F 40/40 Engine Raw Water intake

Engines, Drive trains, Propellers, Steering, Ground Tackle and other mechanical system

F 40/40 Engine Raw Water intake

Postby TonyB » Wed Jul 10, 2019 8:01 pm

Well last week we took Circe up into the CA Delta. And clogged the raw water intake twice. Very frustrating. In more than 10 trips on my Newport 30 to the Delta, the intake never clogged once. Guess the pressure and volume are much higher on the intake, also the location isn't as good. On the Newport the intake was almost behind the keel, allowing the keel to divert weeds. The Delta has lots of floating weeds, like the kind you see in aquariums, only much longer.

First time the strainer basket was filled, but cleaning it out didn't solve the problem. I had to dive the boat and pull the offending weeds out of the intake from the bottom. That worked well the first time. The second time we were underway and had to anchor in a 2 kt current. Clearing strainer didn't work. Diving under with multiple safety lines to keep me from being swept away, yielded no results.

So we motored at 1500 rpm for several hours keeping an eye on temperature. Luckily about the same time the engine heat started to creep up we were able to start sailing. When we got to a marina that night, I was able to get several large and compacted plugs of weed out of the intake hose between the through hull and the sea strainer. I used a short piece of copper wire with a hook fashioned in the end of it. And a lot of patience. Then the intake was clear! But what a hassle. If I had a spare piece of hose I would have taken the existing one off to clear it, but I was too afraid I would damage the hose getting it off the barbs and had no backup.

I am thinking of redesigning this short piece of hose, which has a 90 fitting to get into the strainer. Maybe I will figure out how to insert a "T" as a cleanout. A short piece of dowel aimed straight down the hose would have cleaned it out quickly.
Tony
SV Circe 1997 Freedom 40/40 - Hull #20 - Brickyard Cove Marina, Richmond, CA
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Re: F 40/40 Engine Raw Water intake

Postby Camino » Wed Jul 10, 2019 9:53 pm

Hi Tony

Sounds like a real pita for true! Sorry to hear. I have the f 35 Pedrick. Raw water intake is amidships right in the middle of the keel to hull joint starboard side. Delta weed is bad - you are right. We steer around it at every opportunity and try to stay in deep water. We have not had a problem with clogging yet. Goodway was at Stockton sailing club all of June and last Friday and Saturday Stephanie and I brought her back to Emeryville - Stephanie said she would never do that voyage again! Suisun and SAn Pablo returning were brutal. We hope your idea works and am interested in the outcome!
Tom and Stephanie
Good Way II F 35 (P)
1999. Wing Keel 5’
3GM30F, 3-blade maxi prop
Emery Cove, CA
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Re: F 40/40 Engine Raw Water intake

Postby TonyB » Thu Jul 11, 2019 1:36 am

Yeah that is exactly where the intake is on Circe. The keel kind if guides the weeds right into it!! I will post what I end up doing but it might be awhile. As I have other higher priority projects.

As for bashing back from the Delta I can give you some pointers if you are interested. Done it lots of times and developed some tricks over the years. Let me know.

Tony.
Tony
SV Circe 1997 Freedom 40/40 - Hull #20 - Brickyard Cove Marina, Richmond, CA
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Re: F 40/40 Engine Raw Water intake

Postby Paul Langevin » Thu Jul 11, 2019 3:09 pm

Hi Tony, we have Freedom 40/40 hull #11 Star Struck. When she was refitted by Paul Dennis in 2012 one of his improvements was to install a 90 degree elbow with a removable plug facing upwards at the location where the raw water intake comes through the hull(before the raw water strainer). This allows us to clear any pre-strainer clogs, such as eel grass, by closing the through hull and removing the plug. One two different trips we picked up a very long strand of eel grass in Stonington! Conn. that impeded water flow just enough to make the engine temperature rise but not enough to stop water flow through the system. After checking the strainer and finding it to be clear, I pulled the plug and found a 1" x 12" strand of eel grass coiled up in the intake line before the Groco strainer. The refitted clean out plug saved a lot of downtime and hassle. Perhaps you should consider the same improvement on your boat. Safe cruising. Paul
Paul Langevin S/V StarStruck, Freeedon 40/40
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Re: F 40/40 Engine Raw Water intake

Postby TonyB » Thu Jul 11, 2019 3:55 pm

Hey Paul,
That was exactly my thought. Replace the 90 with a T with a cap on top. Sounds like it works well. When I get around to it I will post some photos. Thanks!
Tony
SV Circe 1997 Freedom 40/40 - Hull #20 - Brickyard Cove Marina, Richmond, CA
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Joined: Tue Sep 25, 2018 2:33 pm
Location: San Francisco Bay Area, California


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