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05-23-2011, 06:16 PM
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#1
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Junior Member
Join Date: May 2011
Posts: 2
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Overheating 275 Cummins Diesel
I have a 2000 Fleetwood Discovery 37G with a 275 Cummins Diesel. I normally drive at 60 to 62 mph and at times when the outside temp is around 80 or above and I am putting a load on the engine by going up a grade I will get an overheat light and I can back off on the speed which brings the temp back into the normal range and the overheat light goes off. The fluid levels are fine as I just had the RV serviced. My questions are these: Is my 275 Cummins too small and this is normal? Would a complete flushing of the cooling system be a solution? Would installing an additional fan in the engine compartment be a solution? Any suggestions?
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05-23-2011, 06:36 PM
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#2
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Registered User
Excel Owners Club Retired Fire Service RVer's
Join Date: Nov 2010
Location: Farmington NM
Posts: 1,822
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A flush and inpsection is always a good start...You may be lugging the engine under a load. Cummins love to work hard but keep the rpms up to keep the fan spinning good. Try a lower gear to get the RPM's 200-300 higher. If you have overdrive turn it off while climbing as well as the AC. The thermostat may be getting stiff also.
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05-23-2011, 06:51 PM
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#3
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Senior Member
Join Date: Oct 2006
Location: Rochester NY
Posts: 2,706
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It's most likely that your rear radiator is dirty and needs cleaning. There have been lots of posts on this forum on this topic. The 'slobber' tube (engine breather) on earlier coaches is mounted before the rear radiator and throws oily mist into the radiator. Dirt then gunks it all up.
Clean the radiator before other work. Don't use a pressure washer - will bend the fins.
__________________
Don
'07 Winnebago Journey 34H - CAT C7, Koni's, MCU's, SS Bell Crank, Safe-T-Plus
'07 HHR Toad, SMI AFO, Blue OX
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05-23-2011, 08:39 PM
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#4
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Senior Member
Monaco Owners Club Tiffin Owners Club
Join Date: Mar 2001
Posts: 315
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Quote:
Originally Posted by Pusherman
It's most likely that your rear radiator is dirty and needs cleaning. There have been lots of posts on this forum on this topic. The 'slobber' tube (engine breather) on earlier coaches is mounted before the rear radiator and throws oily mist into the radiator. Dirt then gunks it all up.
Clean the radiator before other work. Don't use a pressure washer - will bend the fins.
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I agree
__________________
2010 Phaeton QTH 40'
2017 GMC Sierra Crew Cab pickup 4X4
Recon, D,2/7, 1st Cav '65
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05-23-2011, 09:20 PM
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#5
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Member
Join Date: Jul 2005
Posts: 35
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Pusherman and Acker1 are spot on. The slobber tube tends to gunk up the radiator with oil which in turn attracts dirt.
__________________
03 Winnebago Adventurer 37C
8.1 litre
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05-23-2011, 09:33 PM
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#6
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Senior Member
Join Date: Oct 2005
Posts: 1,224
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Mechanic once told me the full mud flap sends a lot of the road dust into the radiator.I extended the slobber tube behind the radiator.Also downshift to keep the rpms over 2000 helps.
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05-24-2011, 02:42 AM
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#7
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Senior Member
Texas Boomers Club
Join Date: Jul 2000
Location: Cypress, Texas USA
Posts: 8,854
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The radiator is a likely culprit, but the thermostats on this vintage of ISB failed with some degree of regularity as well.
Rusty
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05-24-2011, 03:35 AM
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#8
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Senior Member
Join Date: Jan 2011
Location: Debary Fl
Posts: 465
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Clean your radiator good, spray it down with simple green, let it sit for a bit and wash out with hose. Be careful not to bend the fins in the radiator(no pressure washer). Hint the dirt and gunk will be on the front of the radiator you will need to lift the bed to get at it continue until it is clean. As other posters have said you need to keep Cumming humming, rpm's up around 1700 or better it will make the motor happier, and you may find your fuel mileage will go up. If you have the engine book that came with your coach take a look at it I think you will find your engine builds it's bst power between 17-1900 rpm where the torque and horsepower curve meet.
__________________
Bruce Linda and Zoey
1999 ForeTravel U295
012 orange Jeep Wrangler
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05-24-2011, 04:37 AM
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#9
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Senior Member
Join Date: Sep 2010
Posts: 344
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In addition to thoroughly cleaning your radiator and CAC make sure you extend your "slobber tube"! Here's several remedies which have been used
http://www.irv2.com/forums/f124/slob...ons-75260.html
__________________
bob
2001.5 Fleetwood Discovery 37U 330HP Cat
Toad-2008 Yamaha Royal Star Tour Delux
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05-24-2011, 10:15 PM
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#10
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Senior Member
Winnebago Owners Club Freightliner Owners Club
Join Date: Dec 2010
Posts: 730
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I have to agree with everything that's been posted here. I too, have a 2000 Discovery and I went through the overheating thing last month when I drove it across country coming home from South Carolina to Reno. I put a post on here and got the same advice that you are getting. I took mine to Cummins. Had them change oil, lube, change oil in the generator, change some hoses and completely remove & clean the rear radiator. Bingo...no more overheating! It only cost me $1700.00. I'm sure you can beat that price, but I'm also sure that the radiator and the slobber tube is your culprit.
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06-07-2011, 09:50 PM
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#11
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Senior Member
Join Date: Apr 2000
Location: Crossville,TN USA
Posts: 437
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Had a '99 Discovery with same ISB engine. Total washdown of CAC the thing that looks like a radiator, but it is not and it is what you see from the rear of the coach. Slobber tube mods can be done for less than $5 and less than an hour DIY. The Simple Green washdown may take several applications---stay at it until you only see clear water. BTW, the 275 ISB is a great match for your coach relative to weight, wheel base, etc. When you get over 40,000 miles you should see an increase in MPG-we got 11 and a half plus and we towed a Blazer 4 down and did the mountains of PA,VA and TN with no sweat. Note how many '98., '99 '00 and some '01s Discoveries you see around. They are a great coach with all the guts most of us will ever need. To put your mind at ease read the Cummins manual re warranty, that will give you a hint what you can expect, Ken Roberts....
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