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post #1 of 12 (permalink) Old 06-11-2018, 06:54 AM Thread Starter
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M8 low transmission fluid

My daughter just bought a new Harley with the M8 engine. When she got it home my son-in-law who has a motorcycle repair shop checked the fluids and found no fluid touching the dip stick in the transmission. He called the dealer and was told that was normal so he called corporate headquarters. They told him to put fluid in the transmission and there was a problem with the fluid leaking into the primary and they were working on a solution. He told me to check my bike. Low and behold I had no fluid on the dipstick even with the bike off the jack stand. I will be at my local dealer today to discuss this with them. My advise to all of you M* owners, check your transmission fluid level.


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post #2 of 12 (permalink) Old 06-11-2018, 10:20 AM
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Unfortunately you got one of the M8's that exhibit the 'transmission to primary oil migration' design flaw.

There apparently is a fix that was developed by $tonecold; here is a link: https://www.hdforums.com/forum/milwa...fix-is-in.html

Very surprised and extremely disappointed that Harley is not taking care of their customers by not having a fix for this M8 design flaw. No wonder younger people don't buy a Harley.

.
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post #3 of 12 (permalink) Old 06-11-2018, 12:28 PM
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Quote:
Originally Posted by Wood View Post
Unfortunately you got one of the M8's that exhibit the 'transmission to primary oil migration' design flaw.

There apparently is a fix that was developed by $tonecold; here is a link: https://www.hdforums.com/forum/milwa...fix-is-in.html

Very surprised and extremely disappointed that Harley is not taking care of their customers by not having a fix for this M8 design flaw. No wonder younger people don't buy a Harley.

.

I see a lot of young people on Harleys. They are on Sportsters, Vrods, and Dynas. They may buy an M8 one day when the kids are out of college.
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post #4 of 12 (permalink) Old 06-11-2018, 12:33 PM
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Originally Posted by ameleo View Post
My daughter just bought a new Harley with the M8 engine. When she got it home my son-in-law who has a motorcycle repair shop checked the fluids and found no fluid touching the dip stick in the transmission. He called the dealer and was told that was normal so he called corporate headquarters. They told him to put fluid in the transmission and there was a problem with the fluid leaking into the primary and they were working on a solution. He told me to check my bike. Low and behold I had no fluid on the dipstick even with the bike off the jack stand. I will be at my local dealer today to discuss this with them. My advise to all of you M* owners, check your transmission fluid level.
If it was low on a brand new bike that means the dealer didn't prep the bike for delivery so I would be pissed. If she paid a prep fee, I would be doubly pissed.

Those of us who have been around engines a long time know to check the fluids and air pressure and fasteners and all other safety aspects of riding, sooner than later.

Whenever I let someone else change the fluids in a vehicle I go right behind them and pull the stick and make sure it is correct before I pay. Had a friend get an oil change the tech forgot to put oil back in the brand new turbo sports car on the first oil change.


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post #5 of 12 (permalink) Old 06-11-2018, 04:03 PM
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Quote:
Originally Posted by twowheeladdict View Post
If it was low on a brand new bike that means the dealer didn't prep the bike for delivery so I would be pissed. If she paid a prep fee, I would be doubly pissed.

Those of us who have been around engines a long time know to check the fluids and air pressure and fasteners and all other safety aspects of riding, sooner than later.

Whenever I let someone else change the fluids in a vehicle I go right behind them and pull the stick and make sure it is correct before I pay. Had a friend get an oil change the tech forgot to put oil back in the brand new turbo sports car on the first oil change.

It was a new bike and is not caused by poor dealer prep.

M8's that have 'transmission oil migrating into the primary' is a known problem and is a design flaw.
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post #6 of 12 (permalink) Old 06-11-2018, 05:38 PM
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Originally Posted by Wood View Post
It was a new bike and is not caused by poor dealer prep.

M8's that have 'transmission oil migrating into the primary' is a known problem and is a design flaw.
You are correct that SOME M8's have shown to have this problem. However, none of them have had the oil migration show up right out of the box. The bike would have had to have been ridden for several miles and, from what has been seen prior, would have to be at sustained higher RPM's. A brand new bike straight from the dealer should have fluid and would not have the migration issue show up just yet. If the bike had been prepped properly the tech would have checked all the fluids and topped them off if necessary.
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post #7 of 12 (permalink) Old 06-11-2018, 08:31 PM
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It was a new bike and is not caused by poor dealer prep.

M8's that have 'transmission oil migrating into the primary' is a known problem and is a design flaw.
Didn't say it was caused by poor dealer prep. The poor dealer prep was the fact that they didn't see that he fluid was low.
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post #8 of 12 (permalink) Old 09-02-2018, 11:50 AM
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Quote:
Originally Posted by twowheeladdict View Post
If it was low on a brand new bike that means the dealer didn't prep the bike for delivery so I would be pissed.

Those of us who have been around engines a long time know to check the fluids and air pressure and fasteners and all other safety aspects of riding, sooner than later.
Quote:
Originally Posted by RGKen View Post
You are correct that SOME M8's have shown to have this problem. However, none of them have had the oil migration show up right out of the box. The bike would have had to have been ridden for several miles and, from what has been seen prior, would have to be at sustained higher RPM's. A brand new bike straight from the dealer should have fluid and would not have the migration issue show up just yet. If the bike had been prepped properly the tech would have checked all the fluids and topped them off if necessary.
It could be that the dealer didn't check the transmission for fluid level, it could be that they were told to leave it low in an effort to keep it from transferring, or it could be that it transferred that much in a short period of time.

I have never before now known Harley transmissions to have a level problem unless there was an evident leak. I would have not checked my M8 except for the problem being mentioned on another forum. When I discovered that the problem had manifested itself in my M8, I started looking for a solution. To date, there are two things that seem to stem the flow of oil from the transmission to the primary. Using the three piece hydraulic pushrod from the '14 models seems to work 80-90% of the time from reports from German riders and a couple riders here in the states that I communicate with. Then there is "The Fix". This is what I developed. It places a seal between the transmission and the primary. It appears to be 100% effective when it is machined and installed correctly. There are numerous riders that have several thousand miles on "The Fix" without any migration.

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post #9 of 12 (permalink) Old 09-02-2018, 12:07 PM
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Here are a few pictures of "The Fix".







Attached Images
File Type: jpg Actuator with vent hole drilled.jpg (690.4 KB, 129 views)
File Type: jpg Installed after testing.jpg (293.3 KB, 121 views)
File Type: jpg Nut installed on transmission.jpg (644.5 KB, 126 views)
File Type: jpg Side cover seal installed.jpg (667.1 KB, 125 views)

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post #10 of 12 (permalink) Old 09-02-2018, 12:50 PM
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Originally Posted by $tonecold View Post
Here are a few pictures of "The Fix".







It's great that you figured that out. The only problem is there are those of us who don't have the mechanical skill to do that ourselves or just expect the company to fix a problem on a bike that this still under warranty. I'm 800 miles into my required 1000 mile ride before I return for them for a recheck. I had 7 ozs migrate in 4000 miles.

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