08-11-2020, 07:51 AM | #1 |
Registered User
Join Date: Oct 2003
Location: Palm Bay, Florida
Posts: 75
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Weak Wipers
Does anyone know what would cause weak wipers? They will only wipe if the windshield is wet...and even then seems weak. The motor (new rebuilt), switch and wiring is all new. 12V to the motor and grounds have been triple checked. Towers are lubed. We are dumbfounded. So close to having her on the road its driving me crazy.
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08-11-2020, 08:20 AM | #2 |
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Join Date: Aug 2019
Location: Cheraw
Posts: 1,300
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Re: Weak Wipers
Tension of the blades to the windshield and the type of blade itself.
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08-11-2020, 09:53 AM | #3 |
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Join Date: Oct 2003
Location: Palm Bay, Florida
Posts: 75
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Re: Weak Wipers
Big Bird, thank you. Is this something you've experienced? How does it change? it seems the spring would get weaker over time not stronger but I'm at a complete loss. Do you know if there is a spec on setting and adjusting the tension? I don't see anything in the assembly manual. Thanks again.
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08-11-2020, 10:13 AM | #4 |
The Older Generation
Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,606
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Re: Weak Wipers
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You will need to take the wiper linkages off of the motor arm and try and move them manually. The transmissions may be dragging. While the linkage is off turn the wiper motor on and see how it does. You can also test the wiper motor out of the truck. I know you mentioned that the towers are lubed but they could still be dragging. http://67-72chevytrucks.com/vboard/s...d.php?t=413551 Scroll down to "2-speed wiper motors - This is the '67-'72 wiper motor" LockDoc
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Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
08-11-2020, 11:02 AM | #5 |
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Location: Palm Bay, Florida
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Re: Weak Wipers
Loc Doc, thank you. The motor was checked and operates without linkage connected and does operate if connected but only when windshield is wet. I'll note that i do only get one speed with the two speed motor so somethings not right there. The transmission arms seem ok but I ordered new ones anyways. Unfortunately they cam in with a factory assembly defect and binding issue, so working on getting replacements.
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08-11-2020, 12:25 PM | #6 |
Post Whore
Join Date: Feb 2016
Location: Portland Oregon
Posts: 11,246
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Re: Weak Wipers
How about the seal through the firewall? And how smooth is the shaft where it contacts the seal? Both of these were adding friction on my Burban's wipers.
But that my not be the issue if you have an electrical problem. And remember our trucks only had 2 speeds slow and sloooower! I'm so used to the speed of our wipers if I drive a new vehicle in the rain, todays scary fast wipers freak me out!
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377 |
08-11-2020, 12:35 PM | #7 |
Registered User
Join Date: Oct 2003
Location: Palm Bay, Florida
Posts: 75
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Re: Weak Wipers
Thanks HO and everyone else. I'll run though all the suggestions one more time this weekend to see if I can't figure this out. I'll let you know what I find.
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08-15-2020, 06:47 PM | #8 |
Workin to live...
Join Date: Jun 2003
Location: Texas Hill Country
Posts: 261
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Re: Weak Wipers
Doesn’t solve the weak wiper problem, but for driving in the rain, rain X is your best bet!
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Jason |
08-16-2020, 08:49 AM | #9 |
Registered User
Join Date: Oct 2003
Location: Palm Bay, Florida
Posts: 75
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Re: Weak Wipers
I decided to try a motor from Newport Engineering. Should be in next week. The other motor was checked for the 4th time and still no clue. Found I do have two speeds after all. It’s just hard to notice without blades on because there not much difference.
Thanks for the tip! I usually use rain X on all my vehicles. It does make for a clean, clear, windshield. |
08-16-2020, 03:29 PM | #10 |
Senior Member
Join Date: Jan 2013
Location: North Charleston SC
Posts: 504
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Re: Weak Wipers
I just installed a NEWPORT wiper motor in mine and without the arms and blades on it's way better than the old motor I took off of it. I also got the upgraded switch with the delay with it.
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08-17-2020, 12:07 AM | #11 |
Registered User
Join Date: May 2011
Location: Reno Nevada
Posts: 382
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Re: Weak Wipers
I would bet that your motor is tired. Replace it with a new one .
Vic |
08-17-2020, 07:19 AM | #12 |
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Join Date: Jun 2016
Location: West Palm Beach, Florida
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Re: Weak Wipers
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08-17-2020, 08:38 AM | #13 |
Senior Member
Join Date: Jan 2013
Location: North Charleston SC
Posts: 504
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Re: Weak Wipers
Minkota,
I ordered it thru newportwipers.com |
08-17-2020, 11:54 AM | #14 |
Post Whore
Join Date: Feb 2016
Location: Portland Oregon
Posts: 11,246
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Re: Weak Wipers
I looked at the Newport wiper system for my 52 but man they are pricey and I've never found anyone who has installed them in a daily driver. Especially a daily driver in the PNW. Hard for me to pry that much cash out without some assurance that they will last for decades.
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377 |
08-17-2020, 05:18 PM | #15 |
Registered User
Join Date: Oct 2003
Location: Palm Bay, Florida
Posts: 75
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Re: Weak Wipers
Sixty9 - Yeah, I didn't get the intermittent option for fear the box wouldn't fit behind the dash. How did your's fit?
Vic- motor was a new rebuilt so not sure what the problem is/was. HO - yes, it was not cheap but I was out of options, other than trying another rebuilt, and they came highly recommended so hopefully 1) it works...and 2) it lasts. I thought I read another board member installed one years ago with good success. This is literally the last thing to get running before she's road worthy. I've got a small fortune in her anyways so thought what the hell. It's been 17 years in the making (don't ask) and I'm so close. |
08-17-2020, 05:33 PM | #16 |
Senior Member
Join Date: Jan 2013
Location: North Charleston SC
Posts: 504
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Re: Weak Wipers
It looks like I will have room for it. I am not using the standard gauges.
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08-17-2020, 06:27 PM | #17 | |
Post Whore
Join Date: Feb 2016
Location: Portland Oregon
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Re: Weak Wipers
Quote:
17 years? You're just getting started!
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377 |
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