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Transmission Vacuum Modulator adjustment.
I'm getting ready to replace the transmission vacuum modulator and will need to adjust it properly. What's the size of the bolt where I have to put the nipple to attach the hose with the gauge? PeachPartsWiki says to use an ALDA banjo bolt. But unfortunately I don't have one and there are no diesels in the YJ's close by to grab one from. Thanks.
PeachPartsWiki: Transmission Vacuum Modulator Adjustment
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1979 Black on Black, 300CD (sold), 1990 Black 300SE, Silver 1989 Volvo 780, 1988 300CE (vanished by the hands of a girlfriend), 1992 300CE (Rescue). |
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My typical with every new modulator is give it @ least 1 full turn clockwise...if the transmission is having Issues/slipping or otherwise worn I give it 3 full turns (3 lbs of pressure for each full, 360 degree turn). Leave the white cap off, keep the T bar Safe so you can make more adjustments with out Fighting after you test drive. Nice crisp, positive shifts make for a happy, long lived transmission. Jono Sent from my SM-G960U using Tapatalk
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Blue Ridge Mercedes Jonathan Hodgman http://www.blueridgemb.com/ Enthusiast Service, Restoration & Tuning. Follow Us on Facebook! Located in the Atlanta area Specializing in all pre and post merger AMG's including Hammers and DOHC M117 engines. Mercedes Repair Atlanta |
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Thanks! Installing was a breeze, getting the cap off not so much. For some reason it won’t come off, I wiggled where the slot is, but no success.
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1979 Black on Black, 300CD (sold), 1990 Black 300SE, Silver 1989 Volvo 780, 1988 300CE (vanished by the hands of a girlfriend), 1992 300CE (Rescue). |
#4
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The old style modulators with their rubber caps were So Much nicer to work with...:-/ Jono Sent from my SM-G960U using Tapatalk
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Blue Ridge Mercedes Jonathan Hodgman http://www.blueridgemb.com/ Enthusiast Service, Restoration & Tuning. Follow Us on Facebook! Located in the Atlanta area Specializing in all pre and post merger AMG's including Hammers and DOHC M117 engines. Mercedes Repair Atlanta |
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Good idea, I will put it on my jy list.
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1979 Black on Black, 300CD (sold), 1990 Black 300SE, Silver 1989 Volvo 780, 1988 300CE (vanished by the hands of a girlfriend), 1992 300CE (Rescue). |
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Didn't found the right nipple or banjo bolt yet to do a proper adjustment. So I followed Jono's advise and turned it one turn when I installed it and after a 10 minute drive gave it three more full turns because it was shifting to soft. A fourth full turn made the shifting worse. It shifts nice and crisp now.
Decided to do a flush as well as the oil was pretty dark and dirty, even that I did a flush about 15K miles ago when I just got the car. It clearly needed a flush, the filter and bottom of the pan had a thin layer of metal residue. No large metal parts or slivers. Will take it for a ride tomorrow and report back.
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1979 Black on Black, 300CD (sold), 1990 Black 300SE, Silver 1989 Volvo 780, 1988 300CE (vanished by the hands of a girlfriend), 1992 300CE (Rescue). |
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You can typically run less pressure with F. Good news on no chunks! Jono Sent from my SM-G960U using Tapatalk
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Blue Ridge Mercedes Jonathan Hodgman http://www.blueridgemb.com/ Enthusiast Service, Restoration & Tuning. Follow Us on Facebook! Located in the Atlanta area Specializing in all pre and post merger AMG's including Hammers and DOHC M117 engines. Mercedes Repair Atlanta |
#8
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3 pounds of pressure per full turn? That is very interesting. I have read many posts about the modulator and have never seen that before. Is it in the FSM someplace?
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