HOW TO: M271 60K mile, 100K km crackcase ventilation overhaul.
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W203 slightly modified
DIY: M271 60K mile, 100K km crackcase ventilation overhaul.
There are hoses and joiners all over the place. Weaving its way between the manifold and the cylinder head is a 1/2 inch hose. Squeeze it and if it feels hard or mushy its gone bad.
There is also another hose between the rocker cover and the intake manifold.
This is a 4 or 5 hour job. You need to loosen the intake manifold, use a hoist and also replace the coolant link as it normally snaps when touched.
Look at the attached photos when I did my friends overhaul.
Covers off, airbox removed.
![](http://benzmodz.com/mbworld/m271-1.jpg)
Parts kit
* Valve
* Crank hose
* Cam hose
* Elbow shaped hose
* Joiner hose to valve
* Special preset clamps (avoids over-tension)
* Manifold gaskets
* Fuel injector O-rings if you dismantle the fuel rail.
![](http://benzmodz.com/mbworld/m271-2.jpg)
Coolant link always breaks (very cheap) Left side of engine
![](http://benzmodz.com/mbworld/m271-3.jpg)
Photo of intake
![](http://benzmodz.com/mbworld/m271-4.jpg)
Photo of worn out air intake hose
![](http://benzmodz.com/mbworld/m271-5.jpg)
The end result was a massive improvement in fuel economy and significant torque improvement between 1000rpm - 2000rpm (below the supercharger cut-in).
I was using 98 octane fuel and I reset the engine controller with the diagnostic and cleared the learning. I made an ignition correction by specifying only 93 RON fuel and higher.
PARTS LIST
A 001 997 69 90 Clamp 13mm (tension limited)
A 005 997 27 90 Clamp 15mm (tension limited)
A 271 018 14 82 Hose
A 271 018 03 29 Valve
A 271 018 15 82 Hose
A 271 141 08 80 Manifold gasket
A 271 016 04 81 Molded hose
A 271 018 12 82 Breather hose
A 005 997 62 90 Loom tie
A 014 997 68 45 Injector seals
A 013 997 91 45 Injector seals
A --- --- -- -- Coolant hose connector
It is advisable to use all of these parts.
There is also another hose between the rocker cover and the intake manifold.
This is a 4 or 5 hour job. You need to loosen the intake manifold, use a hoist and also replace the coolant link as it normally snaps when touched.
Look at the attached photos when I did my friends overhaul.
Covers off, airbox removed.
![](http://benzmodz.com/mbworld/m271-1.jpg)
Parts kit
* Valve
* Crank hose
* Cam hose
* Elbow shaped hose
* Joiner hose to valve
* Special preset clamps (avoids over-tension)
* Manifold gaskets
* Fuel injector O-rings if you dismantle the fuel rail.
![](http://benzmodz.com/mbworld/m271-2.jpg)
Coolant link always breaks (very cheap) Left side of engine
![](http://benzmodz.com/mbworld/m271-3.jpg)
Photo of intake
![](http://benzmodz.com/mbworld/m271-4.jpg)
Photo of worn out air intake hose
![](http://benzmodz.com/mbworld/m271-5.jpg)
The end result was a massive improvement in fuel economy and significant torque improvement between 1000rpm - 2000rpm (below the supercharger cut-in).
I was using 98 octane fuel and I reset the engine controller with the diagnostic and cleared the learning. I made an ignition correction by specifying only 93 RON fuel and higher.
PARTS LIST
A 001 997 69 90 Clamp 13mm (tension limited)
A 005 997 27 90 Clamp 15mm (tension limited)
A 271 018 14 82 Hose
A 271 018 03 29 Valve
A 271 018 15 82 Hose
A 271 141 08 80 Manifold gasket
A 271 016 04 81 Molded hose
A 271 018 12 82 Breather hose
A 005 997 62 90 Loom tie
A 014 997 68 45 Injector seals
A 013 997 91 45 Injector seals
A --- --- -- -- Coolant hose connector
It is advisable to use all of these parts.
Last edited by benzmodz; 10-15-2012 at 03:35 AM.