Today's Message Index:
----------------------
1. 02:21 PM - HRII Fuel Pump Vent Clearance (viperpilot)
2. 03:27 PM - Re: HRII Fuel Pump Vent Clearance (Stuart Hutchison)
3. 03:29 PM - Re: HRII Fuel Pump Vent Clearance (Hr2pilot)
4. 04:08 PM - Re: HRII Fuel Pump Vent Clearance (viperpilot)
Message 1
| INDEX | Back to Main INDEX |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | HRII Fuel Pump Vent Clearance |
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
Message 2
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | HRII Fuel Pump Vent Clearance |
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
-----Original Message-----
From: owner-rocket-list-server@matronics.com
[mailto:owner-rocket-list-server@matronics.com] On Behalf Of viperpilot
Sent: Sunday, December 09, 2012 9:21 AM
Subject: Rocket-List: HRII Fuel Pump Vent Clearance
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
Message 3
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: HRII Fuel Pump Vent Clearance |
Do away with the fitting
Sent from my iPhone
On Dec 8, 2012, at 2:20 PM, "viperpilot" <nsage86@comcast.net> wrote:
>
> 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
>
>
>
>
>
>
>
>
>
>
Message 4
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: HRII Fuel Pump Vent Clearance |
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
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|