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Old 01-31-2016, 09:50 PM   #1
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Cooling system

Hi, i just bought a 1995 Destiny 38' Coachmen coach with a Spartan MM2242, 8.3 Cummins, side mounting radiator, MD3060 Allison tranny. Now reading all the post who's talking about blowing exhaust gasket and even intake gasket being caused by an overheated engine, i would like to know how to check, clean, overhauling my cooling system for the peace of mind.
Thanks all
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Old 02-01-2016, 06:27 PM   #2
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Relax that old 8.3 will run a long trouble free life of 500K miles or more .
Cooling system - Rad - clean with Simple Green and I mean soak it too top to bottom and rinse - low pressure warm water and you'll see all the dirt run out the bottom !
I do mine once a year .
Unfortunately exhaust gaskets on these old Raskles are notorious for being a weak spot - did mine at 100 K miles along with the Cummins updated Manifold - not a problem since and I'm clocking 205 K .
Just bring All of your service current and enjoy the ride !


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Old 02-01-2016, 06:34 PM   #3
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Besides NHRA225's very good advice, I'd add the best way to prevent overheating is pay attention to your temperature gauge. Also, while the Allison does a pretty good job of selecting gears, when going uphill it's better to downshift than 'lug' the engine. Many a mountain I've climbed, a downshift drops the coolant temperature quickly. Learn the torque curve of your engine and strive to keep it turning in the narrow band of best power. Often the 6 speed will upshift when it really works better a gear lower.
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Old 02-02-2016, 06:54 AM   #4
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Thanks guys for all your advices, surely apply them.
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Old 02-02-2016, 09:56 PM   #5
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If your engine begins running a bit warmer than usual, the two easiest things to check are clean the cooling sandwich, replace the cooling system pressure cap if it fails a pressure test, this can be done at the same HDT parts store where a new one is available. (have them test the new one before you leave, new ones can be bad too)
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