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Old 05-22-2019, 12:00 PM   #1
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Oil blowout from overflow tube on a Cummins diesel

Have a class a coach, freighliner chassis with a 300 Cummings diesel. I see posts about oil blow-back from overflow tube. 38' 2006 Sportscoach, purchased new, now 31,000 miles.

Question
1. Does Cummings make a fix like Caterpillar that fixes the problem? They have an overflow can attached to side of motor with a filter and a tube running the oil back into the motor crankcase. The oil is never exposed, and the oil is recirculated clean.


2. What is the best fix other than that? And can i fix it myself?

Links or advice? Thank you.

David
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Old 05-22-2019, 12:08 PM   #2
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The best thing, IMO, is to run the draft tube into a "catch can" and empty the can every so often. You really don't want the old dirty oil going back into the engine/exhaust.

Of course blow-by is not a good thing (a little is normal) but if there is a enough oil blowing out the draft tube to have you worried, you may have a bigger problem coming your way.
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Old 05-22-2019, 12:11 PM   #3
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I don't know but I can share this story. A truck I was driving years ago was emitting fumes into the cab. I asked the owner to extend the blow by tube beyond the back of the cab.

The tube clogged causing extreme use of oil. On a 1.5 hour trip the truck used 4 jugs of oil! We removed the extension and oil usage returned to normal.
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Old 05-22-2019, 12:51 PM   #4
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https://www.google.com/search?q=slob...w=1152&bih=649


Do some searches on Slobber Tube. I took a blast bottle from a finished Peanut Butter Jar, cut the holes in it to slide the tube into, and for ventilation, and also zip tied it via Macgyver'd zip tied it to the tube. Have emptied it once, just for grins.

I did find that with our ISL, that when the tech adds in the full amount spec'd by Cummins - that the engines spits out about two quarts. As long as I've had the coach now, it always likes to settle and run between oil changes, about two quarts low. So, I now ask the Tech's to not top it off. The few times they do, is when I'd get some residual dripping on the pavement as the engine adjusted to where it wanted to be...

You can also buy commercial products for the slobber tube:

https://www.amazon.com/Universal-Res.../dp/B01B9G0BW0

But, the Skippy Jar works just as well!

Best to you,
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Old 05-22-2019, 01:39 PM   #5
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Quote:
Originally Posted by Smitty77 View Post
https://www.google.com/search?q=slob...w=1152&bih=649


Do some searches on Slobber Tube. I took a blast bottle from a finished Peanut Butter Jar, cut the holes in it to slide the tube into, and for ventilation, and also zip tied it via Macgyver'd zip tied it to the tube. Have emptied it once, just for grins.

I did find that with our ISL, that when the tech adds in the full amount spec'd by Cummins - that the engines spits out about two quarts. As long as I've had the coach now, it always likes to settle and run between oil changes, about two quarts low. So, I now ask the Tech's to not top it off. The few times they do, is when I'd get some residual dripping on the pavement as the engine adjusted to where it wanted to be...

You can also buy commercial products for the slobber tube:

https://www.amazon.com/Universal-Res.../dp/B01B9G0BW0

But, the Skippy Jar works just as well!

Best to you,
Smitty
Thank you. Good info.
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Old 05-22-2019, 02:10 PM   #6
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Quote:
Originally Posted by Smitty77 View Post
[url]
You can also buy commercial products for the slobber tube:

https://www.amazon.com/Universal-Res.../dp/B01B9G0BW0

But, the Skippy Jar works just as well!

Best to you,
Smitty
Nice find! I was going to do the skippy jar equivalent, but at the price of that aluminum / filter equipped one, just not worth hacking something together. So, bought it and will install.
Thanx for the link!
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Old 05-22-2019, 02:14 PM   #7
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Tom connected his to the exhaust. Sounds like a great idea.

Post #2
http://www.irv2.com/forums/f123/ism-...er-443752.html
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Old 05-22-2019, 02:18 PM   #8
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I would just use the catch can.
Why dump into exhaust and create a smoke trail while driving (and if you have a DPF it may damage it)?
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Old 05-22-2019, 02:57 PM   #9
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The 'Skippy Jar' (Or Jar of your choice, probably best to not be glass. And be sure low enough to not be impacted by the Exhaust Pipes. Some people put a wad of fine steel wool in the bottom of the jar too. I did not.), has been shared on many forums. Probably first read it on one of the Country Coach forums, but know I've seen it here on the Cummins, and other forums too!

That's what's so cool about these boards, everyone 'pays it forward'!

Best to all,
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Old 05-22-2019, 03:55 PM   #10
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I know the "Slobber Jar" followers think it's a waste of time and money, but I installed a Fleetguard open crankcase ventilation system that all stopped any blow by specks....

BTW.... bonus is I don't have to crawl under coach and empty a peanut jar or water bottle ...mines all maintenance free.

Check this :

https://r.tapatalk.com/shareLink?url...4&share_type=t
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Old 05-23-2019, 10:24 AM   #11
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Another trick is to afix an old cotton sock to the slobber tube. The cotton mesh reduces what blows back toward the radiator or towed car by catching much of the oil while driving. Late, while stopped, the soggy sock drips most of it off so it's ready to to catch more the next day. Crude but effective.
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