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Old 10-13-2014, 06:56 PM   #1
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2006 DSDP ISL 400 Coolant Reservoir Replacement?

Coolant reservoir (coolant surge tank?) neck is corroded, which leads me to believe the coolant tank is in need of replacement. Looks exactly like a previous post by jarwiebe (picture attached). Coolant level sight glass is covered with something inside and unusable. Small weeping leak starting at the bottom of the tank where the coolant temperature plug is inserted.

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Local RV tech recommends taking the entire reservoir tank to a local machine shop where they will make a replacement stainless steel tank. Not sure how much this would cost, but sounds expensive.

Question to those DSDP owners: What have you done for this situation? I'm assuming this is a common thing. Is there a Cummins replacement part, or is this a Spartan item?

Thanks in advance,
BW



2006 Newmar Dutch Star 4320
2014 Honda CRV
2003 Honda Goldwing
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Old 10-13-2014, 07:01 PM   #2
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No problems with our 2002 DSDP/Spartan. I've got all the parts to replace the coolant hoses and coolant in ours. Taking out the stuff I put in a few years ago and going with the new OAT type coolant.
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Old 10-13-2014, 07:27 PM   #3
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Quote:
Originally Posted by BWinLV View Post
Coolant reservoir (coolant surge tank?) neck is corroded, which leads me to believe the coolant tank is in need of replacement. Looks exactly like a previous post by jarwiebe (picture attached). Coolant level sight glass is covered with something inside and unusable. Small weeping leak starting at the bottom of the tank where the coolant temperature plug is inserted.

Attachment 76479

Local RV tech recommends taking the entire reservoir tank to a local machine shop where they will make a replacement stainless steel tank. Not sure how much this would cost, but sounds expensive.

Question to those DSDP owners: What have you done for this situation? I'm assuming this is a common thing. Is there a Cummins replacement part, or is this a Spartan item?

Thanks in advance,
BW



2006 Newmar Dutch Star 4320
2014 Honda CRV
2003 Honda Goldwing
I have not done anything to my as yet. No leaks and the sight glass is fine and I can see my fluid. I just had my coach serviced and asked them to check this scaling situation. They told me not to worry if I was not running hot. I run just shy of 200 and they told me that was just where the ISL liked it. The folks that did my service are are heavy equipment & truck service center so I think I can trust their advise. Good Luck with your tank replacement.
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Old 10-13-2014, 10:25 PM   #4
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I did a search for "metal coolant recovery tank" and came up with several .....here's just one F6HZ8A080B Coolant Recovery Tank - Metal Coolant Reservoir - Value RV Parts#
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Old 10-14-2014, 05:58 AM   #5
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Sorry that this is not a response to your request for information. Rather I have a question that might be a concern to you. Have you had your coolant tested recently? It would seem that any buildup or corrosion of the tank may indicate a condition throughout the engine. Your unit is a 2006 and I was wondering if the coolant had been tested and/or replaced. My concerns would be freeze plugs, thermostat, etc. that could possible be developing the same condition. As mentioned before, the thermostat appears to be working correctly, so just a question.
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Old 10-14-2014, 07:33 AM   #6
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Quote:
Originally Posted by BWinLV View Post
Coolant reservoir (coolant surge tank?) neck is corroded, which leads me to believe the coolant tank is in need of replacement. Looks exactly like a previous post by jarwiebe (picture attached). Coolant level sight glass is covered with something inside and unusable. Small weeping leak starting at the bottom of the tank where the coolant temperature plug is inserted.

Attachment 76479

Local RV tech recommends taking the entire reservoir tank to a local machine shop where they will make a replacement stainless steel tank. Not sure how much this would cost, but sounds expensive.

Question to those DSDP owners: What have you done for this situation? I'm assuming this is a common thing. Is there a Cummins replacement part, or is this a Spartan item?

Thanks in advance,
BW



2006 Newmar Dutch Star 4320
2014 Honda CRV
2003 Honda Goldwing
I had this same issue on my 2003 GulfStream Tour Master (purchased new) last year, Cummins ISL 400. In my case the tank got a small split. Fortunately I had just pulled into my barn, so I was not stuck out on the road. I went to Freightliner and gave them the engine info. They had a new metal tank for my unit (I believe this was under $100)- They wanted two hours labor to install. I'm not a gear head, but was able to remove and install the new tank in a couple of hours. We have traveled several additional trips with no (knock on wood) additional issues with the tank. I also replaced the hoses while I did the tank. This is not a hard replacement.

Now I'm waiting on our new 2015 Ventana ETA Feb 2015

Good luck
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Old 10-14-2014, 08:23 AM   #7
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2006 DSDP ISL 400 Coolant Reservoir Replacement?

I replaced my tank on a 2001 DSDP. Called freighterliner they had the metal tank around $225. And went on you tube and watch the video on the replacement and it was about a 2 hr job.
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Old 10-14-2014, 08:31 AM   #8
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[QUOTE=1dutchstar;2269043]I replaced my tank on a 2001 DSDP. Called freighterliner they had the metal tank around $225. And went on you tube and watch the video on the replacement and it was about a 2 hr job.
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Old 10-14-2014, 10:18 AM   #9
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My surge tank on my '06 did the exact same thing and was replaced at Spartan under warranty. Now the new one again looks exactly like your picture. The tank should of been coated on the inside to keep it form rusting. You can easily remove the sight glass for cleaning. Just remove the little thin nut next to the glass and it comes right off. BTW, I added the Final Charge extender to the coolant at 3 years, as Spartan requires. Then at 6 years I drained, flushed and replaced all the coolant. It didn't make any difference, the neck is still full of corrosion.
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Old 10-14-2014, 10:54 AM   #10
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Might try to acid clean the tank out. You would need to remove the tank to clean the inside with acid you clean pools with. What about the rest of the inside of engine cooling parts? Have a 10 year old ISM engine coolant tank that is clean inside but I test once a year and replace coolant ever 3 years.
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Old 10-15-2014, 07:42 PM   #11
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Thanks for all of the suggestions.

No, I have not tested the coolant. I purchased this MH last month and changed the oil and filters. Coolant is next on my list.

Will follow-up with the suggested metal surge tank links.

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