Primary oil level

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Jul 25, 2022 | 02:59 PM

#21

jp0469

Tourer

Joined: Apr 2018

Posts: 297

Likes: 180

From: SE Mass

Quote:

Originally Posted by lp

BTW, Need to move that Red arrow up some so it's touching the Diaphragm spring and not the outer clutch hub.

Well now you're just picking nits. I had to zoom way in to even see the difference. If we're playing that game, there's no such thing as an "outer clutch hub". There's a clutch hub and a clutch shell, which is what you were referring to.

Jul 25, 2022 | 03:03 PM

#22

Seasoned HDF Member

Joined: Jan 2006

Posts: 11,471

Likes: 2,998

From: Charleston, SC

Quote:

Originally Posted by jp0469

Dammit you got me.

Jul 25, 2022 | 03:56 PM

#23

Dan89FLSTC

Seasoned HDF Member

Joined: May 2008

Posts: 21,131

Likes: 12,691

From: South Carolina

In the early years of the diaphragm clutch the service manuals called out an incorrect level, which would result in an over filled primary drive system.

The proper level for all big twins since mid 1984 is: Lube just touching the outer shell of the clutch, bike upright.

Ignore what those early manuals call out.

And a little low isn`t going to hurt a thing.

Last edited by Dan89FLSTC; Jul 25, 2022 at 04:02 PM.

Jul 25, 2022 | 04:36 PM

#24

propflux01

Road Warrior

Joined: May 2007

Posts: 1,434

Likes: 384

From: Arkansastan

I guess the M8 primaries have a smaller capacity. AS the M8 book says 34 oz dry, 30 oz wet, and the twin cams have 38 oz wet, 45 oz dry. Both show the same level as to the clutch.