Re: PT-19 Goodyear master cylinder problem

[Ranchaero Wing Shop]

'I have partly disassembled my deviant master cylinder. Fluid is not
passing through the unit but seems blocked internally. I've removed the
elbow at the inlet port and can see a small hole way at the rear of the
port that should be passing fluid through but isn't. I am guessing that
either there something blocking the piston from retracting all the way
such as the piston stop or seal, or some other mis-positioning
situation. This cylinder is labeled "rebuilt" and is clean, so I don't
suspect gunk. I have the parts manual, but is there any other manual
offering more detailed assembly instructions for this master cylinder?

Also, is there a source for parts for this cylinder?

David


---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus'

[Seifert]

'Hello DaveAre you sure you have the correct piston in your master cylinder.  It may have been replaced with the piston that comes in the NAPA rebuild kit.  You must use the old piston and valve assy for it to work.The old piston is 1-9/16" long.  The NAPA piston is 2-3/16" long and will not work with the M/S used on Fairchild 24's

On Mon, Jul 18, 2016 at 6:21 PM, Ranchaero Wing Shop david@ranchaerowingshop.com [fairchildclub] wrote:
 
I have partly disassembled my deviant master cylinder. Fluid is not
passing through the unit but seems blocked internally. I've removed the
elbow at the inlet port and can see a small hole way at the rear of the
port that should be passing fluid through but isn't. I am guessing that
either there something blocking the piston from retracting all the way
such as the piston stop or seal, or some other mis-positioning
situation. This cylinder is labeled "rebuilt" and is clean, so I don't
suspect gunk. I have the parts manual, but is there any other manual
offering more detailed assembly instructions for this master cylinder?

Also, is there a source for parts for this cylinder?

David

---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus

'

[Ranchaero Wing Shop]

' Richard,
Thanks for your help. To answer: No, I am not sure I have the correct piston. This MS came with the project and is marked "rebuilt," but I have no way to know what parts were used. This is a PT-19, not a a '24. I can't figure out how to get the back of the unit off to allow removal of the piston. I removed the rotor clip ring but the piston does not come out the back of the unit. I can't see what's preventing it from coming out. The rear of the unit looks like it should thread out the back but I don't know how I would turn it. I gingerly tried pliers with a rag around it but didn't want to ruin it so didn't try very hard. Perhaps there's a special tool for that?

You mention the difference in length of the pistons. That certainly could explain why fluid is not passing through the unit. Once I figure out how to remove the piston, I can check the length. You mentioned this for the '24's. Does this also apply to the PT-19?

David

On 7/19/2016 5:36 PM, Richard Seifert 1936f24h@gmail.com [fairchildclub] wrote:

  Hello Dave Are you sure you have the correct piston in your master cylinder.  It may have been replaced with the piston that comes in the NAPA rebuild kit.  You must use the old piston and valve assy for it to work. The old piston is 1-9/16" long.  The NAPA piston is 2-3/16" long and will not work with the M/S used on Fairchild 24's
On Mon, Jul 18, 2016 at 6:21 PM, Ranchaero Wing Shop david@ranchaerowingshop.com [fairchildclub] wrote:
 
I have partly disassembled my deviant master cylinder. Fluid is not
passing through the unit but seems blocked internally. I've removed the
elbow at the inlet port and can see a small hole way at the rear of the
port that should be passing fluid through but isn't. I am guessing that
either there something blocking the piston from retracting all the way
such as the piston stop or seal, or some other mis-positioning
situation. This cylinder is labeled "rebuilt" and is clean, so I don't
suspect gunk. I have the parts manual, but is there any other manual
offering more detailed assembly instructions for this master cylinder?

Also, is there a source for parts for this cylinder?

David

---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus

This email has been checked for viruses by Avast antivirus software.
www.avast.com
'

[1936f24h]

' Hi DavidI think the PT's used a different master.  I don't have any info on that cylinder, sorry.  Shurely someone on the list can help. Good luck.


Sent from my Verizon Wireless 4G LTE smartphone

-------- Original message --------
From: "Ranchaero Wing Shop david@ranchaerowingshop.com [fairchildclub]"
Date: 07/19/2016 9:03 PM (GMT-08:00)
To: fairchildclub@yahoogroups.com
Subject: Re: [fairchildclub] PT-19 Goodyear master cylinder problem

 
Richard,
Thanks for your help. To answer: No, I am not sure I have the correct piston. This MS came with the project and is marked "rebuilt," but I have no way to know what parts were used. This is a PT-19, not a a '24. I can't figure out how to get the back of the unit off to allow removal of the piston. I removed the rotor clip ring but the piston does not come out the back of the unit. I can't see what's preventing it from coming out. The rear of the unit looks like it should thread out the back but I don't know how I would turn it. I gingerly tried pliers with a rag around it but didn't want to ruin it so didn't try very hard. Perhaps there's a special tool for that?

You mention the difference in length of the pistons. That certainly could explain why fluid is not passing through the unit. Once I figure out how to remove the piston, I can check the length. You mentioned this for the '24's. Does this also apply to the PT-19?

David

On 7/19/2016 5:36 PM, Richard Seifert 1936f24h@gmail.com [fairchildclub] wrote:

  Hello Dave Are you sure you have the correct piston in your master cylinder.  It may have been replaced with the piston that comes in the NAPA rebuild kit.  You must use the old piston and valve assy for it to work. The old piston is 1-9/16" long.  The NAPA piston is 2-3/16" long and will not work with the M/S used on Fairchild 24's
On Mon, Jul 18, 2016 at 6:21 PM, Ranchaero Wing Shop david@ranchaerowingshop.com [fairchildclub] wrote:
 
I have partly disassembled my deviant master cylinder. Fluid is not
passing through the unit but seems blocked internally. I've removed the
elbow at the inlet port and can see a small hole way at the rear of the
port that should be passing fluid through but isn't. I am guessing that
either there something blocking the piston from retracting all the way
such as the piston stop or seal, or some other mis-positioning
situation. This cylinder is labeled "rebuilt" and is clean, so I don't
suspect gunk. I have the parts manual, but is there any other manual
offering more detailed assembly instructions for this master cylinder?

Also, is there a source for parts for this cylinder?

David

---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus

This email has been checked for viruses by Avast antivirus software.
www.avast.com

Posted by: Ranchaero Wing Shop Reply via web post • david@ranchaerowingshop.com?subject=Re%3A%20%5Bfairchildclub%5D%20PT-19%20Goodyear%20master%20cylinder%20problem • fairchildclub@yahoogroups.com?subject=Re%3A%20%5Bfairchildclub%5D%20PT-19%20Goodyear%20master%20cylinder%20problem • Start a New Topic • Messages in this topic (3) Save time and get your email on the go with the Yahoo Mail app Get the beautifully designed, lighting fast, and easy-to-use Yahoo Mail today. Now you can access all your inboxes (Gmail, Outlook, AOL and more) in one place. Never delete an email again with 1000GB of free cloud storage. '