Help identifying O-rings (AN to MS conversion)

[RLCarter]

In the process of doing my annual, the right master cylinder shows signs of leaking (sticky 5606 on the shaft and body) so I'm wanting to rebuild both master cylinders and both calipers. Also the 4 bolts that hold the calipers together look like they have been R&R'ed several times with crap tools (screwed up heads). The O-Ring part #'s I have do not show up and I assume they have superseded to the new "MS" numbers, the 4 bolts seem to short overall. Can someone point me to a conversion chart? Also could you check your parts manual on the bolt size?

1965 M20 E  ser# 578

AN6227-3     O-ring

AN6227-5     O-ring

AN6227-9     O-ring

AN6227-10   O-ring

AN6227-29   O-ring

AN4-6A        Bolt

   

 

 

 

 

 

Edited September 8, 2021 by RLCarter

[mike20papa]

https://www.aircraftspruce.com/catalog/appages/orings.php?clickkey=3008697

This should help.

[PT20J]

More than I wanted to know…

https://www.goodyearrubberproducts.com/2010newpdfs/APG_O-ring_Catalog2010.pdf

[JoeM]

Plane parts has the master cyl overhaul kits. Bill Goetschel overhauls the master cylinder and can replace the seal for about $200. 507-581-9761 

[RLCarter]

1 hour ago, mike20papa said:

https://www.aircraftspruce.com/catalog/appages/orings.php?clickkey=3008697

This should help.

I saw that…. AN6227B-29 for example….what does the B signify, original numbers don’t have the “B”?

[Guest]

From the Cleveland manual.  The O rings as noted are now MS28775 series.

Clarence

 

[RLCarter]

Thanks guys , I’ll educate my self on the new #’s, odd that my parts manual shows a -4 bolt and they are a -5 as shown by  The illustration @M20Doc posted 

 

[Guest]

Bolt head size should be give away as to bolt shank size.  I’m sure that they are AN 5 

Clarence

[RLCarter]

@M20Doc you are correct went out to the hangar and removed  one of the bolts, and it is an AN5-H14A. Placed 4 new bolts in my Spruce shopping cart, a whooping $4.36, which is probably more than wrench cost that someone used prior to me 

[Yetti]

a Bit of overkill  https://ceetak.com/files/downloads/parker-catalogues/parker-o-ring-handbookptd5705-en.pdf