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01-25-2017, 03:43 PM
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#1
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Senior Member
Join Date: Feb 2016
Posts: 309
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Rear DP Radiator Cleaning
After reading several blogs regarding overheating and multiple chemicals used to clean the hard oil/dirt build up I thought I would share what has worked very well for me. The solidified buildup is due to oil and dirt. I elected to use kerosene rather any "chemicals" that may or may not damage the CAC or radiator.
First, I used a 6" hole saw to cut access hole on the top of the radiator shroud. Used the circular piece that was cut out as a plug and two aluminum straps to fasten back in place with SS sheet metal screws (see below). 6" provided enough room for my hand and hose nozzle to fit through for rinsing purposes.
Here is my step by step method.
Remove closet floor to access fan shroud area.
Cut the 6" hole @ 12:00 in the center of the shroud.
Start engine and allow to warm to 1/4 on temp gauge. Turn engine off.
Using a spray bottle, spray kerosene through all fins from the REAR
Through your new access hole spray kerosene same as you did from rear.
Spray down all other items: fan blade, pulley(s), inside of shroud......
Allow kerosene to work for 30-40 minutes. The heat from the radiator helps the kerosene to lift the hard debris off the surfaces.
Begin rinsing with HOT water from the rear FIRST until water runs clear.
Ditto from the front along with fan, shroud and other items.
Mix Dawn dishwasher soap 50/50 with water. Repeat same steps as with the kerosene.
Rinse same as you did with the kerosene process.
Start engine and allow the water to blow back through the CAC and radiator until all water is displaced.
Make two straps, preferably aluminum: 1/2" wide x 1/8" thick x 8" long
Bridge the plug so you have four tabs extending outside the diameter, fasten to plug with 2 #10 SS sheet metal screws each strap.
I recommend drilling a pilot hole of 1/8" for the screws.
Align the plug with the access hole and install same screws to the shroud securing the tabs to the shroud.
Reassemble closet.
DONE.
*** For those with an exhaust brake its a great time to lubricate the linkage per the manual.
*** The Dawn soap mixture does two things. Cleans off all kerosene residue along with removing any final oils AND breaking down the kerosene put to the ground. (we have a gravel drive so it also reduces the weed killer needed directly under the project) Which is worse, a little Kerosene or Roundup?
Our rig, fully loaded with a 18' boat in tow, climbs the Jelico mountains at 62-65 mph and NEVER exceeds 1/2 on the temp gauge. She purrs like a COOL kitten.
Hope this helps those that can DIY
Travel safe
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01-25-2017, 05:02 PM
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#2
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Senior Member
Join Date: Jun 2012
Location: The Bluegrass State
Posts: 8,889
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Sounds like you did an exceptional job! Thanks for taking the time to write the description. I still need to cut that hole in the shroud. Do you be any chance have a few pictures you can post?
__________________
Good Luck, Be Safe and Above All, Don't Forget To Have Fun
Pete
Central Kentucky
2006 Fleetwood Discovery 35H, 2014 Honda CR-V, M&G Engineering Braking System
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01-25-2017, 06:37 PM
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#3
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Senior Member
Join Date: Feb 2016
Posts: 309
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Thanks, really cleaned very well. I inspected at night with an inspection camera to find it was 99.9% clean. The trick I found is the temperature of the radiator pre-application of the kerosene. I used "cleaners" before this method to find they did a so,so job. I tried heat with them but the product flashed off the water in the product and never cleaned. So, I figured if the "gunk" buildup was petroleum based, oil and dirt, then so should the liquid to break it down. I found the kerosene migrates under the gunk that was caked on the fins and it came off in solid pieces rather slim. Just be absolutely sure your first initial rinse is from the back towards the engine or you will push all the gunk into the radiator through the CAC. I'll get some photo's of the access hole and straps for you next time the wife has all the stuff out of the closet. So busy doing the project I neglected to take any pic's,,,, Da
One last note, youll need a solvent capable spray bottle(get at HD). The dollar store units wont take the kerosene.
Good luck and in hopes you find my process beneficial. Yes, I am an engineer,,,,
George
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01-25-2017, 07:08 PM
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#4
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Senior Member
Join Date: Jun 2012
Location: The Bluegrass State
Posts: 8,889
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Quote:
Originally Posted by discovery39s
Thanks, really cleaned very well. I inspected at night with an inspection camera to find it was 99.9% clean. The trick I found is the temperature of the radiator pre-application of the kerosene. I used "cleaners" before this method to find they did a so,so job. I tried heat with them but the product flashed off the water in the product and never cleaned. So, I figured if the "gunk" buildup was petroleum based, oil and dirt, then so should the liquid to break it down. I found the kerosene migrates under the gunk that was caked on the fins and it came off in solid pieces rather slim. Just be absolutely sure your first initial rinse is from the back towards the engine or you will push all the gunk into the radiator through the CAC. I'll get some photo's of the access hole and straps for you next time the wife has all the stuff out of the closet. So busy doing the project I neglected to take any pic's,,,, Da
One last note, youll need a solvent capable spray bottle(get at HD). The dollar store units wont take the kerosene.
Good luck and in hopes you find my process beneficial. Yes, I am an engineer,,,,
George
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I'm civil engineer, retired road/bridge design & construction.
__________________
Good Luck, Be Safe and Above All, Don't Forget To Have Fun
Pete
Central Kentucky
2006 Fleetwood Discovery 35H, 2014 Honda CR-V, M&G Engineering Braking System
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01-25-2017, 07:33 PM
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#5
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Senior Member
Join Date: Feb 2016
Posts: 309
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Masters in Mechanical, Electrical and Hydraulics over here.
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01-26-2017, 06:14 AM
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#6
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Senior Member
Freightliner Owners Club
Join Date: Apr 2004
Location: Show Low Az
Posts: 1,325
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And where did the kerosene fall ? on the ground ? polluting ? What ?
Dawn has always worked for me and many others without the pollution on the ground
__________________
Dale&Susan, 08 Alfa Gold, DaGirlsRv Blog
2015 F-150XLT_2000W Solar_800 AmpHr Lithium
Magnum_MSH 3012 & PT100
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01-26-2017, 07:10 AM
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#7
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Senior Member
Join Date: Jun 2012
Location: The Bluegrass State
Posts: 8,889
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Quote:
Originally Posted by gatorcq
And where did the kerosene fall ? on the ground ? polluting ? What ?
Dawn has always worked for me and many others without the pollution on the ground
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What proof do you have of this claim? What makes you think Dawn is any better for the environment? Or Simple Green or many other degreasers for that matter? The only part of Dawn that is biodegradable is the very small component called surfactants. The rest is non biodegradable. By the way, what exactly is biodegradable? Where does the bio stuff go after it's been degraded? Does the small amount of kerosene that is killing grass in the driveway any worse than Roundup Weed and Grass killer that would be used instead?
I am as environmentally conscience as the next guy, probably more so, but I am also a logical thinker, and I always look for scientific proof, backup or reasons to substantiate claims. I guess I should have been from Missouri, the Show Me State.
__________________
Good Luck, Be Safe and Above All, Don't Forget To Have Fun
Pete
Central Kentucky
2006 Fleetwood Discovery 35H, 2014 Honda CR-V, M&G Engineering Braking System
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01-26-2017, 08:06 AM
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#8
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Senior Member
Tiffin Owners Club Freightliner Owners Club
Join Date: Dec 2009
Posts: 762
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Do you use a tank sprayer for the hot water or do you use a hose from some other location?
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01-26-2017, 09:05 AM
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#9
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Senior Member
Join Date: Feb 2015
Location: Huntingtown, MD
Posts: 834
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Thank's for the info, I will give it a shot this spring.
__________________
Earl & Sharon, 2008 Fleetwood Expedition, ISB 6.7
1995 Jeep YJ/2013 Chevy Sonic
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01-26-2017, 02:24 PM
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#10
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Senior Member
Join Date: Feb 2016
Posts: 309
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I use a garden hose connected to the wash tube in the basement to have how water. I'm not convinced a tank sprayer has enough volume or pressure to push the gunk off the surface.
To my fellow engineer. I agree with your logic(common sense) and eco friendly concerns. I did use biodegradable water! LOL
Thanks for everyone's positive comments.
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01-26-2017, 03:07 PM
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#11
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Senior Member
Ford Super Duty Owner
Join Date: Sep 2016
Posts: 190
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Not to far off subject but the Valdez and deep water horizon major spills were cleaned up with Dawn and other surfactants.., one thing is for sure though, almost everything here on this 3rd rock from the sun, has already been here and stays here. It just changes its type of substance... sounds like a great way to clean the radiator and other components,, good job
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01-26-2017, 04:13 PM
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#12
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Senior Member
Winnebago Owners Club
Join Date: Aug 2013
Posts: 1,636
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Ah hell just pull the coach ahead after done and throw a match to the gunk on the ground and burn it off that way it won't soak into the ground.
__________________
2012 Journey 40U (Our Incredible Journey)
2008 Dodge Dakota(TOAD) 2005 Honda Shadow in TOAD
AF-1 braking system
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01-28-2017, 10:01 AM
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#13
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Senior Member
Newmar Owners Club
Join Date: Dec 2011
Posts: 724
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I've used a product called Carbon-X for years , everyone might want to research it ,it's a great cleaner (even had success cleaning walnut tree sap)
__________________
2002 KSDP 3669/Freightliner XC CHASSIS/Cummins 5.9 ISB 300hp
Joplin, MO
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01-29-2017, 05:27 AM
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#14
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Senior Member
Join Date: Jul 2010
Location: central Fl
Posts: 120
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Quote:
Originally Posted by discovery39s
Thanks, really cleaned very well. I inspected at night with an inspection camera to find it was 99.9% clean. The trick I found is the temperature of the radiator pre-application of the kerosene. I used "cleaners" before this method to find they did a so,so job. I tried heat with them but the product flashed off the water in the product and never cleaned. So, I figured if the "gunk" buildup was petroleum based, oil and dirt, then so should the liquid to break it down. I found the kerosene migrates under the gunk that was caked on the fins and it came off in solid pieces rather slim. Just be absolutely sure your first initial rinse is from the back towards the engine or you will push all the gunk into the radiator through the CAC. I'll get some photo's of the access hole and straps for you next time the wife has all the stuff out of the closet. So busy doing the project I neglected to take any pic's,,,, Da
One last note, youll need a solvent capable spray bottle(get at HD). The dollar store units wont take the kerosene.
Good luck and in hopes you find my process beneficial. Yes, I am an engineer,,,,
George
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Just curious since I've cleaned mine with Dawn & with simple green extreme. What engine is in your motorhome, is it a rear radiator, & what was the before & after coolant temps while towing?
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