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Author Topic: HD's fix for the oil transfer as of now.  (Read 15853 times)

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grc

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Re: HD's fix for the oil transfer as of now.
« Reply #75 on: September 13, 2019, 11:32:48 AM »

I have a 2019 CVO Limited purchased last Nov. I have 6500 miles on my bike. I check my transmission fluid every 500 miles and it is full, no vent installed. Why are some bikes having fluid transfer issues and mine isn't?

Short answer, a lack of consistency in Harley's products.  It's the same reason some have sumping problems and others do not. 

Jerry
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Jerry - 2005 Cherry SEEG  -  Member # 1155

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Robmay

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Re: HD's fix for the oil transfer as of now.
« Reply #76 on: September 17, 2019, 09:39:37 PM »

Is the fluid transfer and sumping not the same thing?

Rob


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Twolanerider

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Re: HD's fix for the oil transfer as of now.
« Reply #77 on: September 17, 2019, 10:05:31 PM »

Is the fluid transfer and sumping not the same thing?

Rob


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Oh Lordie no Rob.  Harley would never be satisfied with just a single unresolved engineering issue.  Transfer is fluid migration between trans and primary.  Sumping is an internal engine issue.  Thank gawd our design isn't like a modern Indian where all share a common fluid and drain.  Harley would have had to engineer the hell out of that system to create both problems at the same time!
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Robmay

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Re: HD's fix for the oil transfer as of now.
« Reply #78 on: September 17, 2019, 10:13:44 PM »

Thanks Don. So where does the engine oil go when it sumps?

Rob


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Twolanerider

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Re: HD's fix for the oil transfer as of now.
« Reply #79 on: September 17, 2019, 10:49:16 PM »

Thanks Don. So where does the engine oil go when it sumps?

Rob


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Harley engines are intended to be a "dry sump" system.  That's an engine where the crankshaft isn't rotating through a pool of oil in the bottom of an oil pan as most car engines do.  The oil is circulated continuously and continuously lubricating the rotating and other moving assemblies but the oil capacity not actively doing that at any given time remains in the remote oil pan (where we drain the oil from).

The benefit to this is that there no parasitic power loss from the crankshaft having to swim through the liquid wall of oil with every rotation.  The "sumping" problem so many are dealing with (and we're always hoping doesn't happen) is when something occurs and an amount of oil does in fact pool in the bottom of the engine that is large enough in quantity/mass that it becomes that parasitic drag on the engine that it was never designed for.  Power goes down, heat goes up, when bad enough parts fail and engines die.
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Robmay

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Re: HD's fix for the oil transfer as of now.
« Reply #80 on: September 18, 2019, 01:09:41 PM »

Thank you again Don. Very good description (for me! ).

Rob


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