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Swelling gas cap

 
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ledson



Joined: 29 Apr 2009
Posts: 62

PostPosted: Sat Jan 24, 2015 7:52 pm    Post subject: Swelling gas cap Reply with quote

I've noticed that the gas cap on my allegro 2000 is getting very difficult to remove and replace. I Believe the the plastic cap has swelled or expanded to the point that it can't be removed with out the use of pliers.
I thought that it might be the O ring that was causing the problem, so I removed the O ring and tried putting the gas cap on. No luck. It was still just as tight.

If anyone has had this problem and knows a fix, please let me know.

Thanks,

Larry
N4362C


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jlhazen(at)copper.net
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PostPosted: Sat Jan 24, 2015 10:01 pm    Post subject: Swelling gas cap Reply with quote

Are you using 100ll or pump gas with ethanol?  I don't think ethanol is good for plastic parts.
Jim
N44469



<div>-------- Original message --------</div><div>From: ledson <Larryedson(at)ymail.com> </div><div>Date:01/24/2015 8:52 PM (GMT-07:00) </div><div>To: allegro-list(at)matronics.com </div><div>Subject: Allegro-List: Swelling gas cap </div><div>
</div>

I've noticed that the gas cap on my allegro 2000 is getting very difficult to remove and replace. I Believe the the plastic cap has swelled or expanded to the point that it can't be removed with out the use of pliers.
I thought that it might be the O ring that was causing the problem, so I removed the O ring and tried putting the gas cap on. No luck. It was still just as tight.

If anyone has had this problem and knows a fix, please let me know.

Thanks,

Larry
N4362C




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http://forums.matronics.com/viewtopic.php?p=437599#437599


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aerosiam



Joined: 26 May 2008
Posts: 59

PostPosted: Sat Jan 24, 2015 10:50 pm    Post subject: Re: Swelling gas cap Reply with quote

I also had a problem with the gas cap about 2 years after I bought the plane. It leaked and was difficult to remove. I replaced it with the non-lockable version from the factory. It's been ok for 6 years.
I have always used 95 octane for the 100hp engine.

Does anyone use ethanol and has it caused any problems to the lining of the fuel tank of any other fuel parts?


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brad(at)vision-technology
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PostPosted: Sun Jan 25, 2015 6:10 am    Post subject: Swelling gas cap Reply with quote

Is the cap tension adjustable?. I seem to recall Thom Riddle, the previous owner of my plane, saying it was and that it was always a trade-off between having it tight enough to seal, yet loose enough to get it on & off.
Brad Kramer
N221FA


[quote]--


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ledson



Joined: 29 Apr 2009
Posts: 62

PostPosted: Sun Jan 25, 2015 1:31 pm    Post subject: Re: Swelling gas cap Reply with quote

I've been using auto gas with ethanol since I've owned the airplane and the
PO only used auto gas.
Yes, the gas cap can be adjusted using a small nut inside the cap. But I know that isn't the problem.
I may consider buying a new cap from Aircraft Spruce. I was hoping that there may be a solution to the problem that doesn't involve buying a new cap.

Thanks,

Larry
N4362C


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hgmckay



Joined: 23 May 2006
Posts: 397

PostPosted: Sun Jan 25, 2015 4:59 pm    Post subject: Swelling gas cap Reply with quote

The only problem I have had with my Allegro 2000 gas cap was that it began to leak gas from the key slot (it was a lockable gas cap). I replaced it with a cap from Lockwood Aviation that had no key/lock. Problem solved. No more leaking of fuel. My Allegro 2000 is almost eight years old (678 hours on the Rotax 80 hp 912UL engine). I have had no problem with the Gas cap being too tight. I use only 93 Octane Ethanol free gas.

Hugh G. McKay III, P.E.
Senior Consultant
Worldwide Engineering Inc.
4090 North NC Hwy. 16
Denver, NC 28037

Ph. 704-661-8271
Fax 704-483-5466
email hgmckay(at)bellsouth.net
http://www.wwegeo.com

From: brad(at)vision-technology.com (brad(at)vision-technology.com)
Sent: Sunday, January 25, 2015 9:08 AM
To: allegro-list(at)matronics.com (allegro-list(at)matronics.com)
Subject: Re: Swelling gas cap




Is the cap tension adjustable?. I seem to recall Thom Riddle, the previous owner of my plane, saying it was and that it was always a trade-off between having it tight enough to seal, yet loose enough to get it on & off.
Brad Kramer
N221FA

[quote]--


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N456TS



Joined: 15 Aug 2015
Posts: 70

PostPosted: Sun Aug 16, 2015 3:17 pm    Post subject: Re: Swelling gas cap Reply with quote

Hello.
I also had an issue with the gas cap being hard to turn. For me, there was an interference fit where the hollow circular section of the back half mates with the front half. It required sanding down the OD of the circular section and opening up the grove that it mates with.
Bradley Pearce
N456TS
LSRM-A


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ledson



Joined: 29 Apr 2009
Posts: 62

PostPosted: Thu Aug 20, 2015 11:25 am    Post subject: Re: Swelling gas cap Reply with quote

Mine was not a problem with turning the lever to unlock it, mine was with
The circumference of the gas cap. I replaced the cap with one from Aircraft Spruce and there was not a problem after that. I also found a source for ethanol free high test gasoline and have been using that exclusively since. The old cap was placed on the shelf in my hanger for the last 6 months and last week I tried putting it back on the airplane. It fit like a new one and
was no problem to remove and install. This shows me that there is
certainly a problem with some plastic parts being in contact with ethanol.

Thanks for everyone's help!

Larry
N4362C


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