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Old 09-16-2014, 04:49 AM   #1
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ISC Overheating

Dutch star 2003 350 ISC Mod 4004 overheats on pull up I 68 Mt Savage area Headed for Kysers Ridge north. Have a 2010 Crv in tow. Usually about 95 and humid outside when I make this run. Oil, coolant, ok and intake fan clear. Anyone had this prob. 68K on engine. Thanks
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Old 09-16-2014, 02:29 PM   #2
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Hi and welcome to the forum.

I have moved your post here into its own thread to avoid hijacking the thread it was posted in.

When pulling steep grades, do you downshift to keep the RPM around 2000? That's the ticket for a lot of us to avoid overheating on long pulls.

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Old 09-16-2014, 02:45 PM   #3
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Quote:
Originally Posted by fastman View Post

Dutch star 2003 350 ISC Mod 4004 overheats on pull up I 68 Mt Savage area Headed for Kysers Ridge north. Have a 2010 Crv in tow. Usually about 95 and humid outside when I make this run. Oil, coolant, ok and intake fan clear. Anyone had this prob. 68K on engine. Thanks
What is the coolant temp when you say it overheats?

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Old 09-16-2014, 03:06 PM   #4
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Howdy!

Is this a new behaviour or has it always done it?

Obviously, this can be caused by several sources. Water pump, thermostat, hydraulic pump (if it's a side radiator), fan speed controller (if it's a multi-speed fan).

Charting out all the various conditions that seem abnormal will help a shop debug the issue...

Steve
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Old 09-20-2014, 10:24 AM   #5
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Really not enough info to make a good answer.
What gear are you in when you are pulling this grade? Did it do this before? What rpm are you running on the hill?
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Old 09-20-2014, 10:35 AM   #6
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Really not enough info to make a good answer.
What gear are you in when you are pulling this grade? Did it do this before? What rpm are you running on the hill?
Bill
Agreed, more info needed.
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Old 09-20-2014, 10:58 AM   #7
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Lot's of questions and no answers. Haven't heard back so maybe the problem is no longer a problem.

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Old 10-07-2014, 09:31 PM   #8
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Ours started running hotter than it used to. Cleaned out the radiator stack and the problem is cured. I was amazed at the amount of pine needles that came out from between the radiator and CAC.
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Old 10-13-2014, 08:21 PM   #9
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Sounds like the charge air cooler may be dirty/clogged and
needs to be cleaned. This is routine annual maintenance.
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Old 11-10-2014, 07:19 PM   #10
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Quote:
Originally Posted by RickO View Post
Hi and welcome to the forum.

I have moved your post here into its own thread to avoid hijacking the thread it was posted in.

When pulling steep grades, do you downshift to keep the RPM around 2000? That's the ticket for a lot of us to avoid overheating on long pulls.

Rick
Most interesting question though .... as we made our first run in our 03 - 500HP TS temps maintained very well .... some headwinds enroute brought the temps up a bit but stayed within from what I understand to be normal operating temp 200 - 205 ... coming out of Flagstaff AZ however when climbing quite a ways, she moved up to the 225-230 area. left it in cruise as I thought it would down shift as necessary .... but got concerned as we reached the peak and pulled off and let it idle to cool .... which it recovered nicely ....
How to manage this engine temp is what the question mite be ... is 2k the number ... or a bit higher to keep the water pump spinning ... or ???
Gearing down to maintain a better RPM makes sense to me ... but these engines I've not dealt with ... some more info would certainly be welcomed ...
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Old 11-10-2014, 08:32 PM   #11
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Welcome to IRV2.

I also have a ISC 8.3 in my 2001 Alpine with a side radiator. I had some overheating problems when I first purchased it new. I was advised as others have mentioned is to gear down and to back off on the accelerator. This stopped my overheating issues.

Depending on the grade and the length of the of the climb I have shifted as far down as 2nd. Usually only 3rd or 4th. I do not worry if it takes a few extra minutes to get to the top. Besides I get to enjoy the more of scenery.

I have found that when traveling with friends the first to the top slows down so everyone else can catch up even if I am the first one to the top I slow for others I am traveling with. No sense being in a hurry when you are retired.
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Old 11-10-2014, 09:51 PM   #12
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Dave,

If you are gearing down to second, you definitely have something wrong with your cooling system. Even when my hydraulic pump was failing badly, I was able to do an 8 mile 6% grade and only be down in third at the top (and this in the heat of summer). Now that the pump is replaced, I am back to being able to do the 12 miles of the Grapevine (6% grade) all in 4th gear.

My concern would be that at some point, you are going to have it get really bad and be stuck somewhere...

Steve
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Old 11-10-2014, 11:11 PM   #13
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Not when you are pulling a 8% grade with switch backs.
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Old 11-11-2014, 08:52 AM   #14
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Dumb question, but have you tried cleaning the radiator and CAC yet?
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