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Vacuum; Wipers
Topic Started: Sep 13 2013, 11:55 AM (957 Views)
John J
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We were talking about vacuum wipers the other day in anticipation of another step forward in the rebuild process of my 1958 CJ3B. Keep the exisitng vacuum wiper (driver's side only) or change to electric? (It has a hand wiper on the passenger side.)

I have a glass top fuel pump that also provides vacuum now, but it's not in the best of shape and may not be able to be rebuilt. As a result I was thinking about replacing it with a fuel pump that still has a glass bowl, but no vacuum. If I make this change, then vacuum wiper won't have a source of vacuum - or will it?

Can you run the vacuum line for the wiper off of the intake manifold? Mine has a small 1/4" (I believe) square headed plug in it now. It seems to me my former 1969 CJ5 (also with an F-4 engine) had a vacuum line off this same location on the intake manifold that went to the heater/defroster to change the vent direction when you changed the setting. It had the small vacuum "motor" to change the diflector in the heater box inside the cab in between the dash and firewall.

John J
1958 CJ3B
Cape Coral, Florida
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binthere
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There is one big problem with taking vacuum for the wipers from the manifold!! As soon as you step on the gas, you have no more wipers!! :angry:
somedays your the windsheild--somedays your the bug

Chuck - Cherryville B.C. Canada


53 3b [0IIIII0] stock except for wheel's and seats " a fistfull of dollars"
49 willys jeepster " a few dollars more"
and a few other retirement toys
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oldtime
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Quote:
 
There is one big problem with taking vacuum for the wipers from the manifold!! As soon as you step on the gas, you have no more wipers!!
Exactly correct !

CJ-2A uses engine vaccum for the wipers but CJ-3A and later tapped into vacuum supply from the fuel / vacuum pump.
Currently building my final F-134 powered 3B .
Rock Crawler using factory parts from the Willys Motors era (1953-1963)

http://s4.zetaboards.com/CJ3B_Bulletin_Board/topic/30228766/1/#new
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jyotin
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Yes, one may lose the wiper when connecting directly to manifold vacuum, but only for a moment or two. And when decelerating going down a hill it'll will race "backards an for'ards" like surfboard in a hurricane...

As Oldtime said -- that was the factory setup in the 2A

A lot will depend on the condition of your vacuum wiper motor. Since you only have one the 'problem' shouldn't be as noticeable as it would be if you had two wiper motors.

If it was me I'd give it a try and see how it works. Expect the wiper to slow down (or perhaps stop for a moment) when you start from a light, but you can judge whether that causes you a problem.

You could test it right now (if it was raining) by disconnecting your wiper motor from the vacuum pump and connecting it directly to the manifold and see how it's gonna (or IF it's gonna) work.
It's just my luck that something good is going to happen to me today.
54 - 3B - down on the farm
67 - cj6 - former state of Alabama vehicle
?? - cj5 T98a - made from spare parts - Ford tractor blue
?? - cj5 T98a - made from spare parts - Jeep green
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Motiv8
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Fuel pumps w/ the vac option tend to ruin the camshaft lobe due to high lever spring's resistance and marginal lube. Running straight manifold vac may be annoying to you climbing hills in the rain. Lift the accelerator a moment, clear the shield and get back on it. That's how we had to do it for yrs. Also, a vac tank installed could help. David
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oldtime
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Quote:
 
Fuel pumps w/ the vac option tend to ruin the camshaft lobe due to high lever spring's resistance and marginal lube.

I certainly don't agree with ruined eccentric fuel pump lobes.
Yes the dual action fuel pumps do have strong spring tension.
It has to be strong so that the pump lever does not float at high RPM.
I have certainly seen valve cam lobes severely worn due to lack of ZDDP addatives.
Yet I have never seen a fuel pump lobe worn down on the 134 camshaft.
The valve springs easily produce the highest PSI tension rating within the entire engine and not the fuel pump spring.
Currently building my final F-134 powered 3B .
Rock Crawler using factory parts from the Willys Motors era (1953-1963)

http://s4.zetaboards.com/CJ3B_Bulletin_Board/topic/30228766/1/#new
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Motiv8
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Oldtime,
I'd guess the surface area of the pump lobe is small compared to valve lift lobes and that's why I mentioned that as a possibility. Hopefully everyone is using some type of ZDDP. David
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oldtime
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David,
Your ideas certainly show an "in depth" understanding of inner engine functions.
But again your last statement is simply not the case for the Hurricane.
The fuel pump eccentric is actually much larger diameter (yet no wider) than the valve lobes.
Besides being physically smaller the valve lobes are far more elliptical than the fuel pump eccentric.
For this reason whenever cam wear occurs it normally will be the most pronounced upon the exhaust lobes.
Here one should realize that the intake lobes are less pronounced than the exhuast.
That is due to the dramatic intake valve diameter increase beginning with F head production.

Got that ?
It simply means the Hurricane requires less pronounced intake lobes than Go-Devil.
The Hurricane and Go-Devil exhaust lobes remain identicle.

Here is another concern that I feel obligated to shed light on before someone gets the wrong notion.
I've seen a couple posts by various persons indicating that the 134 engines have poor lubrication.
That simply is not the case.
These Willys 134 engines provide ample lubrication even under radiaclly modified conditions.
The oil pump itself is extremely dependable.
In fact many of these engine still have their original oil pumps intact.
The main lubrication concern is that one should have the .040 timing oil jet installed in place of the .070 jet.
That simple change increases oil flow to the front main bearing journal.
And know that the bypass type oil filtration is a good thing but not as desireable as a full filtration system.
Currently building my final F-134 powered 3B .
Rock Crawler using factory parts from the Willys Motors era (1953-1963)

http://s4.zetaboards.com/CJ3B_Bulletin_Board/topic/30228766/1/#new
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Motiv8
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Oldtimer,
I only mentioned that because of seeing it happen to other make engs. The lobes on cam are designed to gradually rotate the mushroom lifters. The pump lobe doesn't have that "saving" feature,therefore the possibility of galling. David
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