Wiper Parking Side Notes (or, Right is Right, for LHD, and Left is Left, for RHD!)
5-2021R. Kwas [Comments added!]
I had a Volvo-owner contact me with a question of an unusual Wiper situation...after a rebuild, with complete disassembly/reassembly/reinstallation of his 1800 Wipers, he found them parking on the "wrong" side. He was stumped, wondering if this was perhaps an electrical issue with the Parkswitch...
Thinking about this immediately reminded me of when yet another acquaintance ran across this same situation a number of years ago. At that time, and after an inspection of the linkages, the explanation and remedy became clear!
These notes are intended to help other individuals, and prevent such a seemingly mysterious condition. Note that the Wiper Mechanism shown is a Segment Gear type as typically installed in the 122s, because that's what I had handy, however the info and operating principle, and solution to the issue, applies equally, of course, to the Cable-on-Cam Systems typical on 1800s.
Angular Position of the Bellcrank/Conrod
Wiper Assembly Removal from an 1800S (with Dashboard in-place!).
Link to separate page: Windshield Wiper Systems
Wiper (and linkages) at Right, OR Park Option 1 (for LHD vehicles):
Pivot point of Long Linkage Arm is held to the Right (R) of axis of Driveshaft coming out of the Drive/Parkswitch Assy, shown here, disconnected from the shorty Bellcrank/Conrod (which is mostly hidden and actually to the Left, highlighted in dotted lines).
This puts Wiper Park Position (of the taped-on Wiper stand-in) to the Right.
Wiper Park Position Right (as seen here, as if viewed from in front of vehicle), for LHD vehicles.
Wiper (and Linkages) at Midtravel:
With pivot point of Long Linkage Arm at axis (C) of shorty Bellcrank/Con-rod.
Wiper at Maximum Left position during Wipe. OR: Park Option 2 (Left, for RHD vehicles):
Pivot point of Long Linkage Arm can be seen at left (L) of drive-axis of shorty Bellcrank/Conrod, putting the Wiper Park Position to the Left.
Wiper Park Position Left, for RHD vehicles.
Angular Position of the Bellcrank/Conrod at Park Position:
Detail of the Driveshaft out of Parkswitch Assy. It is splined on this Amazon Wiper Assy, so changing the parking side would likely necessitate a puller. I also found the securing nut to be bigger than 3/8" but smaller than 7/16"...yep!...it's 10mm (not that much of a surprise, since this is an SWF (German) supplied assembly)! The connection is a double "D" shaped shaft on the 1800, where switching sides is a simple matter. If the reader knows the possible significance of the "3175" prominently punched into the Bellcrank/Conrod, I invite them to get in touch and let me know!
Update 7/2021: In thinking about the "3175" some more, remembering the approximate length of the Bellcrank/Conrod, and looking more closely at the punched-in numbers, one can just make out a decimal separating the 31 and 75! ...AHA!!...he said!
The number is the pivot-to-pivot length of the Rod in mm (which would be a critical dimension!), and measuring confirms this! I guess SWF supplied differently configured assemblies, and adding the length on the part itself allowed assembly which could quickly be confirmed with a visual inspection. I am somewhat impressed that the nominal length is specified not to tenths of a mm, but hundredths!!
Combining this newly learned information with the information above, we can see that the 31.75 is also equal to the "R" and "L" dimensions, so that the total stroke at the rotating pivot, and input to the Wiper side-to-side linkage would be twice that, or 63.50mm.
Measuring Bellcrank/Conrod on SWF Wipermotor Assy.
...so the general tip when disassembling an assembly, is to first recognize that it might go back together multiple ways (a double "D" or splined connection would certainly fall into this category!), but only one "correct way", is to either make witness marks (with a punch or permanent marker), or take pictures during disassembly...either will help, come reassembly time! In this case, without such help, there was a 50/50 chance of getting it right/"wrong", but at least there was no chance of damage when it was wrong...sometimes, when there is a risk of damage...manufacturers employ Poka-Yoke (error-proofing).
Excerpt from my correspondence with John F. asking about his "Wipers parking on wrong side"
"I have ... figured out what the issue is...plus I went to
the bench, where I happen to have a 122 Wiper Assy, and did some tests to prove
out what I came up with theoretically. ...the simple
answer is that you have your Wiper Linkage Assy configured for a RHD vehicle!!
You inadvertently have the (short) Bellcrank/Conrod, which is attached to the
Driveshaft coming out of the Parkswitch Assy, attached in the wrong direction
allowed by the "double D" shape! Removing the nut which secures it, although
not so much fun, and requiring some contortions, under the 1800 Dashboard, CAN
be corrected without removal of the entire Wiper Assy.
To correct your current situation, the Securing Clip which attaches the Long
Linkage Arm which goes out to one side to drive the Wipers, must first be
removed to gain access to the Securing Nut, which must be removed, this will
allow the shorty Bellcrank/Conrod to be pulled off the Driveshaft, and replaced
180Deg from the previous position. Replace and retorque the Nut (a Nylock
(might be a good improvement here to prevent self-loosening!), and once secured,
reattach the Long Linkage Arm and Securing Clip. This "reconfiguring to LHD"
will result in the Wiper now Parking on the other side. You might want to
check, and finetune the exact Parking position, but I think you get the
principle of the thing... "
He did need to remove the Wiper Assy from the car to get access to the linkage tin order to make the correction, which is no fun, but reported this was possible with Dashboard in place (and without removing the Dashtop, which is a bit of a surprise), by removing some gauge wiring and connections. I asked him to make a detailed list of what needed to be removed in order to allow access, which I have added here.
See : Reference Information
The mechanical issue thus resolved, he then reinstalled the Wiper Assy, into the car, but upon testing it, the Motor (an Electrolux) was now completely without life...electrical checks showed there was Voltage on all the wires, but the motor would not turn...[so this points to one likely condition...no current flow!] ...after a couple of e-mail back-and-forths, this issue was easily resolved as a missed chassis return wire on the rubber/electrically isolated motor... Simple!
Reminder and Tip: Since the Wiper Motors are Rubber isolated mounted, to minimize motor and gearbox noise transmission into the Dashboard, they must also have a conductive link in the form of a short hop-over wire, from the assembly to the motor case to provide the return current path to chassis. Don't forget to replace this wire when working on the assembly to spare yourself another not-so-fun-process of having to remove the Wiper Assembly from the Dashboard again!
Windshield Wiper Systems
Wiper Assembly Removal from an 1800S (with Dashboard in-place!). [Procedure for removal of Wiper Assembly from an 1800S which can be done with Dashboard in-place. Authored by Guest Contributor John Finn.]
This article is Copyright © 2021. Ronald Kwas. The terms Volvo and SWF, and Electrolux are used for reference only. I have no affiliation with any of these companies other than to try to keep their products working for me, help other enthusiasts do the same, and also present my highly opinionated results of the use of their products here (like giving Lucas all the grief they so richly deserve!). The information presented comes from my own experience and carefully considered opinion, and can be used (or not!), or ridiculed and laughed at, or worshipped, at the readers discretion. As with any recipe, your results may vary, and you are, and will always be, in charge of your own knuckles and future!
You are welcome to use the information here in good health, and for your own non-commercial purposes, but if you reprint or otherwise republish this article, you must give credit to the author or link back to the SwEm site as the source. If you donít, youíre just a lazy, scum sucking plagiarist, and the Boston Globe wants you! As always, if you can supply corrections, or additional objective information or experience, I will always consider it, and consider working it into the next revision of this article...along with likely the odd metaphor and probably wise-a** comment.