Interesting read. They say venting the primary relieves excess pressure. Sorta makes you wonder why excess pressure in primary would force oil from the transmission back into the primary that has excess pressure when the only passage way is the inner shaft with the clutch pushrod. You would think if pressure was the problem, it would go the other way.

And if it was a design problem, why not all M8s.?

Also note, only if bike is still under warranty is this covered.

Know on my old 04, I have never had to add fluid to transmission. Just looking at that little spinner on the right side of the transmission has always amazed me that oils do not mix. And obiviously, the primary shares the transmission vent tube.

 

The harley M8 facebook page. I'm not on here that much. A lot of people have had good luck with the rod. Some have posted problems with the vent kit.
I have no personal interest either way, do what you want, was just giving another option/opinion.

 

Vent kit hit or miss? That is pure Bull$hit.

What does this have to do with anything, do you even have an M8?

Yeah, if you believe the bull$hit posted on a page that is a sales tool for the guy who makes the fat pushrods....

Something smells fishy here, sounds like you are shilling/trolling for the guy.

 

the way i understand it, it is not that excess pressure in the primary is forcing oil back into the primary, but that as the primary oil cools, and consequently contracts, it creates a vacuum that pulls the tranny fluid from the transmission into the primary. could be wrong, but that's what i remember reading.

 

I was just calling out what Harley said was the problem in their MC 10162967-9999.PDF that 6113 posted above.

What you are saying however is possible. How a reserve tank on a car radiator works to keep the radiator full with no air space.

However, for that to occur, the oil level in the transmission would have to be above the main input shaft. At the proper level on the dip stick, this would not occure. Especially if bike is on the stand.

 

The vent cured mine. It was under recall 18 FLHTCU

 

I had similar issue with my dealer on a new 19 Limited. My dealer was adamant Harley will not pay for the oil and the checks had to be done during regular maintenance to keep costs down for the customer. If you read the bulletin it states to "adjust the fluid levels" not change them. All the oil is still there, just in the wrong compartments. Even though I had it checked at a dealer in Colorado they claimed they had to verify it themselves.

In my case I had it checked and documented on the bill in Colorado when I stopped for an engine oil change. When I got home 1,500 miles later I had my dealer check it which verified the problem existed with another 8 oz transferred. They charged me for a trans/primary oil change and told me to come back when it was due again claiming they had to do the process from the beginning. By their interpretation of the bulletin it would have cost me $500 or more with oil changes and travel to have this warranty issue fixed on a brand new bike. And I would have had to stay close to home so they could do the work. I bought the bike for long range touring, not bar hopping. It would have been cheaper for me to pay them to install the kit, but they also claimed they could not order the kit till the issue was confirmed. I called Harley Canada's support phone number and after I told the support rep my issue he promptly gave me a case number and called the dealer for me. The dealer called me a few minutes later to tell me the kit was on order.

I honestly don't think my dealer was trying to screw me, they were following old procedures set by Harley before the June service bulletin was released. I do blame them for not keeping up on the latest service bulletins and procedures set by Harley. I am certain their claims there will be no damage to the primary or transmission are true, but when the oil doesn't appear on the transmission dipstick you can't tell if there is any oil in it at all. That would bother me severely on a long trip. Get yourself a new dealer or go back armed with the bulletin and a good understanding of its content. If the bike is still on warranty get Harley's support in the mix too.

 

or just do like I did, bought the kit for 40 bucks did it myself in an hour, problem solved. I don’t know why guys spend hours days weeks screwing with dealers over such a stupid simple fix. Heck now you can buy just the tube for 5 bucks.

 

Facebook hahaha it must be true then

 

New Harleys should come with same fluid in transmission and primary. If transmission is at correct level and someone getting a new Harley should check engine and transmission then and after ever service. If correct, one would need to loose a lot out of transmission to hurt anything and even a quart too much in primary will only make 1st shift engagement bang.

It hurts nothing in the short term. Probably take years to hurt and you would correct it when it started that harsh first gear engagement.