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Author Topic:   clogged water intakes
SpeedBump posted 07-06-2004 09:35 PM ET (US)   Profile for SpeedBump   Send Email to SpeedBump  
Several areas of Barnegat Bay develop large pods of floating eel grass, especially in the channels. I have problems with the lower unit water intake getting covered with this grass and causing an engine temperature rise.

I had dol fins on my Yammi 40 on the 13' which occasionally collected the grass but the problem seems worse on my Nauset w/a 70 Nissan no fins or lift plate.

The nissan is mounted at a good height. It seems the contour of the hull channels this stuff directly to the lower unit where it wraps its self across the the back of the unit and covers the intakes restricting water flow at the intakes.

Any suggestions on eliminating the problem of grass accumuation?

Lars Simonsen posted 07-06-2004 10:00 PM ET (US)     Profile for Lars Simonsen  Send Email to Lars Simonsen     
We also have grass problems sometimes in the Albemarle Sound (usually after a long drought when the water becomes more saline). But you can usually see the grass patches (the tops of the plants float on or just below the surface) and avoid them. If you hit one of those patches, you have to stop, and put the motor in reverse to blow the grass off of the intakes. If grass in the water is an unavoidable and chronic problem, that solution may not work for you, though.


SpeedBump posted 07-07-2004 08:27 AM ET (US)     Profile for SpeedBump  Send Email to SpeedBump     
Lars- your suggestion is how we have been handling the problem along with slalom steering to clear the grass w/o having to stop. Thought there may be some type of gizzmo out there that would help divert the grass..
Lars Simonsen posted 07-07-2004 11:02 AM ET (US)     Profile for Lars Simonsen  Send Email to Lars Simonsen     
I saw a guy who mounted the head of a pitch fork in front of the lower unit, angled slightly back to push the grass down below the intakes and prop. It was his way of dealing with the problem, but I have no idea whether it worked. That's a low tech solution!


Bigshot posted 07-07-2004 11:47 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Growing up on LBI...those carpet islands are a PITA. The way i deal with it(before the alarm sounds) is watch the rooster tail of the engine. As the engine aquires grass it will start shooting a rooster tail out of the side of the engine. Some boats shoot it out one side and others from both. Watch your rooster just behind the transom when egine is clean and continue to watch it, you will see what I am talking about. Some boats are worse than ohers and some boats won't even pick up grass. My Baja and Scarab would laugh at seaweed and just puree it. Shallow draft it gets to be a pain.
rtk posted 07-07-2004 11:51 AM ET (US)     Profile for rtk  Send Email to rtk     
The grass has been bad out there on the Barnegat, even in the ocean outside the inlet. I do as Lars and you do- just try to avoid the patches but in the crowded Oyster Creek Channel sometimes there is no room to go. In the event I cannot avoid going through the patches I trim the motor up alot while running so hopefully the grass will just pass along the lower unit and not wrap.

I have had to stop a couple of times and clear it from the lower. I am not aware of anything out there that will solve the problem.


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