Blow by on 2007 FLHTC
Road Master
Joined: Nov 2008
Posts: 1,066
Likes: 4
From: Central Coast CA
Don't over fill oil. Put 3.25 quarts in warm it up and top off until the full at hot line. Should end up with a little over 3.5 qts. So much is left in cam chest that many overfill by just putting in all 4 qts.
Road Master
Joined: Jul 2006
Posts: 862
Likes: 1
From: Western PA
First you need to find out why your getting blow by. Read your plugs, do a compression test, make sure crank case is not overfull. how much oil are you using?
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Cruiser
Joined: Dec 2006
Posts: 170
Likes: 1
From: Monroeville, Pa.
plugs are a nice light brown color, compression is great, I use no oil and I do my own maintenence and never overfill the crankcase. Bike has Vance and Hines fuel pak, K&N airbox and V&H slipon pipes - all properly tuned.
Road Warrior
Joined: Jun 2009
Posts: 1,943
Likes: 3
From: NYC
so what's the problem.....you are not consuming oil...why are you calling this blow by?
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Cruiser
Joined: Dec 2006
Posts: 170
Likes: 1
From: Monroeville, Pa.
small drips of oil on motor under air cleaner as well as on the seat, saddlebag ,pipes and my wife's leg. This is not blow by ???
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Road Captain
Joined: Oct 2007
Posts: 554
Likes: 4
From: Canada
I had the same problem with my 08 FLHX. I tried draining a bit of oil as mentioned , it started getting worse as time went on. As it turns out, the umbrella seals were shot, replaced under warranty. Fairly big job I was told, your rocker boxes have to be removed, the seals are located under there.
Road Warrior
Joined: Jun 2009
Posts: 1,943
Likes: 3
From: NYC
nope...not at all....your getting oil from your case vents into your intake. The case vents are designed to return uncombusted fuel that accumilates in the engine case and routes that fuel vapor into your intake for a 2nd chance at getting it burned.
your getting oil in the line from the case vents due to an overfilled crank case. Drop the level a half a quart.
blow by is when oil gets passed the oil rings on the piston and enters the cumbustion chamber and you consume oil that normally gets sent back to the case by the oil rings on the piston.