It seems that since I sold my truck and went back to school (at the ripe old age of 56), which forced me to use my 240 as 'everyday transportation,' I've had quite a few minor problems crop up from a leaky water pump to a flat tire (brand new Yokohama winter tire), to some leaky vacuum lines, to a broken odometer gear, to a leaky rear main seal. My son and I pulled the M47 and replaced the seal, but the clutch was already slipping at the time and had some oil contamination. My son cleaned the clutch and flywheel. The clutch had been replaced only a few thousand miles beforehand in the summer because of a previously leaking rear main, so it is almost new. Since the new rear main seal was replaced, I've been using the car mainly to drive a short distance back and forth to school, and I haven't noticed any oil leakage under or around the car. Today I took it on an extended highway drive and found that once everything warmed up, the clutch would chatter and slip if it was under a bit of load at highway speeds. I checked when I got home, and there was no oil leakage evident. This is my hypothesis, and I'm wondering if I'm right: The clutch still has some oil contamination in it, but it doesn't slip until things get warm and the oil loosens up a bit on the clutch surface.... Am I going to have to pull that gearbox again????
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