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Backup of image is here, just in case: https://i.imgur.com/dK4K8sH.jpg?1
These were on my 93 (non-classic) 240. I'm guessing they aren't original, but they have a Volvo part number: 283088-1. Googling that yields nothing.
Wondering if they're worth hanging on to in order to have them rebuilt or something. Does anyone even do that with shocks? Any thoughts or suggestions are welcome.
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If the seats are in good condition the previous owner might have bought his favorite beverage by the pallet load or owned a trailer. You might check for signs the car had a trailer hitch. Inspect the frame rails near the bumper where the large bolts go through from the trunk. Also, any sign of wiring for trailer lights.
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No signs of a trailer hitch, I put one on the car myself when I bought it, had to cut the holes in the rear valence and no witness marks from previous bolts. No idea what was or wasn't being hauled in the car, though, prior to my ownership.
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From Volvo publication, Volvo performance parts and GT accessories catalog, c. 1979.
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I'd found these with the -3 suffix to the part number, rather than the -1 that the ones that came off my car have. What does the part number suffix mean? Mine also look pretty different, with an integrated bellows and that ridged plastic cover over the shock housing. But maybe that's all cosmetic.
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Doesn't make sense to me you'd have a -1 and a -3 on the same part. It isn't a version, I don't think, it is a check digit. At least it was in the RWD era.
https://www.volvoclub.org.uk/faq/PartsSources.html#Volvo_Part_Number_Check_Digit
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Art Benstein near Baltimore
In a world without walls or fences who needs windows or gates.
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My understanding has always been the same, a hyphenated check digit that can be ignored for the purposes of parts lookup. My further understanding is that many times (but not always) when there is a superseded parts number listed that the original part number was used at the various plants for assembly purposes while the later part number was used for the same item in the parts chain. A part that was subsequently sourced under a separate supply contract using the original specifications, also requiring the Volvo name and a Volvo part number to be branded on it, may have been reason enough to use a new part number, even if it ended up being from the same manufacturer.
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Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now
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So by this logic (math?) the check digit for these should be 36, no? Forgive me, I'm a bit of a dolt when it comes to numbers, would you mind explaining why you think this is a check digit?
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My skills are poor and my appetite for puzzles wanes. I get 5 applying the "secret" decoder ring.
283088 -> 2-16-3-0-8-16 -> 45 -> 5
Or on second look (edit)
283088 -> 2-1-6-3-0-8-1-6 -> 27 -> 7
Or if I include a leading 0 for 7-digit p/n and apply 1212121 key:
283088 -> 4-8-6-0-1-6-8 -> 33 -> 3
Lots of examples here to test:
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Art Benstein near Baltimore
Is it true ants never get sick?
I don’t know, but they sure as hell have anty-bodies.
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Volvo part number check digits use what's called the Mod 10 Luhn algorithm developed by IBM in the early days of computing.
So close, Art, in your second example. You missed the final step of taking the resulting total of 27 and subtract it from 30 (the next highest multiple of 10) to get the check digit 3.
For any length of part number, you start from the right (working left) by replacing every odd digit with double of itself then add up every individual digit, followed by subtracting the result from the next highest modulus 10 number greater than or equal.
Eg. 123456 -> 1.2.3.4.5.6 -> 1.4.3.8.5.12 -> 1+4+3+8+5+1+2 -> 24 subtracted from 30 -> 6 -> 123456-6
(this an edited correction of my initial example)
Note that the algorithm is not affected by any leading zeroes before the part number which you may sometimes see in parts tables or on invoices.
This algorithm catches single digit transcription errors as well as most digit pair transposition errors. Modern check digit algorthms used with such things as UPC and bar codes are much more complicated and can catch multiple digit errors and even correct some types of errors.
The Luhn algorithm was popular because it was something that with a little practice humans could do without needing pen and paper. Such decimal digit arithmetic is a minor pain in the ass to program in binary computers, but it was considerably easier in IBM's COBOL programming language used in business/commercial applications that commonly stored numbers internally as decimal characters (rather than binary numbers) and had native string arithmetic (as it is called) so the Luhn algorithm was much easier to implement when passed off to a common library routine. This is giving me pleasant flashbacks to my days as a mainframe systems programmer writing such library routines in machine language to speed processing using the least amount of memory.
https://en.wikipedia.org/wiki/Luhn_algorithm
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Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now
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Will this be on the test?
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'79 242, '84 DL 2 door, '80 DL 2 door, '89 DL Wagon, '15 XC70 T6 AWD
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Laugh, only for extra credit! You may enjoy my reply to Art a few minutes ago under this same subject..
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Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now
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I did enjoy it.
RockAuto can be a crapshoot but sometimes they have some real gems.
And I am glad to finally understand the check digit.
Thanks, Dave.
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'79 242, '84 DL 2 door, '80 DL 2 door, '89 DL Wagon, '15 XC70 T6 AWD
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So the formula in the UK web page works if one can follow directions.
Dave you're pretty sharp for a Volvo owner! :)
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Art Benstein near Baltimore
"And a step backward, after making a wrong turn, is a step in the right direction." -KV
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"pretty sharp for a Volvo owner"
Don't know whether to take that as a compliment or an insult, LOL
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Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now
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"Don't know whether to take that as a compliment or an insult, LOL"
Dave, I intended to compliment your cognitive skills while recognizing some may question mine (and perhaps others in this audience) for devoting so much of life to the care of RWD Volvos from another century.
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Art Benstein near Baltimore
"If you associate enough with older people who enjoy their lives, you will gain the possibility for a full life." -Margaret Mead
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I was about to say that we Volvo enthusiasts rarely if ever need to care about part number check digits when just hours later I came up with a real world example. I was on RockAuto (and others) trying to find a steering rack boot ("bellows" as I soon discovered which is why I was having trouble). A part came up under a slightly different part number than I'd found on the Volvo parts schematics which caused me to pause and wonder if it was a part variant, especially as there are a number of different racks listed for our RWDs (CAM, Koyo, TRW/ZF) with slightly different boots and there was no such mention in this part description. It was on wholesaler clearance (no exchange) at less than half price and one tenth the Volvo list price. I soon guessed it was the check digit and verified it with the Luhn formula just to be sure. I then knew I could safely order it. A boot for just under $7, how can you resist? Beck Arnley, probably no worse than the Pro Parts ones I've used before. Sorry, I bought the last two, even though I only need one at the moment. Just got confirmation, ordered late Saturday, shipped early Sunday morning, will be in my hands by Thursday in western Canada, brokerage, duty, federal and provincial taxes all in for $20 shipping (got some bargain Mann oil filters at the same time for only a few bucks more). Helps make up for my brake caliper rebuild fiasco three days ago when in a rush I forgot to have the pads in for the final pumping of the pedal after pressure bleeding and blew the piston out. Wouldn't go back in easily, ended up damaging the new seal, so had to use a second new seal, which I fortunately had on hand, a previous RockAuto bargain.
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Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now
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They do look a little different but the first six digits are the key here.
I don't know if we have a definitive answer on the hyphenated digit but it has been opined that it's a checksum digit of use only to Volvo.
It's odd, though, that the difference in appearance doesn't rate a new part number. Volvo seems to frequently supersede numbers for parts that evolve while still performing the same function.
Anyway, it seems pretty certain you have a pair of overload shocks.
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'79 242, '84 DL 2 door, '80 DL 2 door, '89 DL Wagon, '15 XC70 T6 AWD
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Logically it would make sense that these are overload shocks, as the PO also put wagon overload springs on the rear of this car, even though it's a sedan. It didn't make sense to me either, but until I encounter a good deal on a set of IPD lowering springs (or similar), they'll do the job.
Still, this is mostly about curiosity for me.
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