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Old 30-04-2012, 11:03   #1
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What are these valves called and how do I loosen them?

These fuel valves are for selecting the fuel tank and returns. They are getting harder and harder to turn. I am not sure what they are even called.

I loosened the screw on the one on the right as pictured but that just removes the knob itself. I feel like it is requiring excessive torque to turn them now and I don't want anything to break. I sprayed some 6-56 in it but it didn't seem to help. Do I need to replace the whole valve and if so what is it called?


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Old 30-04-2012, 11:31   #2
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Re: What are these valves called and how do I loosen them?

Try looking on McMaster-Carr for Fuel shut-off Brass Plug Valves. That company has an amazing selection of usefull items and fast shipping. Bruce.
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Old 30-04-2012, 11:38   #3
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Re: What are these valves called and how do I loosen them?

Fuel Shut-Off Brass Plug Valves
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Old 30-04-2012, 11:39   #4
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Re: What are these valves called and how do I loosen them?

Those are pretty common fuel shut off valves. Probably only run $10 or so, but I may be out of date. Not sure why they are getting hard to turn... do they get turned much? If I remember right there is some sort of packing around the shaft... I think you turn the nut around the shaft to remove it. But as said... they are fairly inexpensive... although changing may be a pain....
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Old 30-04-2012, 11:39   #5
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Re: What are these valves called and how do I loosen them?

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Originally Posted by PamlicoTraveler View Post
These fuel valves are for selecting the fuel tank and returns. They are getting harder and harder to turn. I am not sure what they are even called.

I loosened the screw on the one on the right as pictured but that just removes the knob itself. I feel like it is requiring excessive torque to turn them now and I don't want anything to break. I sprayed some 6-56 in it but it didn't seem to help. Do I need to replace the whole valve and if so what is it called?


Fuel valve gate?at least they all have 2 clamps,thats a good thing..
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Old 30-04-2012, 11:46   #6
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Re: What are these valves called and how do I loosen them?

Thanks all. I think I need to look towards replacing them..
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Old 30-04-2012, 11:46   #7
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Re: What are these valves called and how do I loosen them?

Moeller Valve....More expensive than I thought!
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Old 30-04-2012, 11:59   #8
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Re: What are these valves called and how do I loosen them?

They can be dis-assembled and rebuilt. Mine have a male/female synthetic seat which compresses under the nut.
Wilcox/Crittenden IIRC
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Old 30-04-2012, 13:15   #9
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Re: What are these valves called and how do I loosen them?

When you replace them do not use white Teflon tape on the fittings.
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Old 30-04-2012, 13:48   #10
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When you replace them do not use white Teflon tape on the fittings.
An exactlly what should we use then ?
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Old 30-04-2012, 14:01   #11
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Re: What are these valves called and how do I loosen them?

yellow teflon tape, or pipe dope.
Thanks
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Old 30-04-2012, 14:02   #12
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Re: What are these valves called and how do I loosen them?

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An exactlly what should we use then ?
The best stuff is to use one of the anaerobic sealant / glues. Try and keep it away from the end of the fittings.
I use a European product called valve cimberio (loxeal 58.11). There is some special yellow Teflon tape for fuel fittings, but most experts do not recommend it for diesel use where even a tiny partical can clog an injector.
White Teflon tape is for water fittings and is not sutable.
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Old 30-04-2012, 14:39   #13
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Re: What are these valves called and how do I loosen them?

Please don't change those, they are very good. You loosen the big nut and they will slack off, if not a tap from the back will loosen them.
They can be re-lapped, repaired and will last a lifetime. You should tighten the large nut until the leak just stops, then the sealing is correct, not too tight, you will hurt the cone.
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Old 30-04-2012, 15:53   #14
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Re: What are these valves called and how do I loosen them?

I was just going to mention as above that those look like packing nuts under the levers. It could be that a fuel additive has caused the packing to swell a little, tightening up the throw. Try backing them off a little to see if it free's them up.
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Old 30-04-2012, 21:03   #15
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Re: What are these valves called and how do I loosen them?

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Please don't change those, they are very good. You loosen the big nut and they will slack off, if not a tap from the back will loosen them.
They can be re-lapped, repaired and will last a lifetime. You should tighten the large nut until the leak just stops, then the sealing is correct, not too tight, you will hurt the cone.
+1 on these as keepers.
The yellow tape is for propane, natural gas, acetylene, etc.
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