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Coolant level sender o-ring

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Old May 8, 2012 | 05:52 PM
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Default Coolant level sender o-ring
Where does it sit on a new sender - on top of the tank neck or inside the neck?
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Old May 8, 2012 | 05:56 PM
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Inside the top of the sender.

https://rennlist.com/forums/7795914-post1.html

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Old May 8, 2012 | 06:17 PM
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Right, and when the sender is screwed into the tank neck, does the o-ring fit (tightly) inside the neck, or sit on top of it?
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Old May 8, 2012 | 06:37 PM
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On top, of course.

How else would it seal between the sender and the tank neck?
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Old May 8, 2012 | 06:43 PM
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When I unscrewed mine to repair the float the seal stayed inside the sender put Dow Corning on it and hand tight it back - no problem
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Old May 8, 2012 | 09:15 PM
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thats DC111 silicone non setting sealant
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Old May 9, 2012 | 12:26 PM
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Originally Posted by Randy V
On top, of course.

How else would it seal between the sender and the tank neck?
Wedged between the sender and neck wall is also possible if the o-ring is small enough. But I guess it makes more sense to be on top.

Originally Posted by Herman K
When I unscrewed mine to repair the float the seal stayed inside the sender put Dow Corning on it and hand tight it back - no problem
Originally Posted by Mrmerlin
thats DC111 silicone non setting sealant
Yes I have that.
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Old May 9, 2012 | 12:30 PM
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Found it: in Randy's link https://rennlist.com/forums/9152813-post47.html. That's a big o-ring and can only sit on top.

Thanks.
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Old May 9, 2012 | 12:37 PM
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Why does the placement of the seal concern you so much?
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Old May 9, 2012 | 12:43 PM
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Oh, I pulled the tank and found the seal broken and brittle. I have a box with new o-rings of different sizes and I'm trying to find the one closest to the original. Plus I'm a freak
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Old May 9, 2012 | 12:44 PM
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Ah, got it.
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Old May 9, 2012 | 01:11 PM
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anybody have a part number/size of the o-ring?
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Old May 10, 2012 | 12:22 PM
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Originally Posted by kelanel
anybody have a part number/size of the o-ring?
It is provided with the sender so it wouldn't have its own part number.
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Old May 10, 2012 | 01:40 PM
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ID 25 mm, OD 28 mm.
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Old May 10, 2012 | 01:47 PM
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Originally Posted by Leon Speed
ID 25 mm, OD 28 mm.
Thank you!! noticed mine has been leaking with the new resevoir (changed before i got it), pretty sure the o-ring is crumpled, good to have one on hand when i finally pull it.
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