M8 Oil Control Valve Problems? Really?
HD EFI Guru
Joined: Jan 2008
Posts: 4,494
Likes: 4,780
The new HD cover does not fit onto the earlier transmission, bolt patterns are different. You can however run a line from a modified original cover to the air cleaner but the new HD piece has an oil separator built into it, so you need to add something in the line to prevent the oil fumes getting up to the air filter. A PCV valve or separator can be added to solve that. One needs to remember that the heads are connected to the camchest area via the pushrod tubes. The vent through the modified transmission cover is also connected into the camchest area via a passageway. If you do not handle separating the oil out of the air prior to it entering the air filter you haven't solved anything. As for the S&S drainback valve, its not going to hurt anything and not going to solve anything as long as the OE part isn't broken. So the question has to be how many are breaking, and I haven't heard of any before this thread.
Grand HDF Member
Joined: Jun 2005
Posts: 3,711
Likes: 3,438
From: SW WA.
Now you've done it,I'll have to buy one so I can add the sticker to my locker at work with all the other car and bike parts stickers.
Seasoned HDF Member
Joined: May 2008
Posts: 21,180
Likes: 12,755
From: South Carolina
Seasoned HDF Member
Joined: May 2018
Posts: 5,814
Likes: 7,147
From: Las Vegas
The "expensive aftermarket billet gizmo to get money out of someone`s wallet" retains the trans vent and adds a vent that bleeds off excessive crankcase pressure. It's was so effective on my street glide that I also put one on my Heritage.
Seasoned HDF Member
Joined: Sep 2008
Posts: 14,165
Likes: 11,256
From: San Diego, CA
True....
But it's sort of a vindication that if done correctly, the trans vent is not just snake oil, and actually can work...
Tourer
Joined: Jan 2022
Posts: 318
Likes: 228
From: Ontario
The new HD cover does not fit onto the earlier transmission, bolt patterns are different. You can however run a line from a modified original cover to the air cleaner but the new HD piece has an oil separator built into it, so you need to add something in the line to prevent the oil fumes getting up to the air filter. A PCV valve or separator can be added to solve that. One needs to remember that the heads are connected to the camchest area via the pushrod tubes. The vent through the modified transmission cover is also connected into the camchest area via a passageway. If you do not handle separating the oil out of the air prior to it entering the air filter you haven't solved anything. As for the S&S drainback valve, its not going to hurt anything and not going to solve anything as long as the OE part isn't broken. So the question has to be how many are breaking, and I haven't heard of any before this thread.
I've got one of these fancy new covers on my softail. fit like a glove. all they do is eliminate the two center bolts. even on the 2024's the threaded holes are still there. They just dont use them.
i also have my head breathers plugged with solid bolts. no more oil in the intake.
Seasoned HDF Member
Joined: May 2018
Posts: 5,814
Likes: 7,147
From: Las Vegas
Like everything about a Harley on this forum, Facebook & YouTube - opinions vary. Good marketing fixes a lot of problems that don't exist.
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