Oil breather hose size

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kdiqq
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Oil breather hose size

Post by kdiqq »

I'm in the middle of removing the carbs and giving the engine a good cleaning and realized it's a good chance to swap out the two oil breather hoses but I can't get a size off them. Mine are too wallered out to measure and I don't see a stamping. I could guess but wanted to see if anyone knew off the top of their head. Also noticed a LOT of oil in the top of the intake and on the carbs. Anyone had any luck adding a PCV valve or catch can? I know it doesn't prevent oil from venting but I'd like to catch some of it before it recondenses in the carb.

Thanks!

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1977 Austrian 710M
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pcolette
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Re: Oil breather hose size

Post by pcolette »

The parts book says it's 12mm. I always got them from one of the parts vendors, either EI or SAV, since it seems to be a slightly specialized hose and the prices are reasonable.

As long as you're in there it's a good idea to replace the intake balancing hose (01-35-60) since it's often dried out or split and will interfere with getting a smooth idle.
Paul C.
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'73 Swiss 710M
'89 Puch 230GE
gorsko
Bulgaria
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Re: Oil breather hose size

Post by gorsko »

I really struggled to get 12mm hose onto the stubs. Ended up using 18x13mm, which fitted just fine. Measure the stubs if in doubt...
(My supplier sent me the wrong hose - the 12mm i/d size - twice, saying it was 13mm... So now I have 6metres of slightly-too-small hose...did get a full refund tho'!)
1975 712M (AMB)
1993 Defender 90 (200TDi)
1985 Uaz 469B
1982 Luaz 969 "the Russian Haflinger"
kdiqq
United States of America
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Joined: Tue May 26, 2015 3:30 pm
Location: Houston, TX

Re: Oil breather hose size

Post by kdiqq »

I ended up adding the hoses in from SAV when I ordered some other stuff. I dont know what sizes they have, but their hoses are EXTREMELY stiff, small, and difficult to manipulate. I got them on, but it did not come without a fight.
1977 Austrian 710M
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pcolette
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Re: Oil breather hose size

Post by pcolette »

I found that a thin coating of petroleum jelly on each fitting makes it much easier to slide on the hoses. They are stiff but do hold up very well over time.
Paul C.
_________
'73 Swiss 710M
'89 Puch 230GE
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