BenzWorld Junior Member
Date registered: Sep 2011
Vehicle: 1966 250S
Location: Austin, TX
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250s leaking head gasket staining block
Can anyone help diagnose the leaking/staining that appears to be coming from the head gasket down the side of the engine block in my '66 250s (photo attached). I would definitely assume it's a blown gasket, but I'm not seeing any of the normal telltale signs (steam in exhaust, oil in coolant, coolant in oil, loss of oil or coolant) and until quite recently the car was running just fine despite the apparent seepage. This has been happening a lot more slowly than the picture makes it seem... that's accumulated staining over months, maybe even a year.
Since I wasn't suffering any other symptoms I had just been just keeping an eye on this, but recently the car lost significant power after I crested a steep hill. Since then it idles fine, but then wants to stall out in gear unless I rev it and ride the clutch. I've checked out all of the more obvious causes (fuel and air delivery is fine, no detectable vacuum leaks or exhaust blockage). Kind of run out of ideas, and it has me circling back to this mess on the side of the engine block.
Basically I'm really hoping someone can tell me that the two issues might not be related, but I'm running out of ideas for what could be causing the new problem, and if I need to replace the head gasket, I might as well stop wasting time searching for the problem and get started.
Is it possible for a head gasket to fail like this without other symptoms? Could seepage like this be indicative of anything other than a failed gasket? Any help or guidance would be greatly appreciated.