Too much Crankcase pressure?
Thread Starter
|
Cruiser
Joined: Nov 2012
Posts: 231
Likes: 2
From: Ontario, Canada.
Too much Crankcase pressure?
Is it possible to have too much crankcase pressure?, and if so, what are some of the causes?.
My 07 sportster seems to blow a lot of oil, even from new the stock filter was always getting to be an oil soaked mess.
Today when I was double checking a few things I noticed that my breather bolts have backed out ,and are now on the highway somewhere.
A week ago when I checked, everything looked good.
I'm constantly wiping oil film off this bike after a ride and I have had the oil levels set in different places between the full and low lines, it makes no difference.
I'm currently running a Hammer performance breather backing plate with 2" K&N filter and the Ham can, with DK Customs breather bolts, Rinehart exhaust and Xieds.
Currently the front rocker box is leaking.
My 07 sportster seems to blow a lot of oil, even from new the stock filter was always getting to be an oil soaked mess.
Today when I was double checking a few things I noticed that my breather bolts have backed out ,and are now on the highway somewhere.
A week ago when I checked, everything looked good.
I'm constantly wiping oil film off this bike after a ride and I have had the oil levels set in different places between the full and low lines, it makes no difference.
I'm currently running a Hammer performance breather backing plate with 2" K&N filter and the Ham can, with DK Customs breather bolts, Rinehart exhaust and Xieds.
Currently the front rocker box is leaking.
Cruiser
Joined: Sep 2015
Posts: 123
Likes: 3
From: Kentucky
You can have too much crankcase pressure, this would be caused by the ventilation system being plugged up.
If your breather bolts were to get plugged up/gummed up it can cause that rocker gasket leak, the engine is gonna breath somewhere, even if its through some old rocker gaskets, that must have been the weakest place for the pressure to escape. Since you no longer have the breather bolts, I'd put the factory stuff back on until you can replace your aftermarket breather bolts Also, make double sure that your oil isn't over filled. The oil on your bike is totally normal without the breather bolts installed, all engines need to breath, its just that most of them vent back into the intake air stream so that you never even notice that it's happening. Just for curiosity's sake, crank up your bike and feel if there is a lot of air coming from the open holes where your breather bolts were, you should feel a nice rush of air when you twist the throttle. Really doesn't sound like anything to be worried about.
On my 2015 Iron, at around 500 miles I took the air filter off just to look inside and there was a shiny streak where oil was being sucked into the throttle body from the breather hoses. You can safely clean this while the bike is running by spraying some carb cleaner into the throttle opening while twisting the throttle to keep the bike running. It won't take much.
I would just clean the K&N, replace the rocker gasket and breather bolts, and check the oil level again.
If your breather bolts were to get plugged up/gummed up it can cause that rocker gasket leak, the engine is gonna breath somewhere, even if its through some old rocker gaskets, that must have been the weakest place for the pressure to escape. Since you no longer have the breather bolts, I'd put the factory stuff back on until you can replace your aftermarket breather bolts Also, make double sure that your oil isn't over filled. The oil on your bike is totally normal without the breather bolts installed, all engines need to breath, its just that most of them vent back into the intake air stream so that you never even notice that it's happening. Just for curiosity's sake, crank up your bike and feel if there is a lot of air coming from the open holes where your breather bolts were, you should feel a nice rush of air when you twist the throttle. Really doesn't sound like anything to be worried about.
On my 2015 Iron, at around 500 miles I took the air filter off just to look inside and there was a shiny streak where oil was being sucked into the throttle body from the breather hoses. You can safely clean this while the bike is running by spraying some carb cleaner into the throttle opening while twisting the throttle to keep the bike running. It won't take much.
I would just clean the K&N, replace the rocker gasket and breather bolts, and check the oil level again.
Is it possible to have too much crankcase pressure?, and if so, what are some of the causes?.
My 07 sportster seems to blow a lot of oil, even from new the stock filter was always getting to be an oil soaked mess.
Today when I was double checking a few things I noticed that my breather bolts have backed out ,and are now on the highway somewhere.
A week ago when I checked, everything looked good.
I'm constantly wiping oil film off this bike after a ride and I have had the oil levels set in different places between the full and low lines, it makes no difference.
I'm currently running a Hammer performance breather backing plate with 2" K&N filter and the Ham can, with DK Customs breather bolts, Rinehart exhaust and Xieds.
Currently the front rocker box is leaking.
My 07 sportster seems to blow a lot of oil, even from new the stock filter was always getting to be an oil soaked mess.
Today when I was double checking a few things I noticed that my breather bolts have backed out ,and are now on the highway somewhere.
A week ago when I checked, everything looked good.
I'm constantly wiping oil film off this bike after a ride and I have had the oil levels set in different places between the full and low lines, it makes no difference.
I'm currently running a Hammer performance breather backing plate with 2" K&N filter and the Ham can, with DK Customs breather bolts, Rinehart exhaust and Xieds.
Currently the front rocker box is leaking.
The most common reason for excessive crankcase pressure is that the oil is at, or above the top mark on the dipstick.
The HD manual states-
"The correct oil level should register midway between the FULL and ADD marks on the dipstick.
If oil level is at or below the ADD mark, add only enough oil to bring the level to the middle of the two marks on the dipstick."
Of course, this is confusing because HD refers to the top mark as "Full" when in reality, they say in the same sentence that midway between the two marks is full. Typical. lol
Another way it can get overfilled is that the checkvalve that is supposed to keep the oil in the tank when it is sitting, doesn't always do its' job.
The engine should be started, run for at least a minute, then shut down. Wait a 30 seconds then check the oil.
Just last week we had a guy that added almost a quart of oil to his Sportster because it was "low". Well, the bike had been sitting for about a week when he checked the oil.
After he added the quart, then started it, then checked it again, it was almost overflowing out of the top of the oil tank.
If you're sure your oil is at the midway point between the top and bottom marks, then there are a few other things that can cause problems. There is a good thread on it here-
https://www.hdforums.com/forum/oil-a...f-my-bike.html
__________________
DKCustomProducts.com
DKCustomProducts.com
Intermediate
Joined: Aug 2015
Posts: 47
Likes: 0
From: San Francisco
The most common reason for excessive crankcase pressure is that the oil is at, or above the top mark on the dipstick.
The HD manual states-
"The correct oil level should register midway between the FULL and ADD marks on the dipstick.
If oil level is at or below the ADD mark, add only enough oil to bring the level to the middle of the two marks on the dipstick."
Of course, this is confusing because HD refers to the top mark as "Full" when in reality, they say in the same sentence that midway between the two marks is full. Typical. lol
Another way it can get overfilled is that the checkvalve that is supposed to keep the oil in the tank when it is sitting, doesn't always do its' job.
The engine should be started, run for at least a minute, then shut down. Wait a 30 seconds then check the oil.
Just last week we had a guy that added almost a quart of oil to his Sportster because it was "low". Well, the bike had been sitting for about a week when he checked the oil.
After he added the quart, then started it, then checked it again, it was almost overflowing out of the top of the oil tank.
If you're sure your oil is at the midway point between the top and bottom marks, then there are a few other things that can cause problems. There is a good thread on it here-
https://www.hdforums.com/forum/oil-a...f-my-bike.html
The HD manual states-
"The correct oil level should register midway between the FULL and ADD marks on the dipstick.
If oil level is at or below the ADD mark, add only enough oil to bring the level to the middle of the two marks on the dipstick."
Of course, this is confusing because HD refers to the top mark as "Full" when in reality, they say in the same sentence that midway between the two marks is full. Typical. lol
Another way it can get overfilled is that the checkvalve that is supposed to keep the oil in the tank when it is sitting, doesn't always do its' job.
The engine should be started, run for at least a minute, then shut down. Wait a 30 seconds then check the oil.
Just last week we had a guy that added almost a quart of oil to his Sportster because it was "low". Well, the bike had been sitting for about a week when he checked the oil.
After he added the quart, then started it, then checked it again, it was almost overflowing out of the top of the oil tank.
If you're sure your oil is at the midway point between the top and bottom marks, then there are a few other things that can cause problems. There is a good thread on it here-
https://www.hdforums.com/forum/oil-a...f-my-bike.html
When I installed my arlen ness inverted intake, I was spitting out oil from the breather, and my mechanic said I had too much oil. He suggested I fill the oil tank half way, which Harley recommends. I haven't noticed oil dripping from my intake since.
Thread
Thread Starter
Forum
Replies
Last Post
