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08-24-2020, 10:24 AM
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#1
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Junior Member
Join Date: Oct 2015
Posts: 21
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Fan clutch service bulletin question
Thank you in advance.
After many hours of research through the forums and many post about a service bulletin for the fan clutch issue with a Cummins isb engine.
My rig is 2008 Discovery 39r 350hp cummins motor.
There is a known issue with the electronic fan clutch and many mentions of a service bulletin. Does anyone happen to know the actual service bulletin # (and yes # is not a hashtag) in regards to the fan clutch issue or Freightliner Service Solution 3737?
Supposedly, Freightliner might cover the part for this repair. I do have an extended warranty on my rig as well.
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08-24-2020, 08:14 PM
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#2
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Senior Member
Monaco Owners Club
Join Date: Mar 2004
Location: Mobile, AL
Posts: 363
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Freightliner TSB
Hi -
To the best of my understanding, there is no TSB (Technical Service Bulletin) for the issue. I have been to multiple Freightliner shops (including the "mother ship" at Gaffney, SC and the location at Tolleson, AZ).
To a man, every shop told me that there is no TSB for the fan clutch, and that my overheating situation was a "one-off" the likes of which they had never seen nor heard of. The same from Winnebago service in Junction City, OR. I spoke with the mechanics at each site and all denied any knowledge of this being an issue - despite my presentation of reams of information from folks from here (IRV2) and photos of my rig just as it ran through the process from just starting to getting warmer to getting hot to me stopping the Rig and pulling over at 215 degree (alarm sounding but no de-rating).
So I offer all of that in support of the lack of a TSB. That said, the PO of our rig had the fan clutch replaced twice under warranty from Freightliner - and they did so only because it actively overheat while they were driving it and they saw it for themselves (I have the written documentation from all repairs that the PO ever had done!). According to Freightliner, there is no systemic problem. The PO was lucky in that initially Freightliner could not replicate the problem and were going to send him on his way, and when they were returning the rig to the owner waiting at the shop it overheated...the PO was lucky.
I also think that what some are referring to as a TSB is the Service Solution #3737. The SS #3737 is a diagnostic routine that typically ends with the conclusion to replace the fan clutch; the same one for which there is "no known problem".
Please keep us posted how this works out; I know that there are many individuals who are interested.
John
__________________
John S
2008 Monaco Dynasty Diamond IV
Cummins ISL 425 8.9L
Towing 2015 Ford CMax Energi
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08-25-2020, 08:41 AM
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#3
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Senior Member
Fleetwood Owners Club Freightliner Owners Club
Join Date: Feb 2012
Location: Central Arkansas
Posts: 1,362
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Correct John. There is no Service Bulletin...there is only the Service Solution. There was a member that actually found and posted the SS...but I didn't save it as it really wasn't much to look at.
It is a well documented problem....and if you call Gaffney you may find that they have replaced many many Horton fan clutch units. There is no warranty and Freightliner will not pay for the part...at least on your '08 unit kinein.
The parts guys at Gaffney did mention that they install the Horton Guard Dog as a first step...which costs about $150...but in the end they replace the clutch.
The same member that posted the SS also had FL install the Guard Dog (and at a very high price I would say) for no joy.
There was another member just recently that posted he found his diode in the anti-rotational bracket was bad...and that fixed his issue with the clutch (there is a diode across the contacts inside the connector at the clutch).
The Guard Dog and the anti-rotation bracket (harness) are easily replaced DIY. I think that in the case of members who have replaced these parts where experiencing a total loss of air flow and lock up of the clutch by pulling the fuse. In other words...the clutch wasn't working at all and the diode was the fix. I had considered installing the Guard Dog...but haven't. I replaced my clutch 3 years and 30,000 miles ago....still fully function.
If you have read the many posts regarding this issue...I'm surprised at your conclusion that FL might pay? In any case...depending on your symptom...like not enough air flow....the clutch has failed.
__________________
2008 Fleetwood Bounder 38S 2022 Grand Cherokee WK Limited 2021 Polaris Slingshot R Limited
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08-25-2020, 09:58 AM
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#4
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Senior Member
Winnebago Owners Club Nor'easters Club
Join Date: Oct 2012
Location: South Jersey
Posts: 901
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You can find a copy of the SS here https://www.irv2.com/forums/f123/cum...230056-13.html
I suggest you check out the whole link 16 pages, many post on this, and no Freightliner will NOT reimburse you ..
__________________
Bob & Karen & Buddy "yourkie"
2008 Winnebago 39W Destination DP
2015 Jeep Grand Cherokee
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08-25-2020, 10:16 AM
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#5
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Senior Member
Fleetwood Owners Club Freightliner Owners Club
Join Date: Feb 2012
Location: Central Arkansas
Posts: 1,362
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Thanks Bob...for the thread link. I couldn't remember, but you were the guy who found and posted the SS 3737 AND the wiring diagram of the clutch fan. Great info.
Thanks again.
__________________
2008 Fleetwood Bounder 38S 2022 Grand Cherokee WK Limited 2021 Polaris Slingshot R Limited
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08-28-2020, 02:35 PM
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#6
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Junior Member
Join Date: Oct 2015
Posts: 21
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Quote:
Originally Posted by kinein
Thank you in advance.
After many hours of research through the forums and many post about a service bulletin for the fan clutch issue with a Cummins isb engine.
My rig is 2008 Discovery 39r 350hp cummins motor.
There is a known issue with the electronic fan clutch and many mentions of a service bulletin. Does anyone happen to know the actual service bulletin # (and yes # is not a hashtag) in regards to the fan clutch issue or Freightliner Service Solution 3737?
Supposedly, Freightliner might cover the part for this repair. I do have an extended warranty on my rig as well.
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I was able to find the part number
https://catalog.hortonww.com/part-de...b=applications
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08-28-2020, 05:44 PM
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#7
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Senior Member
Winnebago Owners Club Nor'easters Club
Join Date: Oct 2012
Location: South Jersey
Posts: 901
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Quote:
Originally Posted by kinein
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Look back to the third post from here and you will see it
__________________
Bob & Karen & Buddy "yourkie"
2008 Winnebago 39W Destination DP
2015 Jeep Grand Cherokee
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08-30-2020, 12:04 PM
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#8
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Junior Member
Join Date: Oct 2015
Posts: 21
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The fan clutch happens to be covered under my extended warranty. Off to the shop in the morning that accepts my coverage. I was going to attempt the fix on my own, but if it is covered under my extended warranty then why do the job.
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08-31-2020, 08:51 AM
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#9
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Senior Member
Join Date: Apr 2016
Location: Edmonton Alberta
Posts: 298
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Overheating 6.7 clutch fan
Quote:
Originally Posted by kinein
Thank you in advance.
After many hours of research through the forums and many post about a service bulletin for the fan clutch issue with a Cummins isb engine.
My rig is 2008 Discovery 39r 350hp cummins motor.
There is a known issue with the electronic fan clutch and many mentions of a service bulletin. Does anyone happen to know the actual service bulletin # (and yes # is not a hashtag) in regards to the fan clutch issue or Freightliner Service Solution 3737?
Supposedly, Freightliner might cover the part for this repair. I do have an extended warranty on my rig as well.
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Have contacted Freightliner about this problem, no help.
Talked to Les about converting to a direct drive fan, for $250 he will send to ENG and they will forward info to Freightliner dealer and they will do the work. I will not receive any info for my $250.
Hard to believe that there is not a ISB 6.7 running a direct cooling fan.
Trying to reach complaint line for Eng or CEO. No luck at this time. If you have a direct line please forward to me.
Parts required
4 bolt spacer ( replaces depth of clutch fan) there is a part number for these.
Conversion plate to convert fan from 6 bolt to 4 bolt bolt on. (Horton fan did this)
30" 4 bolt fan to replace 6 bolt OEM fan. ( if required)
Please respond with any info
Thanks
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09-01-2020, 08:24 AM
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#10
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Senior Member
Fleetwood Owners Club Freightliner Owners Club
Join Date: Feb 2012
Location: Central Arkansas
Posts: 1,362
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Quote:
Originally Posted by basketball
Have contacted Freightliner about this problem, no help.
Talked to Les about converting to a direct drive fan, for $250 he will send to ENG and they will forward info to Freightliner dealer and they will do the work. I will not receive any info for my $250.
Hard to believe that there is not a ISB 6.7 running a direct cooling fan.
Trying to reach complaint line for Eng or CEO. No luck at this time. If you have a direct line please forward to me.
Parts required
4 bolt spacer ( replaces depth of clutch fan) there is a part number for these.
Conversion plate to convert fan from 6 bolt to 4 bolt bolt on. (Horton fan did this)
30" 4 bolt fan to replace 6 bolt OEM fan. ( if required)
Please respond with any info
Thanks
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Source Engineering in Oregon offer a direct fan replacement. Requires spacer as you mention. There is a thread on this somewhere...and I was sent the pn for the spacer if you need it. There are folks out there who have done the upgrade.
__________________
2008 Fleetwood Bounder 38S 2022 Grand Cherokee WK Limited 2021 Polaris Slingshot R Limited
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09-09-2020, 11:06 AM
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#11
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Senior Member
Join Date: Apr 2016
Location: Edmonton Alberta
Posts: 298
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I have found the Multi-Wing Fan Blade.
30", 9 blade, 4 bolt. Spacer is also available from them. Great people, great price for fan
$275 USD. I do have specs on OEM fan and multi-wing direct drive fan.
This fan is available at Superiorturbo.com. # 1-517-486-0001. The name is Larry Brudzynski. Fans are their business.
If you would like the specs on this fan e-mail me. I can send them to you.
OEM fan @ 25150 cfm @ 2500RPM uses 35.92 hp
Multi-wing fan 2370 cfm @ 2200RPM uses 17.39 hp
These are both 9 blade 30" fans.
If you have a Horton Fan clutch on your coach and it will fail(10% slippage, when you are pulling grades the slippage goes up and so does the temperature), replace with direct drive fan.
Call these people, great info.
Basketball
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11-30-2020, 12:25 PM
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#12
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Junior Member
Join Date: Nov 2020
Posts: 2
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Quote:
Originally Posted by mevman
Source Engineering in Oregon offer a direct fan replacement. Requires spacer as you mention. There is a thread on this somewhere...and I was sent the pn for the spacer if you need it. There are folks out there who have done the upgrade.
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Do you know the part number for the spacer? 6.7 Cummings 2008.
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11-30-2020, 12:48 PM
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#13
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Senior Member
Fleetwood Owners Club Freightliner Owners Club
Join Date: Feb 2012
Location: Central Arkansas
Posts: 1,362
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Quote:
Originally Posted by Dougb1972
Do you know the part number for the spacer? 6.7 Cummings 2008.
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I was sent this document by a friend. Page 3 has some pn's for different spacer sizes.
Good luck.
__________________
2008 Fleetwood Bounder 38S 2022 Grand Cherokee WK Limited 2021 Polaris Slingshot R Limited
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12-01-2020, 06:32 AM
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#14
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Senior Member
Join Date: Apr 2016
Location: Edmonton Alberta
Posts: 298
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See post # 11. Larry has part number and all specs Best price for fan.
Call Larry at Superior Turbo.
lbrudzynski@superiorturbo
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