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vacuum wiper pump, electric replacement...

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tomj View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote tomj Quote  Post ReplyReply Direct Link To This Post Posted: May/28/2018 at 11:04pm
Originally posted by scott scott wrote:

Rain X the windshield. Makes a huge difference, I hardly use the wipers in the rain.


oh, i did! you are correct -- it makes a HUGE difference. it would have been a nightmare drive without it. even in heavy-ish rain, the crap wipers were only an inconvenience.

i'm surprised how well it works. i tried it some 20 years ago, and dont remember it being that effective. maybe it's better now, maybe i did a more careful job applying it.

1961 roadster american
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T5z, 3.42:1 mustang axle
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Post Options Post Options   Thanks (0) Thanks(0)   Quote tomj Quote  Post ReplyReply Direct Link To This Post Posted: May/28/2018 at 11:13pm
mixed up: well in a fit of paranoia i today ordered a nice large vacuum reservoir from Summitplus i have the big pump coming from Jegs. my plan is to install the can (friday), see how long it will run the wipers after the car turns off or i pinch the hose (as a test) and if adequate, not install the $200 pump and return it. its wasteful to pay shipping etc but 2, 3 weeks on the east coast without wipers -- even with rain-X!

vinny: the Carter pump puts out up to 7 psi, too much for the Weber carb, which wants 3-4 PSI max, so i have a small carter pusher pump. so i had it installed only for the vacuum side. it's an ooooold pump, i rebuilt it probably 10 years ago, and now the diaphragm is leaking, again. so it's not a "quality" thing, but cost and effort.

farna: the outlet on the little pump was only for tiny vacuum signal hose, like 3/32".  the thing was the size of an aquarium pump! i did't 'rake it out of the box, i didnt want to install it and find it inadequate and have to eat the cost.

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tomj View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote tomj Quote  Post ReplyReply Direct Link To This Post Posted: May/28/2018 at 11:15pm
greyhound: yeah, pretty much :-) 75 mph cruise in 5th leaves me running 10 in hg or less manifold vacuum, so not a lot for the wipers. i'm hoping the fancy juice can solves it.

news at 11 as the saying goes.

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Post Options Post Options   Thanks (1) Thanks(1)   Quote tomj Quote  Post ReplyReply Direct Link To This Post Posted: Jun/01/2018 at 9:19pm
OK, so i installed the reservoir. this thing from Summit: https://www.summitracing.com/parts/sum-g1464b/overview/. nicely made, decent size, comes with checkvalve so it's better than i could make myself.

i tore down, again, my wiper motor. it was a bit sluggish. turns out i had used a too-heavy oil last time. got it spotless, 600 grit all the sealing surfaces, lubricated it with synthetic DOT3 brake fluid. that seems about perfect as a lube.

the $230 pump from Jegs worked great, but i returned it. it's heavy, noisy, somewhat bulky, was going to need cluttery wiring and plumbing. it would however be a great match for the reservoir; with the vacuum switch (supplied) downstream of the tank it would have run the wipers at full speed with no engine assist -- but if the exhaust of the pump was plumbed to the manifold it wouldn't run often at all. too much junk under the hood though.



the reservoir by itself is probably not really adequate, but i'm going to live with it. it's good for maybe one full back and forth sweep. i tested by pinching the manifold hose flat while it was running.

my wiper motor, when off, leaks a bit. very little; but it leaks the reservoir down in 30 seconds to a minute. should the seal absolutely off? it's not like a brake booster, which will hold vacuum overnight, those have check valves. the wiper motor has a little sliding rubber valve held in place with a weak spring. i think mine's within the realm of "normal".

whatever, this is what i'm living with.




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Post Options Post Options   Thanks (0) Thanks(0)   Quote farna Quote  Post ReplyReply Direct Link To This Post Posted: Jun/03/2018 at 11:48am
That sliding on-off valve will leak a little, can't get a 100%positive seal there, so you're probably withing the "normal" range. I just did the math on the size of your reservoir -- right at 1/2 gallon, so same size as the "juice can" 80s/90s Ford reservoirs (but looks nicer). The good thing is the reservoir doesn't have to power the wipers completely by itself -- there will always be a little vacuum unless your foot is on the floor. So the wipers will slow down when pulling but shouldn't stop, but could on a long hill or hard acceleration. If you get caught in the rain you need to slow down anyway, so shouldn't be too bad. Rain-X the windshield also and you should be good to go! Looking forward to seeing you.
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Post Options Post Options   Thanks (1) Thanks(1)   Quote tomj Quote  Post ReplyReply Direct Link To This Post Posted: Jun/27/2018 at 12:22am
OK! so back home from the 2018 Power Tour, and a handful of actual rain storms. here's my experience:

the tin can resevoir from Jegs was enough. not perfect, but adequate. it provides about a full second of operation (even engine off). easy to plumb, cost effective, etc.

whoever i read that said brake fluid was a good wiper motor lubricant -- WRONG. it evaporates/gets sucked in/soaks in/disappears. a week later, after finding the motor not just inoperable but making loud sucking sounds -- internally it was COMPLETELY DRY. why did i listen to idiot pontificators on youtube.

i cleaned it and re-lubed with 10W30, all i could find. two weeks in, at least, it works fine, in fact, better than before.

next time apart, i'll use my favorite thin oil, Mobil1 0W10 or whatever it is. and axle grease on the sliding valve on top.

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T5z, 3.42:1 mustang axle
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Post Options Post Options   Thanks (0) Thanks(0)   Quote rms827 Quote  Post ReplyReply Direct Link To This Post Posted: Jun/27/2018 at 1:45am
Thanks for sharing, Tom. Thumbs Up   I've got this one bookmarked in case I run into issues with my own wiper motor.

Brake fluid...  5 to 1 since DOT 3 and 4 are hydroscopic, it just "evaporated" in the rain and humidity back there.
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"You can think I'm an idiot, just don't talk to me like I'm one." - Batman
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Post Options Post Options   Thanks (1) Thanks(1)   Quote farna Quote  Post ReplyReply Direct Link To This Post Posted: Jun/27/2018 at 6:27am
FYI -- axle grease on the slide valve because it has to fit a little loose in order to move, and the grease is thick enough to act as a seal as well as a lube.
Frank Swygert
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DocCreer Quote  Post ReplyReply Direct Link To This Post Posted: Jul/02/2018 at 5:37pm
So you just used the juice can
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