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Speedos,Sprockets,Pinions,and Gears(1800s)thankyou very much!!![ALL/1998] posted by George Pluck on
Monday, 14 July 1997, at 10:05 p.m.
Where do I start on this one?
When I got my '67 1800s the speedo was not working. After some investigation I ruled out the speedo cable. A shame really, because that would of been easy.
I crawled under and ruled out that crazy right angle gear. Further into it however I found the culprit. The shaft on the drive pinion was sheard.(things like that just don't happen)On the phone with my local Volvo dealer I found out that there are two possible pinions for a '67, and that I would have to count the cogs to find out which one I needed. I counted 20, the dealer said "Are you sure?" I laughed and counted 20 again. The dealer said "That can not be, has a later model tranny been fit into your car?"
This is where I am now. I know that I have to crawl under there and locate a serial number, but I just wanted to know if that 20 cog pinion could be the wrong pinion in the right tranny, and that is why it broke.
Thankyou for this site. I know there are good people out there.
Re: Speedos,Sprockets,Pinions,and Gears(1800s)thankyou very much!!![ALL/1998] posted by Glenn R. Goodspeed on
Sunday, 20 July 1997, at 8:49 p.m.
Could be the wrong pinion, but that's probably not why it broke. Various pinions from different M40 and M41 transmissions used in Volvos throughout the sixties and into the seventies are interchangeable. The number of teeth in the gear determines the speed your speedometer displays. Someone might have exchanged it, for instance, to counteract the effect of putting different wheels on the car.
There are only a few ways to break one of these, and they all involve jamming some part of the linkage from the gear on back to the speedometer. Before you reconnect the speedometer cable, make sure it turns freely in BOTH directions. My P1800 kept breaking speedometer cables, and I finally discovered that a spring was missing inside the speedometer. Its function? It holds a pawl on a gear that disconnects the odometer when the car is reversing. Without the spring in place, the pawl jammed the speedometer whenever I backed the car up. I guess my pinion shaft was tougher than the cable, because I broke two cables before I finally figured out how to fix the problem. -Glenn.
P.S. Check out my P1800 web page:
http://www.startext.net/homes/ggoodspe/INDEX.HTM
Goodspeed's Volvo 1800 Newsletter