIO) 165 (1.65 RATIO) 470/485 (1.84 RATIO) 260/898/228 (1.50 RATIO) - 228 1978-1982
898 (1.50 RATIO) 1228 (1.50 RATIO) 1250 (1.32 RATIO) - 898/228 1977 120/140 (1.98 RATIO) 165 (1.65 RATIO) 470/485 (1.84 RATIO) 260/898/228 (1.50 RATIO) - 470 1978-1982
120/140 (1.98 RATIO) 165 (1.65 RATIO) 470/485 (1.84 RATIO) 260/898/228 (1.50 RATIO) - 120/140 1978-1982 225-S/233 (1.32 RATIO) STERN DRIVE - 225-S 1974
888 STERN DRIVE (1.50) RATIO - 888 1971-1977 120/140 (1.98 RATIO) 165 (1.65 RATIO) 470/485 (1.84 RATIO) 260/898/228 (1.50 RATIO) - 485 1980-1982
120/140 (1.98 RATIO) 165 (1.65 RATIO) 470/485 (1.84 RATIO) 260/898/228 (1.50 RATIO) - 165 1978-1981 120/140 (1.98 RATIO) 165 (1.65 RATIO) 470/485 (1.84 RATIO) 260/898/228 (1.50 RATIO) - 898 1978-1982

https://www.ebay.ca/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=1623-5412&_sacat=0

Another option to consider if you wanted to go with new aftermarket with a good warranty at a fair cost would be check into sterndrive engineering...., https://www.sterndrive.cc/product/Fits-Mercruiser-Gen-I-Lower-8951A43.html

https://www.sterndrive.cc/Alpha-One-Gen-I.html
 
Wow!! Thank you for the wealth of information! I got it and she went right back together, thanks again.

Yes that number 1623-5412 would match up within Mercruisers part number listings to fit your 165, MC1.

As a starting point for many similar superseded numbers to say 1623-5356A4 which is a new lower unit gear housing case from Mercruiser; Eventually those numbers crossed paths with your number in question as noted below.

Manufacturer Part Number: 5356A 4,1623-5356A 4,4623-5412-51,4623-5412..., https://www.ebay.ca/itm/113383414255?ul_ref=https%3A%2F%2Frover.ebay.com%2Frover%2F1%2F706-53473-19255-0%2F1%3Fff3%3D2%26toolid%3D10001%26campid%3D5338313249%26customid%3Dboatpartsandsuppliesonlineherenow.com%2Bsingle%2B1623-5412%2B47.149.254.243%26item%3D113383414255%26vectorid%3D229529%26srcrot%3D706-53473-19255-0%26rvr_id%3D1766565197876%26rvr_ts%3D72e730531670ab6b0702e65dffd5ada2

https://www.mercruiserparts.com/5356a4-gc-mc-i-basic
Where Used:
470 STERN DRIVE - 470 1976-1977 120/140/165 STERN DRIVE - 165 1970-1977
R/MR ALPHA ONE STERNDRIVE - R/MR/ALPHA ONE (Transom Assembly) 1983-1990 120/140/165 STERN DRIVE - 120/140 1970-1977
898 (1.50 RATIO) 1228 (1.50 RATIO) 1250 (1.32 RATIO) - 250 1977 225-S/233 (1.32 RATIO) STERN DRIVE - 233 1975-1977
R/MR ALPHA ONE STERNDRIVE - R/MR/ALPHA ONE (Sterndrive) 1983-1990 120/140 (1.98 RATIO) 165 (1.65 RATIO) 470/485 (1.84 RATIO) 260/898/228 (1.50 RATIO) - 228 1978-1982
898 (1.50 RATIO) 1228 (1.50 RATIO) 1250 (1.32 RATIO) - 898/228 1977 120/140 (1.98 RATIO) 165 (1.65 RATIO) 470/485 (1.84 RATIO) 260/898/228 (1.50 RATIO) - 470 1978-1982
120/140 (1.98 RATIO) 165 (1.65 RATIO) 470/485 (1.84 RATIO) 260/898/228 (1.50 RATIO) - 120/140 1978-1982 225-S/233 (1.32 RATIO) STERN DRIVE - 225-S 1974
888 STERN DRIVE (1.50) RATIO - 888 1971-1977 120/140 (1.98 RATIO) 165 (1.65 RATIO) 470/485 (1.84 RATIO) 260/898/228 (1.50 RATIO) - 485 1980-1982
120/140 (1.98 RATIO) 165 (1.65 RATIO) 470/485 (1.84 RATIO) 260/898/228 (1.50 RATIO) - 165 1978-1981 120/140 (1.98 RATIO) 165 (1.65 RATIO) 470/485 (1.84 RATIO) 260/898/228 (1.50 RATIO) - 898 1978-1982

https://www.ebay.ca/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=1623-5412&_sacat=0

Another option to consider if you wanted to go with new aftermarket with a good warranty at a fair cost would be check into sterndrive engineering...., https://www.sterndrive.cc/product/Fits-Mercruiser-Gen-I-Lower-8951A43.html

https://www.sterndrive.cc/Alpha-One-Gen-I.html
 

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