 Good comments so far. The only stand-alone factory installed vent pipe for a 720D was for those tractors that were electric start. It bolted onto one of the tin covers formerly covered by the pony engine footprint. Otherwise, on pony equipped engines, the venting takes place up from the main case, through the pony engine block, then up to and through the pony air cleaner. What you might have seen was an older "G" or "A" type vent screwed onto the oil filler nipple in the first reduction gear cover. But.... If someone has added the vent to their pony start diesel to improve crankcase venting, it is most likely just a stop gap, short term improvement, as lack of vent capacity points directly toward excessive blow-by, and the only cure for that is rings and or pistons, i.e. returning the engine to an acceptable level of mechanical sobriety. Sorry to say, but it sounds like your diesel needs a bit of internal work. To your immediate question, I do not see a serial break for the vent pipe, except that it showed up in the parts book when the electric start came available with the introduction of the black dash models. Since an electric start had no pony motor, there was no protected route to vent, so they added the stand alone pipe. Now, I have seen a worn-out diesel with a vent pipe plumbed into the air intake so the diesel "re-burned" the vented flow gases. It would most likely keep one from dripping oil. HTH. Frank
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