Re: Continuing on the Overdrive
Posted by Jim Kavanagh On 2009/8/25 13:08:20
Had a bit of time this weekend, so back to work on the OD.
I pulled the solenoid (not an easy task) and tested it by grounding and connecting #4 terminal. It "machine guns" (more like jackhammers) but does not stay out.
I can't tell if that is the noise I would hear earlier when the car's speed would trip the Governor, but it is suspicious.
I assume that this could mean that the "Hold in" winding is failing, but I would like to test this separately. I am looking at the schematic (not really my thing), can I simply charge terminal #3 without damaging anything, and will that pop out the plunger and hold it in place?
I am not sure that the "machine gunning" should really affect the OD operation unless it is not holding the plunger out long enough for the pawl to engage the sun gear. Once that happens, it seems like the sun gear holds the pawl in and wouldn't require the solenoid to push the plunger any longer. Most recently, the car would not drop into OD.
I don't think the solenoid looks particularly bad (I have included a couple pictures) although the pull-in contacts are worn.
I do note as I operate this by hand, that the "ground out" contacts appear never to open. As the solenoid sits, the plunger is up (in) and pushes the bottom of the ground out contacts upward which closes them. When I move the plunger down (out) the points all drop down (as the plunger no longer contacts the bottom point of the set), the top also comes down, still maintaining a solid contact at the points (unless the plunger itself is required to complete the connection).
There is also a fair amount of travel from the disengagement of the ground out point set by the plunger top, to the point that the pull-in contacts are opened by travel of the plunger. Is this proper?
I have an early Plymouth with BW OD, the solenoid is a bit different, but the top points do not stay permanently closed.
As always, all help is appreciated as I am out of my element here.
Attach file:
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I pulled the solenoid (not an easy task) and tested it by grounding and connecting #4 terminal. It "machine guns" (more like jackhammers) but does not stay out.
I can't tell if that is the noise I would hear earlier when the car's speed would trip the Governor, but it is suspicious.
I assume that this could mean that the "Hold in" winding is failing, but I would like to test this separately. I am looking at the schematic (not really my thing), can I simply charge terminal #3 without damaging anything, and will that pop out the plunger and hold it in place?
I am not sure that the "machine gunning" should really affect the OD operation unless it is not holding the plunger out long enough for the pawl to engage the sun gear. Once that happens, it seems like the sun gear holds the pawl in and wouldn't require the solenoid to push the plunger any longer. Most recently, the car would not drop into OD.
I don't think the solenoid looks particularly bad (I have included a couple pictures) although the pull-in contacts are worn.
I do note as I operate this by hand, that the "ground out" contacts appear never to open. As the solenoid sits, the plunger is up (in) and pushes the bottom of the ground out contacts upward which closes them. When I move the plunger down (out) the points all drop down (as the plunger no longer contacts the bottom point of the set), the top also comes down, still maintaining a solid contact at the points (unless the plunger itself is required to complete the connection).
There is also a fair amount of travel from the disengagement of the ground out point set by the plunger top, to the point that the pull-in contacts are opened by travel of the plunger. Is this proper?
I have an early Plymouth with BW OD, the solenoid is a bit different, but the top points do not stay permanently closed.
As always, all help is appreciated as I am out of my element here.
Attach file:
(125.10 KB)
(86.21 KB)
(102.85 KB)
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