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Trico Vacuum Wiper Motor question
#1
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Richard Lambert
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On my 32 Victoria when I bought it the wipers were parked to the outside of the windshield, see attachment #1. I rebuilt both motors and now they park to the inside, see attachment #2.
My question is; what controls the parking stop?
I have enclosed a diagram but still can’t figure it and I rebuilt one at a time so no parts interchanged.
Thanks,
Richard

Attach file:



jpeg  A570B6B9-4C02-478A-B4BC-035BC10A03C5.jpeg (272.58 KB)
4382_6041696195137.jpeg 1944X1944 px

png  E99F0056-52DB-41A2-94FB-51F6F923FD8C.png (3,017.19 KB)
4382_6041698f246a0.png 1920X1439 px

jpeg  CD3E827D-268D-42ED-9536-6D31B90AEC96.jpeg (365.95 KB)
4382_604169ea93816.jpeg 2592X1943 px

Posted on: 3/4 18:13
1930 Packard 734 Speedster Sedan
1932 Packard 900 Light Eight Sedan
1934 Packard 1101 2/4 Coupe
1932 Packard 903 Deluxe Victoria
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Re: Trico Vacuum Wiper Motor question
#2
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John
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Seems like all you need to do is switch the motors from side to side??

Posted on: 3/4 20:25
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Re: Trico Vacuum Wiper Motor question
#3
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Richard Lambert
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Yes, I thought that also but the vacuum hose hooks up on one side only so you have a left and right motor. There has to be something I did to both that changed it???

Thanks

Posted on: 3/4 20:31
1930 Packard 734 Speedster Sedan
1932 Packard 900 Light Eight Sedan
1934 Packard 1101 2/4 Coupe
1932 Packard 903 Deluxe Victoria
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Re: Trico Vacuum Wiper Motor question
#4
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HH56
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It does look like the motors are reversed side to side but if the hose connection is fixed and that motor is constructed like later motors I can't think of anything you could have done internally to change the way the motor works.

Typically the way the later wipers work is when the wiper is turned on a slide valve moves so vacuum is connected to a passage which goes to the middle port in the shuttle valve mechanism in the center of the motor. On variable speed motors the working passage under the supply valve is in the form of a tapered slit so the more the valve moves, a wider area of the slit is uncovered to allow more vacuum being admitted so the faster the motor goes. As the paddle moves side to side, an overcenter spring mechanism flips the shuttle valve back and forth to connect the center source passage to passages going to each side of the paddle. The spring mechanism flips the shuttle valve a few degrees before the end of the sweep so it can reverse the center connection and connect to the other side passage to pull the paddle in the opposite direction.

When turning the motor off the slide valve is moved to a position where vacuum is cut off to the shuttle valve or working port but is then connected to another passage in the lid which goes to the designated park side of the motor. Vacuum will pull the paddle all the way to that side usually past the point where the shuttle valve flips. There is probably a small seal on the side of the paddle that will touch the park passage outlet in the lid so vacuum will hold the paddle solidly against the park passage to lock it in place and prevent vacuum leaking into the regular running passage that is going to the shuttle valve.

Posted on: 3/4 21:04
Howard
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Re: Trico Vacuum Wiper Motor question
#5
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Richard Lambert
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Well this is kind of embarrassing, after studying several photos of 32’s convertibles, I can see they are mounted upside down not like they are mounted on a closed car. πŸ˜€πŸ˜€

Posted on: 3/4 21:10
1930 Packard 734 Speedster Sedan
1932 Packard 900 Light Eight Sedan
1934 Packard 1101 2/4 Coupe
1932 Packard 903 Deluxe Victoria
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