Re: 82' Merc 115 inline 6, no power, 15MPH at 5200 RPM
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Posted by Ken Denman (220.127.116.11) on July 14, 2005 at 19:29:43:
In Reply to: 82' Merc 115 inline 6, no power, 15MPH at 5200 RPM posted by Jeff T. on July 14, 2005 at 15:19:44:
Generally, you trim the motor down after you come out of the hole.
A motor sucking air in planing attitude usually means that the motor is placed too high on the transom, or in rare cases, parts of the anti-cav plate are missing.
Are you sure you are pulling air? When a motor revs high with no forward movement of the boat it may also mean that the prop has spun -- that is, the rubber hub has broken down and is loosing traction with the prop housing. If you can, borrow a buddies prop to see if you get the same symptoms. If you can't , scribe a light mark that lines up on both the prop and the splines, take it out for a spin, then check after. If the marks no longer line up, then you have a spun prop.
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