V-Rod Breather Hose Question - Harley Davidson Forums: Harley Davidson Motorcycle Forum
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post #1 of 13 (permalink) Old 10-01-2011, 08:21 AM Thread Starter
JRX
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V-Rod Breather Hose Question

Hi....My '08 Night Rod Special (~16k miles) was leaking a lot of oil on my last ride (about a half quart in 100 miles). Was coming from a place high in the engine - in the area between the cylinders just under the plastic "floor" panel of the airbox. Its a little hard to tell the exact source because it was spraying all over that area. But when I removed that airbox bottom panel i noticed that the metal front breather tube (attached to the airbox floor) simply slides into a hole in the top of the engine - there was no o-ring to help seal that connection and it seems to me that maybe there should be?

Thoughts? Or perhaps the breather system is clogged somehow?

Thanks for any insights!
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post #2 of 13 (permalink) Old 10-01-2011, 09:37 AM
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I do have trouble with a rubber breather hose on my 05 B-Rod, I have replaced

a rubber vent hose 3 times, and it blows a lot of oil when it is cracked, but mine must be

made differently in that regard, mine is from the rear valve cover to the airbox, into an oil separator

in the airbox located about where you're referring to, but I don't have a metal pipe thereabouts.

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post #3 of 13 (permalink) Old 10-01-2011, 10:59 AM Thread Starter
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Thanks for the info! On mine there are two such vent lines to the airbox, one from the rear (similar to the pic you posted). I (hope) attached a photo of the bottom of the airbox showing the two lines. I didnt see any cracks in the rubber.
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post #4 of 13 (permalink) Old 10-01-2011, 11:32 AM
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Hmm maybe I do have something like, ......

....doh! I have the book.. let me look..


Google image search rocks..

I'd be looking for whatever they are calling "the mating vent tube boss mounted in the front cylinder head"



Quote:
The brass breather in the pic is inverted. The rifled end of the hose goes over the tapered end of the breather and the other end feeds into the airbox and connects to a tube on that weird central tower? What in the hell is that supposed to do?

If anyone has their airbox off, I would really appreciate a picture of the rear breather hose.
Quote:
What you're showing is the 2008 updated front breather tube (29504-05A) that will retrofit back to 2005. This version and the one it replaces (29504-05) are tubes with 90 elbows but the part that exits the airbox points straight down. To use these breather tubes on an early model VRSC (pre 2005) you need the updated lower airbox (29435-05) and the mating vent tube boss mounted in the front cylinder head.

The hose bproulxvrod was referring to is the earlier pre-2005 version (29501-01). This early front breather tube is straight.

I attached a picture showing both the early and late breather tubes.

http://www.1130cc.com/forums/attachm...4&d=1268414129

http://www.1130cc.com/forums/showthread.php?t=134870



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post #5 of 13 (permalink) Old 10-01-2011, 08:09 PM Thread Starter
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Hey Nathang...thanks for that bit of research! It sure does seem like there is an O-ring missing from my breather tube. If so, it's kind of strange that I've put a couple thousand miles on it and only now does it decide to spew oil. Perhaps the tube had a decent interference fit into the head even without the O-ring, and just vibrated a little loose over time.
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post #6 of 13 (permalink) Old 10-18-2011, 08:06 PM Thread Starter
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Update...I installed the breather hose o-ring, and after re-assembling everything was able to ride the bike a short time. After that I still saw some oil trail on the engine side suggesting that maybe it was still leaking, or maybe that was only from leftover pools of previously-leaked oil in engine recesses. Couldnt really tell after taking the airbox assy off again, but there did seem to be some evidence of further leaking.
Question: The manual seems to indicate that a clogged breather system could cause an oil leak - anybody ever have that happen? For that matter- how would I clean the breather?
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post #7 of 13 (permalink) Old 10-24-2011, 07:50 PM Thread Starter
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Update... it indeed was the missing breather tube O-ring that was causing the problem. I found that you just have to be sure that the brass breather tube is not pushed too far up towards the airbox (the tube can slide within the airbox rubber fitting, which appears to prevent the tube's other end / o-ring from properly inserting into the engine hole).
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post #8 of 13 (permalink) Old 12-23-2015, 10:23 PM
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vrodnp

I just thought I would share my experience with an oil leak on my 2011 vrod muscle. I could of swore that I had a head gasket leak it looked like it was dripping right from the seem where the cylinders meet the block on the right side. I cleaned it up and went for another short ride and there it was again. I started doing some research on vrod oil leaks and a lot of people stood by the revo engine said shouldn't leak. I then did some more research and found a you tube video on a oil change on a vrod there was on thing on the video that stood out to me and that was the amount of oil I should of put in while the bike was cold. I pulled out my manual the manual said that the oil level should be half way up or a little less on the cross hatch markings on the dip stick. Not being that experienced with working on bikes I was pretty sure this might have something to do with my oil leak. I pulled the air box off and found a good sized puddle of oil on the floor of the filter box. I cleaned every thing out with degreaser and rags, and blew out the breather valve as best as I could. I also ended up having to drain about a 1/2 quart of oil out of the pan. I put everything back together and went for a 20 min cruise on freeway, came back and did a thorough inspection on the bike I even took the air box cover back off. No oil anywhere not even a speck. For those of you who are experienced with bike repair this may seem like a no brainer. I seem to learn everything the hard way. I know now that with the manual says 5 quart capacity it is not necessarily 5 quarts it may be quite a bit less. The moral of the story things might not look as it seems. The oil leak that I saw looked just like a head gasket leak, it really looked like it was running out of the head gasket but in reality it was running down from above, down between the cylinder (which is hard to see) and then followed the angled ridge along the head gasket. I am so happy it was an easy fix did not cost me anything (although I probably will replace the breather valve). I find these forums helpful and may save some us from having to spend big $$$$$$$$ at the HD dealer. Have a great Christmas I just received my present I am back on the road!!!!!!!!!!!!!!!!!
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post #9 of 13 (permalink) Old 12-24-2015, 07:37 PM
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Quote:
Originally Posted by JRX View Post
Update... it indeed was the missing breather tube O-ring that was causing the problem. I found that you just have to be sure that the brass breather tube is not pushed too far up towards the airbox (the tube can slide within the airbox rubber fitting, which appears to prevent the tube's other end / o-ring from properly inserting into the engine hole).
The proper method for installing the breather tube is to insert the brass tube fitting into its hole in the engine. It should "snap" into place if the O-ring is fitted properly and not be easily removable. Then place the air boxes rubber tube over the brass tube. It's a little tricky to see it being placed properly but can be done.

Regards,

John
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post #10 of 13 (permalink) Old 01-02-2016, 08:04 PM
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Yes Rusty you are correct, When ever removing the air box base then reinstalling you must insert the tube into the valve cover first. Another common leak is the rear breather hose that Nathang was talking about. It will dry up over time due to the heat from the rear cylinder area. The one only other issue with minor leakage would be the lower air box base gasket. This gasket tears easy so watch out for this one as well.
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