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Mercury Mariner Outboard Lower Unit Gearcase Seal

Lower Unit Gearcase Seal

Sealing the gear oil inside the gearcase, and keeping water from intruding into the gearcase are the two aims of all the shaft seals, O-rings, spaghetti seals and gaskets in a lower unit. When you check your gear oil as a part of regular inspection, if you find the oil to be milky, it means water has been introduced somewhere. A seal kit and fresh gear oil will put you back in the safe zone.

Need other parts? If you need parts not listed in the application guide, please see:

Model Model Notes Origin Serial No. Range Lower Unit Seal Kit
2.5 0A855097 & up 27-95220A 3
2.5 (4-Stroke) JPN 0R131842 & up
3 0A855097 & up 27-95220A 3
3.3 Non-shift 0D901217 & up 27-95220A 3
3.3 Shift 0D901217 & up 27-95220A 3
3.5 Water-cooled USA 6202173 & up Obsolete
3.5 (4-Stroke) JPN 0R131842 & up
3.6 Water-cooled USA 5404657 & up Obsolete
BEL 9252831 & up
CAN 7145388 & up
4 1-Cylinder USA 5595532 - 0A809600 26-77066A 1
AUS 8068065 & up
BEL 9258281 - 9477829
CAN 7143688 & up
4 1-Cylinder USA 0A855097 - 0G710612
BEL 9589154 - 0P016999
4 2-Cylinder USA 5589202 - 5595531 Obsolete
AUS 8065265 - 8068064
BEL 9256981 - 9258280
CAN 7146488 - 7143687
4 (4-Stroke) JPN 0R000001 & up
BEL 0P073456 & up
4.5 1-Cylinder USA 4107220 - 0A809600 26-77066A 1
AUS 8026540 & up
BEL 9072179 - 9477829
CAN 7045758 & up
5 1-Cylinder USA 0A855097 & up
BEL 9589154 & up
5 (4-Stroke) JPN 0R000001 & up
BEL 0P073456 & up
6 USA 0A197112 - 0T800749 26-41365A 3
BEL 9461526 & up
6 (4-Stroke) JPN 0R000001 & up
BEL 0P073456 & up
7.5 (7.5, 75) USA 4851693 - 0A197111 26-77066A 1
AUS 8051350 & up
BEL 9181726 - 9461525
CAN 7111898 & up
8 USA 0A197112 & up 26-41365A 3
BEL 9461526 & up
8 (4-Stroke) USA 0H000058 - 0H017349 26-41365A 3
8 (4-Stroke) USA 0G760300 - 0T178499 26-41365A 3
BEL 0P086824 - 0P325499
8 (4-Stroke) JPN 0R042475 & up
BEL 0P325500 & up
9.8 (9.8, 110) USA 4839254 - 0A197111 26-77066A 1
AUS 8050625 & up
BEL 9165303 - 9461525
CAN 7111348 & up
9.9 USA 0A197112 & up 26-41365A 3
BEL 9461526 & up
9.9 (4-Stroke) USA 0H000058 - 0H017349 26-41365A 3
9.9 (4-Stroke) (Standard gearcase) USA 0G760300 - 0T979999 26-41365A 3
9.9 (4-Stroke) (Bigfoot gearcase) USA 0G760300 - 0T979999 26-85090A 2
BEL 0P075166 - 0P325499
9.9 (4-Stroke) (Standard gearcase) JPN 0R042475 & up
BEL 0P325500 & up
9.9 (4-Stroke) (Bigfoot gearcase) JPN 0R042475 & up
BEL 0P325500 & up
10 (XR 10 / Sea Pro 10) USA 0D038000 & up 26-41365A 3
BEL 9596000 & up
10 Magnum / Marathon USA 0D038000 & up 26-41365A 3
BEL 9596000 & up
15 (15, 15 Sea Pro / Marathon) USA 0B292414 & up 26-41365A 3
BEL 9542620 & up
15 (15XD Sea Pro / Marathon) BEL 9927000 & up 26-85090A 2
15 Super 15 USA 0B238464 & up 26-85090A 2
BEL 9507381 & up
CAN 0A730007 & up
15 (4-Stroke) (Standard gearcase) 323 cc USA 0G590000 & up 26-41365A 3
BEL 0P075166 & up
15 (4-Stroke) (Bigfoot gearcase) 323 cc USA 0G590000 & up 26-85090A 2
BEL 0P075166 & up
15 (4-Stroke) 351 cc JPN 0R235949 & up
18 USA 5837437 - 6443972 Obsolete
8071973 & up
BEL 9308306 - 9415100
CAN 7173723 - 7209532
18 (18XD) USA 6443973 & up 26-85090A 2
BEL 9378151 & up
CAN 7209533 & up
20 (20, 200) USA 4709593 - 6443972 26-66303A 1
AUS 8045199 & up
BEL 9157230 - 9415100
CAN 7098523 - 7209532
20 (20, 20XD) USA 6443973 - 0T800749 26-85090A 2
BEL 9415101 & up
CAN 7209533 & up
20 (4-Stroke) JPN 0R235168 & up
25 USA 5705532 - 6443972 Obsolete
8073158 & up
BEL 9315316 - 9415100
CAN 7166928 - 7209532
25 (25, 25XD) (25, 25XD) USA 6416713 & up 26-85090A 2
BEL 9378116 & up
CAN 7207858 & up
25 3-Cylinder Lightning USA 0E268781 & up 26-85090A 2
25 (4-Stroke) USA 0G590000 - 0T408999
BEL 9973100 - 0P153499
25 (4-Stroke) Carb models USA 0T409000 - 1B226999
BEL 0P153500 - 0P400999
25 (4-Stroke) EFI models JPN 0R106999 & up
BEL 0P401000 & up
30 2-Cylinder USA 0G053314 - 0T800759
BEL 9854537 - 0P267999
30 430 cc Lightning USA 0G575500 & up
30 (4-Stroke) 3-Cylinder (Standard gearcase) USA 0G760300 - 0T408999
BEL 0P094500 - 0P153499
30 (4-Stroke) 3-Cylinder (Standard gearcase) USA 0T409000 - 1B226999
BEL 0P153500 - 0P400999
30 (4-Stroke) 3-Cylinder (Bigfoot gearcase) USA 0G760300 - 0T408999 26-43035A 4
BEL 0P094500 - 0P153499
30 (4-Stroke) 3-Cylinder (Bigfoot gearcase) USA 0T409000 - 1B226999
BEL 0P153500 - 0P400999
30 (4-Stroke) EFI models JPN 0R106999 & up
BEL 0P401000 & up
35 2-Cylinder USA 6445653 & up 26-79831A 1
BEL 9384476 & up
CAN 7209608 & up
40 2-Cylinder USA 4860103 - 6445652 26-79831A 1
AUS 8052125 & up
BEL 9184451 - 9415100
CAN 7112423 - 7209608
40 2-Cylinder USA 0G053314 - 0T800749
BEL 9854537 - 0P267999
40 3-Cylinder USA 0G531301 & up
BEL 9973100 & up
40 4-Cylinder USA 0C159200 - 0G589999 26-79831A 1
BEL 9570790 - 9973099
40 (4-Stroke) 3-Cylinder (Standard gearcase) USA 0G760300 - 0T408999
BEL 0P094500 - 0P153499
40 (4-Stroke) 3-Cylinder (Standard gearcase) USA 0T409000 - 1B226999
BEL 0P153500 - 0P400999
40 (4-Stroke) 3-Cylinder (Bigfoot gearcase) USA 0G760300 - 0T408999 26-43035A 4
BEL 0P094500 - 0P153499
40 (4-Stroke) 3-Cylinder (Short shaft) USA 1B227000 - 1B344398
BEL 0P153500 - 0P515896
CHN 1C000001 - 1C049738
40 (4-Stroke) 3-Cylinder (Long shaft) CHN 1C000001 - 1C049738 26-814669A 2
BEL 0P401000 - 0P515896
40 (4-Stroke) 3-Cylinder CHN 1C049739 & up 26-814669A 2
40 (4-Stroke) 4-Cylinder Carb (Standard gearcase) Vertical shift USA 0G231123 - 0T598999
BEL 9944807 - 0P106999
40 (4-Stroke) 4-Cylinder Carb (Standard gearcase) Rotary shift USA 0T178500 - 0T598999 26-814669A 2
BEL 0P094500 - 0P206999
40 (4-Stroke) 4-Cylinder Carb (Bigfoot gearcase) USA 0G231123 - 0T598999 26-43035A 4
BEL 9944807 - 0P206999
40 (4-Stroke) 4-Cylinder EFI (Standard gearcase) USA 0T409000 - 1B344306 26-814669A 2
BEL 0P153500 & up
CHN 1C000001 & up
40 (4-Stroke) 4-Cylinder EFI (Bigfoot gearcase) USA 0T409000 - 1B344306
BEL 0P153500 & up
CHN 1C000001 - 1C033810
40 (4-Stroke) 4-Cylinder EFI (Bigfoot gearcase) CHN 1C033811 - 1C050251 26-43035A 4
40 (4-Stroke) 4-Cylinder EFI (Bigfoot gearcase) CHN 1C050252 & up
45 4-Cylinder USA 5531630 & up 26-79831A 1
AUS 8063985 & up
BEL 9248006 & up
CAN 7143688 & up
45 (4-Stroke) 4-Cylinder (Standard gearcase) USA 0G231123 - 0T178499
BEL 9944807 - 0P094499
45 (4-Stroke) 4-Cylinder (Bigfoot gearcase) USA 0G231123 - 0T178499 26-43035A 4
BEL 9944807 - 0P094499
50 4-Cylinder USA 4357640 & up 26-79831A 1
CAN 7068998 & up
AUS 8030090 & up
BEL 9107214 & up
50 3-Cylinder USA 6428681 - 0D000749 26-79831A 1
BEL 9385911 - 9683054
CAN 7208333 & up
50 3-Cylinder USA 0D000750 - 0G589999 26-814669A 2
BEL 9683055 - 9973099
50 3-Cylinder USA 0G590000 & up
BEL 9973100 & up
50 (4-Stroke) 4-Cylinder Carb (Standard gearcase) USA 0G231123 - 0T178499
BEL 9944807 - 0P016999
50 (4-Stroke) 4-Cylinder Carb (Standard gearcase) USA 0T178500 - 0T598999 26-814669A 2
BEL 0P094500 - 0P206999
50 (4-Stroke) 4-Cylinder Carb (Bigfoot gearcase) USA 0G231123 - 0T598999 26-43035A 4
BEL 9944807 - 0P206999
50 (4-Stroke) 4-Cylinder EFI (Standard gearcase) USA 0T409000 - 1B344306 26-814669A 2
BEL 0P153500 & up
CHN 1C000001 & up
50 (4-Stroke) 4-Cylinder EFI (Bigfoot gearcase) USA 0T409000 - 1B344306
BEL 0P153500 - 0P400999
BEL 0P515897 & up
CHN 1C000001 - 1C033810
CHN 1C050252 & up
50 (4-Stroke) 4-Cylinder EFI (Bigfoot gearcase) CHN 1C033811 - 1C050251 26-43035A 4
55 3-Cylinder USA 0D000750 & up 26-814669A 2
BEL 9683055 & up
60 3-Cylinder USA 6428681 - 0D000749 26-79831A 1
BEL 9385911 - 9683054
CAN 7208333 & up
60 3-Cylinder (Standard gearcase) USA 0D000750 & up 26-814669A 2
BEL 9683055 & up
60 3-Cylinder (Bigfoot gearcase) USA 0D000750 & up 26-43035A 4
BEL 9683055 & up
60 (4-Stroke) 4-Cylinder Carb (Standard gearcase) USA 0T178500 - 0T598999 26-814669A 2
BEL 0P094500 - 0P206999
60 (4-Stroke) 4-Cylinder Carb (Bigfoot gearcase) USA 0T178500 - 0T598999 26-43035A 4
BEL 0P094500 - 0P206999
60 (4-Stroke) 4-Cylinder EFI (Standard gearcase) USA 0T409000 - 1B344306 26-814669A 2
BEL 0P153500 & up
CHN 1C000001 & up
60 (4-Stroke) 4-Cylinder EFI (Bigfoot gearcase) USA 0T409000 - 1B344306
BEL 0P153500 - 0P400999
BEL 0P515897 & up
CHN 1C000001 - 1C033810
CHN 1C050252 & up
60 (4-Stroke) 4-Cylinder EFI (Bigfoot gearcase) CHN 1C033811 - 1C050251 26-43035A 4
70 3-Cylinder USA 4571652 - 0A996141 26-79831A 1
AUS 8042350 & up
BEL 9135825 - 9385910
CAN 7087823 - 7208332
70 3-Cylinder USA 0A996142 & up 26-43035A 4
BEL 9483121 & up
75 3-Cylinder USA 0C222000 & up 26-43035A 4
BEL 9589039 & up
75 Optimax 3-Cylinder USA 0T980000 & up 26-43035A 4
75 4-Cylinder USA 6432901 - 0B122929 26-55682A 1
BEL 9393856 - 9469199
CAN 7208573 - 0A721307
75 (4-Stroke) USA 0G960500 - 1B366822 26-43035A 4
BEL 0P094500 - 1B366822
80 4-Cylinder USA 4831999 - 6432900 26-55682A 1
AUS 8050200 & up
BEL 9177626 - 9393855
CAN 7110998 - 7208572
80 3-Cylinder USA 0A996142 - 0C221999 26-43035A 4
BEL 9483121 - 9589038
90 6-Cylinder USA 4845301 - 0A996141 26-55682A 1
CAN 7111698 & up
AUS 8060545 & up
90 3-Cylinder USA 0A996142 & up 26-43035A 4
BEL 9483121 & up
90 Optimax 3-Cylinder USA 0T980000 & up 26-43035A 4
90 (4-Stroke) USA 0G960500 - 1B366822 26-43035A 4
BEL 0P094500 - 1B366822
100 4-Cylinder USA 0B209468 - 0G960499 26-43035A 4
BEL 9523034 - 0P058999
115 6-Cylinder USA 4855153 & up 26-55682A 1
AUS 8051950 & up
CAN 7112248 & up
115 4-Cylinder USA 0C100000 & up 26-43035A 4
BEL 9559771 & up
115 Optimax 3-Cylinder USA 0T801000 & up 26-43035A 4
115 EFI USA 0T178500 - 1B366822 26-43035A 4
(4-Stroke)
125 4-Cylinder USA 0D283222 & up 26-43035A 4
BEL 9793577 & up
140 6-Cylinder (140, 1400) USA 4865678 & up 26-55682A 1
AUS 8052650 & up
CAN 7112773 & up
V-135 USA 0A904646 - 0C239552 26-89238A 2
V-135 USA 0C239553 & up 26-89238A 2
V-135 Optimax DFI USA 0G590000 & up 26-89238A 2
135 Verado USA 1B227000 & up 26-830749A01
V-150 (150, 1500) USA 4868998 - 0A904645 26-55682A 1
V-150 Carb USA 0A904646 & up 26-89238A 2
V-150 (XR4 / Magnum II) USA 0B242885 - 0C239552 26-89238A 2
V-150 (XR4) USA 0C239553 - 0D081999 26-89238A 2
V-150 (XR6 / Magnum III) USA 0D082000 & up 26-89238A 2
V-150 EFI USA 0D082000 & up 26-89238A 2
V-150 Optimax DFI USA 0G590000 & up 26-89238A 2
150 Verado USA 1B227000 & up 26-830749A01
V-175 (175, 1750) USA 4301235 - 6618750 26-55682A 1
V-175 (175, 1750) AUS 8058870 & up 26-55682A 1
V-175 Carb, EFI USA 6618751 & up 26-89238A 2
V-175 Optimax DFI USA 0T178500 & up 26-89238A 2
175 Verado USA 1B227000 & up 26-830749A01
V-200 (200, 2000) USA 4839034 - 6625220 26-55682A 1
V-200 (200, 2000) AUS 8061595 & up 26-55682A 1
V-200 (2.5L) Carb, EFI USA 6625221 & up 26-89238A 2
V-200 (3.0L) EFI USA 0T801000 & up 26-816575A 4
V-200 Optimax (3.0L) DFI (C-2 casting) USA 0G386496 - 0G437999 26-816575A 5
V-200 Optimax (3.0L) DFI (C-3 casting) USA 0G386496 - 0G437999 26-816575A 4
V-200 Optimax (3.0L) DFI USA 0G438000 - 1B504988 26-816575A 4
200 Verado 4- & 6-Cylinder USA 0T980000 & up 26-830749A01
V-220 USA 0B117316 - 0C100860 26-89238A 2
V-225 USA 5628028 - 6042945 26-55682A 1
V-225 (3.0L) (C-2 casting) USA 0D280813 - 0G437999 26-816575A 5
V-225 (3.0L) (C-3 casting) USA 0D280813 - 0G437999 26-816575A 4
V-225 (3.0L) USA 0G438000 & up 26-816575A 4
V-225 (3.0L) EFI (C-2 casting) USA 0G129222 - 0G437999 26-816575A 5
V-225 (3.0L) EFI (C-3 casting) USA 0G129222 - 0G437999 26-816575A 4
V-225 (3.0L) EFI USA 0G438000 - 1B504988 26-816575A 4
V-225 Optimax (3.0L) DFI USA 0G590000 - 1B504988 26-816575A 4
V-225 (4-Stroke) USA 0T653945 - 0T800999
V-225 (4-Stroke) USA 0T801000 & up
225 Verado USA 0T980000 & up 26-830749A01
V-250 (3.0L) EFI (C-2 casting) USA 0G129222 - 0G437999 26-816575A 5
V-250 (3.0L) EFI (C-3 casting) USA 0G129222 - 0G437999 26-816575A 4
V-250 (3.0L) EFI USA 0G438000 - 1B504988 26-816575A 4
250 Verado USA 0T980000 & up 26-830749A01
275 Verado USA 0T980000 & up 26-830749A01
300 Verado USA 1B517434 & up 26-830749A01