Stovebolt.com Forums The Shop Area General Truck Talk 49 Wiper - park position of the linkage on the wiper motor

All

What is the park position of the linkage on the wiper motor

Mine is level with the joint on home motor but in this position one wiper too low one too high

Can you take blades off and re-install them in the correct position?

Jack,

The information in this 1947-48 Truck Cab booklet [chevy.oldcarmanualproject.com] in the last section on windshield wiper checks and adjustments should be helpful in figuring out your situation.

From what you described, sounds like you will need to reposition your wiper arms to get everything back in line. Section 1 in the 1948-51 Shop Manual describes the how to part of wiper arm removal and installation.

Let us know if this is helpful please.

Dan

Many thanks!

Might be able to reposition on spline

Problem is it’s almost like linkage is too long

Right wiper short linkage at 3:00 position and still won’t get to spindle on motor

About 1/4” too long

I’ll fiddle some more

You could check were the wiper motor mounts and see if it moved from the rubber mounts worn .

Thank you

The vacuum motor mounts screws can be loosened to allow the motor to twist slightly to align the wipers if moving them on the splines (where the wiper arms mount to) doesn’t help. This would move one arm up and the other down.

Jack,

Would suggest you start by removing the wiper arms from the splines on the outside of the cab. (See the 2 screenshot pictures attached below for reference in the next steps.)

With that done, manually move the wiper motor arm to the 12 - 6 O'clock alignment position (arms disconnected from motor).

Next, position the L and R wiper arms so the short arm on each splined drive shaft on both sides is positioned at 6 O'clock (actuating arms still disconnected).

Once these 2 steps are done, your "short" actuating arm for drivers side should reach the lower pivot point on the motor arm and the "long" actuating arm for the passenger side should reach the upper pivot point on the motor arm.

If they do, attach the two activating arms and reinstall your wipers to the splined shafts in the 12 O'clock position and things should all connect and your alignment process should be successful.

If the activating arms don't reach from the motor pivots to the splined drive tabs, there is either damage to one or more of them or you possible have some incorrect parts involved.

Check back and let us know if this is helpful and you figured it out (or not) please.

Dan

Dan

Will do

With the motor in park what orientation is the arm on the motor

Mine is horizontal but pics I’ve found usually have 30 deg off horizontal

Issue right now is it won’t pull wipers all the way over to end of stroke without help

If I shut wiper off it’ll pull them back

Vacuum 21”

Jim Carter rebuild but it doesn’t look like motor was ever apart just freed up

I’ll mess with it some more

Thanks all

When I went to an electric motor, the arms and blades flopped around. I studied the situation under the dash and after a while, concluded the one arm was too short. I got brave (or was it stupidity) and cut the arm and put in an adjustable piece with slotted holes.

It worked but I still wouldn't advise anyone to do this. Note I could still adjust the arm to the previous total length.