lunkenheimer primer

Maintenance, parts and services related to Cessna 120/140's

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lunkenheimer primer

Postby David Sbur » Mon Feb 07, 2011 12:23 am

Does anyone have a pic of an apart Lunkenheimer primer? I know mine doesn't have o-rings and I need a thread-like packing material for the stem. Mine works and doesn't have any visible leaks, but a hangar discussion suggests that my idle-cutoff issues (have to run up the rpms 2000-ish before I pull the mixture off to shut down the engine) for my 0-200 (MA3SPA carb) may be the primer allowing some fuel to get by. First off I'll try plugging off the primer.

I doubt this is my problem but if anything I'd like the info for my files.
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Dave Sbur/Vancouver WA
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Postby dcm » Mon Feb 07, 2011 12:11 pm

I think I have one like that. I'll look tonight and take a picture....btw I have two Luke's. One is shorter than the other...I would like to sell them.

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Postby John C » Mon Feb 07, 2011 1:41 pm

If I recall correctly, there is a spring loaded brass "needle" on the end of the plunger that closes off the outlet of the pump chamber when the plunger is locked.
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Postby Jim Doody » Thu Sep 22, 2011 8:30 pm

In regard to the Lukenheimer primer does anyone know the size on the inlet/outlet fittings? Mine is not 5/16-32 or 24, in fact I do not believe it is a US standard pitch. My 32 tooth pitch gage runs out about 5-6 teeth in so it's not 32 pitch, maybe 34 or 36. Here's a pic beside a 5/16-32 primer nozzle. Any help appreciated. Jim
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Postby John C » Fri Sep 23, 2011 2:42 pm

Re you sure it's not a pipe thread? Do you have a 27 tpi gauge?
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Postby nyxon » Fri Sep 23, 2011 6:58 pm

My Lunkenheimer doesn't work at all. Where can I purchase O rings for it?


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Postby Jim Doody » Fri Sep 23, 2011 8:48 pm

I do not have 27 tpi gage, I expect it to use a compression nut like all the rest but at this point I just do not know. It fits an 8mm bolt gage perfect, am I heading in the wrong direction? Perhaps NPS? The Luke primer has no O rings. Go to True Value aviation supply and get some 3/32 teflon valve packing. Be sure the little washer on the shaft is not worn to the point it falls into the primer. Wrap about 4 turns of packing around the shaft between the washer and lock nut. Lube with EZ turn and you should be good to go.
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Postby Jim Doody » Fri Sep 23, 2011 8:59 pm

I do have a 27 tpi gage, N/G. Re-checking it leads me to think it 32 tpi, close to 5/16 but no go. You can see the difference in the pic. Any further advice appreciated.
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Postby nyxon » Fri Sep 23, 2011 10:09 pm

Thanks for the info Jim.


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Postby John C » Sat Sep 24, 2011 11:14 am

Where did you get the primer? I have an installation drawing for a Lukenheimer D-4010 primer in an Ercoupe. It shows AN816-2D fittings screwed into female 1/8" pipe threads on the primer.

Looks like yours is an "outie" and you need an "innie"....
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Postby Jim Doody » Sat Sep 24, 2011 4:26 pm

Must be a different model primer as mine is threaded on the outside. Where did I get it? Came with a Champ project about 30 years ago and I have just decided to use it. :D Jim
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