Advice needed, Re:blow by
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Stage II
Joined: Sep 2012
Posts: 2
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From: Texas
Advice needed, Re:blow by
I've read all the previous threads about blow by but have yet to find an answer to my problem. I'd appreciate any help I could get. I have an '05 Ultra with a 95" kit. I had no problems for a year then blow by appeared. It's been to the local HD dealer 3 times now. They've had me run it half a quart low, didn't help. They put on the HD Heavy Breather, didn't help. This last time they went nuts and replaced the piston, rings, cylinder, all the seals, gaskets and O rings on the rear cylinder. The front cylinder got new umbrella valves and I still have blow by.
My bike has been in the shop five of the last eight weeks. I really dont think the shop knows what else to do. If you have any ideas I'd love to hear them.
My bike has been in the shop five of the last eight weeks. I really dont think the shop knows what else to do. If you have any ideas I'd love to hear them.
Extreme HDF Member
Joined: Sep 2010
Posts: 14,744
Likes: 402
From: Phoenix '53, '88, '09 Big Twins
welcome to the forums.
while they work on crankcase venting ( in which the umbrella valves in the heads and the breather timing are crucial)
let me ask you this:
does the dripping fluid smell like gas ?
does it only happen if running sustained at specific rpms?
rings ?
hmmm- worn rings will USUALLY demonstrate burning oil ( white smoke) on acceleration ( working on motors 101)
white smoke from the pipe on decel indicates worn valve seals- as does white smoke on start up ( also mechanics 101)
I don't see you bike, so I don't know but I would carefully ask this shop why they are spending YOUR MONEY- and not solving the problem.
do they think if they keep you waiting around long enough...you'll but a 2013?
Mike
while they work on crankcase venting ( in which the umbrella valves in the heads and the breather timing are crucial)
let me ask you this:
does the dripping fluid smell like gas ?
does it only happen if running sustained at specific rpms?
rings ?
hmmm- worn rings will USUALLY demonstrate burning oil ( white smoke) on acceleration ( working on motors 101)
white smoke from the pipe on decel indicates worn valve seals- as does white smoke on start up ( also mechanics 101)
I don't see you bike, so I don't know but I would carefully ask this shop why they are spending YOUR MONEY- and not solving the problem.
do they think if they keep you waiting around long enough...you'll but a 2013?
Mike
Last edited by mkguitar; Sep 4, 2012 at 12:14 PM.
Road Captain
Joined: Oct 2007
Posts: 554
Likes: 4
From: Canada
I had the same problems on my 08 FLHX, I tried everything, no luck!. Then, this past winter I changed my breather and intake to the Vance and Hines V02 Drak. I have put on 20K this past season so far, NOT one drop of blow by. Just my experience.
Thread Starter
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Stage II
Joined: Sep 2012
Posts: 2
Likes: 0
From: Texas
Nope, the oil just smells like oil. As for the pistons and rings I was told they were scored and that I had a compression leak which was allowing oil to gather in the crank case. I've only noticed the blow by on hot days after going more than 100 miles.
Extreme HDF Member
Joined: Sep 2010
Posts: 14,744
Likes: 402
From: Phoenix '53, '88, '09 Big Twins
ok, the first question was to see if this was reversion- so that is ruled out.
as for the scoring, did they show you any worn parts...I dunno about that.
problems with piston seal should have demonstrated white smoke from the exhaust on acceleration
I don't know what to suggest.
really over a barrel here
Mike
as for the scoring, did they show you any worn parts...I dunno about that.
problems with piston seal should have demonstrated white smoke from the exhaust on acceleration
I don't know what to suggest.
really over a barrel here
Mike
Last edited by mkguitar; Sep 4, 2012 at 01:03 PM.
Elite HDF Member
Joined: Nov 2010
Posts: 3,846
Likes: 173
From: Simi Valley, CA
Let me preface this by saying that I never had carry over to the point of oil dripping from my air cleaner, but I did have enough that a little oil would pool inside the air cleaner.
Here's what worked for me... Re-routing the breather ports in the air cleaner backing plate directly into the throttle body. My air cleaner has been dry as a bone ever since I did this mod.
Here's what worked for me... Re-routing the breather ports in the air cleaner backing plate directly into the throttle body. My air cleaner has been dry as a bone ever since I did this mod.
Extreme HDF Member
Joined: Sep 2010
Posts: 14,744
Likes: 402
From: Phoenix '53, '88, '09 Big Twins
nice piece of work ...could see where a little massaging could give a negative pressure like a venturi
mike
mike
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Outstanding HDF Member
Joined: Mar 2008
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From: Everywhere
When rings start to wear, the pressure in combustion chamber will force air past the rings, this air has to escape somewhere and that is thru the crankcase breathers into the air cleaner bringing oil vapor with it resulting in excessive oil drip from air cleaner. A leakdown test will determine if out of spec. Excessively worn rings will allow oil past and burn - have seen cured several of this problem by honing cylinders and replacing rings.. (working on motors 201)
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