Fan assist oil cooler
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Grand HDF Member
Joined: Nov 2013
Posts: 3,807
Likes: 1,488
From: SW Washington State
Fan assist oil cooler
We have had some discussions around the operation of the fan. Unless I missed something, we never knew when the fan was to activate, until now. I have been pulling teeth as someone posted about getting information out of the MoCo.
The tech said the fan is activated by the "head Temp sensor" [ rear head ] at 220 degrees and road speed below 20mph.
I could be wrong, but I imagine anytime the engine has been run to temp the rear head will have reached above 220.
Now it seems my Dealer and bike are both out of order, those that have working fans my hat is off to you Lucky dogs.
Oh boy, I get to visit the dealership.
The tech said the fan is activated by the "head Temp sensor" [ rear head ] at 220 degrees and road speed below 20mph.
I could be wrong, but I imagine anytime the engine has been run to temp the rear head will have reached above 220.
Now it seems my Dealer and bike are both out of order, those that have working fans my hat is off to you Lucky dogs.
Oh boy, I get to visit the dealership.
Road Master
Joined: Aug 2011
Posts: 1,195
Likes: 299
From: midwest
Your right, 220 isn't very high. My guess is that the oil cooled models need to activate early to prevent oil temp buildup, due to the fact the oil is circulating around the exhaust valves. While the head may not be that hot, the oil returning to the pan may need 'early intervention'.
Jason Ward, who developed the cooling fans on the twinkies, found early on that preventing heat is MUCH easier than cooling it once overheated.
Just my thought...
Jason Ward, who developed the cooling fans on the twinkies, found early on that preventing heat is MUCH easier than cooling it once overheated.
Just my thought...
Seasoned HDF Member
Joined: Jan 2008
Posts: 13,623
Likes: 11,354
From: State of Confusion
no or they would have made them OEM on the air/oil cooled Touring bikes.
like HD said, and Steve Cole tested and recommended:
Parade Duty stop and go
Warm climates with a lot of street traffic and speeds
I did it for peace of mind because every year we inevitably get caught in Summer heat road construction, etc. on our many trips and I prefer to use conventional oil
like HD said, and Steve Cole tested and recommended:
Parade Duty stop and go
Warm climates with a lot of street traffic and speeds
I did it for peace of mind because every year we inevitably get caught in Summer heat road construction, etc. on our many trips and I prefer to use conventional oil
Last edited by mjwebb; Feb 3, 2017 at 01:56 PM.
Seasoned HDF Member
Joined: Oct 2014
Posts: 5,022
Likes: 2,352
From: Camp Lejeune, NC
Yes, it's enabled in the ECM. As far as I know you can't tweak the temp settings. I think it's thermostatically controlled by the engine temp sensor.
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Seasoned HDF Member
Joined: Oct 2014
Posts: 5,022
Likes: 2,352
From: Camp Lejeune, NC
no or they would have made them OEM on the air/oil cooled Touring bikes.
like HD said, and Steve Cole tested and recommended:
Parade Duty stop and go
Warm climates with a lot of street traffic and speeds
I did it for peace of mind because every year we invariably get caught in Summer heat road construction, etc. on our many trips and I prefer to use conventional oil
like HD said, and Steve Cole tested and recommended:
Parade Duty stop and go
Warm climates with a lot of street traffic and speeds
I did it for peace of mind because every year we invariably get caught in Summer heat road construction, etc. on our many trips and I prefer to use conventional oil
That's exactly why I got one too.
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Seasoned HDF Member
Joined: Jan 2008
Posts: 13,623
Likes: 11,354
From: State of Confusion
Just installed the fan assist cooler this past weekend. Tried a short cut that revealed a potential weak link in the oil cooler circuit.
I pulled the factory cooler and tried to keep the factory oil lines intact and just swap out the cooler itself. Install was straight forward, added new oil to make up for what was in the cooler and started the bike.
Inspected for leaks and it was dripping from the hose that connects the cooler lower hose to just in front of the cam chest.
Now the cooler kit comes with worm drive clamps to replace the factory band clamps and those one-time crimp clamps, but I decided to chance it.
After pulling the header last night to gain access to the lower oil hose and band clamp I discovered that the factory band clamp was not very tight at all and the rubber oil line was rotating freely with the band clamp installed.
Question: Does the fan assist cooler have increased capacity i.e. cooling rows etc? Increased pressure due to this?
This hose never leaked until I installed the new cooler.
I pulled the factory cooler and tried to keep the factory oil lines intact and just swap out the cooler itself. Install was straight forward, added new oil to make up for what was in the cooler and started the bike.
Inspected for leaks and it was dripping from the hose that connects the cooler lower hose to just in front of the cam chest.
Now the cooler kit comes with worm drive clamps to replace the factory band clamps and those one-time crimp clamps, but I decided to chance it.
After pulling the header last night to gain access to the lower oil hose and band clamp I discovered that the factory band clamp was not very tight at all and the rubber oil line was rotating freely with the band clamp installed.
Question: Does the fan assist cooler have increased capacity i.e. cooling rows etc? Increased pressure due to this?
This hose never leaked until I installed the new cooler.
Advanced
Joined: Jan 2017
Posts: 90
Likes: 14
From: Mass
from what I can tell the cooler itself is the same as the OEM..funny thing is when I saw the fan assisted oil cooler I was hesitant to install it because I didn't want to potentially introduce a leak, don't fix what's not broken so to speak, then my OEM hose started leaking at the hose in front of the cam chest with the OEM crimp clamp so that that concern was no longer valid and I had the fan assist installed with the worm drive clamp and 2000 miles later hasn't leaked a drop
Think I am going to replace the rest of the band style clamps for the oil circuit with worm drive clamps..I saw two more on the rear head and at the transmission.
Edit: when you say crimp clamp by the cam chest, do you mean Oeticker crimp clamp or band clamp?
Mine was a cheap band style clamp there and Oeticker style at the cooler
Last edited by Johnny!; Feb 15, 2017 at 07:36 AM.