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OMC Thermostats, Housings & Parts by Sierra

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Products: 1 - 13 of 13
Circulating Water Pump 2.3L OMC, 984876, 18-3578

Circulating Water Pump 2.3L OMC, 984876, 18-3578

Mfr. Sierra | Mfr No. 18-3578

Circulating Water Pump 2.3L OMC, 984876, 18-3578. Water Circulation Pump. Used on 2.3L 1987-1990...
$194.20

OMC Sterndrive / Cobra Thermostat Kit, 18-3676

OMC Sterndrive / Cobra Thermostat Kit, 18-3676

Mfr. Sierra | Mfr No. 18-3676

OMC Sterndrive / Cobra Thermostat Kit, 18-3676 for 7.4L (1994-98), 8.2L (1998)...
$20.48

Temperature Sender - 18-5897

Temperature Sender - 18-5897

Mfr. Sierra | Mfr No. 18-5897

Temperature Sender - 18-5897. Replacement part for Mercruiser Inboard/Outboard #97257A1 and Sterndrive/Cobra Inboard/Outboard #980613...
$18.41

Temperature Sender - 18-5898

Temperature Sender - 18-5898

Mfr. Sierra | Mfr No. 18-5898

Temperature Sender - 18-5898 for Crusader, Mercruiser and Sterndrive/Cobra Inboard/Outboards...
$13.07

Thermostat Housing 4 & 6 Cylinder Gasket, 149876

Thermostat Housing 4 & 6 Cylinder Gasket, 149876

Mfr. Sierra

Thermostat Housing 4 & 6 Cylinder Gasket, 149876. Replaces: Mercury/Mariner Outboard #27-814680...
$1.51 - $3.85

Thermostat Housing Gasket, OMC 305586, 18-2895

Thermostat Housing Gasket, OMC 305586, 18-2895

Mfr. Sierra | Mfr No. 18-2895

Thermostat Housing Gasket, OMC 305586, 18-2895...
$1.13

Thermostat Kit, Sterndrive/Cobra, 18-3670

Thermostat Kit, Sterndrive/Cobra, 18-3670

Mfr. Sierra | Mfr No. 18-3670

Thermostat Kit, Sterndrive/Cobra, 18-3670. For use on Sterndrive/Cobra Inboard/Outboard cooling systems...
$15.52

Thermostat Kit OMC - 18-3653

Thermostat Kit OMC - 18-3653

Mfr. Sierra | Mfr No. 18-3653

Thermostat Kit OMC - 18-3653. For use on Sterndrive/Cobra Inboard/Outboard cooling systems...
$16.67

Thermostat, 160, OMC Sterndrive/Cobra, 18-3554

Thermostat, 160°, OMC Sterndrive/Cobra, 18-3554

Mfr. Sierra | Mfr No. 18-3554

Thermostat, 160°, OMC Sterndrive/Cobra, 18-3554. Replacement for Sterndrive/Cobra Inboard/Outboard #383307...
$14.72

Thermostat, 160, Sterndrive/Cobra, 18-3558

Thermostat, 160°, Sterndrive/Cobra, 18-3558

Mfr. Sierra | Mfr No. 18-3558

Thermostat, 160°, Sterndrive/Cobra, 18-3558. Replacement for Sterndrive/Cobra Inboard/Outboard #982554...
$13.41

Brass Drain Cock - 1/4" NPT

Brass Drain Cock - 1/4" NPT

Mfr. Sierra | Mfr No. 18-3223

Brass Drain Cock - 1/4" NPT
$11.41

Engine Coolant Temp Sensor, 5.8 F/I, 18-7602

Engine Coolant Temp Sensor, 5.8 F/I, 18-7602

Mfr. Sierra | Mfr No. 18-7602

Engine Coolant Temp Sensor, 5.8 F/I, 18-7602...
$61.82

Sierra, Hose Fitting, 3/4"  - 14NPT x 3/4" Hose, Brass

Sierra, Hose Fitting, 3/4" - 14NPT x 3/4" Hose, Brass

Mfr. Sierra | Mfr No. 18-8215

Sierra, Hose Fitting, 3/4" - 14NPT x 3/4" Hose, Brass. Lifetime warranty on Sierra Hose Barbs and other Sierra Engine Parts. Thousands of engine parts, lowest prices...
$15.29

Products: 1 - 13 of 13
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Post a question or comment about OMC Thermostats, Housings & Parts to our online boating community.
Question
Upper Gear case plug on my 1987 Starcraft I/O with a OMC Cobra stern drive - I lost the nut!

I have a 1987 Starcraft I/O with a OMC Cobra stern drive. Where the OMC Outboard Marine Corporation circle decal emblem used to be on the Upper gear case Vertical drive there was a plug with a screw. I unscrewed it and it was a mistake. The screw evidently had a nut that got lost inside. The plug measures about 1 & 1/8th inch and appeared to be plastic. Is this a freeze plug and where do I get one to replace it?

Submitted by: Gary
Answer

You will need to make sure you remove the nut from the drive since it will destroy the internals if you leave it. I believe the plug is an oil indicator plug and the nut behind should not have come loose.The best thing to do is contact your local OMC dealer for the replacement part.


 
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