VansAirForceForums  
Home > VansAirForceForums

- POSTING RULES
- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics

  #1  
Old 01-17-2015, 10:57 AM
Ironflight's Avatar
Ironflight Ironflight is offline
VAF Moderator / Line Boy
 
Join Date: Jan 2005
Location: Dayton, NV
Posts: 11,690
Default Brake piston O-Ring size ?

OK, quick question for all the experts sitting inside with their reference libraries becasue it's too cold to be outside.....

I have found several confilcting sources for the size of the standard Cleveland Brake piston O-ring size, and want to know what others have found. I dont want to taint the results by giving you my numbers, but I can tell youthat if you order from the Aircraft Spruce online catalog, you'll get one that is way too big.

Anyone? Gil?

Paul
__________________
Paul F. Dye
Editor in Chief - KITPLANES Magazine
RV-8 - N188PD - "Valkyrie"
RV-6 (By Marriage) - N164MS - "Mikey"
RV-3B - N13PL - "Tsamsiyu"
A&P, EAA Tech Counselor/Flight Advisor
Dayton Valley Airpark (A34)
http://Ironflight.com
Reply With Quote
  #2  
Old 01-17-2015, 11:01 AM
Mike S's Avatar
Mike S Mike S is offline
Senior Curmudgeon
 
Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 14,280
Default

You might check with Prof. Horton-------seems as I remember him posting an "O" ring chart awhile back------good ones like magic silicon or viton or some such.
__________________
Mike Starkey
VAF 909

Rv-10, N210LM.

Flying as of 12/4/2010

Phase 1 done, 2/4/2011

Sold after 240+ wonderful hours of flight.

"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
Reply With Quote
  #3  
Old 01-17-2015, 11:53 AM
JoeBlank's Avatar
JoeBlank JoeBlank is offline
 
Join Date: Mar 2005
Location: Molalla, Oregon (KOL05)
Posts: 530
Default

Paul,

2-218 for the Cleveland's on the 2-place RV's...

2-222 for the Matcos...

Go to Aceseal.com and buy a dozen. I would also recommend the viton material...
__________________
Joe Blank
RV-6
IO-320-D1A
Advanced Flight Systems

Van's Aircraft Inc. Technical Support-Retired
EAA Tech Counselor & Flight Advisor

www.westcoastravens.com
Reply With Quote
  #4  
Old 01-17-2015, 11:58 AM
Mike S's Avatar
Mike S Mike S is offline
Senior Curmudgeon
 
Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 14,280
Default

Joe, how about the 10??

Got those numbers handy?
__________________
Mike Starkey
VAF 909

Rv-10, N210LM.

Flying as of 12/4/2010

Phase 1 done, 2/4/2011

Sold after 240+ wonderful hours of flight.

"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
Reply With Quote
  #5  
Old 01-17-2015, 12:16 PM
flyingriki's Avatar
flyingriki flyingriki is offline
 
Join Date: Sep 2008
Location: California
Posts: 697
Default

Quote:
Originally Posted by Joe Blank View Post
Paul,

2-218 for the Cleveland's on the 2-place RV's...

2-222 for the Matcos...

Go to Aceseal.com and buy a dozen. I would also recommend the viton material...
Where might we find the number for Grove pistons?
Reply With Quote
  #6  
Old 01-17-2015, 01:34 PM
Ironflight's Avatar
Ironflight Ironflight is offline
VAF Moderator / Line Boy
 
Join Date: Jan 2005
Location: Dayton, NV
Posts: 11,690
Default

Thanks Joe. I've got 2-218's that just seem a little small, and for the second time in a year, I walked out and found a puddle underneath one of the Val's wheels - the leak coming from the piston. I think I'll try a new supplier and see if they have better tolerances.
__________________
Paul F. Dye
Editor in Chief - KITPLANES Magazine
RV-8 - N188PD - "Valkyrie"
RV-6 (By Marriage) - N164MS - "Mikey"
RV-3B - N13PL - "Tsamsiyu"
A&P, EAA Tech Counselor/Flight Advisor
Dayton Valley Airpark (A34)
http://Ironflight.com
Reply With Quote
  #7  
Old 01-17-2015, 02:41 PM
az_gila's Avatar
az_gila az_gila is online now
 
Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 9,614
Smile

Quote:
Originally Posted by Ironflight View Post
Thanks Joe. I've got 2-218's that just seem a little small, and for the second time in a year, I walked out and found a puddle underneath one of the Val's wheels - the leak coming from the piston. I think I'll try a new supplier and see if they have better tolerances.
Buy the part specified by Cleveland which is a MS28775-218 9 (or Cleveland's number 101-02300).

Spruce and the other suppliers sell them.

Perhaps you are seeing the difference between commercial and Mil-Spec part numbers?

Above assumes the Cleveland brake assy is a 30-9.
__________________
Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ

Last edited by az_gila : 01-17-2015 at 03:04 PM.
Reply With Quote
  #8  
Old 01-17-2015, 04:04 PM
Walt's Avatar
Walt Walt is offline
 
Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 4,807
Default

Quote:
Originally Posted by flyingriki View Post
Where might we find the number for Grove pistons?
The Grove PN is: M83248/1-214 for dual piston version, 2 place RV.
__________________
Walt Aronow, Dallas, TX (52F) RV7A, IO360, C/S, 1500+hrs

EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
Reply With Quote
  #9  
Old 01-17-2015, 04:15 PM
BillL BillL is offline
 
Join Date: Sep 2007
Location: Central IL
Posts: 4,446
Default

Quote:
Originally Posted by Ironflight View Post
Thanks Joe. I've got 2-218's that just seem a little small, and for the second time in a year, I walked out and found a puddle underneath one of the Val's wheels - the leak coming from the piston. I think I'll try a new supplier and see if they have better tolerances.
What was the failure mode, Paul? Did you measure the removed o-ring, was it small in ID or in cross section?

What I am wondering is if it got hard, shrank, chipped from excessive clearance or something else. This just seems odd, and recalling some previous investigations, the piston/bore clearance seemed to be excessive for a "precision" aircraft part, and resulted in a circumferential split due to extrusion from braking pressure. In that case a Viton material would improve the situation. Your part is unlikely a repeat, but just asking.

Maybe a new supplier will have better materials.
__________________
Bill

RV-7
1st Flight 1-27-18
Phase II 8-3-18
Reply With Quote
  #10  
Old 01-17-2015, 04:52 PM
John RV8 John RV8 is offline
 
Join Date: Feb 2005
Location: Watauga, TX
Posts: 125
Default

Quote:
Originally Posted by Ironflight View Post
for the second time in a year, I walked out and found a puddle underneath one of the Val's wheels - the leak coming from the piston. I think I'll try a new supplier and see if they have better tolerances.
I hope your leak is just an bad O-ring, I don't think Val is old enough to have the other issue that can cause that leak. Which is pitting in the caliper bore where the O-ring seals. Older brakes that have had moisture in the system tend to develop that problem.
__________________
John Goodloe
RV-8. N6279G
Pay in November
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 10:17 AM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.