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15 Yammy Weird Noise
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<blockquote data-quote="hwew" data-source="post: 391586" data-attributes="member: 1820"><p>The gear oil could be a different viscosity from what was in the gear case before it was serviced.</p><p></p><p>My guess is it could be gear clash noise or a bearing in the lower gear case or on the crankshaft. You mentioned that the prop was changed. I would start investigating there. Does the new prop spin freely without binding when the engine is in neutral. Does it make noise when you push on the exhaust/hub when spinning.</p><p></p><p>Pull the prop off and look for wear marks. It could be a bad fitting prop. While the prop is off check the propshaft. Make sure it is straight. A bent propshaft can bind bearings.</p></blockquote><p></p>
[QUOTE="hwew, post: 391586, member: 1820"] The gear oil could be a different viscosity from what was in the gear case before it was serviced. My guess is it could be gear clash noise or a bearing in the lower gear case or on the crankshaft. You mentioned that the prop was changed. I would start investigating there. Does the new prop spin freely without binding when the engine is in neutral. Does it make noise when you push on the exhaust/hub when spinning. Pull the prop off and look for wear marks. It could be a bad fitting prop. While the prop is off check the propshaft. Make sure it is straight. A bent propshaft can bind bearings. [/QUOTE]
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