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Pete Fowler
Joined: 07 Jul 2009
Posts: 76
Location: California
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 Posted: Mon Feb 22, 2010 7:46 pm Post subject: Two Nanchang mechanical questions |
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1. Is there any trick to replacing the Flap cockpit valve? I have a spare and there appears to be a lot of air leaking out of the one that's installed. Is it a straight swap? Someone mentioned the 90 degree air fittings have to be clocked, is that correct?
2. How do you open the gap on the Chinese spark plugs? They're surprisingly hard metal and without putting any pressure on the delicate center electrode, I don't see an elegant way to pry them open without galling the metal on the outer electrodes (grabbing or hitting them open).
Thanks!
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terrycalloway(at)mac.com
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| Posted: Tue Feb 23, 2010 7:31 am Post subject: Two Nanchang mechanical questions |
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Pete,
This is my experience, I am sure others may have additional advice.
1. Not too bad if you are a dwarf or don't mind standing on your head. Do take the seat out. I did mine last summer and can tell you the trick is when reinstalling the new valve to loosely attach all fittings first. Also be sure to thoroughly clean the threads before going back in the cockpit. Finally the waist bracket on the valve can also remain loose till all air line attachments are secured.
2. There is a tool to do this or I have used a pair of snap ring pliers to open the gap.
Another way to replace the flap valve is to go to and air show with a bunch of RPA members and as soon as you get started trying to replace the valve someone is sure to come around and show you how they would do it.
Then you can just sit back and watch. I recommend you make this move after the last flight of the day that way when you are watching you can also have a beer. 
Good luck.
tc
On Feb 22, 2010, at 9:46 PM, Pete Fowler wrote:
| Quote: |
1. Is there any trick to replacing the Flap cockpit valve? I have a spare and there appears to be a lot of air leaking out of the one that's installed. Is it a straight swap? Someone mentioned the 90 degree air fittings have to be clocked, is that correct?
2. How do you open the gap on the Chinese spark plugs? They're surprisingly hard metal and without putting any pressure on the delicate center electrode, I don't see an elegant way to pry them open without galling the metal on the outer electrodes (grabbing or hitting them open).
Thanks!
--------
N4183E
http://nanchangcjs.yuku.com/
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=287750#287750
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Dabear(at)damned.org
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| Posted: Tue Feb 23, 2010 7:57 am Post subject: Two Nanchang mechanical questions |
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I try that at most every airshow I go to. If I bring the part along, I can
get most of my maintenance done for free over the year....
I get a bad reputation, but I'm cheap.
Just haven't figured out how to get the new fuel tanks installed that
way....
DaBear
Joking y'all, joking
---
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dougsappllc(at)gmail.com
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| Posted: Tue Feb 23, 2010 8:15 am Post subject: Two Nanchang mechanical questions |
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Pete,Before you change it out make sure that you don't have a leaking flap actuator. If there is air moving through the actuator it will vent out of the flap handle. This caution applies to suspected gear valve problems also, always check the actuators first.
Before you remove the valve take a felt marker and make a line across the valve and onto the clamp bracket which hold it. this witness mark will help you when you go to hook up the lines on the new valve.
If your new valve does not have fittings in it and you have to remove the fittings from the old valve you will sometimes have a bit of trouble unless you heat the old valve up a bit.
USE only box end or tube wrenches to remove the fittings.
The Chinese DZ5 plug gap is normally set with a simple go/no go type of tool. There is one in every can of spark plugs. I may have one I'll check, give me a call.
Hope all this helps,
Doug
On Mon, Feb 22, 2010 at 7:46 PM, Pete Fowler <pfdesign1(at)cox.net (pfdesign1(at)cox.net)> wrote:
[quote]--> Yak-List message posted by: "Pete Fowler" <pfdesign1(at)cox.net (pfdesign1(at)cox.net)>
1. Is there any trick to replacing the Flap cockpit valve? I have a spare and there appears to be a lot of air leaking out of the one that's installed. Is it a straight swap? Someone mentioned the 90 degree air fittings have to be clocked, is that correct?
2. How do you open the gap on the Chinese spark plugs? They're surprisingly hard metal and without putting any pressure on the delicate center electrode, I don't see an elegant way to pry them open without galling the metal on the outer electrodes (grabbing or hitting them open).
Thanks!
--------
N4183E
http://nanchangcjs.yuku.com/
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=287750#287750
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N642K
Joined: 23 Jul 2008
Posts: 84
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| Posted: Tue Feb 23, 2010 8:55 am Post subject: Re: Two Nanchang mechanical questions |
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Doug, I don't have the air system schematic in front of me or I could probably answer this myself (ok...probably not). Does the air leak out of both handles with an actuator leak or just one?
Thanks in advance,
Mike DeCanio
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k7wx(at)earthlink.net
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| Posted: Tue Feb 23, 2010 9:23 am Post subject: Two Nanchang mechanical questions |
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Pete,
One other helpful precaution. If you are replacing a valve on the CJ that has multiple B-nut attachments, such as the gear valve, mark, or number the lines. After the valve is off, it may not be obvious which line goes to which connection. Switching lines is not that hard to do, especially for the aft cockpit gear valve.
And before you place into service a valve, take a few extra minutes to clean up the threads. Makes it a little easier to hand tighten for the first few turns before placing a wrench.
Warren Hill
N867PA
On Feb 22, 2010, at 8:46 PM, Pete Fowler wrote:
| Quote: |
1. Is there any trick to replacing the Flap cockpit valve? I have a spare and there appears to be a lot of air leaking out of the one that's installed. Is it a straight swap? Someone mentioned the 90 degree air fittings have to be clocked, is that correct?
2. How do you open the gap on the Chinese spark plugs? They're surprisingly hard metal and without putting any pressure on the delicate center electrode, I don't see an elegant way to pry them open without galling the metal on the outer electrodes (grabbing or hitting them open).
Thanks!
--------
N4183E
http://nanchangcjs.yuku.com/
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=287750#287750
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dougsappllc(at)gmail.com
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| Posted: Tue Feb 23, 2010 10:04 am Post subject: Two Nanchang mechanical questions |
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I honestly don't know without a bunch of study, my first knee jerk response would be "that would depend on the position of the rear valve handle", but would have to give is some more thought.
Doug
On Tue, Feb 23, 2010 at 8:55 AM, N642K <mdecanio(at)mac.com (mdecanio(at)mac.com)> wrote:
[quote] --> Yak-List message posted by: "N642K" <mdecanio(at)mac.com (mdecanio(at)mac.com)>
Doug, I don't have the air system schematic in front of me or I could probably answer this myself (ok...probably not). Does the air leak out of both handles with an actuator leak or just one?
Thanks in advance,
Mike DeCanio
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=287831#287831
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