Author Topic: M8 trans fluid leaking in primary  (Read 115017 times)

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Online VDeuce

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Re: M8 trans fluid leaking in primary
« Reply #1575 on: July 11, 2019, 02:16:09 PM »
Just installed the primary vent today; pretty easy job. Noticed a slight amount of transfer with the CVO 3-piece pushrod, though very little. This should solve it completely I think.

Offline hd06

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Re: M8 trans fluid leaking in primary
« Reply #1576 on: July 11, 2019, 03:43:47 PM »
 The vent is all you need.

Offline Jaycee1964

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Re: M8 trans fluid leaking in primary
« Reply #1577 on: July 17, 2019, 03:55:17 AM »
Ok,  Had Primary vent and trans seal installed 6/27 at dealer.  Its now 7/17 and about 1500 miles later and the dip stick level is exactly where it was when the trans was filed.  Fix worked for me.
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Offline SixShooter14

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Re: M8 trans fluid leaking in primary
« Reply #1578 on: July 17, 2019, 06:13:23 AM »
Ok,  Had Primary vent and trans seal installed 6/27 at dealer.  Its now 7/17 and about 1500 miles later and the dip stick level is exactly where it was when the trans was filed.  Fix worked for me.
:up:
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Online crewchief25H

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Re: M8 trans fluid leaking in primary
« Reply #1579 on: July 17, 2019, 05:45:49 PM »
Just installed the primary vent today; pretty easy job. Noticed a slight amount of transfer with the CVO 3-piece pushrod, though very little. This should solve it completely I think.

VD
Did you leave the CVO rod installed, or go back to oem?

Online VDeuce

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Re: M8 trans fluid leaking in primary
« Reply #1580 on: July 18, 2019, 07:55:00 AM »
Just installed the primary vent today; pretty easy job. Noticed a slight amount of transfer with the CVO 3-piece pushrod, though very little. This should solve it completely I think.

VD
Did you leave the CVO rod installed, or go back to oem?
Left the CVO rod in place.

Offline Xyzzy

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Re: M8 trans fluid leaking in primary
« Reply #1581 on: July 19, 2019, 05:11:16 AM »
I bought a 2019 RK about a week ago. I have previously owned three other M8 touring bikes that did not have the transfer issue. My new RK has a build date of 4/19 and did not have the vent installed from the factory.

I rode the bike home (210 miles) and checked the transmission. It was 12 ounces low. I refilled the transmission and ordered the vent kit from Surdyke. I'm sure the dealer would do it under warranty, but I prefer to do my own work. Plus all of the dealers "near" me are booked up solid. And, every time I have a dealer work on something they do a crappy job.

I continued to ride the bike. Every day I refilled the transmission. I was curious how the additional oil would affect the primary so I just let it build up in there. Surprisingly, the shifting was still pretty good, and finding neutral was easy. As a test, I rolled to a stop in sixth gear and I was able to downshift to first without loading the transmission, so that indicated to me that the additional oil in the primary was spinning the clutch.

Log:
12 ounces @ 210 miles
12 ounces @ 421 miles
12 ounces @ 700 miles
20 ounces @ 991 miles
14 ounces @ 1434 miles

At this point I received the vent kit. I drained the primary. I didn't measure the oil that came out, but it was a lot! The vent install went smooth. The only catch to the install is to make sure the vent is seated in the hole fully. I've attached a picture of the hole that is drilled in the inner primary.

So I took the bike 370 miles yesterday after the install and when I checked the transmission this morning the oil was right where it is supposed to be.

Theory: My previous bikes did not transfer oil. Perhaps they had a very minor (pinhole?) "leak" somewhere in the primary system that vented the primary?

It is crazy to have a few bikes that do not transfer any oil in 20,000+ miles each and then get a bike that transfers oil at the rate of 12 ounces every 200 miles!

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Online Norton Commando

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Re: M8 trans fluid leaking in primary
« Reply #1582 on: July 19, 2019, 05:34:26 AM »
Thanks for the feedback. It sure sounds like venting the primary is the cure to stop transmission fluid from migrating into the primary.

I assume you drilled the vent hole from the primary side? Did you need an extra long drill bit?

Jason
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Offline Xyzzy

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Re: M8 trans fluid leaking in primary
« Reply #1583 on: July 19, 2019, 05:52:39 AM »
Yes, from the primary side.

I used a bunch of small bits working my way up to an 11/32" bit.

They were normal-length bits.

I should have just bought the vent tube. I didn't need the template or the gaskets. (Inspection cover, primary and drain bolt gaskets.)

Offline IronButt70

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Re: M8 trans fluid leaking in primary
« Reply #1584 on: July 19, 2019, 08:06:49 AM »
Yes, from the primary side.

I used a bunch of small bits working my way up to an 11/32" bit.

They were normal-length bits.

I should have just bought the vent tube. I didn't need the template or the gaskets. (Inspection cover, primary and drain bolt gaskets.)
No threading of the vent hole needed?
Rollin down lifes hiway never looking back cuz something might be gaining on me

Offline Xyzzy

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Re: M8 trans fluid leaking in primary
« Reply #1585 on: July 19, 2019, 10:14:07 AM »
It is just a smooth weirdly-shaped plastic/rubber tube. You just snake it in and make sure it is seated properly.

Offline Hossamania

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Re: M8 trans fluid leaking in primary
« Reply #1586 on: July 19, 2019, 10:27:18 AM »
So a guy could probably make his own pretty cheaply?
No shirt, no shoes, and I still get service. Why?
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Online HOGMIKE

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Re: M8 trans fluid leaking in primary
« Reply #1587 on: July 19, 2019, 11:46:02 AM »
So a guy could probably make his own pretty cheaply?


Unlikely, but you COULD achieve the same results with a couple of fittings, length of hose, drill and tap!
I had all the parts ready to do my own, but got the factory tech to do it under warranty including primary gasket, o-ring, quart of oil. Cheaper than I could do it.
 :nix:
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Offline IronButt70

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Re: M8 trans fluid leaking in primary
« Reply #1588 on: July 19, 2019, 12:11:29 PM »
It is just a smooth weirdly-shaped plastic/rubber tube. You just snake it in and make sure it is seated properly.
Saw the beveled lip in the pic. I would just be a little concerned about fluid maybe seeping out from around the plastic over time.
Rollin down lifes hiway never looking back cuz something might be gaining on me

Online VDeuce

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Re: M8 trans fluid leaking in primary
« Reply #1589 on: July 19, 2019, 01:12:36 PM »
Kit is only around $30, so not too cost prohibitive and a whole lot cleaner install than with fittings.

Online HOGMIKE

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Re: M8 trans fluid leaking in primary
« Reply #1590 on: July 19, 2019, 01:18:28 PM »
It is just a smooth weirdly-shaped plastic/rubber tube. You just snake it in and make sure it is seated properly.
Saw the beveled lip in the pic. I would just be a little concerned about fluid maybe seeping out from around the plastic over time.


Not very likely as the hose and primary case is under a slight negative pressure.
The hose is pretty soft

 :missed:
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Offline Xyzzy

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Re: M8 trans fluid leaking in primary
« Reply #1591 on: July 20, 2019, 04:50:17 AM »
So I took the bike 370 miles yesterday after the install and when I checked the transmission this morning the oil was right where it is supposed to be.

I rode 400 miles yesterday. I checked the oil again this morning. It hasn't moved!

At this point I consider it a done deal.

:wink:

Offline BUGLET

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Re: M8 trans fluid leaking in primary
« Reply #1592 on: July 23, 2019, 03:07:44 PM »
    Just had a new 19 from dealer come in, it has the vent in the primary all ready in it.

Offline IronButt70

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Re: M8 trans fluid leaking in primary
« Reply #1593 on: July 23, 2019, 06:24:27 PM »
    Just had a new 19 from dealer come in, it has the vent in the primary all ready in it.
Dealer or factory installed?
Rollin down lifes hiway never looking back cuz something might be gaining on me

Offline BUGLET

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Re: M8 trans fluid leaking in primary
« Reply #1594 on: July 24, 2019, 05:08:20 AM »
   Knowing the dealer I would said that is the way it came from the factory. But without being there I can say 100%.

Offline Xyzzy

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Re: M8 trans fluid leaking in primary
« Reply #1595 on: July 24, 2019, 05:32:25 AM »
So I took the bike 370 miles yesterday after the install and when I checked the transmission this morning the oil was right where it is supposed to be.

I rode 400 miles yesterday. I checked the oil again this morning. It hasn't moved!

At this point I consider it a done deal.

:wink:

I rode 625 miles on the interstate yesterday and the oil is still right where it is supposed to be!

:koolaid:

Online HOGMIKE

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Re: M8 trans fluid leaking in primary
« Reply #1596 on: July 24, 2019, 06:10:18 AM »
   Knowing the dealer I would said that is the way it came from the factory. But without being there I can say 100%.

Checked a cvo limited yesterday
Build date of 4/19
No vent hose.
They donít have anything newer on the floor.
 :nix:
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Offline BUGLET

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Re: M8 trans fluid leaking in primary
« Reply #1597 on: July 24, 2019, 09:44:14 AM »
       Build date on this one is 5/19.

Offline SixShooter14

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Re: M8 trans fluid leaking in primary
« Reply #1598 on: July 24, 2019, 09:47:56 AM »
I would be interested in hearing from Tomcat about whether he's received any with the hose pre-installed.
'97 Road King, Rinehart True Dual, Mikuni carb

Offline pendo31

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Re: M8 trans fluid leaking in primary
« Reply #1599 on: July 25, 2019, 04:05:33 AM »
My local dealer said that the new bikes coming in have the vent installed from the factory showing me one that they just received with it.
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