OMC Parts Drawing *Cobra *Mercruiser *Alpha SEI Outdrives
- MerCruiser Alpha One water pump
MC-1 / R / MR / Alpha One year's 1966 to 1990 with serial numbers 2495186 - OD469858. Four cylinder, V6 / V8 GM Chevy out drives.
Updated May 15 2026
- GLM Marine after market water pumps include:
- Seal, gaskets, o rings and impeller.
- Years 1967 to 1990 MerCruiser models (up to Alpha One gen 1)
- GLM Marine recirculating engine water pumps.
Photo
Description / OEM #
Price
(USD)
Price (Canadian)
12110 Water pump kit
lower unit water pump kit
1970 – 1983, serial numbers 2763442 – 6854392
Parts:
12312 46 – 57234T1 Base
12410 46 – 96148T1 Housing
12510 32435-1 Wear Plate
12820 23 – 29804T Guide Tube
21330 25 – 30271 Slinger
31010 27 – 85608-1 Gasket
31020 27 – 858524 Gasket
31040 27 – 856704 Gasket
31170 (2) 12 – 19183-3 Gasket
81160 25 – 30613 O-ring
85140 26 – 45577-1 Oil seal
89840 47- 89984T4 Impeller
$44.95
$ 66.89
88010 Service kit has upper-lower seal kit and water pump repair parts
P/N 88010 Water pump kit complete rebuild, includes upper and lower unit seals and gaskets.
Years 1970 to 1983 with serial numbers 2763442 thru to 6854392
$146.89
$ 223.89
12120 Alpha 1
6854393 – OD 469858)
Parts:
12410 46 – 96148T1 Housing
12510 32435 -1 Wear Plate
12820 23- 29804T Guide Tube
21330 25- 30271 Slinger
31010 27- 85608-1 Gasket
31020 27- 858524 Gasket
31040 27- 856704 Gasket
31170 (2) 12 – 19183-3 Gasket
81160 25 – 30613 O-ring
85140 26 – 45577-1 Seal
89840 47- 89984T4 Impeller
$37.95
$ 63.89
88020 Upper-lower seal kit with water pump set to repair outdrive.
P/N 88020
Outdrive service, includes impeller and upper housing and lower gear case seal kit.
Years 1984 to 1990 serial numbers 6854393 thru to
OD 469858.
$167.89
$ 223.89
12130 Water pump kit for MC-1 outdrive.
P/N 12130
Parts for years 1966 to 1969 with serial numbers 2495186 to 2763441.
$64.89
$ 123.89
P/N 12280 Pump housing impeller service kit with the water pump housing. OEM 46 – 961 – 48T8 and 46 – 78400A2. Years 1966 to 1990. Serial numbers 2495186 to OD 469858.
Parts included:
12410 water pump housing
12510 32435 -1 Wear Plate
12820 23 – 29804T Guide Tube
12830 26 – 38970 Grommet
21330 25 – 30271 Slinger
31010, 31020, 31030, 31040 Gaskets
31170 (2) 12 – 19183-3 Gasket
81390, 81160, 82260, 82250 O-ring
85140 26 – 45577 -1 Seal
89840 47 – 89984 T4 Impeller
P/N 12280
4 and 6 cylinder OEM 46 -78400A2
650 65 HP 4 Cylinder 1963 – 1969 serial number 1542745 – 2803561
650 65 HP 4 Cylinder 1970 – 1972, serial number 2803562 to 2874263, 2997439 to 3293183
700 E/EL-2 70 HP 6 cylinder 1961, serial number 1503959 – 1566239
75 HP 4 cylinder 1984 – 1988 USA 6432901 Up
75 HP 4 cylinder 1984 – 1988 CAN 7208573 Up
800 80 HP 4 cylinder 1969 – 1972, serial number 2559001 – 3493912
80 HP 4 cylinder 1978 – 1983, USA
831999 – 6432900
80 HP 4 cylinder 1978 – 1983, CAN 7110998 – 7208572
850 SX 85 HP 4 Cylinder 1973 – 1977
90 HP 4 Cylinder 1978 – 1986 USA 4845301 up
90 HP 6 Cylinder 1978 – 1986 CAN 7111698 up
1000 SS (E) 100 HP 6 Cylinder years 1962 – 1965, 1968 and 1969
Various 105 to V200 hp. models
Please call with year and serial number.
$29.95
$ 59.89
12290 MerCruiser-seal kit without housing.
P/N 12290
Impeller service, without housing. (1966 – 1990, serial numbers 2495186 – OD 469858)
Parts included:
12510 32435-1 Wear Plate
12820 23 – 29804T Guide Tube
12830 26 – 38970 Grommet
21330 25 – 30271 Slinger
31010, 31020, 31030, 31040 Gaskets
31170 (2) 12 – 19183-3 Gasket
81390, 81160, 82260, 82250 O-ring
85140 26 – 45577-1 Seal
89840 47 – 89984T4 Impeller
$26.89
$ 35.89
39530 Gaskets and seals only kit.
P/N 39530
MerCruiser water pump housing gasket and seal, without housing. Years 1966 to 1990 with serial numbers 2495186 to OD469858.
$21.95
$ 21.89
MC-1/R/MR/Alpha One water pump impeller and parts
Photo
Description / OEM #
Price
(USD)
Price (Canadian)
P/N 89840 Impeller
P/N 89840
Impeller OEM 47 – 89984T4 for MC-1 / R / MR and Alpha One
Years 1966 to 1990 with serial numbers 2495186 – OD469858
$24.89
$ 24.89
P/N 11070 Impeller key
P/N 11070
Impeller key for MC-1 / R / MR / Alpha One.
Years 1966 to 1990 with serial numbers 2495186 to OD469858
$4.89
$4.89
12410 Pump housing
P/N 12410 Pump housing 46 – 96148T1
$54.89
$54.89
12310 Pump base
P/N 12310
Pump base 46 – 57234A1
$44.89
$44.89
12510 Wear plate
P/N 12510
Wear plate 32435 -1
$ 6.89
$ 6.89
81390 O ring
P/N 81390 O ring (5 units)
$4.89
$4.89
82260 O ring
82260
O ring 25 – 33145
$4.95
$4.89
82115 O-ring
P/N 82115
O-ring
25 – 21836
$4.89
$4.89
82150 O-ring
P/N 82150
O ring
25 – 35027
$4.95
$4.89
82210 O-ring
P/N 82210
O ring (5 units)
25 – 21836
$4.95
$4.89
Install instructions for V4, V6 and V8 engine complete water pump kit
Install instructions for V4, V6 and V8 engine complete water pump kit
- Slide water tube grommet into water pump housing.
- Install guide tube with grommet.
- Install gasket compound on small o ring into water pump housing and install impeller cup.
- Glue seal into groove on water pump housing, set aside.
- Clean gasket surface on gear case. Install gasket and impeller plate onto gear case.
- Install key and 0-ring onto drive shaft. Slide impeller down drive shaft with o ring groove facing down.
- Lightly lubricate impeller housing with soapy water. Do not install impeller dry use a wheel bearing grease.
- Slide impeller housing over impeller.
- Turning drive shaft in a clock wise direction push down on housing.
- Tighten bolts, grease drive shaft splines.
People who purchased the above also purchased the following:
Photo
Description / OEM #
Price
(USD)
Price (Canadian)
Johnson gasket compound 508235
P/N 508235 Gasket sealing compound – 4 FL. OZ (118 ml).
$22.95
$27.89
GLM Marine recirculating Mercruiser engine water pumps
- Stainless Steel Backing Plate
- Stainless banded ceramic seal seat
- Bi-Directional and Balanced
- Stainless steel seal cup and spring
- Machined Brass Impeller
- Epoxy Painted Pump Housing
15100 Chevy 4-6 inline water pump
P/N 15100
Chevrolet inline 4 cylinder water pump
OEM: 884727, 3854017
153 CID – 2.5 Liter
181 CID – 3.0 Liter
$96.95
$127.89
15201 Chevy V6-V8 Engine water pump
P/N 15201
Inline 6 Cylinder engines small block engine water pumps
OEM: 884727, 3854017
229 CID – 3.8 Liter
262 CID – 4.3 Liter
250 CID – 4.0 Liter
305 CID – 5.0 Liter
350 CID – 5.7 Liter
$127.89
$127.89
15301 Water circulating pump
P/N 15301
Chevrolet V8 big block engines
New style water pump OEM: 850454 with 409 CID
6.6 Liter 427 CID
6.9 Liter 454 CID
7.4 Liter 502 CID –
8.2 Liter
$156.95
$ 256.89