Question about 2006 Volkswagen Touareg
Low compresion on one cylinder on 2.5 tauareg diesel engene
Low compression can be caused by either worn or stuck piston rings or by a valve seating problem (which can be in the valve seat, a worn cam or in the rocker/push rod assembly between them). The way to determine is to start with a cool engine (meaning the rings are dry), run compression test on the cylinder in question (or all if you like, I would) then put a little bit of oil in the cylinder/cylinders and re-run the test. If the compression comes up it is the rings. If not it is in the valve not seating properly. Of course after you put oil in the cylinders when you start the car don't be alarmed at it smoking for a couple of minutes until the oil burns out. That's normal.
Posted on Nov 13, 2009
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Posted on Jan 02, 2017
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