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thomandcoley

Cummins 6.7L overheating issues Forest River Berkshire 2009

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The New owners of Coaches that plan to be traveling farther from their home base are not aware of some helpful items that will enhance usable information  beyond what is offered at the instrument panels.

I understand that there is going to be a FMCA University available to members only in the near future, that hopefully will fill in some knowledge gaps.

So, stay tuned and keep an eye on the home page for information as the process evolves.

Rich. 

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Latest update: Cummins in Salt Lake says it needs fan hub. And that the radiator needs to be removed and cleaned out and doing all that will take about 35 hours @ $150 an hour. Yep. $6800.  I seriously need a second opinion and someone to help in Salt Lake ASAP as we need to be in Colorado by Friday night. Another place said he didn't think you needed to remove radiator to fix fan hub. Cummins tech said fan hub was "restricted" and not moving properly.

Also I can see more than just the hole in the fan shroud from inside the bedroom floor - around it looks clean. Maybe I am looking at the radiator?  I need to take pics. 

 

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52 minutes ago, thomandcoley said:

Latest update: Cummins in Salt Lake says it needs fan hub. And that the radiator needs to be removed and cleaned out and doing all that will take about 35 hours @ $150 an hour. Yep. $6800.  I seriously need a second opinion and someone to help in Salt Lake ASAP as we need to be in Colorado by Friday night. Another place said he didn't think you needed to remove radiator to fix fan hub. Cummins tech said fan hub was "restricted" and not moving properly.

Also I can see more than just the hole in the fan shroud from inside the bedroom floor - around it looks clean. Maybe I am looking at the radiator?  I need to take pics. 

 

If you do it yourself at least you know it's done right as the shops don't care if your out of $10,000 with nothing to show for it.  Limp it home and start removing pieces of the rear of your coach until you get the rad and cac out. You can have the rad tested at a radiator shop and clean the air cooler yourself.   After that the fan hub will be easy to get out.  Stop paying the big shops that don't care.

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I had the Horton fan clutch replaced on my previous Cummins ISB while at the Freightliner Service Center in Gaffney. They did the one year maintenance, replaced the shocks and replaced the fan clutch all in an 8 hour day. They did not remove the CAC and radiator to change the fan clutch.

 

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15 hours ago, thomandcoley said:

Also I can see more than just the hole in the fan shroud from inside the bedroom floor - around it looks clean. Maybe I am looking at the radiator?  I need to take pics. 

 

NO, you are not looking at the radiator from the bedroom.  As has been mentioned several times you are looking at the FRONT of the CAC (Charge Air Cooler). The radiator is behind (toward back of the coach) the CAC.

You chassis maker (If Freightliner, call Gaffney) is the one who can absolutely tell you what the correct (minimum) process is for replacing the fan hub.

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What you need to do is to replace the fan clutch. I wouldn't do anything else right now.

 What you need to do is to replace the fan clutch. Anything else is added profit for the dealer. 

 What you need to do is to replace the fan clutch. 

Bill

 

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Kay, I believe he has one of the electric actuated clutches. The video is a good one on installing an adapter to replace the original fan clutch. Making it a full time direct drive, eliminating the clutch.

Bill  

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15 hours ago, thomandcoley said:

Latest update: Cummins in Salt Lake says it needs fan hub.

Thanks Bill I agree, Cummings shop is telling him that it needs a fan hub. Were it mine I would only replace the fan clutch, and only after the CAC and radiator have been thoroughly cleaned and the problem still persists. I have a new fan clutch sitting on my desk that I will be replacing on the Jeep this weekend. I've seen more fan clutches go out over the years than I care to remember. On a Fred it is much easier to determine this, as you just drive faster to see if the coolant cools down with additional speed.

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5 hours ago, wolfe10 said:

You chassis maker (If Freightliner, call Gaffney) is the one who can absolutely tell you what the correct (minimum) process is for replacing the fan hub.

I agree, call this number and ask how many hours labor and cost of the part.  Have your VIN ready.

 Freightliner Service and Training Center, Gaffney, SC.

(855) 253-0421

If you're a member of FCOC,  you will receive a 10% discount at most shops.

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Hey all - Can't thank you enough for all the great info. 

After taking it to Cummins to be checked out, the super qualified technician there left off my radiator cap. Shortly after departing the place, my friend driving behind me called and alerted me to steam coming out of the back. So I had Cummins send their mobile tech out with more coolant. He put 7 gallons in it!!!!! 

This morning, we sprayed the CAC and radiator with Simple Green Extreme, some dirt came out but the water was mostly clean and clear after soaking it really good. Drilled a hole in the bottom to let it drain (will be plugging it up later today). My buddy said he could see light coming through the radiator once I started spraying the Simple Green.

That did not solve the problem. We departed and maybe 10 minutes in, it was already overheating, not towing the car, on relatively flat ground. 

While on the side of the road waiting for it to stop overheating, the mobile tech from the previous day just happened to be passing by (how odd!) and stopped to assist. Hooked computer up to it, had me rev it up til it was 210 degrees. He couldn't over ride the fan with the computer to make it come on, tried a couple different things. He said the fan clutch is shot. At 210 degrees, the fan was just spinning freely.  Also, he didn't charge me for his time.

My friend suggested adding an extra cooling fan as he has one on his hot rod. We mounted it on the radiator in the back.  That did not solve the problem.  

We have the fan clutch ordered, arriving tomorrow. We made it to Spanish Fork, UT and the mechanic here said he can get the part in the morning (which by the way is $300 less than the one from Cummins, even though coming from same place!) Also his hourly rate is about half of what Cummins rate is. He says he can try to replace it without removing radiator and CAC.  Hoping this FINALLY solves the problem!

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The FINAL update! Again, thanks for sharing all of your vast knowledge, you all are the best!

FINAL VERDICT: Fan clutch. $650 part

A guy named Don at Spanish Fork Diesel Repair in Spanish Fork, UT got us in quick and the final bill was $989 versus $6800 at Cummins. Who, by the way, was gonna charge us $952 for the part. Grrrrr. They said they would HAVE to remove the radiator and all to fix it. Not so. Don fixed it from the access hole under the bed.

We are heading to Creede CO now to headline the Headwaters Music Festival Saturday and Sunday. We made it over the mountain passes towing a car and the hottest it got was maybe 212. At 210 we heard that big ol' fan motor kick in and it dropped the temp right away. 

 

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On 8/22/2018 at 10:53 AM, WILDEBILL308 said:

What you need to do is to replace the fan clutch. I wouldn't do anything else right now.

 What you need to do is to replace the fan clutch. Anything else is added profit for the dealer. 

 What you need to do is to replace the fan clutch. 

Bill

 

Got it! SPOT ON! Don't have to tell me a 4th time! 

 

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10 hours ago, thomandcoley said:

They said they would HAVE to remove the radiator and all to fix it. Not so. Don fixed it from the access hole under the bed.

Some shops will not do anything that requires them to work from inside a motor home, so there's a good chance they saw removing the radiator as the only route to the repair site. Not saying I agree with their approach (pun intended) but I do understand the reluctance of shops to send a grease-covered mechanic to work from inside a motor home that costs as much as some do nowadays. Especially if their bread-and-butter is working on commercial vehicles. Only takes one or two expensive carpet or upholstery damage claims to scare a shop from working through the hatch in the bedroom floor.

Glad you got it resolved. Sometimes a motor home owners best tool is perseverance and determination.

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The fan clutch was the suspect by several of us. Glad that you finally found a fix. What an experience for you folks.

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My 98 ISB has a solid mount fan so I don't have to worry if its working or not.  I think they started putting clutches on when there were complaints that the fan made noise like a B29 going down the runway to take off.

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DD, I believe they came along with the electric clutch technology, now we also have water pumps with clutches to speed them up and slow them down for MPG :o

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In most of my 18 wheelers, I had an on/off toggle switch to over ride the sensor. When starting up a steep grade on a hot day, I turned the fan on early. I have known big fleet tractors to shutoff on a steep grade on a hot day. The temp rose so rapidly, that when the fan kicked on, it was too late to recover the cooling system before shutoff point. Have seen it many time in deserts out west on summer days. Sometimes well over 110 degrees. Guess the big fleets did not think that the driver was smart enough to handle something as complicated as an on/off switch. Also used it when Idling with the A/C on. 

I remember temps as hot as 121 degrees. OK! Maybe only 120.😎

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