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Hull dents
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<blockquote data-quote="LarryMc" data-source="post: 429739" data-attributes="member: 13895"><p>Since OBJ recommends a clearance of .030" with an aluminum impeller and you say the .015" gauge is tight in spots, I'd say you need to run it before trying to add another shim on top. If I'm running a liner with some noticeable wear on it, I like to paint the inside of the liner with some black spray paint after adding shims on top. Makes it easier to tell if the impeller is rubbing.</p><p></p><p>FWIW, I don't think there is anything to gain by running an impeller with less than .020". It usually just results in more wear on the liner and impeller with little or no gain in performance.</p></blockquote><p></p>
[QUOTE="LarryMc, post: 429739, member: 13895"] Since OBJ recommends a clearance of .030" with an aluminum impeller and you say the .015" gauge is tight in spots, I'd say you need to run it before trying to add another shim on top. If I'm running a liner with some noticeable wear on it, I like to paint the inside of the liner with some black spray paint after adding shims on top. Makes it easier to tell if the impeller is rubbing. FWIW, I don't think there is anything to gain by running an impeller with less than .020". It usually just results in more wear on the liner and impeller with little or no gain in performance. [/QUOTE]
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