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225hp Yamaha seized?

Old 03-26-2020, 10:07 PM
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Default 225hp Yamaha seized?

Hey guys, I was running today at around 25 kts when my anchor fell (faulty pin) and I quickly pulled back on the throttle and killed the engine. Tried starting it up again and wouldnít turn over. Removed the cowling and canít move the flywheel. Could that cause it to seize up? Thanks
Old 03-26-2020, 10:09 PM
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Be nice to know exactly what motor you have! it is possible to get water in the motor from doing what you have done, remove the spark plugs and see what you find, we need a little help to go with.
Old 03-26-2020, 10:11 PM
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Just to be 100% clear, did the anchor rope get wrapped around the prop? you didn't tell us that.
Old 03-26-2020, 10:13 PM
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did anchor line get in the prop?

Could it be you snatched throttle back from fwd to rev? That can hydrolock an engine.

Take plugs out and try to bar over.
Old 03-26-2020, 10:42 PM
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Thanks for the quick response. Itís a 2005 225hp Yamaha. The anchor line did not get wrapped in the prop thank god. Iím going to be taking the spark plugs out tomorrow to try and turn the flywheel
Old 03-26-2020, 10:45 PM
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Also I did not bring it all the way to reverse before killing the engine
Old 03-26-2020, 11:04 PM
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From what you have described, water injestion is most likely. Pull plugs and hand turn flywheel. If it turns ok squirt a little oil into the bores. Then check engine oil for water. If engine oil is ok and it turns by hand ok, roll it over on the starter with oiled bores and plugs out. Place rags to catch the oil coming out the plug holes. Once the oil is out and if engine is rolling over ok, put plugs back in and see if you got lucky.
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Old 03-26-2020, 11:50 PM
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Originally Posted by Stephen5 View Post
Thanks for the quick response. Itís a 2005 225hp Yamaha. The anchor line did not get wrapped in the prop thank god. Iím going to be taking the spark plugs out tomorrow to try and turn the flywheel
it's a 4 stroke then?
Old 03-26-2020, 11:54 PM
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If you are absolutely sure you didn't accidentally shift into reverse for a second (only you and the motor knows) then you might be lucky, if it's a 4 stroke and you did shift into reverse, you may have an unpleasant surprise waiting for you. One thing is sure, if salt water is inside the engine, find out right now, not tomorrow, not next time you get around to it, do it NOW!
Old 03-27-2020, 06:05 AM
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Sounds like a hydrolock.

Get those plugs out and get engine running ASAP. Also contact insurance. It most likely is not ok even if you get it running. Typically it will slightly bend connecting rods. It will seem fine but 40-100 hours down the road it will break the rod at the weakness of the bend. You can confirm bent rods by removing head and checking for piston height at tdc.
Old 03-27-2020, 06:20 AM
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Originally Posted by noelm View Post
it's a 4 stroke then?
Could be an HPDI two stroke.

Folks are loathe to tell us the model of their motors. Top secret info I guess.

Or maybe they just don't know what they have on the boat.

Now if a guy that has the motor does not know the model of the motor how are any of us to know what his specific problem is? Certainly won't stop any speculations however.

I am guessing that the sensor in his remote oil tank is faulty. I read once upon a time (here on THT I believe) that another fellow had that exact same thing happen to him. Wait, it was the ECU. He bought a new ECU and that fixed everything. Therefore, the OP of this thread needs a new ECU.
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Old 03-27-2020, 06:40 AM
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My Dad hydrolocked our Yamaha 3.3L F250. Accidentally shifted to reverse instead of neutral while traveling ~25knots. The water force can turn the engine backwards and a pressure wave of water travels up the exhaust and in to the engine. One of the connecting rods was bent.

I'm guessing that maybe even if you didn't shift in to reverse the drag of the anchor may have slowed the boat quickly enough that you got water up the exhaust.
Old 03-27-2020, 11:03 AM
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Don't wait to pull the plugs, do it asap. You don't want water sitting in the cylinders.

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