PLACEMENT OF LARGE O-RING
TO THE MB BRAINTRUST:
I too am experiencing oil leaking from the filter cap on my '98 E320 wagon. I isolated the leak to the filter housing and replaced filter & O-rings, re-tightend to 25 Nm with torque wrench. STILL SEAPING !!!$#&%!!!!
Here are my questions:
1) I installed a Purolator filter (made in China) from Advance. Could its cheaper quality/tolerances be related to the leaking/seepage issue? I think not, but I look forward to confirmation or convincing otherwise.
2) I have been placing the large O-ring in the groove at the ends of the threads, NOT flush with the top rim of the filter cap. That is, when I tighten down the cap, I cannot see it. Put another way, the cap is NOT squeezing the o-ring between the uper rim of the housing such that the O-ring is visible after tightening. I believe I am following rec. proceedure on placing the largest O-ring, but seek confirmation.
3) Finally, if I am placing thelarge O-ring correctly, and the cheap-o filter is not the culprit, what could it be???
Thanks for any and all insight.