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What is wrong with this M110 ?
Hello folks,
I have a euro W126 280S with an engine rebuilt 80 000km ago. This is a fact. My compression test show 11.3 bars +/- 0.2 bars for 5 cylinders and ONE cylinder (number 3) at 8 bars ![]() My first reaction was : broken ring ![]() The plug tends to oil foul in that cylinder but not really oil soaked, just dark - humid ![]() The coolant looks ok if a bit smelly. Could this be a head gasket without a leak into the coolant ? The idle is rough but the engine turns over quite smoothly at some speeds. Could a valve be cracked ? I had to install thinner pressure pieces to get the valve gear to be in spec. Maybe a valve was damages... Any tips/ diagnostic approaches appreciated before I decide to pull the head. Cheers Denis Lion sur Mer France |
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