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Old 09-02-2014, 07:58   #1
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Best Practice to Seal Dip Tube

Noticed the dip tube was loose, and the seal degraded.

What would be the best way to seal the dip tube?

Best gasket material, or sealant?

I, naturally, want a quality, solid, long lasting repair
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Old 09-02-2014, 08:02   #2
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Re: best practice to seal dip tube

Quote:
Originally Posted by phantomracer View Post
Noticed the dip tube was loose, and the seal degraded.

What would be the best way to seal the dip tube?

Best gasket material, or sealant?

I, naturally, want a quality, solid, long lasting repair
Pictures? This is done in more than one way... assuming you mean the blackwater tank (diesel tanks also have dip tubes).
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Old 09-02-2014, 08:15   #3
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Re: best practice to seal dip tube

yes the diesel.

i attached a picture..welll i thought i did..
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Old 09-02-2014, 08:16   #4
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Re: best practice to seal dip tube

lets see if the attachment worked this time.
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Old 16-02-2014, 17:29   #5
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Re: Best Practice to Seal Dip Tube

trying again

picture of diesel dip tube

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Old 18-02-2014, 12:47   #6
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Re: Best Practice to Seal Dip Tube

If you are talking about the gasket under the hex fitting where the tube is attached, it would appear you will have to take up the whole plate, take the fitting apart and replace the gasket. That is an incredibly clean bilge!!!! WOW!!!
as for gasket material just go to a quality auto parts store. You could check with Navistar International In Medford. I can't remember if Brake and Electric are still in business down the road from them!
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Old 18-02-2014, 15:10   #7
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Re: Best Practice to Seal Dip Tube

yes, thank you. I was just wondering what was the best material to use and where to get it.. The covers come off regularly when I clean the fuel tank (every few years). The inside of the fuel tank is as clean as the bilge!
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Old 18-02-2014, 17:06   #8
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Re: Best Practice to Seal Dip Tube

Hi Phantom doing a web search I came up with Closed cell-nitrile Buna-N You should be able to get it at Atlantic Gasket on line. If you want to get it local I would check with truck supply places or at a full service marina locally.
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Old 18-02-2014, 18:52   #9
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Quote:
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Hi Phantom doing a web search I came up with Closed cell-nitrile Buna-N You should be able to get it at Atlantic Gasket on line. If you want to get it local I would check with truck supply places or at a full service marina locally.
Just be careful if your cruising area includes places where diesel has some biodiesel in it... There is some research showing that certain typss of biodiesel can degrade Buna-N nitrile, particularly when the fuel composition changes over time, as when you move from a place where they use biodiesel from soya beans to a place where they use canola oil, etc.

I have nust come back from a long delivery of a new boat in which I learned all this the hard way. The bits of rubber from the gasket ended up clogging even the check valves in the Racor filters (a pain to disassemble!).

If you will install new gaskets consider using Viton (solid or closed cell) that will resist any mix of biodiesel and even alcohol.. You will spend one or two hundred bucks but this is well worth it..
C
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Old 18-02-2014, 19:11   #10
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Re: Best Practice to Seal Dip Tube

see not such a simple question! After running into ethanol issues in my MGB, i knew I had to get the right rubber/gasket.

I have ordered a small patch of viton and will give that a shot. Thank goodness it is just the pickup tube, and not the main seal (which is in good shape). That stuff is off the hook expensive!
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Old 18-02-2014, 19:32   #11
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Re: Best Practice to Seal Dip Tube

Awesome, After almost 3000 surveys I have seen about six bilges that clean and one of those was mine ..... only flaw .... it should be white
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Old 18-02-2014, 19:55   #12
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Re: Best Practice to Seal Dip Tube

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Awesome, After almost 3000 surveys I have seen about six bilges that clean and one of those was mine ..... only flaw .... it should be white
I will bring it up with the previous owner who painted it! Maybe he will redo it!
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Old 18-02-2014, 20:04   #13
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Re: Best Practice to Seal Dip Tube

Is the engine compartment like that too ?
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Old 18-02-2014, 20:32   #14
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Re: Best Practice to Seal Dip Tube

Maybe! (just getting a bit off topic!)

Mind you, this restoration was completed in 1992 and the pictures taken in 2009! The previous owner is my MG mechanic (his shop and his restorations are at this same level of detail)

Check out the bronze bow roller he had cast at Edson Foundry

Not bad for a 46 year old boat!

On to the boat porn!







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