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1991 U1250 2002 U500NA
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4,040 Posts
Discussion Starter · #1 ·
I thought I share this little upgrade.

Spending lately lots of time and money on air system
I bumped into little obstacle while resembling steel air lines.
By every device, like 4-way valve, limiting valve,check valve etc.
there is a tightening nut or two, brass ring and O-ring all together
to seal the connection.They're everywhere.
Now when you put everything back together you may apply
just little to much force on the brass ring and it will crack.
Now you have to take it all apart to get back to that ring and O-ring.
During replacing 4-way valve I cracked 2 of them.
Well, instead of using those rings and O-rings, which I found to be
very weak spot, you can get so called compound seal.
And it comes metric !
With this you will save yourself quite a bit of grief and time.
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85' U1300L Holset Turbo VA A/C, 66' Propane 404.1 rock mog, 1975 416 Doka, G500, Volvo C303
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5,844 Posts
Though those bonded seals are an upgrade, all those seals should just be brass rings only without o rings. At least so far as I have experienced.
 

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1988 Mercedes Benz U1300L OM366, fast axles
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244 Posts

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U1600AG + a LR 90
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1,002 Posts
I believe that is the same as a Dowty seal commonly used in hydraulic applications. Correct? Pretty easy to come by.
Dowty washer/seal = bonded washer/seal

Its much like using the trade name/mark of the inventor in the naming of the item, other manufactures prefer to use “bonded washer” as the item description to elude the Dowty name.

They also work well on fuel systems where you may have to bleed air after filter changes provided you use bolts/etc with slightly larger head to give a larger annular area than you may use with just a copper/etc washer, or in normal fuel pipe threaded joints.
 
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