Go Back   iRV2 Forums > MOTORHOME FORUMS > Class A Motorhome Discussions
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 02-28-2016, 07:53 PM   #1
Member
 
Join Date: Feb 2013
Posts: 98
slobber tubes

when or what year did slobber tubes stop being an issue? What was the issue, my understanding is that it made the radiators dirty and hurt the cooling? What is the fix if I buy an rv with a slobber tube? appreciate it
__________________

__________________
Quincybear is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 02-28-2016, 07:59 PM   #2
Senior Member
 
Monaco Owners Club
Holiday Rambler Owners Club
Join Date: Jan 2013
Location: michigan-tip of the mitt
Posts: 1,382
I think slober tubes ended about the time DEF had to be added to the mix. The green solution was to send the slober back to the crankcase for a closed system and no slober into the air. If you have a slober tube you can fabricate a catch canister and mount it on the end of the tube. Just remember the tube MUST be able to breath so don't mount it with tube at the bottom of the canister.
__________________

__________________
HR 29 fks TT, 1 slide, Chevy Silverado
Next stop?
t55watson is offline   Reply With Quote
Old 02-28-2016, 08:06 PM   #3
Senior Member
 
Join Date: Nov 2003
Location: Richmond Hill, GA USA
Posts: 671
You can also just extend the slobber tube further toward the rear of the motorhome so that the fumes do not get pulled up into the radiator. Use same size or larger hose, and be sure it always runs downhill. That's the way mine is done.

Fred
__________________
Fred & Vicki
St. Augustine, Fl.
Fred Cooper is offline   Reply With Quote
Old 02-28-2016, 08:09 PM   #4
Senior Member
 
Ray,IN's Avatar
 
Join Date: Aug 2001
Location: North America somewhere
Posts: 13,699
This "slobber tube" is a crankcase ventilation system that exhausts any pressure in the crankcase to the open air. Newer systems are called a positive crankcase ventilation system, meaning they route this pressure to the engine intake system and burn this "blowby". This should not be an issue on a low mileage MH, so if you see oil in the fins of a rear radiator, I would investigate further and find the cause of the blowby.
The cheap and workable solution to slobber tube blowby creating an oily mess on the rear radiator sandwich is to connect something like an empty water bottle to the bottom of the slobber tube/crankcase ventilation tube, but leave room for vapors to get out of the water bottle but still trapping oil that gets blown out.
I have seen a few guys connect a plastic tube to the slobber tube and run it to one side of the MH instead of fooling with the water bottle.
Of course if you buy a MH with a side radiator this is not an issue. Mine has a slobber tube and a side radiatior, so if it begins to have oil in the blowby, my wife's car will show oil the front.
__________________
2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA 1SG, retired;PPA,Good Sam Life member,FMCA."We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert the Constitution. "Abraham Lincoln"
Ray,IN is offline   Reply With Quote
Old 02-28-2016, 09:23 PM   #5
Senior Member
 
Pigman1's Avatar
 
Join Date: Sep 2011
Posts: 1,938
We had a 2005 Diesel Bounder with a Cat C-7 that had slobber problems. Cat made a unit that took the slobber output and ran it through a small filter and returned the oil to the crankcase. I installed it and it ran fine for 70,000 miles. Our 2008 Allegro Bus had a Cummins and the positive crankcase vent, and it worked well too.
__________________
Pigman
2013 Tiffin Allegro Bus 43QGP
2011 Chevy Silverado 1500 Toad
Pigman1 is offline   Reply With Quote
Old 02-29-2016, 07:03 AM   #6
Senior Member
 
Monaco Owners Club
Join Date: Sep 2013
Posts: 696
Quote:
Originally Posted by Pigman1 View Post
Cat made a unit that took the slobber output and ran it through a small filter and returned the oil to the crankcase.
Cummins also offers the same thing. ISC Open Crankcase Ventilation Kit CV50116
__________________
2007 Monaco Signature Noble III 45' ISX 600HP
hypoxia is offline   Reply With Quote
Old 02-29-2016, 07:56 AM   #7
Senior Member
 
Join Date: Mar 2009
Posts: 448
The issue was that some chassis/engine manufacturers left the end of the slobber tube in front of the rear radiator surface. The easy fix was to either extend the slobber tube with an extension hose redirecting the oily mist away from the radiator; or add some type of oil catching enclosure. As long as you were made aware of the issue before gumming up the radiator surface, the DIY fix was 1 hour & less than $25 materials.


Quote:
Originally Posted by Quincybear View Post
when or what year did slobber tubes stop being an issue? What was the issue, my understanding is that it made the radiators dirty and hurt the cooling? What is the fix if I buy an rv with a slobber tube? appreciate it
__________________
Jim2 is offline   Reply With Quote
Old 02-29-2016, 08:04 AM   #8
Senior Member
 
Join Date: Feb 2011
Location: Snowbird - Waterford Mi and Citrus Springs Fl.
Posts: 3,609
^^^That's the take away here.^^^

It's not that big a deal, especially if you do your own maintenance. Just be aware of the potential for the issue. If you happen to run across one that's not been done, make sure you have a good look at the front (engine) side of the CAC/radiator. If the normally thin fins look a little thicker than they should, plan on spending an afternoon cleaning up a gooey mess.
__________________
1997 37' HR Endeavor, 275hp Cat, Freightliner
03 CR-V Blue Ox, Ready Brake
ahicks is offline   Reply With Quote
Old 02-29-2016, 09:32 AM   #9
Senior Member
 
ChasA's Avatar
 
Join Date: Mar 2007
Location: Apex, NC
Posts: 1,857
I think the slobber tubes went away with engines conforming to 2007 emissions requirements.
__________________
2010 Winnebago Journey Express 34Y
2010 Freightliner XCS (mfd 9/'09)
'07 Saturn Vue V6
ChasA is offline   Reply With Quote
Old 02-29-2016, 08:23 PM   #10
Senior Member
 
FIRE UP's Avatar


 
Join Date: Dec 2009
Location: Out there, somewhere
Posts: 5,270
Well gang,
Unless I missed it in reading all the responses, while blow-by is a part of the engine operation, there's a primary cause of EXCESSIVE blow-by oil mist on the CAT engines. And that cause is, INCORRECT amount of oil installed when either initially installing the oil in the first place or, replacing it when the oil is changed.

You see, we'll take a CAT C-7 for example. On about 99.999999% of the CAT C-7, 300/330/350 HP engines, the oil pan is designed and setup for a grand total of 19 quarts of oil, PERIOD!! There are many write-ups on this issue. CAT, and or Freightliner improperly setup or, just didn't setup the correct markings on the dip stick for these engines. And, it was left to the owners to change the oil, install 19 quarts and, mark the dip stick as such.

When the correct amount of oil is installed, you will have almost ZERO OIL MIST exiting from that slobber tube. And, it also helps to extend it. Good luck.
Scott
__________________
2004 ITASCA HORIZON 36GD, 2011 GMC Sierra 1500 4x4 Toad '08 GL 1800 Gold Wing
Retired-29.5 yrs, SDFD, Ham - KI6OND
Me, Karla and the Sophie character, (mini Schnauzer)
FIRE UP is offline   Reply With Quote
Old 02-29-2016, 09:12 PM   #11
Senior Member
 
Join Date: Feb 2011
Location: Snowbird - Waterford Mi and Citrus Springs Fl.
Posts: 3,609
Yes, there's the potential for the wrong dip stick to have been installed when new. Properly marking yours at an oil change a good plan.

But, without minimizing the potential for an over filled oil pan, to believe a 3126 with 19qts. in the pan isn't going to have some mist coming out of the slobber tube, especially while making full power, would be a mistake. It's not like there's a river of oil coming out of it, but with no extension in place, there's PLENTY enough to coat a CAC/rad over a period of time.

Correct dip stick length still a good point though. If you end up with a Cat, checking the markings at oil change time would be a good plan.
__________________
1997 37' HR Endeavor, 275hp Cat, Freightliner
03 CR-V Blue Ox, Ready Brake
ahicks is offline   Reply With Quote
Old 02-29-2016, 10:06 PM   #12
Senior Member
 
Pigman1's Avatar
 
Join Date: Sep 2011
Posts: 1,938
Quote:
Originally Posted by ahicks View Post
Yes, there's the potential for the wrong dip stick to have been installed when new. Properly marking yours at an oil change a good plan.

But, without minimizing the potential for an over filled oil pan, to believe a 3126 with 19qts. in the pan isn't going to have some mist coming out of the slobber tube, especially while making full power, would be a mistake. It's not like there's a river of oil coming out of it, but with no extension in place, there's PLENTY enough to coat a CAC/rad over a period of time.

Correct dip stick length still a good point though. If you end up with a Cat, checking the markings at oil change time would be a good plan.
I agree 100%. If the vent is open there will be blowby through valve stems and normal engine operation with parts bathed in oil. Placement of the vent (slobber) tube and airflow through the rear radiator picks up this oil laden air and runs it through the radiator CAC stack depositing the oil on the fins. Radiator cleaning is a constant requirement unless the slobber tube is extended and the oil/air separator is installed.
__________________

__________________
Pigman
2013 Tiffin Allegro Bus 43QGP
2011 Chevy Silverado 1500 Toad
Pigman1 is offline   Reply With Quote
Reply



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Where to buy the EGR tubes on a 1996 460 mrhockey Ford Motorhome Chassis Forum 2 12-02-2011 06:58 PM
Rusty Fuel Filler Tubes on '03 36MDDS rdownward Alpine Coach Owner's Forum 2 10-15-2011 11:00 AM
Installing torque tubes on the old 460 Wanabee FTer Ford Motorhome Chassis Forum 8 11-05-2010 08:18 PM
Water tubes vibrating behind shower jimmccreary Winnebago Industries Owner's Forum 15 05-19-2010 11:11 PM
How many tubes to grease dengraham Freightliner Motorhome Chassis Forum 4 09-21-2008 07:02 PM

» Virginia Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 05:09 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.