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Thread: WTB: Early I6 Merc LU case
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01-13-2020, 02:58 PM #17000 RPM
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WTB: Early I6 Merc LU case
I’m looking for an early Merc I6 lower unit case, casting number 1623-5886. I really only need a good case w- a nice skeg and not the internals.
Thanks-Last edited by SCT; 01-13-2020 at 03:02 PM.
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01-14-2020, 05:20 PM #2
Mine is 1623-3912. Its off early 70's 80hp
Case is perfect. Complete.2005 APR FORMULA 2 ROOKIE OF THE YEAR
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01-14-2020, 07:14 PM #3Screaming And Flying!
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different case....1/2.3 gears....pin case....
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01-14-2020, 08:38 PM #4
It is 2:3 ratio. I didn't know if the older cases interchanged or not. I know the later 850xs and 1500xs would not interchange internal wise. There is the same casting lower on ebay right now that says it has 1:78 ratio.
Last edited by largecar91; 01-14-2020 at 09:51 PM.
2005 APR FORMULA 2 ROOKIE OF THE YEAR
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01-14-2020, 09:21 PM #57000 RPM
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LC, I believe all the 1350s (70-71) were 1.78:1 gear ratio??? Where the majority of the I6s after were 2:???? But not sure if the case casting were different.
Dave can you school me?
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01-14-2020, 09:27 PM #6Screaming And Flying!
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Being a 1980 case.... not sure.... but I think all 1/2.3 cases were pin type D/S..... the early 1.78 cases had different size /straight cut gears.....Been a long time.......SCT is looking for an early case..... How early? I may have........The early ones had small H2o pickups.... steel shafts.... blunt nose.... or a newer one with fine splines... and a Xs style long skeg????
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01-14-2020, 10:10 PM #7
1980 case?? This came off a friend of mines 1970 80 hp
2005 APR FORMULA 2 ROOKIE OF THE YEAR
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01-15-2020, 12:34 AM #8Screaming And Flying!
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SCT... if your looking for a 1.78 case I might have one......w/no guts.....have some whole cases....What is your application goning to be?
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01-15-2020, 12:39 AM #9Screaming And Flying!
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Large car .... sorry .......got the year wrong.......some 1970s might have 2/1 ratio.....but most merc lowers were 1/2.3 on 80s......I think they were different.... not sure. Its been a while......have to rattle in the shop and look..........
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06-11-2021, 11:21 AM #10New Member
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Hi - I am new to this forum and I know this thread is over a year old but am hopeful for a reply.
I am looking for a Mercury Lower Unit Model 1623-3912. Largecar91 - Do you still have one? Or anyone else?
Thanks
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06-13-2021, 01:39 PM #11Screaming And Flying!
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What do ya need 20 or 15 inch?
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06-14-2021, 07:39 AM #12New Member
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Not sure exactly what measurement you are referring to. If it's it front to back on the top side it is 20". Thanks
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07-12-2021, 12:51 PM #13New Member
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Update - I was able to get a used lower unit 1623-6658 from a guy in the Wisconsin Dells area. It was an upgrade from the 1623-3912 as it has a stainless steel drive shaft. The leading edge is also larger which caused the wake to flatten out.
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