Hi all,

Two quick, I think, 1995 e320 questions.

1 - Is the low pressure ac port the one that is very easily accessible and near the manifold. The smaller one?

2 - Any famous last words from anyone who, like me, has been driven crazy enough by a top end tick that they opened up the valve cover and replaced the offending lifter? I have done a head gasket so I have been in there before but did not pay much attention to the lifters. Can I find the culprit by pressing down on each one and seeing/feeling which one is different? Or do I have to run the engine and watch the valves?
I saw a video on YouTube where the guy just pressed on the lifters without the car running and it was obvious which lifter needed to be replaced.

Thanks very much,
Jim Lee

can't help with the lifter question.

Normally the high pressure side is the smaller of the tubes. Higher pressure requires less area to move the freon. But trace your tubes to be sure. The low pressure should be from the evaporator (in cabin) to the compresser. High pressure runs from Compresser to the Condenser by the radiator then through the Dryer and then into the cabin.

The low side port is up top, just ahead of the front firewall, in plain view and very easily accessable. The high side port is down near the compressor/condensor/dryer. Not too bad for access, but not just sitting out in the open either.

Hi again,

I have the valve cover off and am staring at the cams and lifters. I would rather not replace all lifters. Do I just remove the torx bolts that hold the cams down and remove the cams then press down on the lifters to see which one is bad? Or do I have to actually run the engine first to find out what lifter is not lifting?

Also, is there any diy doc about removing the rocker arms on this engine?

I have the Technibooks "Mercedes W124 1985-1995" Owners Workshop manual and it has nothing about removing the cams/rocker arms.

Thanks very much,
Jim Lee

Removing the cams isn't really a diy job, unless you are a decent mechanic. You will need to remove the chain tensioner and ensure the cams are installed in the correct positionwith the cam advance rotated correctly and the camshafts torqued down properly. They are fragile and will break if you just start tightening them down out of sequence. It's not really a bad job if you have the right tools and reference materials.