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#1
08-04-2009, 06:38 PM
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Damaged plastic tranny modulator cap. Will silicone fix it?
I removed my cap to try and soften my shifts a little. After I turned the little "t", I replaced the cap then tested the line under the hood to ensure vacuum would hold. Sure enough, won't hold a vacuum anymore.
I believe I messed up the plastic cap on there. It's the white hard plastic cap, not the little black rubber one. Can I just silicone around this thing and hope for the best? Or did I over-adjust, causing failure internally?
__________________
'90 300SE --- 173k miles --- (Odometer just stopped working!) '85 Cali 300D --- 193500 miles --- (Second one) Sold Nov '10 '82 300TDT --- 236,xxx miles --- (My first one) Sold July '09 
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#2
08-04-2009, 09:40 PM
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I don't think the plastic cap has anything to do with holding vacuum. I believe you will need a new modulator. Someone will correct me if I'm wrong.
__________________
Brad 1981 300TD - daily driver 1963 Chevy II 2001 F-250 7.3 Power Stroke
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#3
08-04-2009, 10:36 PM
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If you cracked it it will need to be replaced....I doubt a silicon fix would work very well.
__________________
-diesel is not just a fuel, its a way of life-  '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k)
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#4
08-04-2009, 11:22 PM
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Dang!!
I know for a fact the modulators that have the little black rubber cap CAN lose vacuum out of the cap... the plastic ones, i dunno 
__________________
'90 300SE --- 173k miles --- (Odometer just stopped working!) '85 Cali 300D --- 193500 miles --- (Second one) Sold Nov '10 '82 300TDT --- 236,xxx miles --- (My first one) Sold July '09
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#5
08-07-2009, 01:34 AM
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Anyone try this before? I really don't want to replace this thing. Maybe I just backed the T handle out too far? Would that cause vacuum loss?
__________________
'90 300SE --- 173k miles --- (Odometer just stopped working!) '85 Cali 300D --- 193500 miles --- (Second one) Sold Nov '10 '82 300TDT --- 236,xxx miles --- (My first one) Sold July '09
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#6
08-07-2009, 03:16 AM
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UPDATE>
I rotated the pin nearly back to the position it was in before I made the adjustments... it's holding better vacuum, but it still drops quickly. I suspect after I repair the cap (it's cracked) the modulator should hold full vacuum once again... Moral: if you back out your T too much, you will loose ALL vacuum.
__________________
'90 300SE --- 173k miles --- (Odometer just stopped working!) '85 Cali 300D --- 193500 miles --- (Second one) Sold Nov '10 '82 300TDT --- 236,xxx miles --- (My first one) Sold July '09
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