Copper breather hose size - BMW Luxury Touring Community
 
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post #1 of 7 Old Jan 13th, 2019, 9:39 am Thread Starter
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Copper breather hose size

Has anybody had any problems with using 1/2 copper pipe instead of 3/8 ? I am having a hard time finding 3/8 and have a pile 1/2 any for the homemade version . I got her tore down and plan on doing hoses, rubber sleeves, O rings that go under the sleeves, go O rings for the injectors, gas lines . Am I missing anything else that should be done in there? Thanks for help
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post #2 of 7 Old Jan 13th, 2019, 1:12 pm
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Re: Copper breather hose size

Viking True Value Hardware, Ace will have 3/8" copper tubing (not pipe). They may have pipe work house work but tubing will work just fine and is easier to work with.

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post #3 of 7 Old Jan 13th, 2019, 2:17 pm
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Re: Copper breather hose size

I made mine out of an aluminum block and used individual rubber hoses. Works great. There are pictures in the archives.

Robert

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post #4 of 7 Old Jan 13th, 2019, 2:55 pm
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Re: Copper breather hose size

Several have done the DIY with varying supplies in 1/2, 3/8 tubing and also the 1in block stubby type. There is more than one way to skin that cat. Several threads below.

https://www.bmwlt.com/forums/k1200lt...ntilation.html


https://www.bmwlt.com/forums/k1200lt...placement.html


https://www.bmwlt.com/forums/k1200lt...-manifold.html

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2001 K1200LTI – Champagne (current ride) Lazy Susan
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post #5 of 7 Old Jan 13th, 2019, 4:19 pm
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Re: Copper breather hose size

FWIW I pressure tested my breather on my first clutch job (50 K) and found a crack at the junction of the main body to the breather port (red circle). I cleaned it up and held it open while I applied Black Auto door seal adhesive. Let it cure and rechecked and there was no more leaks. I just rechecked the breather while I have the cylinder head off for a re-ring and found no leaks (110 K). How bad are the ones everyone is replacing?
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post #6 of 7 Old Jan 13th, 2019, 5:12 pm
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Re: Copper breather hose size

Quote:
Originally Posted by jonny65 View Post
Has anybody had any problems with using 1/2 copper pipe instead of 3/8 ?
...Thanks for help
I used half inch copper pipe and soldered brass hose fittings for the individual manifolds. I had an oily mess and rough idle which disappeared after replacing the breather tube which was cracked in multiple places when I purchased the KLT with 47k miles on it.
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post #7 of 7 Old Jan 13th, 2019, 5:21 pm
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Re: Copper breather hose size

Quote:
Originally Posted by jzeiler View Post
FWIW I pressure tested my breather on my first clutch job (50 K) and found a crack at the junction of the main body to the breather port (red circle). I cleaned it up and held it open while I applied Black Auto door seal adhesive. Let it cure and rechecked and there was no more leaks. I just rechecked the breather while I have the cylinder head off for a re-ring and found no leaks (110 K). How bad are the ones everyone is replacing?
Mine was cracked around the 4 hose nipples on the cross tube. I still have it and will look for better pictures as this is the only one I have that shows the cracks. I think 3 of the 4 but would have to find it again to be sure.
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Gordon
Sugar Hill, GA
2001 K1200LTI – Champagne (current ride) Lazy Susan
1998 R1100RT – Never should have sold it
1974 Yamaha TX 750 Twin. Omni Phase Balanced


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