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#1
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+++ Tranny Question +++
The car : 1967 250s, AT 230sl 4 speed
The tranny slips up to 4th then OK. Shifting manualy do's NOTHING. I need to know something before I start "fidling" in there. If the diaphragm was shot (or blocked vacum line), would I be able to shift manualy? Will change AT filter as soon as I'm done fixing the brakes. Comments welcomed. DAN
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http://w3.uqo.ca/gravelle/images/250S/flood.jpg DAN 1967 250s The Monster Project a.k.a "The Monster" a.k.a "Rolling Coffin" --sold-- The photographic ART thread +++Price Guide+++ |
#2
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Properly conditioned modulator pressure is critical to those old trannies.
There is a rubber diaphram that failed regularly in the modulator. There also is a device called a double lifting solenoid on the top of the trans. There are three positions, idle, full throttle and everywhere else. The everywhere else position is the unpowered state; meaning the solenoid is powered to the other two positions. The solenoid moves a linkage that attaches to the modulator and the three positions creats three wildly different ranges of modulator pressure. You should verify the modulator pressure with a gauge and if much less than spec verify that the linkage is in the right position. There is an access cover under the tunnel rug on the right side. Makes a hole the size of a grapefruit at the top.
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Steve Brotherton Continental Imports Gainesville FL Bosch Master, ASE Master, L1 33 years MB technician |
#3
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Thanks for your promp reply.
From your answer, the modulator and/or double lifting solenoid will affect the manual shifting capability as well... correct? Should I eliminate valve body malfonction?
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http://w3.uqo.ca/gravelle/images/250S/flood.jpg DAN 1967 250s The Monster Project a.k.a "The Monster" a.k.a "Rolling Coffin" --sold-- The photographic ART thread +++Price Guide+++ |
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