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I have a 23 Wellcraft with a new Crusader MPI engine, the…

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I have a 23' Wellcraft...
I have a 23' Wellcraft with a new Crusader MPI engine, the engine seems to run great but the boat will not come up on plane, is it possable the out drive is at fault?... Read full answer
I have a 23' Wellcraft with a new Crusader MPI engine, the engine seems to run great but the boat will not come up on plane, is it possable the out drive is at fault?
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Answered in 14 minutes by:
6/16/2012
James
James, Marine Mechanic
Category: Boat
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Well, if the drive was geared too high it could cause the boat to not plane.

Is this motor the same as what was in it before? if not, what was in it?

same prop size?

Same drive?

What is the gear ratio of the drive?

the pitch and diameter of the prop?

 

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Customer reply replied 7 years ago
The engine in the boat before was a standard carberator 5.7 260 Hp . I put a new Crusader 5.7 MPI in it. The outdrive and all are origional mercruiser. The boat performed fine the first time I took it out, unfortunatly it sunk and I had to replace a lot of the electronics ,computer etc. It was winterized and when I put it in the water I couldn't get it up on plane. The boat will do at least 45 mph

Crap.

This is going to be an issue. The space between the floor and the hull is full of foam. Chances are real good yours is water saturated and you are probably carrying 1000 pounds of water around with you. This water wont drain out. The floor has to be brought up and the foam removed and replaced. If the foam used is open celled it holds water like a sponge.

What needs to be done is a hole drilled thru the floor near the transom as close to the stringer as possible and a probe stuck into the foam to check for water.

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Customer reply replied 7 years ago
I don't believe it's full of water or saturated as the mechanic had it on the water before it was winterized and said it ran fine. The fuel tank is under the floor near the transom. The boat doesn't seem to weigh more than it did before. It has been almost two years since it was under water,only the rear end was submerged,basically just the motor.Hope this helps,also My son who is an excellant Audi mech. seems to think it's the outdrive trans thats slipping.

Well, the drive can't really slip. Not without making a heck of a clattering. But the propeller can if the hub is damaged. Usually though that comes with very high rpms.

 

When your boat is struggling to plane out, how many rpms is it pulling?

 

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Customer reply replied 7 years ago
4,000 rpms at 10mph at best.

Pull your propeller off the drive and check the hub in it. You may have a broken hub is all. I'm sorry, I didn't realize there was such an extreme loss of propulsion involved here.

If your hub is rubber and you can't tell if it is damage, put a mark across from the inner hub to the outer hub and test the boat. If the lines no longer line up, your hub is shot.

James
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