Quote:
Originally Posted by Samuel M. Ross
... then both of our 1980 MBZ(s) [240D & 300D] VCV(s) have the same kind of defect despite the fact that these cars' transmissions are function quite well. As a mater of fact the 300D just came back from the tranny rebuilders where a leak was repaired under warranty AND while they had the car they made it a point that they also tweaked the associated engine/tranny vacuum control system adjustments for they find the installing field mechanics often do not know how to do this very well. They made no mention of a defective VCV.
If while working with my independent MBz mechanic here in town I find that these vacuum bleed characteristics I have reported earlier are not normal for a VCV, I'll be the first one to announce this to those who read this THREAD.
Regards,
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Since my experience is with the later 617 engines and my comments refer to the performance of the SD, it's entirely possible that the VCV on the earlier vehicles was of a different design and construction and permitted a very low level continuous bleed. If both vehicles are performing in an identical manner, the credibility of this theory is reinforced.
We need more data from others that have the older 617 and 616 engines for final confirmation.