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Old 11-12-2019, 07:52 AM   #1
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Crankcase vent hose. Slobber

Hello Everyone.

Our new to us 2007 Revolution LE we purchased 2 weeks ago has the Cat C9 400hp engine.

I noticed on my walk around and crawl under that the engine compartment is very clean an dry, not from anyone cleaning it, except around the discharge hose from the crankcase ventilator. Our RV is a 2006 build and the engine per the serial number is PRE Emissions rollout. Our CV is an Open design where it vents to the outside. I noticed a slight and I mean very slight wetness around the end of the slobber hose and you can see that it is OEM. It discharges in level line with the bottom of the oil pan and is attached to the block so it does not move around.

The coach has not been checked yet to see if overfilled but I will do so when weather permits. I want to either put a catch can or container under the slobber hose or run it to back of coach.

Any suggestions to either method? My radiator is a side discharge so upon checking it is very clean. Just want to get any mist away from bottom of coach, engine compartment and off rear of RV.

Thank you.
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Old 11-12-2019, 08:11 AM   #2
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Breather tube mist is common on these Engines and often ignored until the compartment or Radiator become very dirty.
The solution on My 8.3 Cummins!
Attached Thumbnails
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Name:	Puke Tank.jpg
Views:	10
Size:	37.2 KB
ID:	266631  
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Old 11-12-2019, 09:08 AM   #3
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thank you

Quote:
Originally Posted by NHRA225 View Post
Breather tube mist is common on these Engines and often ignored until the compartment or Radiator become very dirty.
The solution on My 8.3 Cummins!
I like your solution. Wonder if it would work on mine as my discharge hose is just a rubber 1" diameter hose. I have seen the water bottle trick by sticking hose end into a bottle and cutting vent holes but I would like to see something a little more permanent. I know I could just add an elbow and extension to the rear of the coach as well but don't want to get any misting of oil on anything I tow.

Thank you.
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Old 11-12-2019, 09:10 AM   #4
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Breather tube solution

Great Pic.

Can you share a model number or part name and number? I will track it down.
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Old 11-12-2019, 09:21 AM   #5
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Before I installed this I was getting an oily soot on the front of my Race trailer- Now I get nothing.
See this>https://www.jegs.com/i/Moroso/710/85...hoCXmUQAvD_BwE
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Old 11-12-2019, 10:44 AM   #6
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Quote:
Originally Posted by NHRA225 View Post
Before I installed this I was getting an oily soot on the front of my Race trailer- Now I get nothing.
See this>https://www.jegs.com/i/Moroso/710/85...hoCXmUQAvD_BwE
I was looking into this very unit NHRA. Thank you. Was the inlet fitting big enough so as to now restrict the flow or cause a back flow problem in the crankcase breather function?
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Old 11-12-2019, 10:57 AM   #7
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Quote:
Originally Posted by NHRA225 View Post
Before I installed this I was getting an oily soot on the front of my Race trailer- Now I get nothing.
See this>https://www.jegs.com/i/Moroso/710/85...hoCXmUQAvD_BwE
I was looking into this very unit NHRA. Thank you. Was the inlet fitting big enough so as to now restrict the flow or cause a back flow problem in the crankcase breather function?
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Old 11-12-2019, 11:04 AM   #8
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I have the same motor with some oil around the blow by hose, nothing to worry about. When you change oil keep it between add and full, that may help. Try and change oil around 5 to 6000mi. I like synthetic oil so I use Amsoil 5w40 and use the best Cat oil and fuel filters because of the HEUI pump.
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Old 11-12-2019, 01:38 PM   #9
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Quote:
Originally Posted by 2 Stroker View Post
I have the same motor with some oil around the blow by hose, nothing to worry about. When you change oil keep it between add and full, that may help. Try and change oil around 5 to 6000mi. I like synthetic oil so I use Amsoil 5w40 and use the best Cat oil and fuel filters because of the HEUI pump.
2stroker
Agreed and thank you. We had 50 degree weather last week and weekend and its now 18 degrees and we got 11 inches of snow on Monday. Needless to say Im not digging into the engine bay anytime this week.

Thank you
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Old 11-12-2019, 01:45 PM   #10
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The line fitting into my puke tank is -12 AN and the hose is -12 AN S/S braided -- The fitting on my Valve cover is 3/4 in, I used a hose clamp to secure the hose to the valve cover fitting.
This has been on there 18 years.
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Old 11-13-2019, 05:43 AM   #11
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Quote:
Originally Posted by NHRA225 View Post
The line fitting into my puke tank is -12 AN and the hose is -12 AN S/S braided -- The fitting on my Valve cover is 3/4 in, I used a hose clamp to secure the hose to the valve cover fitting.
This has been on there 18 years.
Thank you again NHRA. Sounds like what I want. I found it and they have another identical unit with -16AN which might work a little with my unit. Close to. 1 inlet. Thank you very much.
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Old 11-16-2019, 05:50 PM   #12
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Slobber tune.

Thank you for the previous responses everyone. I checked dipstick and it is showing over the full mark and I will drain and change in spring and add the specified 34 quarts and check to see where it hits on the dipstick. To be safe I will add 30 quarts and then one quart at a time till I am between half and full.

QUESTION.

My slobber tube on my open vented crankcase breather has an ID of 1.25. I want to extend it as currently it terminated above the oil pan and in the middle of a wiring harness. I know this breather hose is not under a lot of pressure but would I create any back pressure issues if I take the hose down to 1 or even 3/4 and tie it into a collection container. Probably overthinking this but value your collective advise and opinions.
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Old 11-20-2019, 05:49 PM   #13
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Slobber tube

Stonehands,


I have a 2007 Rev (2006 build) also. I extended the breather tube with a 6" section of stainless tubing I had laying around. The only time I have oil on my tow car is when I change oil and put 34 qts in. I now put 32 qts and never have a problem. I would be reluctant to have a restriction in the breather tube. I have thought that a catch can would be nice as I still have the occasional drip from the S tube.
Dave
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Old 11-21-2019, 05:56 AM   #14
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Thank you SportTech.

My slobber tube is 1.25” I.d. And if I use a catch or recovery system as show in this post I gild use a -16AN Jose which is 1” I.d. And should not restrict the flow. I also was thinking of using stainless tubing I have in shop to extend further down out of the engine bay. Thank you for the response and thoughts.
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