Little help for small problem

[howle]

This weekend I was out in the boat as usual. I was running WOT for my 260 Hp/350 (23-foot cuddy cabin). The RPMs are around 4600 with the 19 pitch stainless prop. Cruising along at 45 mph, I noticed the speed decrease about 5mph and the RPMs drop to 4100/4200. All crap did something blow up? I lifted the sundeck and seen water squirting from the exhaust manifold between the manifold and where it goes to the lower unit Y pipe.

My question here is do I have another problem that I am overlooking? In addition, why would I loose power?

I checked the oil and there was no water.

If this could cause a decrease in power, how?

I am looking to go to exhaust through the hull instead of the foot of the motor, is it worth it?

Thanks for all the information.

Howle

 

[coastalcruiser]

Re: Little help for small problem

If
Your engine rpm dropped, I think water is getting into the motor you must pull all the spark plugs and look for water in the cylinders. Water does not compress like air -fuel and if you havent bent the pushrods you will unless your engine siezes
If you find water get going on fixing this leak or your motor is about to become as Don would say, JUNK

 

[howle]

Re: Little help for small problem

Thanks for your reply.

I had no indications of failed valve, rough running, skipping etc...just a loss of power.

I am wandering could it be a carburetor issue or filter?

 

[Haut Medoc]

Re: Little help for small problem

Pull the riser on that side & check the water dumps & the riser/manifold mating surfaces for evidence of failure....​