Flapper Boxes / Thermo Flaps / Rubber seals / Powder Coating

356 Porsche-related discussions and questions.
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Coker Golden
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Posts: 12
Joined: Sat Jun 06, 2009 11:49 am

Flapper Boxes / Thermo Flaps / Rubber seals / Powder Coating

#1 Post by Coker Golden »

All,
I'm considering powder coating my engine tin.
My coater says parts will see 400 F for 45 minutes.
Can the rubber flap seals handle this temperature?
If not, how have others managed to powder coat these pieces?

Thanks in advance for any advice!
Coker

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Tom Tate
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Posts: 1108
Joined: Wed Mar 26, 2008 9:27 pm
Tag: Boston MA
Location: Boston MA

powder coating

#2 Post by Tom Tate »

I'm sure that the heat doesn't do the rubber parts any good but it doesn't seem to bother them either. I've never had a problem.

Tim Berardelli
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Joined: Wed Apr 30, 2008 7:02 am
Location: Washington DC Area

Flapper Boxes / Thermo Flaps / Rubber seals / Powder Coating

#3 Post by Tim Berardelli »

And they are subjected to that much heat,or darn close to it while in operation!

Tim Berardelli
Subject: [356Talk] Flapper Boxes / Thermo Flaps / Rubber seals / Powder Coating
From: thomas.tate@opco.com
Date: Wed, 30 Sep 2009 11:00:29 -0700
To: 356talk@356registry.com

I'm sure that the heat doesn't do the rubber parts any good but it doesn't seem to bother them either. I've never had a problem.

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Tom Tate






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Jerry Henning
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Joined: Wed Mar 26, 2008 10:38 am

#4 Post by Jerry Henning »

Just make sure that the heater boxes are in the on position if possible, and tell the powder coater to make sure that the coating is not to thick around the rubber sealing area. I have had some come back with the rubber seals 'welded' with black powder paint to the boxes and had to use some care in freeing them up again.

Another tip - make sure your boxes are in good operating order before coating, as you don't want to be hammering around on them after they are beautiful again.

You can get new rubbers for the pre-heater flappers at the usual suspects.

Jery

Ken Daugherty
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Posts: 784
Joined: Wed Apr 09, 2008 8:20 pm

Flapper Boxes / Thermo Flaps / Rubber seals / Powder Coating

#5 Post by Ken Daugherty »

I wire the heater box flaps half open before sending to be powder
coated.

Ken Daugherty
kend356@insightbb.com


-----Original Message-----
From: Jerry Henning [mailto:kubel356@gmail.com]
Sent: Wednesday, September 30, 2009 5:01 PM
To: 356talk@356registry.com
Subject: [356Talk] Flapper Boxes / Thermo Flaps / Rubber seals / Powder
Coating


Just make sure that the heater boxes are in the on position if possible,
and tell the powder coater to make sure that the coating is not to thick
around the rubber sealing area. I have had some come back with the
rubber seals 'welded' with black powder paint to the boxes and had to
use some care in freeing them up again.

Another tip - make sure your boxes are in good operating order before
coating, as you don't want to be hammering around on them after they are
beautiful again.

You can get new rubbers for the pre-heater flappers at the usual
suspects.

Jery

------------------------
Jerry Henning
1962 356B-T6 Cabriolet
1973 Type 181 with 616/33-1 Pusher
Atlanta, Georgia USA
The 356 Southern Owners Group - www.356sog.com




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Diana Bergen
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Posts: 191
Joined: Thu Jul 10, 2008 5:36 pm
Location: South West

powdercoating heater boxes

#6 Post by Diana Bergen »

Ive seen many rubber seals in the heater boxes ruined by the powdercoat process , either they become brittle , or they are covered in powderpaint and no longer able to do what they are meant to do , seal the hole . If you are willing to do the extra work , its worth removing before paint and reinstalling after .
 Uwe & Diana

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Neil M. Fennessey
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#7 Post by Neil M. Fennessey »

How does one properly replace the rubber seals on the heater box inlet valves?
Back to the Ivory Tower I go!
 - Neil
'67 912/356D (Ol' Blue)
'82 HP 34C

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Diana Bergen
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Posts: 191
Joined: Thu Jul 10, 2008 5:36 pm
Location: South West

flappers

#8 Post by Diana Bergen »

Neil , You show me how to use the HP34C , and i'll do your flappers ! Seriously , it is a little involved in that you need to press the shaft out of the flapper/butterfly ,{after disassembling the spring , and cleaning & de-burring the end of shaft } then carefully pry open the two sides , or drill out the spot welds , remove and replace the rubber , then reassemble . Not hard , just busy . The air control cans up front in T6 are a little more involved , but make a big difference when done as they will work at keeping the air flow stopped and not bleed air constantly thru cracked seals ... Good Luck and thanks for causing me to do a set of mine , the last ones i did were for someone else's' engine and my car could use the fix as Winter is coming !
 Uwe & Diana

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Diana Bergen
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Location: South West

flappers

#9 Post by Diana Bergen »

Enclosed picture of flapper ... make a note of positions of parts before disassembling ! Now is the time to repair worn shafts and broken" ears" on actuator lever and reinforce the side of the snout , possibly w a washer welded to it ...
Image
 Uwe & Diana

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Ron LaDow
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Joined: Wed Mar 26, 2008 11:45 am
Location: San Francisco

Flapper Boxes / Thermo Flaps / Rubber seals / Powder Coating

#10 Post by Ron LaDow »

Steve,
Thanks for the info. I had no idea the shafts were simply pressed in place.
Thanks,
Ron LaDow
----- Original Message -----
From: "steve bergen"
To: 356talk@356registry.com
Subject: [356Talk] Flapper Boxes / Thermo Flaps / Rubber seals / Powder Coating
Date: Thu, 1 Oct 2009 07:06:59 -0700


Enclosed picture of flapper ... make a note of positions of parts
before disassembling ! Now is the time to repair worn shafts and
broken" ears" on actuator lever and reinforce the side of the snout
, possibly w a washer welded to it ...
[Image: http://www.postimage.org/Ts1iJWNS.jpg ]
(http://www.postimage.org/image.php?v=Ts1iJWNS)

------------------------
Reg.#1747 w'50 Mk5Jag,'54
356Cp#52725,'55$pdstr#80799,'55BeckSpyder#001,'56VWRagBaja,'64 356
SR#219786,'65 356Cp#221939,'65 356
SR#222130,'65ETyp.Jag4.2Rdstr,'66 21WdwVW,'67
911S#307228,'00Bxstr,'04DucatS4R,'83XR1KHrly,'04F250TrboDsl




Thanks,
Ron LaDow
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Ron LaDow
www.precisionmatters.biz

David Nicholls
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Tag: 56 Coupe #56209
Location: Sydney, Australia

#11 Post by David Nicholls »

IMHO, you have given us some more reasons, not to Powder Coat.
That is, unless you want your Tinware to look like moulded Plasticware.
Porsche used paint, something we can easily use today.
Regards,
David

Dick Weiss
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Lower aig guides (Flapper boxes)

#12 Post by Dick Weiss »

I would never powder-paint them; I do spend some time to reshape the sheet metal for flap clearances and proper fitment to the engine after repairing the shaft holes (if needed), but I don't disassemble the box itself. The seals will be hard from age (or missing) and I cut cresant-shaped pieces to replace the bad by prying open the crimped oval plate enough to remove them; add the new pieces w/a hi-temp sealant, and squeeze/close the lips to retain them; then I use a hi-temp black paint for finishing the whole box.

Dick

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Neil M. Fennessey
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#13 Post by Neil M. Fennessey »

Hi Steve,

Many thanks! I'm sure lots of people appreciate your tip as much as I do. My apologies for getting back to you a few days late.

To use the HP 35C requires the "Reverse Polish Notation" technique, as do all Hewlett Packard calculators. For example, to multiply two values together, first, open the fine leatherette case which is of course equipped with the requisite belt loop. Switch on and key in the first number and push the "enter" key. Next, key in a second number and then push the multiplication key.

Although TI-8xx are all the rage among my engineering students, fellow technoids such as Alan Klingen know that the red LED display beats the liquid crystal displays hands down! I should also mention you can run it on readily available rechargable batteries, so talk about "sustainability" and "curbing green house gasses!"

And not only that but the HP-34C more than held its own in the calculator races we used to run at MIT. Man oh man, was that some kinda' fun! Right up there with belt sander drag racing.
Last edited by Neil M. Fennessey on Sat Oct 10, 2009 10:40 am, edited 1 time in total.
Back to the Ivory Tower I go!
 - Neil
'67 912/356D (Ol' Blue)
'82 HP 34C

Dick Douglass
356 Fan
Posts: 316
Joined: Mon Apr 28, 2008 11:11 am
Location: Huntington Beach, Ca

H P 34 C

#14 Post by Dick Douglass »

When I was a student at Menlo in Menle Park, home of HP, we learned "HP HAS NO EQUAL!" :wink:

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Albert Tiedemann
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Re: flappers

#15 Post by Albert Tiedemann »

Diana Bergen wrote:Neil , You show me how to use the HP34C , !

Where do you get the battery pack for this model?
Albert Tiedemann, C356C
"The Hermit"

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