The Ford Barn

Larry in Ark. · 06-29-2011, 08:51 PM

Working on Trico vacuum wiper motor. When it's on the car with a steady 19" of vacuum according to my gauge, I can't get it to move. With it still on the car I hook a hand vacuum pump to it showing 10 - 11" of vacuum, and it just moves back and forth fine. I don't understand it. Any ideas? Can someone explain to me why it does this???
Thanks. Any help is appreciated.

BILL WILLIAMSON · 06-29-2011, 09:15 PM

Try the hand pump up to 19 and see if it stalls.
Remove hose from wiper, disconnect metal vacuum line from manifold, run a skinny mechanic's wire up through metal piping and then blow it out. Might have restricted flow from insects or leaf rollers inside pipe.

Kurt in NJ · 06-29-2011, 09:23 PM

When you are checking the vacuum do you have it hooked up with a "T" ---perhaps there is a restriction somewhere between the engine and the wiper.

Larry in Ark. · 07-01-2011, 09:02 PM

Thanks for the responses. I took a direct line from the manifold to the wiper and it works great. Also took a wire and air and went through the lines inside the car. They are clear. But when I hooked the wiper back up to the hose going through the car to the manifold, it won't work. I've got reproduction hose and lines and I'm wondering if they are the right size. I don't know if there are specs on the original ones or not. The hose makes 2 90 degree turns, one out the windshield, the other back to the wiper. Would this have anything to do with my problem?
Thanks again.
Larry

joe plumber · 07-01-2011, 10:03 PM

Make sure the hoses aren't kinked at the 90 's.

Kurt in NJ · 07-01-2011, 11:25 PM

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Another thing to look at is the compression fittings on the metal pipes, perhaps they have crimped the pipe, or the holes in the fittings were not drilled properly.

RonC · 07-02-2011, 06:36 AM

Try this. Use 3 and 1 oil. The original Trico oil is similar to 3 and 1 oil. Hook a rubber tube up to the wiper and manually work the wiper blade (you can leave the motor attached to the car). This will cause the wiper to "suck" though the rubber tube. Put the end in some 3 and 1 oil (pour some in a small cup) and suck some into your wiper motor. Inside your motor is a leather rectangular "paddle" that swipes in a semi arc inside the half circle case. The oil helps to keep this paddle pliable which provides a better seal between the paddle and the case.

06-29-2011, 08:51 PM	#1
Larry in Ark. Junior Member Join Date: Aug 2010 Location: Omaha, AR Posts: 19	Vacuum wiper motor Working on Trico vacuum wiper motor. When it's on the car with a steady 19" of vacuum according to my gauge, I can't get it to move. With it still on the car I hook a hand vacuum pump to it showing 10 - 11" of vacuum, and it just moves back and forth fine. I don't understand it. Any ideas? Can someone explain to me why it does this??? Thanks. Any help is appreciated.

06-29-2011, 09:15 PM	#2
BILL WILLIAMSON Senior Member Join Date: Dec 2010 Location: FRESNO, CA Posts: 12,560	Re: Vacuum wiper motor Try the hand pump up to 19 and see if it stalls. Remove hose from wiper, disconnect metal vacuum line from manifold, run a skinny mechanic's wire up through metal piping and then blow it out. Might have restricted flow from insects or leaf rollers inside pipe. __________________ "THE ASSISTANT GURU OF STUFF" Last edited by BILL WILLIAMSON; 06-29-2011 at 11:37 PM.

06-29-2011, 09:23 PM	#3
Kurt in NJ Senior Member Join Date: May 2010 Location: on the Littlefield Posts: 6,159	Re: Vacuum wiper motor When you are checking the vacuum do you have it hooked up with a "T" ---perhaps there is a restriction somewhere between the engine and the wiper.

07-01-2011, 09:02 PM	#4
Larry in Ark. Junior Member Join Date: Aug 2010 Location: Omaha, AR Posts: 19	Re: Vacuum wiper motor Thanks for the responses. I took a direct line from the manifold to the wiper and it works great. Also took a wire and air and went through the lines inside the car. They are clear. But when I hooked the wiper back up to the hose going through the car to the manifold, it won't work. I've got reproduction hose and lines and I'm wondering if they are the right size. I don't know if there are specs on the original ones or not. The hose makes 2 90 degree turns, one out the windshield, the other back to the wiper. Would this have anything to do with my problem? Thanks again. Larry

07-01-2011, 10:03 PM	#5
joe plumber Senior Member Join Date: May 2010 Posts: 820	Re: Vacuum wiper motor Make sure the hoses aren't kinked at the 90 's.

07-01-2011, 11:25 PM	#6
Kurt in NJ Senior Member Join Date: May 2010 Location: on the Littlefield Posts: 6,159	Re: Vacuum wiper motor Sponsored Links (Register now to hide all advertisements) Another thing to look at is the compression fittings on the metal pipes, perhaps they have crimped the pipe, or the holes in the fittings were not drilled properly.

07-02-2011, 06:36 AM	#7
RonC Senior Member Join Date: May 2010 Location: Rhode Island Posts: 1,868	Re: Vacuum wiper motor Try this. Use 3 and 1 oil. The original Trico oil is similar to 3 and 1 oil. Hook a rubber tube up to the wiper and manually work the wiper blade (you can leave the motor attached to the car). This will cause the wiper to "suck" though the rubber tube. Put the end in some 3 and 1 oil (pour some in a small cup) and suck some into your wiper motor. Inside your motor is a leather rectangular "paddle" that swipes in a semi arc inside the half circle case. The oil helps to keep this paddle pliable which provides a better seal between the paddle and the case.