Question about 2000 Renault 181

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RENAULT LAGUNA 2.2DCI 2003 MODEL EXCESS CRANKCASE PRESSURE

ENGINE RUNS FINE ON TICKOVER. TAKE THE VEHICLE OUT FOR A DRIVE AND WHEN YOU GET BACK IT HAS BLOWN THE DIPSTICK OUT AND THROWN OIL ALL OVER ENGINE. ALSO SEEMS TO BE EXCESS GREY SMOKE ON ACCELERATION.

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This is quite a common problem,especially with the 2.2 dci engine,although as usual Renault wont admit the problem.The reason your engine throws the oil after a run and not when stationary is this problem is caused by the turbo pressurising the crankcase.You can rev the engine all day but when theres no load on it then the turbo is not working at full pressure and all is well.
The cure for the problem is to fit a new rocker cover which incorporates part of the inlet manifold.The breathing system on these engines is complicated and the rocker cover has to handle both inlet gases AND exhaust gases and although no one can explain why a new cover cures it,I suspect the plastic the cover is made of is not robust enough and either becomes porous or warped and this allows gases into the crankcase,pressurising it and focing oil out either through the dipstick or it blows out the blanking plug in the timing cover.
It is not a massive job to replace the rocker cover as long as the injectors come out easily.If they dont then youre in real trouble.Good luck,Duncan.

Posted on Feb 20, 2009

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I have an identical problem with a 2.2 dci Espace 2005 AND ONLY 44000 miles. Renault agents say they have never heard of this problem & the car is out of warranty!
Did the replacement rocker cover fix the problem? My local garage have removed the rocker cover but can't see any fault with it - what should they be looking for?? Could the problem be any thing else?
Thanks
John

Posted on Jul 01, 2009

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Back pressure problem,check all breathers and breather filters then pull the pipe off the valve that connects the inlet manifold to the exhaust manifold.i think this might cure problem but its a bit difficult to diagnose when its not in front of me as it could be a piston,but modern day engines use different materials to 50/60s cars so go for the economy /emissions valve and pull the vac pipe off and try it .Cars never had all these gizmos years ago and run ok

Posted on Dec 19, 2008

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