Matronics Email Lists Forum Index Matronics Email Lists
Web Forum Interface to the Matronics Email Lists
 
 Get Email Distribution Too!Get Email Distribution Too!    FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

HRII Fuel Pump Vent Clearance

 
Post new topic   Reply to topic    Matronics Email Lists Forum Index -> Rocket-List
View previous topic :: View next topic  
Author Message
viperpilot



Joined: 28 Aug 2012
Posts: 11
Location: Peachtree City, GA

PostPosted: Sat Dec 08, 2012 2:20 pm    Post subject: HRII Fuel Pump Vent Clearance Reply with quote

I am finally returning my ship to flying status, having been aground for upgrades and fixes following a prop strike nearly a year ago. Mounting the IO-540 with new elastic mounts has changed the clearance at the back of the engine a bit. The engine-mounted fuel pump drain is uncomfortably close to the firewall. The firewall has been dimpled inward a bit to increase clearance during the previous engine installation, but additional dimpling does not appear to be available due to the proximity of a vertical structural member on the cockpit side of the firewall.

1. Does anyone know of a method to increase clearance between the firewall and the fuel pump drain?
2. I have seen a few drain elbows of other aircraft that look to be smaller (or at least project aft less than the AN832-type fitting). Are these available or are they custom made from an AN832-4?
3. Vans notes that the threads on the Lycoming fuel pump are "special" and that NPT threads will not work--does that note apply to the vent drain?
4. I assume that the vent drain only comes into play if there is a rupture in the fuel pump diaphram. In that case, one is looking for fuel or oil coming from the vent drain as a major clue that the fuel pump is about to fail. Is that an accurate statement?

Any assistance or comment would be greatly appreciated.

Thanks,
Randy Sage
Peachtree City, GA


- The Matronics Rocket-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Rocket-List
Back to top
View user's profile Send private message
stuart(at)stuarthutchison
Guest





PostPosted: Sat Dec 08, 2012 3:27 pm    Post subject: HRII Fuel Pump Vent Clearance Reply with quote

G'day Randy,

The vent thread is tapered and I'm pretty sure it's NPT. The other fittings
are straight thread, sealed by O-ring.

I used a lathe, but the link shows one option. I ground the JB Weld flat
of course.

http://www.mykitlog.com/users/display_log.php?user=RockFLY&project=797&categ
ory=5584&log=131278&row=53

As you say, this should only vent fuel if the diaphragm is failing ... the
intent is to stop fuel entering the crankcase through the hole where the
actuator arm penetrates (top side of the diaphragm).

Kind regards, Stu

F1 Rocket VH-FLY http://www.mykitlog.com/RockFLY
www.teamrocketaircraft.com

--


- The Matronics Rocket-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Rocket-List
Back to top
hr2pilot(at)aol.com
Guest





PostPosted: Sat Dec 08, 2012 3:29 pm    Post subject: HRII Fuel Pump Vent Clearance Reply with quote

Do away with the fitting

Sent from my iPhone

On Dec 8, 2012, at 2:20 PM, "viperpilot" <nsage86(at)comcast.net> wrote:

Quote:


I am finally returning my ship to flying status, having been aground for upgrades and fixes following a prop strike nearly a year ago. Mounting the IO-540 with new elastic mounts has changed the clearance at the back of the engine a bit. The engine-mounted fuel pump drain is uncomfortably close to the firewall. The firewall has been dimpled inward a bit to increase clearance during the previous engine installation, but additional dimpling does not appear to be available due to the proximity of a vertical structural member on the cockpit side of the firewall.

1. Does anyone know of a method to increase clearance between the firewall and the fuel pump drain?
2. I have seen a few drain elbows of other aircraft that look to be smaller (or at least project aft less than the AN832-type fitting). Are these available or are they custom made from an AN832-4?
3. Vans notes that the threads on the Lycoming fuel pump are "special" and that NPT threads will not work--does that note apply to the vent drain?
4. I assume that the vent drain only comes into play if there is a rupture in the fuel pump diaphram. In that case, one is looking for fuel or oil coming from the vent drain as a major clue that the fuel pump is about to fail. Is that an accurate statement?

Any assistance or comment would be greatly appreciated.

Thanks,
Randy Sage
Peachtree City, GA




Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=390071#390071












- The Matronics Rocket-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Rocket-List
Back to top
viperpilot



Joined: 28 Aug 2012
Posts: 11
Location: Peachtree City, GA

PostPosted: Sat Dec 08, 2012 4:08 pm    Post subject: Re: HRII Fuel Pump Vent Clearance Reply with quote

Thanks guys! Stuart's solution is certainly the most elegant, but simply removing the fitting would seem to work also, as there should be no fuel coming out of the port if all is well inside the fuel pump. Seems like the only reason to have the drain line is to make it easier to ID the problem and I am sure the FAA required it for certification.

Thanks,
Randy


- The Matronics Rocket-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Rocket-List
Back to top
View user's profile Send private message
denis.walsh(at)comcast.ne
Guest





PostPosted: Sun Dec 09, 2012 7:42 am    Post subject: HRII Fuel Pump Vent Clearance Reply with quote

Hey Randy

I am not a viper pilot but I play one in my dreams frequently. I could say the same about rockets. I can dream anyway.

In the dim reaches of my long term memory, I believe this is a long standing problem. The RV 4 has a clearance problem which sounds like yours to me. If so, Van's has a $9.50 solution. It is: Part Number = F OVERFLOW PLUG 1/8"
Here is a link to the catalog:

http://vansaircraft.com/cgi-bin/store.cgi?ident=1355067275-394-210&browse=engines&product=overflow-fitting
Hope this helps.

Denis
On 8Dec, 2012, at 5:08 , "viperpilot" <nsage86(at)comcast.net> wrote:

Quote:


Thanks guys! Stuart's solution is certainly the most elegant, but simply removing the fitting would seem to work also, as there should be no fuel coming out of the port if all is well inside the fuel pump. Seems like the only reason to have the drain line is to make it easier to ID the problem and I am sure the FAA required it for certification.

Thanks,
Randy




Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=390080#390080












- The Matronics Rocket-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Rocket-List
Back to top
ctlimited(at)hotmail.com
Guest





PostPosted: Sun Dec 09, 2012 8:12 am    Post subject: HRII Fuel Pump Vent Clearance Reply with quote

Denis,That was great, I will be laughing all day about that one, Thanks.
Quote:
Subject: Re: Re: HRII Fuel Pump Vent Clearance
From: denis.walsh(at)comcast.net
Date: Sun, 9 Dec 2012 08:42:21 -0700
To: rocket-list(at)matronics.com

--> Rocket-List message posted by: Denis Walsh <denis.walsh(at)comcast.net>

Hey Randy

I am not a viper pilot but I play one in my dreams frequently. I could say the same about rockets. I can dream anyway.

In the dim reaches of my long term memory, I believe this is a long standing problem. The RV 4 has a clearance problem which sounds like yours to me. If so, Van's has a $9.50 solution. It is: Part Number = F OVERFLOW PLUG 1/8"


Here is a link to the catalog:

http://vansaircraft.com/cgi-bin/store.cgi?ident=1355067275-394-210&browse=engines&product=overflow-fitting


Hope this helps.

Denis
On 8Dec, 2012, at 5:08 , "viperpilot" <nsage86(at)comcast.net> wrote:

> --> Rocket-List message posted by: "viperpilot" <nsage86(at)comcast.net>
>
> Thanks guys! Stuart's solution is certainly the most elegant, but simply removing the fitting would seem to work also, as there should be no fuel coming out of the port if all is well inside the fuel pump. Seems like the only reason to have the drain line is to make it easier to ID the problem and I am sure the FAA required it for certification.
>
> Thanks,
> Randy
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=390080#390080
>
>
>
>
>
>
>
>
>
>


<b=





- The Matronics Rocket-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Rocket-List
Back to top
viperpilot



Joined: 28 Aug 2012
Posts: 11
Location: Peachtree City, GA

PostPosted: Sun Dec 09, 2012 8:24 am    Post subject: Re: HRII Fuel Pump Vent Clearance Reply with quote

Denis! My Man!!

Thanks,
Randy


- The Matronics Rocket-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Rocket-List
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    Matronics Email Lists Forum Index -> Rocket-List All times are GMT - 8 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum


Powered by phpBB © 2001, 2005 phpBB Group