Brains Trust Help - Vacuum Wipers

[Jordan Baker]

Hi all

Just wondering if anyone knows and can post up the proper length for the 2 mounting screws that attach the wiper motor to the windscreen frame. Its going into a C15a Cab 13.

I know the dia. is 10-32 but just not sure on the length.

Thanks

[Phil Waterman]

Hi Jordan

Sorry there are two different styles of mount Early and Late. So the result is a real mix and match.

Picture below shows both early on top is Cab 13 1942 which has four screws all a little over 1/2" the two outer attach the wiper motor to the a separate mounting plate the has the bearing tube that goes through the windshield frame. This plate is in turn screwed to the bracket that is mounted on the windshield frame.

The bottom picture shows the later Cab 13 1945 vintage which uses only the two outer bolts holes on the plate which also has the separate mounting plate the has the bearing tube that goes through the windshield frame. But in this case the mount on the windshield is drilled for the outer holes to line up, saving two screws.

I think I ended up using 3/4 screws and cutting them to length but 1/2 I think will work.

Cheers Phil

[Ganmain Tony]

Originally Posted by Jordan Baker

Hi all

Just wondering if anyone knows and can post up the proper length for the 2 mounting screws that attach the wiper motor to the windscreen frame. Its going into a C15a Cab 13.

I know the dia. is 10-32 but just not sure on the length.

Thanks

I realise your probably wanting the exact original screw Jordan, but I also did what Phil has done....found a screw with the right thread then cut it length ways to suit.

With a hacksaw and then cleaned up the end of the thread with a die..

BY the way the Vacuum wipers work well....just got to lift off the accelerator every now and again slightly....all part of the fun

[lendlease]

Did you try Ross Prince WWII Truck Parts in Queensland? I know he has NOS wiper kits for the Dodge WC's. Might be the same....worth a try anyway.

[Local Chap]

Some time ago, I got a pair of M151 Mutt vacuum wipers off e-bay, brand new in boxes. They fitted up fine to the Blitz windscreen, but I also had to buy MUTT wiper arms to match as they are splined, not retained with a nut like the Blitz. These then accept the standard Trico blades of various widths.

It seems a lot of surplus sellers won't ship out of the US these days (and get cranky if you ask!), it might be a matter of searching until you find one that will, or a helpful address within the US to relay your purchase.

EDIT: A-ha! Here's one that will ship worldwide. A bit more pricey, but if that's all that's available??

[Haridimos]

Originally Posted by local chap

Some time ago, i got a pair of m151 mutt vacuum wipers off e-bay, brand new in boxes. They fitted up fine to the blitz windscreen, but i also had to buy MUTT wiper arms...

Do you have a photo of the M151 wiper fitted on your Blitz windscreen?

..and does this work properly?

[Bob Phillips]

Just a question for those with 216 engines(Phil ??) Many years ago I co-owned a 3 ton Chev wrecker with a 216 engine. It had slow wipers and the vacuum assist brakes. I seem to recall that we were able to install a vacuum reservoir with a one way valve that would hold some additional capacity of vacuum which helped both the wipers and the brakes. Anybody tried this??

[Phil Waterman]

Hi Bob

Yes vacuum accumulators or reserve tanks work to a some extent, but it really depends on how much of the throttle you have to use to drive the truck. With my HUP the vacuum wipers work pretty well when I lift my foot or go to down shift, and because most of the time you drive that truck at about half throttle the wipers work. On my big C60S with the radio box when it had its original 216 engine the normal driving throttle was all the way on the floor or off the peddle completely you can guess the results no wipers or wipers.

I tried an accumulator can about 4 gallons, with a one way valve in line to the wipers the problem is how quickly you can store the vacuum and how quickly you us it. Connect the tank with the normal 1/4 inch line it really didn't work well. Connect the tank to the manifold through the 1/2 power brake port and the tank would work OK but not great.

I had the 4 gallon mounted on the C60S for a number of years for another purpose, I ran a small line 1/8 to the bottom of the clutch housing to scavenge the oil that leaked from the rear main. You could here this little hiss or slurping sound after you parked the truck which would last for several moments.

The best thing I've found is RainX with the reverse slope windshield it works better than the wipers do.

Cheers Phil

PS Changing to a 261 engine also works plenty vacuum.



Related Thread http://www.mapleleafup.net/forums/showthread.php?t=6896