Cruisers Forum
 


Join CruisersForum Today

Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 08-11-2016, 22:43   #1
Registered User

Join Date: Sep 2009
Location: Home is in the Sth West of the UK
Boat: Wright 40 - 1977 build, ketch, 12 mts
Posts: 73
Heller fans slowing to a stop!

Hi, hope I'm in the right place!
I have some heller 12v fans on board and a few have suddenly stopped working. The thing is that if I apply a little bit of pressure at the back of the blades, they will go again, too much pressure and they stop.

I am wondering if anyone else has had this problem and if anyone knows what I can do to fix them please. Throwing away and buying new are not an option for me. I need a fix.

Thanks for your help
Gillie,
S y Tuppenny, Malaysia
__________________

S Y Tuppenny is offline   Reply With Quote
Old 08-11-2016, 23:29   #2
Registered User
 
Alan Mighty's Avatar

Join Date: Mar 2014
Location: Scarborough Boat Harbour, Moreton Bay
Boat: US$4,550 of lead under a GRP hull with cutter rig
Posts: 1,418
Re: Heller fans slowing to a stop!

Contact Us - Hella Marine
__________________

__________________
“Fools say that you can only gain experience at your own expense, but I have always contrived to gain my experience at the expense of others.” - Otto von Bismarck
Alan Mighty is offline   Reply With Quote
Old 09-11-2016, 00:03   #3
Registered User

Join Date: Jan 2012
Location: vessel sold at LAKES ENTRANCE to a local. Currently nursing my 93 Y/o mother in Sydney. Next boat probably will be bought in the U.S.
Boat: triton 721 24' x 9' 1985 Cutter rigged.
Posts: 922
Re: Heller fans slowing to a stop!

From a distance, this tradesman suspects voltage drop. If it were only one fan the it could be anything.
My suspicion is that the fan furthest from the supply failed first.
Use a multimeter to check voltage and the check for resistance in the earth return.
Irrespective of the distance the earth wire from the unit back to earth must have absolute continuity, virtully no resistance.
But i susp voltage drop in the joints (which I always solder)....or very little voltage even at switch on your switchboard.
If you dont have a multimeter, they're cheap, come with instructions and solve many many problems.
brianlara 3 is offline   Reply With Quote
Old 09-11-2016, 00:07   #4
Registered User

Join Date: Jan 2012
Location: vessel sold at LAKES ENTRANCE to a local. Currently nursing my 93 Y/o mother in Sydney. Next boat probably will be bought in the U.S.
Boat: triton 721 24' x 9' 1985 Cutter rigged.
Posts: 922
Re: Heller fans slowing to a stop!

Forgot.... very ofter older wire, especiall untinned wire, just corrodes away to a spaghetti of copper oxide which just ain't wire anymore...just brown powder in a pvc tube.
brianlara 3 is offline   Reply With Quote
Old 09-11-2016, 08:37   #5
Registered User
 
KadeyKrogen38's Avatar

Join Date: Dec 2014
Location: Clear Lake, TX
Boat: Kadey Krogen 38
Posts: 138
Images: 1
Re: Heller fans slowing to a stop!

Heller fans wear out after about 2000 hours and are trash at that point
KadeyKrogen38 is offline   Reply With Quote
Old 09-11-2016, 08:39   #6
Registered User

Join Date: Jan 2013
Location: Ormond Beach, Florida
Boat: 1988 Wilbur 34
Posts: 208
Re: Heller fans slowing to a stop!

I've experienced similar problems with several fans. Though not Heller, my guess is a good cleaning and a bit of light lube oil applied to the shaft may get them working. In my case, I removed the protective covers and cleaned the blades and motor housing with a soft brush to remove the accumulated dust. Then applied a drop of light lube oil to the shaft at the motor housing. And they worked like new.

Hope this helps.
Seighlor is offline   Reply With Quote
Old 09-11-2016, 12:15   #7
Registered User

Join Date: Jun 2011
Location: suva fiji
Boat: 28 bristol channel cutter
Posts: 12
Re: Heller fans slowing to a stop!

have had these for years...when they get old the internal components in the motor wear out...sorry mate there is no fix it's new fan time!
doug cusick is offline   Reply With Quote
Old 09-11-2016, 12:19   #8
Registered User

Join Date: Dec 2011
Location: Massachusetts
Boat: Formosa 41
Posts: 791
Re: Heller fans slowing to a stop!

So, I can safely assume we are not going to be talking about DC v. Heller?
Jason Flare is offline   Reply With Quote
Old 09-11-2016, 12:31   #9
Registered User
 
UNCIVILIZED's Avatar

Join Date: Jun 2014
Location: Up the mast, looking for clean wind.
Boat: Currently Shopping, & Heavily in LUST!
Posts: 5,629
Re: Heller fans slowing to a stop!

Quote:
Originally Posted by Seighlor View Post
I've experienced similar problems with several fans. Though not Heller, my guess is a good cleaning and a bit of light lube oil applied to the shaft may get them working. In my case, I removed the protective covers and cleaned the blades and motor housing with a soft brush to remove the accumulated dust. Then applied a drop of light lube oil to the shaft at the motor housing. And they worked like new.

Hope this helps.
This is worth trying. Though inspect around their hubs with the blades off, prior to starting anything along these lines. And BTW, have you tried seeing if they'll spin without the blades on the hubs? Never hurts to inspect them nekked too.

Often, over time, bits of dust get compacted around the motors' axle where it exits, & it binds things up a bit. Along with causing wear in said location. Even to the point of penetrating sealed bearings & motors, or if not penetrating them, then gumming them up.

So after cleaning this area, I'd try some ("dry") graphite lube first. With machine oil being the #2 choice. Since dry lubes won't attract more dust & garbage to the area like an oil might. Just use caution when cleaning, as things like dental picks, which have sharp tips, can at times damage things with tight tolerances, & especially, seals.

On many things, I've used brake cleaner with the straw attached to the can to blast gunk out of things. But it too is a risk, as it has some strong solvents, which (rarely) can attack plastics, rubber, or some seals materials. It's generally handy stuff though. And it degreases too.
__________________

The Uncommon Thing, The Hard Thing, The Important Thing (in Life): Making Promises to Yourself, And Keeping Them.
UNCIVILIZED is offline   Reply With Quote
Old 09-11-2016, 12:38   #10
Senior Cruiser
 
Dave_S's Avatar

Cruisers Forum Supporter

Join Date: Jun 2016
Location: Brisbane Australia
Boat: Schionning Waterline 1480
Posts: 1,221
Re: Heller fans slowing to a stop!

One possibility is that the thrust washer or surface has worn out. Not sure if you can get to it to fix it or not. If not some light lubricant on the face might help short term. But if the armature can move further back because of wear and is now in contact with another part or is no longer in good contact with the poles or brushes somehow you need to move the armature back by packing out the thrust face.
__________________
Regards
Dave
Dave_S is online now   Reply With Quote
Old 10-11-2016, 06:49   #11
Registered User
 
rwidman's Avatar

Join Date: Feb 2008
Location: North Charleston, SC
Boat: Camano Troll
Posts: 4,669
Re: Heller fans slowing to a stop!

Quote:
Originally Posted by Seighlor View Post
I've experienced similar problems with several fans. Though not Heller, my guess is a good cleaning and a bit of light lube oil applied to the shaft may get them working. In my case, I removed the protective covers and cleaned the blades and motor housing with a soft brush to remove the accumulated dust. Then applied a drop of light lube oil to the shaft at the motor housing. And they worked like new.

Hope this helps.
This is worth a try. There should be a bearing at each end of the motor so try to oil both. Cleaning before oiling is the best plan. And you want light oil, not motor oil.
__________________
Ron
HIGH COTTON
Sent from my laptop using Windows 7
rwidman is offline   Reply With Quote
Old 12-11-2016, 05:17   #12
Registered User

Join Date: Sep 2009
Location: On the water. Homeport: Boston
Boat: Sabre 28, GalleyHo
Posts: 12
Re: Heller fans slowing to a stop!

Is your fan the single speed Hella with a dome-shaped switch on the front?

Bill
GalleyHo is offline   Reply With Quote
Old 12-11-2016, 17:55   #13
Registered User

Join Date: Sep 2009
Location: Home is in the Sth West of the UK
Boat: Wright 40 - 1977 build, ketch, 12 mts
Posts: 73
Re: Heller fans slowing to a stop!

not sure what you mean tbh! but thanks anyway
S Y Tuppenny is offline   Reply With Quote
Old 12-11-2016, 19:39   #14
Moderator
 
JPA Cate's Avatar

Join Date: Nov 2011
Location: aboard, cruising in Australia
Boat: Sayer 46' Solent rig sloop
Posts: 16,540
Re: Heller fans slowing to a stop!

S Y Tupenny,

Tbh, I don't have a clue what you mean, either! It might help if you mentioned the person's screen name or even the post number.

The general idea is as follows:

Demount one of the fans. Remove the blades from the output shaft. Visually check to see that the area by the bearing (inner visible end of shaft) doesn't have dust, hair, or anything else spun onto it. Clear it, (a dental pick is great for this, if you have an appropriate one)* and clean it with meths. Place one or two drops light machine oil on the base of the shaft by the bearing, and hand spin the shaft to spread the oil. Me, I'd use sewing machine oil, 'cause that's what I have. Clean all the exterior bits, and give it a go.

* We are tool using animals, possibly you can make a probe from a paper clip, or a round toothpick.

It is always possible that they have worn out, and it's a real pain to re-brush the motors, although for a while, years ago, slot car drive motors were being used for the purpose in the cruising fleet. If worn out, you can replace with Caframo, which are not nearly as difficult to keep clean.

Try with each of the fans, because generally some of them get more use than others, and will be farther along their self-destruct path.

Now, since you're de-mounting them, go back and re-read brianlara3's posts about dealing with the possibility of the wiring starting to fail. Wire failure is common on boats.. Check the wire, before you go to tighten it, make sure it's pretty much intact.

You can do this.

Ann
__________________
Who scorns the calm has forgotten the storm.
JPA Cate is offline   Reply With Quote
Old 12-11-2016, 19:51   #15
Senior Cruiser
 
senormechanico's Avatar

Cruisers Forum Supporter

Join Date: Aug 2003
Boat: Dragonfly 1000 trimaran
Posts: 6,679
Re: Heller fans slowing to a stop!

I REALLY like these. Quiet, move lots of air and have liquid bearings:

Arctic Cooling F12 120mm 1350 RPM Fan AFACO-12000-GBA01 | eBay

Hall effect sensor instead of brushes, so nothing to wear out.
__________________

__________________
One should try to "Die Young" as old as possible.
senormechanico is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Electric winches slowing down - problem lurking? jr_spyder Deck hardware: Rigging, Sails & Hoisting 5 22-06-2014 16:22
Isotherm Freezer - Run, Stop, Run, Stop... Cruisin Cat Electrical: Batteries, Generators & Solar 8 24-04-2014 18:06
Hella Fans Caframo Fans Brushless Fans cat man do Construction, Maintenance & Refit 37 05-09-2012 00:45
What islands to stop at and what islands not to stop at that is the question?Carib- Ram Atlantic & the Caribbean 11 21-05-2012 17:57
Ships Slowing Down roverhi Seamanship & Boat Handling 13 30-01-2011 10:25



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 22:55.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.