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lower unit interchangable--chart?

M

Mike46

New member
Does anyone have a chart for interchangeable lower units? Does motor s# give the answer? Mercury 200 EFI 1998 Serial# 0G725287
 
Last edited:
There is no chart that I am aware of - have to check part numbers of potential donor against your particular model.

The "serial" number is not a serial number at all, just a production number. The next motor off the line got the next number up. Unlike Yami or OMC/BRP there is "zero" data encoded in a Merc number - no year, no model, no horsepower - nada..

For your model, some 150's plus all the 175/200/225 horse models built between 1995 and 2002 (or 3 maybe) shared a lower unit/gear case - so 175 and 200, 150 XR6, 150 XRI, 175 XRI, 200 XRI, 200 and 225 Promax and Super Magnums should all fit.

Additionally, the case off of similar year 135/150's will fit but the gears are different (2.00:1 vice 1.87:1) - so they would work but you would require a different prop (the lower gears can handle more pitch).
 
You need a 1:87:1 gear ratio for a 200 and the serial number will give you information such as country and year manufactured.... also here is a chart that tells all you need on gear ratios,models,rpm and displacement. Any 1:87:1 ratio from 1987-2005 will interchange from a 2.4 or 2.5 motor...


[SIZE=-1]Mercury[/SIZE] [SIZE=-1]2.0L[/SIZE] [SIZE=-1]150[/SIZE] [SIZE=-1]5000-5600[/SIZE] [SIZE=-1]2.00/1[/SIZE]
[SIZE=-1]Mercury[/SIZE] [SIZE=-1]2.5L/2.5L EFI[/SIZE] [SIZE=-1]150/175[/SIZE] [SIZE=-1]5000-5600[/SIZE] [SIZE=-1]1.87/1[/SIZE]
[SIZE=-1]Mercury[/SIZE] [SIZE=-1]('99) 2.5L[/SIZE] [SIZE=-1]200[/SIZE] [SIZE=-1]5000-5600[/SIZE] [SIZE=-1]1.87/1[/SIZE]
[SIZE=-1]Mercury[/SIZE] [SIZE=-1]2.5L EFI[/SIZE] [SIZE=-1]200[/SIZE] [SIZE=-1]5000-5800[/SIZE] [SIZE=-1]1.87/1[/SIZE]
[SIZE=-1]Mercury[/SIZE] [SIZE=-1]3.0L[/SIZE] [SIZE=-1]225[/SIZE] [SIZE=-1]5000-5500[/SIZE] [SIZE=-1]1.75/1[/SIZE]
[SIZE=-1]Mercury[/SIZE] [SIZE=-1]3.0L EFI[/SIZE] [SIZE=-1]225[/SIZE] [SIZE=-1]5000-5800[/SIZE] [SIZE=-1]1.75/1[/SIZE]
[SIZE=-1]Mercury[/SIZE] [SIZE=-1]XB 3.0L EFI[/SIZE] [SIZE=-1]250[/SIZE] [SIZE=-1]5800-6100 (6250)[/SIZE] [SIZE=-1]1.75/1[/SIZE]
[SIZE=-1]Mercury[/SIZE] [SIZE=-1]Optimax 2.5L[/SIZE] [SIZE=-1]150[/SIZE] [SIZE=-1]5000-5600[/SIZE] [SIZE=-1]1.87/1[/SIZE]
[SIZE=-1]Mercury[/SIZE] [SIZE=-1]Optimax 3.0L[/SIZE] [SIZE=-1]200/225[/SIZE] [SIZE=-1]5000-5750[/SIZE] [SIZE=-1]1.75/1[/SIZE]
[SIZE=-1]Mercury Hi-P[/SIZE] [SIZE=-1]2.5L EFI[/SIZE] [SIZE=-1]260[/SIZE] [SIZE=-1]7500[/SIZE] [SIZE=-1]1.87/1 (SM)[/SIZE]
[SIZE=-1]Mercury Hi-P[/SIZE] [SIZE=-1]2.5L EFI[/SIZE] [SIZE=-1]280[/SIZE] [SIZE=-1]8000[/SIZE] [SIZE=-1]1.87/1 (SM)[/SIZE]
[SIZE=-1]Mercury Hi-P[/SIZE] [SIZE=-1]('01) 2.5L EFI[/SIZE] [SIZE=-1]Sport[/SIZE]/[SIZE=-1]SS/Offshore [/SIZE] [SIZE=-1]280[/SIZE] [SIZE=-1]7200-7500[/SIZE] [SIZE=-1]1.87/1 (SM)/SS 15"[/SIZE]
[SIZE=-1]Mercury Hi-P[/SIZE] [SIZE=-1]Pro Max[/SIZE] [SIZE=-1]150[/SIZE] [SIZE=-1]6500[/SIZE] [SIZE=-1]1.78/1 (XR)[/SIZE]
[SIZE=-1]1.87/1 (SM)[/SIZE]
[SIZE=-1]2.00/1 (TM)[/SIZE]
[SIZE=-1]Mercury Hi-P[/SIZE] [SIZE=-1]Optimax XS[/SIZE] [SIZE=-1]200[/SIZE] [SIZE=-1]6000-6500[/SIZE] [SIZE=-1]1.87/1 (TM/SM 20")[/SIZE]
[SIZE=-1]1.87/1 (SM 15")[/SIZE]
[SIZE=-1]Mercury Hi-P[/SIZE] [SIZE=-1]Pro Max 2.5L[/SIZE] [SIZE=-1]200/225[/SIZE] [SIZE=-1]6500 (6750)[/SIZE] [SIZE=-1]1.87/1 (SM/TM)[/SIZE]
[SIZE=-1]Mercury Hi-P[/SIZE] [SIZE=-1]Pro Max 300 (3.0L)[/SIZE] [SIZE=-1]300[/SIZE] [SIZE=-1]6100 (6300)[/SIZE] [SIZE=-1]1.62/1 (SM)[/SIZE]
[SIZE=-1]1.75/1 (TM/FM)[/SIZE]
[SIZE=-1]Mercury Hi-P[/SIZE] [SIZE=-1]('01) Pro Max[/SIZE] [SIZE=-1]300X (3.0L)[/SIZE] [SIZE=-1]300[/SIZE]+ [SIZE=-1]6100-6800[/SIZE] [SIZE=-1]1.62/1 (SM)[/SIZE]
[SIZE=-1]1.75/1 (TM/FM)[/SIZE]
[SIZE=-1]Mercury Hi-P[/SIZE] [SIZE=-1]2.5L Drag SS[/SIZE] [SIZE=-1]300[/SIZE] [SIZE=-1]9000[/SIZE] [SIZE=-1]1.87/1 (SM 15")[/SIZE]
 
Thanks, this helps a great deal. I found a friend with a brother in-law who has 2 lower units. Just wasn't sure about what I could and should be looking at/for. Great forum and glad I joined.. Thanks again Fazbullet for chart and info, thanks galamb for info aslo..
 
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