Re: Need some help - Sending unit lock rings and gaskets/orings
[Re: 71TA]
#2247089
02/04/17 11:07 AM
02/04/17 11:07 AM
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Joined: Jan 2003
Posts: 2,601 Great White North
Furyman
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master
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Posts: 2,601
Great White North
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Never seen an O ring. The flat seal was used from 1957 to some models in 1978.Three part #'s ,1730096, 1948757 & 3404451 .Don't know the correct thickness for each one. The current repro lock rings that come with the majority of the senders are incorrect...not enough height so a thicker seal would be better.
"Long Live Mopars"
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Re: Need some help - Sending unit lock rings and gaskets/orings
[Re: 71TA]
#2247151
02/04/17 01:18 PM
02/04/17 01:18 PM
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Joined: Jan 2003
Posts: 12,431 Warren, MI
71TA
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I Live Here
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Warren, MI
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I'll have to snap a picture the O ring style was from a 73 Charger.
And the 2 lock rings I have, 68 B body and 73 B body, are both around .050" thick and they are rusty originals.
What are those part numbers Nigel? The seal?
Last edited by 71TA; 02/04/17 11:09 PM.
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Re: Need some help - Sending unit lock rings and gaskets/orings
[Re: tman]
#2247398
02/04/17 10:01 PM
02/04/17 10:01 PM
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Joined: Jan 2003
Posts: 2,252 New York
rarefish
top fuel
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top fuel
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Posts: 2,252
New York
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This seller claims NOS lock ring.
http://www.ebay.com/itm/142015687206?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT I doubt that the ebay part is a NOS part. This is what I came up with. The lock ring and gasket on the left are the original factory parts from my 1969 Dart. The new lock ring and gasket on the right came with the reproduction Spectra Preminum fuel tank that I bought last year. I have measured and shown the thickness of the parts.
Last edited by rarefish; 02/05/17 01:02 AM.
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Re: Need some help - Sending unit lock rings and gaskets/orings
[Re: rarefish]
#2247472
02/05/17 12:06 AM
02/05/17 12:06 AM
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Joined: Sep 2011
Posts: 92 Iowa
Davtona
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Joined: Sep 2011
Posts: 92
Iowa
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This seller claims NOS lock ring.
http://www.ebay.com/itm/142015687206?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT I doubt that the ebay part is NOS part. Why do you say that? What leads you to believe they are not NOS??
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Re: Need some help - Sending unit lock rings and gaskets/orings
[Re: 71TA]
#2247493
02/05/17 12:50 AM
02/05/17 12:50 AM
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Joined: Jan 2003
Posts: 2,252 New York
rarefish
top fuel
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top fuel
Joined: Jan 2003
Posts: 2,252
New York
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Great info rarefish. What year/model is that oem setup from? 1969 Dart GTS 340
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Re: Need some help - Sending unit lock rings and gaskets/orings
[Re: Davtona]
#2247499
02/05/17 01:01 AM
02/05/17 01:01 AM
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Joined: Jan 2003
Posts: 2,252 New York
rarefish
top fuel
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top fuel
Joined: Jan 2003
Posts: 2,252
New York
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This seller claims NOS lock ring.
http://www.ebay.com/itm/142015687206?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT I doubt that the ebay part is NOS part. Why do you say that? What leads you to believe they are not NOS?? Well for starters. If it was still in the factory packaging. I would believe it more, but if you look closer at how wide the gaps are on the outer edge of the ring and compare it to the gaps on the factory ring. You will see the ebay one is a lot like the aftermarket one in my picture. The OEM one has a 3/4" gap and the aftermarket one has a 2-3/16" gap.
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Re: Need some help - Sending unit lock rings and gaskets/orings
[Re: wannadrag]
#2247515
02/05/17 01:23 AM
02/05/17 01:23 AM
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Joined: Feb 2004
Posts: 7,196 Harrisburg, Pa.
screamindriver
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Harrisburg, Pa.
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Thicker seal isn't the problem it's the lock ring. The lock ring is to thin and bends. And, when you figure that out then use a factory ring let's hope you've bought a good tank and it doesn't bent the tabs on the "new" tank... I remember on one occasion going out for a build's maiden voyage pulling over for a quick inspection and seeing a drip at the sending unit...I crawled under there and just touched the sending unit and the lock ring popped loose from it's position !!! Talk about panic strength to reseat the whole mess along the road...I figured I was going to be a roast toasty when the gas hit the hot exhaust... That's the last time I've used the cheapy lock ring on anything...
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Re: Need some help - Sending unit lock rings and gaskets/orings
[Re: 71TA]
#2247811
02/05/17 04:00 PM
02/05/17 04:00 PM
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Joined: Jan 2003
Posts: 12,431 Warren, MI
71TA
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I Live Here
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I Live Here
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Warren, MI
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So I have a tank section and lock ring from a 68 B body and its .050" thick.
I'll have to pull the one from my own 71 Challenger and I may have to see if I can get a couple more like from a 62-65 B body.
If anyone is working on their car and has the gas tank out can you share a picture of the lock ring.
Last edited by 71TA; 02/06/17 03:50 PM.
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Re: Need some help - Sending unit lock rings and gaskets/orings
[Re: 71TA]
#2248403
02/06/17 12:53 PM
02/06/17 12:53 PM
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Joined: Sep 2011
Posts: 92 Iowa
Davtona
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Iowa
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The lock ring on Ebay http://www.ebay.com/itm/142015687206?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT these were available from dealers until fairly recently.
Agreed these are NOS but later issue. Does anyone have a source for the correct 1969 style ring with the "shorter gaps"? I could use 3 of them NOS.
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