Author Topic: M8 trans fluid leaking in primary  (Read 36111 times)

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Offline stro1965

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Re: M8 trans fluid leaking in primary
« Reply #750 on: December 04, 2017, 06:14:22 PM »
Add me to the list of folks seeing oil migrate from the transmission to the primary. Just 400 miles after the 1K service on my '17 I decided to have a look. The dipstick was dry and the primary was overflowing. I'm estimating that about 8 ounces migrated over in just 400 miles. Now, that said, I don't ride this bike like most folks do. This Road King was purchased almost exclusively as a cone competition bike, and I'm on that clutch all the time. Definitely gets ridden like a cop bike. That might explain the excess migration in my case. Dropped off at the dealership today. They claimed to have never heard of this issue and had not seen the TSB.

 

Offline Ohio HD

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Re: M8 trans fluid leaking in primary
« Reply #751 on: December 04, 2017, 06:25:35 PM »
Looks like it presses over the end of the mainshaft. Not much for it to grip to.   
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Online 1FSTRK

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Re: M8 trans fluid leaking in primary
« Reply #752 on: December 04, 2017, 06:48:28 PM »
They have come up with a small seal that goes on the clutch pushrod, there is a pic over on HDF. Looks like it's pressed on to the nut on the mainshaft bearing, owner says it was installed 11/30, too cold to test it out yet. :idunno:

If they can keep it in place it will sure slow down the tranfer. It will not fix the engineering flaw that traps the oil  above the main shaft but it is a cheap bandaid so HD will use it to get the public off their case and they will quietly make a proper change on a different model year. No defect, no recall.
 

Offline PoorUB

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Re: M8 trans fluid leaking in primary
« Reply #753 on: December 04, 2017, 07:22:21 PM »
Here it is,
I am an adult?? When did that happen, and how do I make it stop?!

Offline FSG

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Re: M8 trans fluid leaking in primary
« Reply #754 on: December 04, 2017, 08:04:20 PM »
 :scratch:   well at least they're doing something, but ......... 

they'd be better to use a better flangenut with a mating face seal fitted to the inner side cover, but then they would need to vent the slave cavity back to the trannie


Offline FSG

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Re: M8 trans fluid leaking in primary
« Reply #755 on: December 04, 2017, 08:10:24 PM »
Looks like it presses over the end of the mainshaft. Not much for it to grip to.

it'll probably press  into the mainshaft as well

Online 1FSTRK

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Re: M8 trans fluid leaking in primary
« Reply #756 on: December 04, 2017, 08:13:50 PM »
 There is the problem with any type of seal/baffle compared to removing the trapped oil, it could turn the slave cylinder into a diaphram pump, and  they can't totally seal the end of the shaft because it is still the only primary vent. 

Offline PoorUB

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Re: M8 trans fluid leaking in primary
« Reply #757 on: December 04, 2017, 09:16:28 PM »
I was trying to understand what they are trying to do here, seal the push rod? Seal the end of the shaft to the slave cylinder? Either way, how does the primary vent? Are they sealing the shaft to the slave and the rod, but allowing air to pass on the back side, (tranny side), of the seal? What happens if the area behind the slave eventually fills with oil?

I wonder what would happen if they drilled a 1/8" hole in the main shaft, under the output gear. They could seal the end of the mainshaft, and the mainshaft spinning would spin any oil out the hole, and the primary would still vent through the hole. :idunno:
I am an adult?? When did that happen, and how do I make it stop?!

Online 1FSTRK

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Re: M8 trans fluid leaking in primary
« Reply #758 on: December 05, 2017, 04:18:27 AM »
That would work in the future but costly as a retro on the bike that are out there.

The trouble is that they created this problem so undoing the design mistake would be a better fix, maybe they could call 1984 and find out what made this system work for over 30 years until they "fixed it"

Online Durwood

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Re: M8 trans fluid leaking in primary
« Reply #759 on: December 05, 2017, 04:21:42 AM »
« Last Edit: December 05, 2017, 04:28:09 AM by Durwood »

Offline rbabos

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Re: M8 trans fluid leaking in primary
« Reply #760 on: December 05, 2017, 10:48:19 AM »
They have come up with a small seal that goes on the clutch pushrod, there is a pic over on HDF. Looks like it's pressed on to the nut on the mainshaft bearing, owner says it was installed 11/30, too cold to test it out yet. :idunno:
If it in fact seals the pushrod,  the primary will not vent then. A separate vent is needed.
Ron

Offline Bigtwin

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Re: M8 trans fluid leaking in primary
« Reply #761 on: December 06, 2017, 12:29:45 PM »

I have this piece in my bike since earlier. Return trip of 80 Km: nothing to report. I'll tell you later if it's OK.

Offline Karl H.

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Re: M8 trans fluid leaking in primary
« Reply #762 on: December 06, 2017, 12:53:02 PM »
 :up:
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