Boat wont Plane

paulc81

Cadet
Joined
Jan 7, 2009
Messages
6
Re-Posted from general forum:
Hi all, looking for a little knowledge as im at the edge of my nerves with this. Ive got a 1986 Searay 21' cuddy w/a 5.7 merc. I had 4 ppl (700lbs) in the boat and she was hesitant to plane off, but did. I then topped off my gas tank w/ about 20 gallons. On the way out of the marina when i opened the throttle, rpm's wouldnt go over 3000 and she wouldnt plane out, causing a engine rod to bend. A week later I swapped the rod out and retested the boat, same results, would not plane w, just me on the boat. Boat is freshly bottom painted this season, however i did see some amount of growth on prop, but most came off naturally on way out of marina. What to do next???? PS tilt/trim all working properlyand ive owned the boat about 5 yrs without this problem
 

paulc81

Cadet
Joined
Jan 7, 2009
Messages
6
Re: Boat wont Plane

Prop is the same prop Ive used for the last 2 years, and it was a pushrod, manifolds and risers in good shape, acetone tested and painted every season as needed. I will get my hands on a compression gauge and post results.
 

sethjon

Senior Chief Petty Officer
Joined
Jun 8, 2010
Messages
692
Re: Boat wont Plane

Are you 100% sure the drive was all the way down?
 

stoweii

Recruit
Joined
Jun 11, 2010
Messages
5
Re: Boat wont Plane

Just A Thought I had that same problem and came to find out that my timing advance was stuck on my distributor boat would not get above 3000 rpm changed distributor and now runs great just a thought
 

paulc81

Cadet
Joined
Jan 7, 2009
Messages
6
Re: Boat wont Plane

Drive was definately down, Motor seems under immense load when accelerating, then the pushrod bent resulting in damge to the valve stem from the rocker being misaligned. Next step? change valve, then check compression?
 
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