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By texasmark1 - 16 Years Ago
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rebuilt the vac wiper motor on my 57 Fairlane, reinstalled, worked, now a short time later (just as I'm about to get the car inspected and registered), it seems like the motor is just not strong enough to operate the wipers. I've greased the cable/pulley assemblies as much as possible; the assembly turns by hand ok, but when I install the motor, it just barely will move, and then, not completly thru one cycle without some help... have I lost some vac pressure somehow? how much should I need? the line comes off the intake and goes straight to the wiper motor or can be plumbed thru the fuel pump... either way gets the same weak result... HELP please don't tell me to get an ele motor after I have taken the time to buff and hand-bend steel lines to plumb this thing!! thanks,Mark
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By paul2748 - 16 Years Ago
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The only thing I can suggest is to "swell" the "paddle" inside the unit- they can dry out.
You can do this by pouring some brake fluid (not silicone) in a small glass jar. Stick the hose going into the wiper unit into the brake fluid and manually operate the windshield wipers through five or so up/down cycles. Let sit for twenty four hours. Hopefully the wipers will work. I know a couple of guys who have done this and it worked out great.
What the brake fluid does is swells the leather( I think) paddle in the unit which will seal it against the walls of the unit. Put some plastic on the floor mat directly under the wiper unit in case of any leakage. Another possibility is some white smoke out the tailpipe for a short while.
Some use other liquids for this - ATF, MMO. I think the brake fluid works best.
Let me know how this works out.
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By texasmark1 - 16 Years Ago
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good idea, but my "paddle" has rubber edges, not leather; rebuild calls for silicone grease in the "tank" in which the paddle rides back and forth; I've done this during the rebuild; the unit seals up nicely, works freely when actuated by hand and will run the wiper mech. without the blades in place, but when I put on the blades, it acts like it just doesn't have enough power to run them back and forth... I wonder if I have enough vacuum to operate them. I know from my childhood memories that vac wipers are not as consistent as electric, that they slow down when you step on the gas and are generally slow, but I can't seem to get mine to even work enough to pass inspection here in Texas. Don't plan to get the car out in the rain, but I've got to have wipers when its inspected... any more ideas fellas?? thanks,Mark
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By simplyconnected - 16 Years Ago
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Install the tomato juice can with a check valve like power brake units have. You can put it anywhere, but preferably close to your Trico unit. It will sustain good vaccuum for a little while longer, through accelleration. Hope this helps. - Dave
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By texasmark1 - 16 Years Ago
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sorry... "tomatoe juice can..."?? guess I'm not old enough for that term... please elaborate... thanks,Mark
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By PF Arcand - 16 Years Ago
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Check that you don't have a collapsed or obstructed vacuum line. Also, is your cam stock or near stock? Aggressive cams often have low vacuum. Is the fuel pump vacuum diaphragm working o.k.?
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By Ted - 16 Years Ago
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texasmark1 (5/28/2009)
sorry... "tomatoe juice can..."??guess I'm not old enough for that term... please elaborate... Vacuum can.
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By simplyconnected - 16 Years Ago
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Did you ever look under the hood and see a can, usually black, that looks EXACTLY like a big tin can? It looks like a big V8 or tomato juice can so that's what we call it. I guess you can say it's an old term. We started using them with the onset of power brakes. They accumulate vacuum so the brake booster still works for a few pumps, even if the engine is off. They can do the same for your Trico motor.
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By Brodie - 16 Years Ago
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If you don't have one, you might try a dual-action fuel pump.
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By Hoosier Hurricane - 16 Years Ago
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I thought brake boosters had their own vacuum reservoir and a check valve in the 3/8" vacuum hose that supplies it. I also thought the tomato can was for the heat/air cond. system so that it wouldn't switch from cool to hot when you stepped on the gas. Seems the tomato can only had a 1/4" feed hose, which isn't much to supply vacuum to the brake booster. Guess I'd better check my manual and see if I'm thinking correctly.
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By texasmark1 - 16 Years Ago
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thanks for the ideas... to respond, -stock cam -no tomatoe can -new fuel pump with two ports on top, one marked "wiper"; I have this one plumbed to the wiper motor; the other port is plumbed to the intake manifold guess I need a vacuum gauge to check my amount of vacuum and see if its in fact too low to operate the wipers. I can put one wiper arm on and it almost works... just seems like I need more "ummph" from the vacuum supply... Mark
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By timmy4 - 16 Years Ago
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This might help some one before I put my wiper motor in my car I tested it by putting it on a air conditioning vaccume pump and it worked good of course with no load on it and when i installed it it works fine. When you rebuilt your pump where did you get the gaskets?
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By texasmark1 - 16 Years Ago
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made my own gaskets out of manilla folder material...! used the old ones for a pattern, cleaned the thing up, repacked with silicon grease... closed it up and tried it out before putting it back on the car... worked fine... still wonder if I just don't have enough vacuum to run them...
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