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Broken flywheel key Or Prop

J

jamiel

Member
Took my boat to te lake yester

Took my boat to te lake yesterday after cleaning carbs to test . Engine runs 100 % better but no have new a problem. I made out from the dock about 300 yds and the as I began to open up throttle . The engine just reved up to high rpms and the boat would not mve any more . I may have caused this myself after removing the nut on the flywheel the other day . I tourqed it down to 105 ft lbs like i was told to do . when on the trailer with the engine off I put it in gear and spin the prop . The prop has pressure but the flywheel doesn't turn like it should with the prop. Almost like its slipping. So my question is ... Is the key in the flywheel broken or the prop?
 
"Jamie.... If the flywheel key

"Jamie.... If the flywheel key sheared (broke), the engine would not run at all.

Sounds like either the prop is slipping, the engine is the wrong length (too short) for the boat, or the driveshaft splines are stripped (lets hope not).

The cavitation plate just above the propeller, on most engines, should be approximately 3/4" below the bottom of the boat at the transom (you don't say what engine you have).

Check the prop for slipping by removing the prop nut and spacer, then marking a straight line on the face of the prop down into the bronze hub. Replace the spacer and nut. Run the engine in the water and encounter the slipping problem. Now, again remove the nut and spacer and observe the line you drew on the prop and hub. If they now are out of line (moved), the propeller is slipping on the hub. The cure would be to replace the propeller or have it re-hubbed by a reliable propeller repair shop. Rehubbing would be the most reasonable way to go.

Let us know what you find."
 
Engine is 1979 100 hp evinrude

Engine is 1979 100 hp evinrude. You have helped me out of jams the past month or so with this engine. Will check it out maybe this weekend. So a sheared lywheel key is definiely not the problem?
 
"If you are looking at the pro

"If you are looking at the prop you cannot see the drive shaft.So post a picture, as exposed parts of the driveshaft or the propshaft DO NOT WEAR."
 
Looked at again with the prop

Looked at again with the prop off and I assume the shaft rises up a bit as it enters the housing . no wear on prop shaft. Thanks
 
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