HOW TO: M271 60K mile, 100K km crackcase ventilation overhaul.
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Joined: Jul 2005
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From: Sydney, Australia
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.
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.
Coolant link always breaks (very cheap) Left side of engine
Photo of intake
Photo of worn out air intake hose
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.
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.
Coolant link always breaks (very cheap) Left side of engine
Photo of intake
Photo of worn out air intake hose
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; Oct 15, 2012 at 03:35 AM.
