Crankcase Breather Hoses - Mercedes Benz SLK Forum

SLK R170 General Discussion SLK 200, SLK 230K, SLK 320, SLK32 AMG

 1Likes
  • 1 Post By DIYGirl
 
LinkBack Thread Tools
#1 Old 08-13-2013
Registered Users
 
Join Date: Aug 2013
Location: Atlanta, GA
Vehicle: 2001 SLK 320
Posts: 161
Country:
Chats: 0
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Thanks: 39
Thanked 28 Times in 19 Posts
(Thread Starter)
Crankcase Breather Hoses

Need to replace the valve cover gasket and the sealant on the breather cover. The breather cover hoses are original so they are going to crack when I remove them. I have ordered a new set but have been unable to find any "how to" for changing out these hoses. Now that may seem weird to need a how to for something that simple but it is easy to see the breather end but I do not know where the other ends of the hoses are. Also, there are 4 hoses for the crankcase breather. I only see 3. When I replace the hoses, do I need sealer, gasket grease or anything else or are they auto sealing?

Any help from the group? Thanks
DIYGirl is offline  
Sponsored Links
Advertisement
 
#2 Old 08-13-2013
Registered Users
 
Join Date: Apr 2012
Location: Houston, TX
Vehicle: Mercedes SLK 230 2003
Posts: 1,613
Country:
Chats: 0
Mentioned: 11 Post(s)
Tagged: 0 Thread(s)
Quoted: 44 Post(s)
Thanks: 226
Thanked 379 Times in 265 Posts
Garage
Quote:
Originally Posted by DIYGirl View Post
Need to replace the valve cover gasket and the sealant on the breather cover. The breather cover hoses are original so they are going to crack when I remove them. I have ordered a new set but have been unable to find any "how to" for changing out these hoses. Now that may seem weird to need a how to for something that simple but it is easy to see the breather end but I do not know where the other ends of the hoses are. Also, there are 4 hoses for the crankcase breather. I only see 3. When I replace the hoses, do I need sealer, gasket grease or anything else or are they auto sealing?

Any help from the group? Thanks
Here you go a good DIY thread:
https://www.slkworld.com/slk-r170-cla...70-2001-a.html
Check this thread. It has a PDF on how to remove oil separator. I think it's for 320 though the procedure is the same:
http://mbworld.org/forums/c-class-w2...separator.html
Make sure you disconnect all the hoses and loosen all clamps from the oil separator. Then carefully remove it and you'll see where all rubber hoses connect and end =)
I didn't use any sealant when replacing mine, by thread suggests you use some silicone sealant. It's up to you.
JaysonM is offline  
The Following User Says Thank You to JaysonM For This Useful Post:
#3 Old 08-13-2013
Registered Users
 
Join Date: Jan 2013
Location: Greenville SC
Vehicle: 2008 E320 Bluetec(sold 11/14), 2001 SLK 320, 2013 E350
Other Toys: 1972 MGB, 2004 Volvo V70
Posts: 287
Country:
Chats: 0
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 6 Post(s)
Thanks: 2
Thanked 37 Times in 33 Posts
Garage
It is not normal to use a sealant on emissions hoses, water hoses, etc., etc. But do make sure that you use new clamps if at all possible.
CarolinaBluetec is offline  
The Following User Says Thank You to CarolinaBluetec For This Useful Post:
 
#4 Old 08-13-2013
Per ardua ad cineris.
 
Tolak's Avatar
 
Join Date: Apr 2013
Location: Somerset UK
Vehicle: SLK230 '99 R170
Other Toys: Clio Williams
Posts: 1,039
Country:
Chats: 0
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 10 Post(s)
Thanks: 14
Thanked 136 Times in 117 Posts
The crankcase breather system consists of two separate systems.
One is the low flow system, which uses nozzles under the inlet manifold; these nozzles and the tubes and regulating valve below them block with crud, and the hoses will break as you try to move them to investigate.
The second is the high flow system, which is apparent at the tip of the engine near the air filter; during higher flows, the oily air spins here, and the oils is spun out and recycled into the sump, whilst the air goes downstream of the filter.
When the low-flow nozzles get blocked, the low flow air doesn't have the speed to drain off the oil, and hence it gets sucked into the air system, and makes the MAF oily, compromising performance and smoothness.
There is a thread here which details the process for cleaning out the nozzles and tubes.
Happy spanner-work.
Tolak is offline  
#5 Old 08-13-2013
Registered Users
 
Join Date: Aug 2013
Location: Atlanta, GA
Vehicle: 2001 SLK 320
Posts: 161
Country:
Chats: 0
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Thanks: 39
Thanked 28 Times in 19 Posts
(Thread Starter)
Great info guys. So taking the information you guys have provided I did a search on the service manual for oil separator. There was only one mention of the oil separator in the entire manual that I could find and it was about the crankcase gasket repair.

"Magnesium cylinder head covers provide trouble-free sealing, are lighter than aluminum and dampen valve noise. They are cast in two pieces to create internal ventilation passages with oil separators for crankcase vapor ventilation.This ventilation system virtually prevents the possibility of oil sludge formation due to the retention of water vapor in the engine."

Other than remove the hoses from breather case, that seems to be a dead end as far as the manual is concerned. However, all of the post you provided listed the MAF as well. I think the MAF on the SLK 320 is located in the center at the back of the engine and the hoses all seem to head in that direction so we are getting closer to the answer.
Tolak- Thanks for the additional information on the high and low systems. Good info to know. I will look around for info on the inlet manifold and see where that gets me
DIYGirl is offline  
#6 Old 09-10-2013
Registered Users
 
Join Date: Aug 2013
Location: Atlanta, GA
Vehicle: 2001 SLK 320
Posts: 161
Country:
Chats: 0
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Thanks: 39
Thanked 28 Times in 19 Posts
(Thread Starter)
In the future if someone is looking for details on how to replace the breather hoses, I have posted a DIY for the breather hoses and valve cover gasket in the DIY thread.
JaysonM likes this.
DIYGirl is offline  
The Following 3 Users Say Thank You to DIYGirl For This Useful Post:
Sponsored Links
Advertisement
 
Reply

  Lower Navigation
Go Back   Mercedes Benz SLK Forum > Mercedes Benz R170 SLK Class Cars > SLK R170 General Discussion

Bookmarks

Quick Reply
Message:
Options
Upload your files to MEGAUPLOAD
Upload your images to ImageShack

Register Now



In order to be able to post messages on the Mercedes Benz SLK Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
User Tag List

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
Oil separator change with all hoses (r170 2001) Kolandr SLK R170 class DIY 3 10-25-2015 10:32 PM
Engine Breather QSHIP SLK R171 General Discussion 15 10-15-2014 10:13 PM
Vacuum hoses offdepp SLK R170 General Discussion 0 03-08-2012 09:57 PM
Engine Vacuum Hoses r170 offdepp SLK R170 General Discussion 4 10-04-2011 12:12 PM
Antifreeze smell/porus hoses? markwade SLK R170 General Discussion 4 06-17-2011 10:15 AM

Posting Rules  
You may post new threads
You may 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 On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome
 

Clubs, Garage Plus vBulletin Plugins by Drive Thru Online, Inc.