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Old 06-02-2019, 06:36 PM   #1
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Stuck Lid on Raw Water Strainer MS 400

Hi, everyone. New to me 2007 MS 400. Tried to remove the lids on both the engine and generator Water Strainer on the first outing without success. Is there a special tool that fits the center square and wings?
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Old 06-02-2019, 06:41 PM   #2
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Called a spanner wrench. Once you get it off, check the o ring and put some silicon grease around it as well.
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Old 06-02-2019, 06:42 PM   #3
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https://www.westmarine.com/buy/groco...BoC1L4QAvD_BwE
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Old 06-02-2019, 06:52 PM   #4
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Greetings,
Mr. w. Welcome aboard. Nope. Sorry Mr. Gm. No spanner wrench for this lid. Get a large flat wrench, put it flat on top, turn counter clockwise, the wrench will engage in the ears/tabs sticking up and give you the leverage. If REALLY stuck, go the penetrating oil/gentle heat route.






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Old 06-02-2019, 06:56 PM   #5
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Thank you very much. Looked at the Grocco spanner wrench and could not figure out how it would work. Looks like a job for PB Blaster and patience.
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Old 06-02-2019, 06:56 PM   #6
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Ahhh now I put my glasses on. It only looks like mine! Thanks RT
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Old 06-02-2019, 07:00 PM   #7
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Originally Posted by Gmarr View Post
The one in the picture is for deck fitting and the old time Groco filters.

I have used a open end wrench on the ear and the bar of the wrench on the other ear and strain myself loosening it, making sure nothing slips off. Once off, check the o-ring and load the threads with anti-seize grease and remember to finger tight.
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Old 06-02-2019, 07:03 PM   #8
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Close the through hull. Put a wrench across the raised notches and lightly tap the end of the wrench with a rubber mallet (of which you should have two or three sizes on board). Increase tap pressure until it moves.

If you don't have enough room for a horizontal tap, put one lip of a wrench on a raised notch and tap with the mallet more vertically.
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Old 06-02-2019, 07:03 PM   #9
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Mr. Gm.
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Old 06-02-2019, 07:05 PM   #10
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PB Blaster, wait a while and a modest heat gun (not a torch) would be my suggestion, I would also suggest replacing the o-ring and silicone lube after, BTW heat the body not the cap.
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Old 06-02-2019, 07:23 PM   #11
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Chunk of flat bar across the flats and tap with hammer.
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Old 06-02-2019, 08:05 PM   #12
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Second on flat bar.
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Old 06-02-2019, 08:42 PM   #13
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Like the flat bar and tap, I would still PB and heat a bit
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Old 06-03-2019, 02:53 AM   #14
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Old groco filters

Don’t forget the neversieze when you put the lid back on
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Old 06-03-2019, 06:30 AM   #15
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don’t forget the neversieze when you put the lid back on
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Old 06-03-2019, 07:45 AM   #16
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Old 06-03-2019, 07:57 AM   #17
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I don't recommend just any antisieze....


Some contain metals that are incompatible in the saltwater environment.


A dielectric silicone, which is often aboard is find and good for the gasket much of the time.
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Old 06-03-2019, 08:09 AM   #18
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Neverseize would work, but man is it messy and as Psneeld says, you need to use one that is saltwater compatible. For bolt threads in the boat, I use the nickle based neverseize. For threaded fittings like this, I use the red marine "waterproof" grease.


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Old 06-03-2019, 08:11 AM   #19
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I use grease on the threads. Always come apart with a light tap.
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Old 06-03-2019, 08:17 AM   #20
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