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Engine Mechanical TopicsDiscussion for motor builds, cams, head work, stripped bolts and other engine related issues. The good and the bad. If it goes round and around or up and down, post it here.
So I have a 2021 road glide special, 35000 miles. Ive heard of other people having problems with this but havent been able to find the right answer or fix. There is an excessive amount of oil leaking out of the air filter. I have no motor work done, only exhaust and other stuff that doesnt affect it like bars. Any help here would be appreciated thanks.
Is this a recent problem? Or has it been happening from the beginning. Or even worsened gradually? Do you have to add oil between changes? Have you pulled spark plugs on each cylinder to check for excessive carbon build up or signs of it burning oil?
If it is recent, I'd check the oil level in case it is over filled? And even if it is at the correct full level, I'd drop it down about 1/2 a quart and see if the problem improves. I run mine about 1/2 quart low and am not having that issue.
Is this a recent problem? Or has it been happening from the beginning. Or even worsened gradually? Do you have to add oil between changes? Have you pulled spark plugs on each cylinder to check for excessive carbon build up or signs of it burning oil?
If it is recent, I'd check the oil level in case it is over filled? And even if it is at the correct full level, I'd drop it down about 1/2 a quart and see if the problem improves. I run mine about 1/2 quart low and am not having that issue.
Paul
its been a problem for a while. Only time is when it doesnt do that is when I run the oil below the dipstick line.
Hi,
Because the crackcase gases are sucked into the intake, as designed by HD to vent crankcase, that oily mist builds up. With your type of AC, I have the same, when it collects on the air filter it can drip down out the filter. The closed AC just build up inside the casing. Look at other threads for suggestion to go with extrernal breather, catch can or just vent to the atmosphere.
AS others have suggested, running oil 1/2 qt low seems to help the issue.
That amount of oil on the bags is nasty. If you wipe that down completely, how long, how many miles would it take to get back looking like that?
Always. ALWAYS run your oil 1/2 qt. low. This will reduce breather blow-by.
Take off your air cleaner and wipe out the residue on the filter and the intake. (may also want to clean/replace your air filter if that is soaked with oil, too) If no breather bypass is installed, make sure the tubes that run from the breather bolts to the intake opening are there and installed correctly.
If you don't have a brother bypass, look at installing one. Plant of articles on this forum on how to do it.
Always. ALWAYS run your oil 1/2 qt. low. This will reduce breather blow-by.
Take off your air cleaner and wipe out the residue on the filter and the intake. (may also want to clean/replace your air filter if that is soaked with oil, too) If no breather bypass is installed, make sure the tubes that run from the breather bolts to the intake opening are there and installed correctly.
If you don't have a brother breather bypass, look at installing one. Plant of articles on this forum on how to do it.
There was an earlier post about using the 2024 121 CI breather that goes in the trans cover (part# 29400448 to help with venting. It was mentioned that HD eliminated the head breathers in favor of this setup.
Look at Post # 665 in the link below. There was a lot of discussion but most of the breather part is below the post # 665.
The derscription of the individual that made the modification posted "I installed the new engine breather cover assembly (part #29400448, $87.95) from the CVO 121 engine onto my 114 FLHP transmission housing. I used this to create an external breather that is not routed to the engine air intake."
I asked if it would work with earlier M8 engines and got a response that it would. I have not done this yet, but am seriously considering it. Although I'd leave the current head breathers in place.
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Excess oil from air intake
