Leaking primer

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ulster1
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Joined: Sun Nov 17, 2024 1:48 pm
Name: Mark S Werner
Location: Alamogordo, NM
Aircraft Type: 140
Occupation-Interests: Retired Delta mechanic
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Leaking primer

Post by ulster1 »

My 140 primer leaks a few drops. It’s a lunkenheimer Co. pat 1917 primer. Does anyone stock parts?
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6597
Posts: 534
Joined: Tue May 01, 2018 7:00 am
Name: David Sbur
Location: Vancouver WA KVUO
Aircraft Type: '46 140 0-200A
Occupation-Interests: Agriculture
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Re: Leaking primer

Post by 6597 »

Most likely not. I believe the Lunkenheimers used packing instead of the more (now) common o-rings. I have never had one apart and hopefully someone will chime in.

Here's a ditty I found from an Ercoupe driver discussing his 'old' primer, it may be useful...


Lunkenheimer Primer _ Leaks - Ercoupe Owners Club.png
Lunkenheimer Primer _ Leaks - Ercoupe Owners Club.png (330.2 KiB) Viewed 63 times
And a ditty from the Cub guys...

https://www.supercub.org/forum/threads/ ... ild.32161/
Last edited by 6597 on Fri Jul 17, 2026 8:22 am, edited 1 time in total.
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6643
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Name: John C
Location: KLCI, NH
Aircraft Type: 1946 C140/C90
Occupation-Interests: A&P, semi-retired
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Re: Leaking primer

Post by 6643 »

Just one thing: If your primer is like the one described, oiling it won't do any good because each time you pump it the whole thing fills up with fuel, washing away any oil you might have put there.

Fuel lube (Ez-turn) on the leather packing sounds like a good idea, though.
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