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so did the Koreans cut corners to keep costs down?
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That might be the case, I personally have seen 2 other failed pumps and heard of about 4-6 more in other countries, a bit much for my liking.
Anyway, here a link to the updated
rotary vane vacuum pump, which is not interchangeable with the piston style pump (has an oil feed and different adaption to the timing gear).