Dempster bonnet

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CTXmiller
Posts: 326
Joined: Sat Dec 15, 2018 12:01 pm
Location: Waco, TX

Dempster bonnet

Post by CTXmiller »

While skimming the FB Marketplace, I saw this Dempster which had a unique bonnet with a filler spot and/or dipstick. Hadn’t seen this before.
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Wayne
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Joined: Mon Dec 17, 2018 10:03 am
Location: Corsicana Tx.

Re: Dempster bonnet

Post by Wayne »

Pretty neat. Southern Engineering at it's best. Never need to remove the bonnet and loose your seal.
FlJet
Posts: 114
Joined: Tue Aug 04, 2020 3:41 pm
Location: North Central Florida

Re: Dempster bonnet

Post by FlJet »

Well crap. When you install a bonnet what do you use to seal it? Wasn't on my radar until I read this.
Wayne
Posts: 1203
Joined: Mon Dec 17, 2018 10:03 am
Location: Corsicana Tx.

Re: Dempster bonnet

Post by Wayne »

Some had gaskets I think. We need Windy Bob he could answer all these questions in an intelligent manner. No guessing!
CTXmiller
Posts: 326
Joined: Sat Dec 15, 2018 12:01 pm
Location: Waco, TX

Re: Dempster bonnet

Post by CTXmiller »

Some had gaskets like the Baker Monitor (WB, etc.) and some had lip joints (maybe not the correct terminology there). Keeping rain and dust/debris down from accessing the internals of the gearbox was desired. Using non-detergent oil allows the dust/debris to sink to the bottom of the gearbox as opposed to suspending the grudge and clogging any oil passages necessary for oiling bearings.
FlJet
Posts: 114
Joined: Tue Aug 04, 2020 3:41 pm
Location: North Central Florida

Re: Dempster bonnet

Post by FlJet »

"Lip Joint" sounds like my situation. My bonnet sits onto of the case, the case and bonnet overlaps, the bonnet on the outside, the case on the inside. I'll get humidity condensing in my case but there's nothing I'll be able to do about that even if I sealed the bonnet to the case.
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Terry
Posts: 119
Joined: Thu Dec 27, 2018 8:32 pm
Location: Moundridge Ks.

Re: Dempster bonnet

Post by Terry »

On the last Dempster I worked on the gasket was gone. So I went to the hardware store and bought the cotton clothes line rope. The kind grandma used for her clothes line and glued it in the lip with gasket sealer.
Right or wrong that is what I done. Seams to work.
Terry
Ron Stauffer
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Location: Uncompahgre Plateau Montrose CO
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Re: Dempster bonnet

Post by Ron Stauffer »

Burdick & Burdick out of El Paso did helmets like that on the bigger E & F Aermotors. I dont think they ever were a Dempster so maybe they were copied. There was no dipstick just a filler tube and a cap.

B & B helmet.jpg

Ron Stauffer
Montrose CO
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