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Looking for water inlet holes on my omc outdrive

Can someone tell me where to find the water inlet holes on my omc outdrive?

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  • Dean
    Dean May 11, 2010

    Do you have a model number of year for that engine?

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You should have slots on either side of the lowest part of the outdrive, above the skag or fin. There can be a difference if you have what is called a closed cooling system. The closed system has a radiator in front of the engine like an auto. The water from the lake goes through heat exchangers and does not make direct contact with the water in the radiator. The older open system uses lake water directly and it goes through the slots on the lower unit.

Posted on Jun 11, 2009

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My '83 OMC outdrive won't shift gears


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I have a 1985 bayliner with a 125hp volvo penta with 270 outdrive... i have 2 Q's 1. today the boat overheated pretty quickly, i think the thermostat has had it. after talking with some local boaters they...


It could be the thermostat is stuck in the closed position, but if you hear a troubling noise coming from the outdrive, I suspect the water pump impeller that is located in the outdrive is in need of replacement. A bad impeller in the outdrive will not assist in pumping water up to the engine, and will cause an engine to overheat quickly. The rough sound could be directly related to the impeller also, but could also be a different problem with the u-joint assembly or another outdrive internal component. Overheating can be caused by several things; Defective outdrive impeller, defective thermostat, clogged riser or manifold, defective engine mounted water pump assembly. These are the most common areas, but since there is a noise coming from the outdrive, I would concentrate trouble shooting this problem starting with the outdrive impeller assembly.

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1 Answer

3.0 omc sterndrive. I am getting no spark beyond my points. I installed a new cap, rotor,and plugs. any ideas?


Is the rotor turning? Check your coil and condenser.
The OMC drive system uses Micro switches in the linkage. They switch when the throttle positions are correct. The Micros operate the ignition Module.

Some of the outdrive systems have a starter cutout and some have an ignition cutout for the UP positon of the outdrive. The angle of the outdrive is too severe for the U-joints to move so they fix your boat not to start when the outdrive is UP.

Move your outdrive down and see if the igniton comes back.

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1 Answer

Omc 3.0 motor fires but will not start


Yes, the ignition switch or ignition wires on the Run side of the switch may be bad. Most people don't know that the Start side of the switch can power the spark plugs. But when you stop cranking and let the key go to Run you can lose the spark to the plugs

There is also a safety feature in the OMC system. The micro switches on the linkage have to be adjusted or timed. This is so the throttle is not set too high to engage the outdrive. So it does a lockout of the module or a lockout of the starter.

A second feature prevents starting if the outdrive is up too high. This prevents breaking Ujoints and dangerous planing conditions from an improperly trimmed outdrive. Lower the outdrive.

You will see the microswitches, see if the linkage can be moved to line up the contacts. They are simply contact switches and you may have to temporarily disconnect some linkage to test start.

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2 Answers

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1 Answer

Looking for electrical diagram-wiring- for 1989 Four Winns 251 Liberator with twin 350 chevys and OMC outdrives


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1 Answer

Omc sterndrive


You can try Bombadier(Spelling?) who bought out OMC. They still make some parts and should know.

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1 Answer

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1 Answer

5.8 cobra will not turnover starter has been tested


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