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Well it all started with the blown trans ( 9-11 ), this meant pulling the engine, repairing the trans and putting it all back together in time for a show 10-3. While out the engine received a new oil pick up, and a re-install of the rear main seal. That's where we pick it up, a new and correct distributor gear, re-checking all the timing and the re-install of the front cover.

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So it was the day before the big show, I opened the shop and prepared to start the car again, this time for a complete run up to temp checking all fittings and the engine . The engine was snappy and all the gauges temps and sounds fell right in place, with no air circulation the water temp stabilized at 190 thanks to the installation of the new oil cooler. I peaked under the car and , WHAT, a oil leak! No it wasn't from the engine, in fact all those prior leaks were gone, but after a lengthy inspection I found the culprit, the sending -10 line to the cooler. I pulled it apart and the fitting that screwed into the sender had a bad oil ring, no big deal I just wend down to my local Napa and bought another, trouble was the original was so smashed it was not comparable to the new one, I took the oil ring to the shop and hooked it up, It leaked!
Back to Napa, guess what they had another that was bigger, it leaked! it was now 5:30, panic,
no fix till Monday! I missed the show, all because of a little ring. Sometimes you just have to say, theirs a reason for what happens, and move on, their will always be another show, their will never be another Pantera for me.You f*#%ing little oil ring!!!

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I recommend viton flurocarbon rubber for o-rings that are in contact with hot oil. Even harder to find are pure teflon o-rings. Hardware store o-rings may be neoprene rubber and those will not reliably seal hot oil or fuels.

Also, sealing a boss with a threaded plug normally requires a sized chamfer on the edge of the threaded hole. With a chamfer of the right size, the o-ring is forced into a triangular cross-section that squeezes the o-ring inward against the plug threads as well as tightly against the outer edge of the hole. Without a chamfer, the o-ring will be smashed flat and often splits, again causing leaks.
Your right on all counts and as before the A&N -10 viton oil ring is listed.
quote:
Originally posted by Bosswrench:
I recommend viton flurocarbon rubber for o-rings that are in contact with hot oil. Even harder to find are pure teflon o-rings. Hardware store o-rings may be neoprene rubber and those will not reliably seal hot oil or fuels.

Also, sealing a boss with a threaded plug normally requires a sized chamfer on the edge of the threaded hole. With a chamfer of the right size, the o-ring is forced into a triangular cross-section that squeezes the o-ring inward against the plug threads as well as tightly against the outer edge of the hole. Without a chamfer, the o-ring will be smashed flat and often splits, again causing leaks.

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