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How to open fresh water tank

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Mads K View Drop Down
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    Posted: 19 January 2023 at 15:29
Wanting to clean our fresh water tank I have attempted to open the round inspection hatch but it is completely stuck. I have tried turning it in its counter clockwise direction with hands, wrenches, hammer + wood, and applied heat with a hair dryer. Did anyone experience difficulties opening the tank and what did you do?

Thanks!
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MasterKeil View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MasterKeil Quote  Post ReplyReply Direct Link To This Post Posted: 19 January 2023 at 16:12
If the tank is empty, then there could be underpressure in the tank.
Hanse 370#640 "Nemesis"
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Mads K View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mads K Quote  Post ReplyReply Direct Link To This Post Posted: 19 January 2023 at 16:16
Yes but there is a special hose that runs from the tank to a hole on the side of the boat that should take care of that if I'm not mistaken. Btw. it's 1/4 full.
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MasterKeil View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MasterKeil Quote  Post ReplyReply Direct Link To This Post Posted: 19 January 2023 at 16:25
Thats right. But, if the hull inlet of this hose is full of bugs (thats what i had) then the pressure relief function is not working. So check the inlet to make sure that there is pressure relief.
Hanse 370#640 "Nemesis"
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Captain Cook View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Captain Cook Quote  Post ReplyReply Direct Link To This Post Posted: 19 January 2023 at 16:45
I would manufacture a special tool for removing the lid. Use a solid piece of wood 50-70 cm long, and place two pieces of " pipe secured with two bolts to the wood. This way you will get the torque you need. Hammering on plastic in cold weather can cause unwanted results.
Freya H400 #27 (2006), 40HP 3JH4E, 2-cabin, 3-blade Flexofold, Aries LiftUp Windvane, Exturn 300, Jefa DD1,Simrad NX40,Icom M603(VHF)+M802(SSB)
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kipwrite View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote kipwrite Quote  Post ReplyReply Direct Link To This Post Posted: 19 January 2023 at 17:42
I was able to get mine open with a large GROCO spanner wrench. Took some encouragement. I've used the Groco spanner to open the fuel tanks as well. 
Kipwrite
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Mads K View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mads K Quote  Post ReplyReply Direct Link To This Post Posted: 20 January 2023 at 21:53
Thank you for the replies. I tried opening the outside water tank inlet to eliminate any vacuum but I was still unable to open the inspection hatch. I'll try to construct a tool based on your advice and try again.
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Mads K View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mads K Quote  Post ReplyReply Direct Link To This Post Posted: 21 January 2023 at 09:16
Here is the tool that did the job, manufactured from some leftover bolts and some driftwood and plastic pipe that was washed up on the beach.


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Martin&Rene View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Martin&Rene Quote  Post ReplyReply Direct Link To This Post Posted: 21 January 2023 at 17:34
I just use a pair of pliers or pincers.  Put the ends of the handles into the two slots opposite one another and the just put a piece of bar or wood through the handles so you can get more power.  (you are using the pliers upside down.)

If there is any muck in the tank, then I use a whale submersible pump to clear it,  I tape it onto a thin old sail batten and you can clean up any residue.  It could also act as a spare emergency water pump. 


Just put some vaseline on the seal and you only need to re- tighten the cover t by hand.
Martin&Rene Hanse 341 Dipper Wheel steering, 3 cabin layout, normally based in Scotland
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H8jer View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote H8jer Quote  Post ReplyReply Direct Link To This Post Posted: 22 January 2023 at 06:36
Originally posted by Mads K Mads K wrote:

Here is the tool that did the job, manufactured from some leftover bolts and some driftwood and plastic pipe that was washed up on the beach.

Hi Madsk
Recycling when it is at it's best?Big smile
Was the tank dirty?
Have you not winterpreserved your boat?



Hanse 370#487 30HP 3-cabin
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