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2001-10-10 by Don Lattimer
Hi, My speedo reads 70mph when actually I'm doing 62 mph. Checked by my GPS. What needs to be changed? I suppose I need to figure out what the rear axle ratio is first. How can I do that physically? There must be a way to measure the tire circumference, etc. Any suggestions?? Don Lattimer #3M5759 V6 Willits, CA
2001-10-10 by Jeff Caraway
Hi Don, It sounds like it needs to be recalibrated. Here is a contact Hayes Harris provided me for a company in NY that rebuilds and services Smiths gauges. They could probably answer some of your questions. Nisonger 570 Mamaroneck Ave. Mamaroneck, NY 10543 @ 914-381-1952 Hope that helps, Jeff
-----Original Message----- From: Don Lattimer [mailto:donlattimer@...] Sent: Wednesday, October 10, 2001 11:07 AM To: MarcosManiacs@yahoogroups.com Subject: [MarcosManiacs] Speedometer error Hi, My speedo reads 70mph when actually I'm doing 62 mph. Checked by my GPS. What needs to be changed? I suppose I need to figure out what the rear axle ratio is first. How can I do that physically? There must be a way to measure the tire circumference, etc. Any suggestions?? Don Lattimer #3M5759 V6 Willits, CA Yahoo! Groups Sponsor ADVERTISEMENT <http://rd.yahoo.com/M=168643.1620686.3205344.1261774/D=egroupweb/S=1707 490552:HM/A=816901/R=5/*http:/www.overstock.com/cgi-bin/d2.cgi?cid=12973 > <http://rd.yahoo.com/M=168643.1620686.3205344.1261774/D=egroupweb/S=1707 490552:HM/A=816901/R=6/*http:/www.overstock.com/cgi-bin/d2.cgi?cid=12973 > <http://us.a1.yimg.com/us.yimg.com/a/1-/flash/overstock_com/osyahooalt.j pg> <http://us.adserver.yahoo.com/l?M=168643.1620686.3205344.1261774/D=egrou pmail/S=1707490552:HM/A=816901/rand=294581122> To unsubscribe from this group, send an email to: MarcosManiacs-unsubscribe@yahoogroups.com Your use of Yahoo! Groups is subject to the Yahoo! <http://docs.yahoo.com/info/terms/> Terms of Service.
2001-10-10 by Mike Denman
--- In MarcosManiacs@y..., "Don Lattimer" <donlattimer@p...> wrote: Hi Don, Normally you would change the speedometer drive gear in the transmission first. Most transmissions have a variety of speedometer drive gears to match the various rear end ratios that are used in the various cars that use that particular transmission. My Marcos, for example, has 4 different speedometer drive gears for the Volvo Transmission. With these 4 gears I can find one that is close for the 3.9, 3.77 and 3.55 rear end ratios that are used in the Cortina rear ends. I'm sure that your transmission is the same although it may be harder to get the parts. Mike Denman 1966 Marcos 1800 Chassis # 4079
> > My speedo reads 70mph when actually I'm doing 62 mph. Checked by my > GPS. What needs to be changed? I suppose I need to figure out what > the rear axle ratio is first. How can I do that physically? There > must be a way to measure the tire circumference, etc. Any > suggestions?? > > Don Lattimer > #3M5759 V6 > Willits, CA