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Old 10-21-2010, 01:15 PM   #3
Marin
Scraping Paint
 
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Join Date: Oct 2007
Posts: 13,748
Operating a twin on one engine and fuel economy

Make sure your transmissions can be freewheeled without damage if you haven't already. Some transmissions can be freewheeled, some can't and some can only be freewheeled at slow speeds (like the old BW Velvet Drive).

Also make sure freewheeling a prop will not overheat the shaft log and packing gland. We cannot freewheel a prop on our boat at any speed because our shaft log depends on a water feed from its associated engine to help cool the shaft log. If the engine has to be shut down the water feed to the shaft log stops and if the prop is allowed to freewheel the spinning shaft will overheat the shaft log and packing gland to the point of severe damage in very short order. This is why we need to tie off the shaft if we have to shut down an engine.

-- Edited by Marin on Thursday 21st of October 2010 01:18:18 PM
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