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05-20-2018, 03:54 PM
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Join Date: Jun 2010
Location: Edgewood, NM
Posts: 203
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Fuel Drain (CAV-110)
I'm finally about 99% done with the fuel tank construction and the gorilla snot that goes with it (unless I discover a leak when it has cured long enough for testing), having installed the rear baffle and attach Zees this weekend.
First question: The last step on page 18-08 includes installing the fuel drain (part number CAV-110). When I try screwing it into the mating VA-112 drain flange it only goes in about halfway. Just by the look of it I expected it to thread all the way in until it bottoms out on the socket flats. For those that have finished the tanks, how far in did your drain go?
Second question: How long do you need to wait until leak testing your tanks? All the instructions say is to wait until the snot is cured, but based on my experience, that is subjective. I'm thinking a week may not be long enough, and a month is probably too long.
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05-20-2018, 04:00 PM
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Join Date: Sep 2007
Location: Central IL
Posts: 5,516
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Quote:
Originally Posted by asw20c
Just by the look of it I expected it to thread all the way in until it bottoms out on the socket flats.
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Half is not bad, it would be a problem it it did go to the flats.
At normal temps a good 2-3 weeks is enough to be sure it is cured.
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Bill
RV-7
Lord Kelvin:
“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”
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05-20-2018, 04:55 PM
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Join Date: Jun 2005
Location: Cedar Park, TX
Posts: 3,156
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That is a NPT thread. Study the available materials for it's properties, features, behaviors and expectations.
Bill's guidance doesn't need my concurrence  .
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Scott Card
CQ Headset by Card Machine Works
CMW E-Lift
RV-9A N4822C flying 2200+hrs. / Cedar Park, TX
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05-20-2018, 06:48 PM
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Join Date: May 2013
Location: Sherman, CT
Posts: 794
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Use a good pipe thread sealant and torque till it's snug, then just a little more. If you over torque the drain you risk splitting the aluminum flange. You might wait however to do the final installation since you may want to calibrate the fuel gauges or flush the tanks and drain in prep for weighing. The plastic pipe thread plugs should give you a good seal if you want to do a pressure test.
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Jake
RV6 #20477 completed 1991 sold.
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2020 dues gladly paid.
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05-21-2018, 07:24 AM
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Join Date: Nov 2014
Location: Richmond Hill, GA (KLHW)
Posts: 2,189
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SAF-AIR now makes a stainless version of the CAV-110 (CAV-110SS). I asked ACS to stock it but don't yet see it available.
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Ray
RV-7A - Slider - N495KL - First flt 27 Jan 17
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05-22-2018, 03:55 PM
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Join Date: Jun 2005
Location: Cedar Park, TX
Posts: 3,156
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Quote:
Originally Posted by Raymo
SAF-AIR now makes a stainless version of the CAV-110 (CAV-110SS). I asked ACS to stock it but don't yet see it available.
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And here is why one might consider the value of a stainless version after "a little" time in service. The spring is darn near "oxidized" through:

__________________
Scott Card
CQ Headset by Card Machine Works
CMW E-Lift
RV-9A N4822C flying 2200+hrs. / Cedar Park, TX
RV8 Building - fuselage / showplanes canopy (Done!)
Last edited by scard : 05-22-2018 at 04:06 PM.
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