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Black tank valve doesn't hold things back [message #331794]

Mon, 07 May 2018 12:39

Olly Schmidt

Messages: 1265
Registered: February 2014
Location: Germany and Scottsville, ...

Karma: 8

Senior Member

Good day,

what's the best way to go about it? Get a new valve, or are there less expensive/messy options? Eventually I want to go the macerator route, but right now I just want to get the valve fixed.

Thanks.

Best regards

Olly Schmidt
PGP Key ID: 0x18a9 3a1f 4196 bf22
'76a Eleganza II, VA
'73 Sequoia, SH, Germany

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Re: Black tank valve doesn't hold things back [message #331796 is a reply to message #331794]

Mon, 07 May 2018 13:17

lqqkatjon

Messages: 2324
Registered: October 2010
Location: St. Cloud, MN

Karma: 5

Senior Member

Depends on the severity of the whole picture. Original valves and the mounting can be fragile.

You can get new valves and also rebuild
Kits, but you may cause more issues disturbing the valve. It is easy to add a valve downstream, and just leave the old valve open and in place.

Jon Roche 75 palm beach EBL EFI, manny headers, Micro Level, rebuilt most of coach now. St. Cloud, MN http://lqqkatjon.blogspot.com/

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Re: [GMCnet] Black tank valve doesn't hold things back [message #331800 is a reply to message #331794]

Mon, 07 May 2018 13:40

bdub

Messages: 1578
Registered: February 2004
Location: Central Texas

Karma: 5

Senior Member

I thought you only needed the end cap. Is the valve at the black tank
giving you trouble as well?
If so, those Thetford valves are rebuildable. Rebuild kits are available.
Depends on how yours is malfunctioning as to whether it'll work for you.
Will it just not close with the remote rod? Have you gotten under there and
tried forcing it at close range?

Billy

-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Peer
Oliver Schmidt
Sent: Monday, May 7, 2018 12:39 PM
To: gmclist@list.gmcnet.org
Subject: [GMCnet] Black tank valve doesn't hold things back

Good day,

what's the best way to go about it? Get a new valve, or are there less
expensive/messy options? Eventually I want to go the macerator route, but
right
now I just want to get the valve fixed.

Thanks.
--
Best regards

Peer Oliver Schmidt
PGP Key ID: 0x83E1C2EA

'76a Eleganza II, CA
'73 Sequoia, NH

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bdub
'76 Palm Beach/Central Texas
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Re: [GMCnet] Black tank valve doesn't hold things back [message #331801 is a reply to message #331800]

Mon, 07 May 2018 13:51

Olly Schmidt

Messages: 1265
Registered: February 2014
Location: Germany and Scottsville, ...

Karma: 8

Senior Member

For now all I know it is not closing. I will know more details when I get under it.

Thanks for the note re downstream and rebuilding. Both gives me something to think about.

Best regards

Olly Schmidt
PGP Key ID: 0x18a9 3a1f 4196 bf22
'76a Eleganza II, VA
'73 Sequoia, SH, Germany

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Re: Black tank valve doesn't hold things back [message #331812 is a reply to message #331794]

Mon, 07 May 2018 19:23

Matt Colie

Messages: 8547
Registered: March 2007
Location: S.E. Michigan

Karma: 7

Senior Member

Peer,

The Thetford valves have different fastener spacing than all the others. So, if you don't want a major headache, you have to get a Thetford valve back on there.

The fastener bosses often (usually) crack, but they can be made to hold load again if you drill several very small holes in the web and wrap them with safety wire (aircraft style) the threads of the upper two may be saved and the lower still used. The lower two can be drilled through 6mm and long enough fasteners used so washers and ESN (elastic stop nut - Nylok) for those. But the top two really don't want to be drilled through because the head will be inside the tank.... With the .032 (0.75mm) stainless saftey wire (about 6~8 turns) I have been able to Heilcoil (Spiral wire insert) those upper two and successfully make the fastener load. The bear with the Heilcoil is that the drive tag used to install it has to be removed from the blind hole.

I made a great effort to design a workable adapter to the other valves, but I just could never get to where I could turn it loose to the world.

Matt

Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit

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Re: Black tank valve doesn't hold things back [message #331822 is a reply to message #331794]

Tue, 08 May 2018 07:37

shaunone

Messages: 80
Registered: August 2016
Location: Cranbrook, B.C.

Karma: 0

Member

I'm with Jon. The quick and easy is to add a generic valve downstream until you get a macerator. Then you can replace your Thetford valve on the tank later and re-use your generic valve as your stinky slinky back up.

1977 Palm Beach, 455, mostly stock and original

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