OMC Parts Drawing *Cobra *Mercruiser *Alpha SEI Outdrives

OMC Cobra Water Pump Service Kit

OMC Cobra Outdrive Water Pump Impeller Kit for 4 Cylinder, V6 and V8 Models

Last updated on 11/12/2023

  • GLM 12092 replaces the Sierra kit 18-3212 *Note OEM not available.
  • Kit includes housing and mounting gasket.
  • Compatible with 1986 – 1993 models, 4 cylinder, 6 cylinder and V8.
  • Water pump removal and installation video.
  • Does not work with SX or Cone Clutch models
OMC Cobra Water Pump Service Kit, Water Pump OMC Cobra Impeller

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OMC Cobra Water Pump Service Kit, Water Pump OMC Cobra Impeller

GLM 12092 replaces Sierra 18-3212

$50.95 US

$54.89 CDN

12091 Water pump service kit OEM 984461

GLM 12091 replaces OMC 984461 compatible with 1986 to 1993 models. 4 cylinder, 6 cylinder and V8 does not work with SX or cone clutch models

12091 Water pump service kit

$57.89 CDN

12091 Water pump service kit

$57.89 US

12405 OMC Cobra pump housing

12405 Housing 984744

# 12405
$25.95 US

# 12405
$42.89 CDN

Impeller

GLM 89950 OMC Cobra impeller

# 89950 
$15.95 US

# 89950 
$25.89 CDN

34771 OMC Cobra water pump gasket

34771 OMC Cobra water pump gasket

# 34771
  $  .95 US

# 34771
$4.89 CDN

12391 Cobra water pump liner

12391 Cup lining 911844

# 12391 
$14.95 us

# 12391 
$20.89 cdn

86630 Cobra water pump seal 911704

86630 Cobra water pump seal 911704

# 86630 
$  .95 us

# 86630
$9.89 cdn

27900 Cobra water pump adaptor

27900 Cobra water pump adaptor

# 27900 
$  .95 us

# 27900
$128.89 cdn

82430 Water pump adaptor large o ring

# 82430 
$  .95 us

# 82430
$4.89 cdn

22385 Water pump case screw 3 inch x 5/16

22385 Water pump case screw 3 inch x 5/16

# 22385 
$  .95 us

# 22385
$23.89 cdn

47010 Cobra water pump case vent tube

47010 Cobra water pump case vent tube

# 47010 
$  .95 us

# 47010
$21.89 cdn

86620 Cobra water tube seal

86620 Water pump adaptor oil seal

# 86610 
$  .95 us

# 86610
$16.89 cdn

81280 Water pump adaptor small o ring

# 81280 
$  .95 us

# 81280
$ 4.89 cdn

508235 Evinrude/Johnson gasket sealing compound

508235 Evinrude Johnson gasket sealing compound.

# 508235
$  .95 us

# 508235
$ 4.89 cdn

OMC Cobra water pump removal and installation video

Trouble shooting your Cobra water pump when
there is very little or no water flow

  1. Make sure that you have lower unit ears are attached in a proper mater and adequate water pressure supply is available to pump.
  2. If testing from a trailer be sure water level is deep enough so as to stop air from enter pump unit.
  3. With engine running at 550-600 rpm check water tube coming from transom assembly there should be steady flow of water that should fill a 2-gallon pail of water in about 2 to 3 minutes
    See your OMC repair manual for exact rpm and fill times.
  4. If there is an inadequate water from the water pump check out the installation video above to make certain that air is not entering the impeller area due to no gasket compound or a cracked water pump housing case or broken o ring type gasket that goes round the water pump case.
  5. If the above test is done the next check would involve removing the upper gearcase from the lower unit and checking the following items
  6. Check to make sure the copper tube was installed and that both ends have seal installed with 680 Loctite on the top gearcase and Loctite gasket compound on the lower unit water passage housing part of the copper tube.
  7. The next step would be to check to see if gasket compound was installed on the o ring between the bearing housing and the water passage housing.
  8. Look to see if gasket area of water passage is corroded or if OEM 915719 gasket material is broken and allowing exhaust fumes to enter water pump pick up area. 

Trouble shooting your water pump when there is water flow but engine is over heating

  1. Once water flow has been established check to see if exhaust fume backpressure is coming from the following.
  2. Chech both manifold and exhaust gaskets that can be just rusted out.
  3. The next check would be to the manifold where there can be crack from water left in the winter
  4. Manifolds can also leak internally over time say 5 to 10 year  term would be normal
  5. When you have this type of manifold or elbow leak at the beginning the engine temperature will be fine at idol speed of 550 to 600 but will heat up at higher speeds as the exhaust fume pressure builds up. In some cases, it can reach the impeller area and melts down the water pump case.