Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG. This site is not affiliated with Porsche in any way.
Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners.
 

Welcome Guest ( Log In | Register )

> speedometer won't turn, 2 broken speedo cables later...
bradtho
post May 16 2010, 09:35 PM
Post #1


Member
**

Group: Members
Posts: 266
Joined: 22-December 09
From: Seattle, WA
Member No.: 11,165
Region Association: None
Using a drill I figured out that the speedo cable was broken, so I bought another and broke it testing it with my drill. I cut one of the tips off and pulled the speedometer completely out. Using the tip and a vise grip, I am unable to turn the speedo at all. I followed the instructions on PP to disassemble the speedo and can actually spin the magnet wheel, but it will not spin the square drive for the cable when the magnet spins.

btw: the needle moves quite freely, and the speed unit is completely disconnected from the odo so it can't be the odometer gears. Reading other threads it sounds like taking this apart any further isn't advised. Anyone had this problem before or have a suggestion besides sending it somewhere for repair?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
 
 Reply to this topicStart new topic
Replies(1 - 9)
McMark
post May 17 2010, 12:33 PM
Post #2


914 Freak!
***************

Group: Retired Admin
Posts: 20,179
Joined: 13-March 03
From: Grand Rapids, MI
Member No.: 419
Region Association: None
Buy a different one. They're not expensive. One of the guys up in your area probably has one.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
SirAndy
post May 17 2010, 01:08 PM
Post #3


Resident German
*************************

Group: Admin
Posts: 41,641
Joined: 21-January 03
From: Oakland, Kalifornia
Member No.: 179
Region Association: Northern California
QUOTE(McMark @ May 17 2010, 11:33 AM) *

Buy a different one. They're not expensive. One of the guys up in your area probably has one.

(IMG:style_emoticons/default/agree.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
messix
post May 17 2010, 01:19 PM
Post #4


AKA "CLUTCH KILLER"!
*****

Group: Members
Posts: 6,995
Joined: 14-April 05
From: between shit kickers and pinky lifters/ puget sound wa.north of Seattle south of Canada
Member No.: 3,931
Region Association: Pacific Northwest
look in the classifieds, rich has a parts posting for $9.14 parts. rdauenhauer http://www.914world.com/bbs2/index.php?sho...88677&st=20
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
markb
post May 17 2010, 01:19 PM
Post #5


914less :(
*****

Group: Members
Posts: 5,449
Joined: 22-January 03
From: Nipomo, CA
Member No.: 180
Region Association: Central California
I'd sell you a used (untested) one for $25.00 shipped.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Bartlett 914
post May 17 2010, 01:29 PM
Post #6


Advanced Member
****

Group: Members
Posts: 2,216
Joined: 30-August 05
From: South Elgin IL
Member No.: 4,707
Region Association: Upper MidWest
QUOTE(bradtho @ May 16 2010, 10:35 PM) *

Using a drill I figured out that the speedo cable was broken, so I bought another and broke it testing it with my drill. I cut one of the tips off and pulled the speedometer completely out. Using the tip and a vise grip, I am unable to turn the speedo at all. I followed the instructions on PP to disassemble the speedo and can actually spin the magnet wheel, but it will not spin the square drive for the cable when the magnet spins.

btw: the needle moves quite freely, and the speed unit is completely disconnected from the odo so it can't be the odometer gears. Reading other threads it sounds like taking this apart any further isn't advised. Anyone had this problem before or have a suggestion besides sending it somewhere for repair?

I went through several speedo cables before I realized the problem was the trip odometer. It would reach 99 miles and when turning 100 the cable would break.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
charliew
post May 17 2010, 07:39 PM
Post #7


Advanced Member
****

Group: Members
Posts: 2,363
Joined: 31-July 07
From: Crawford, TX.
Member No.: 7,958
It's not rocket science. Put the cable or a small screwdriver in the square hole and try to turn it. There is no mechanical between the magnet and the cup wheel that the needles is connected to. The needle moves from a magnetic field.Look inbetween the gears for a obstruction that might keep them from turning. try a little 3 in one oil on the shafts. The input goes directly to the magnet if I remember from about 10 years ago with the screw gear turning the number wheels through a gear on the end of the shaft. All mechanical speedos are the same. The 99 rollover is a little tang that comes around and turns the 1000 0 to a one just like all the other 0's. Get another one and then you can take this one apart and be educated. Usually it's worn bushings and the magnet and wheel that rubs. Or the plastic gears loose their mesh. If they get too far apart the tips of the gear teeth bind. I once had a cable that was too long and bound up the speedo. Thats pretty easy as unscrewing the cable housing nut a little will show it to get hard to tighten as it gets fully seated.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
bradtho
post May 17 2010, 08:25 PM
Post #8


Member
**

Group: Members
Posts: 266
Joined: 22-December 09
From: Seattle, WA
Member No.: 11,165
Region Association: None
QUOTE(charliew @ May 17 2010, 06:39 PM) *

It's not rocket science. Put the cable or a small screwdriver in the square hole and try to turn it. There is no mechanical between the magnet and the cup wheel that the needles is connected to.


that's just it, I've completely disconnected the speed unit from all the odometer gears. the square hole will not spin. I can spin the magnet (not easily) but I assume that's just the magnet spinning around the stuck shaft that the square drive spins.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
underthetire
post May 17 2010, 08:30 PM
Post #9


914 Guru
*****

Group: Members
Posts: 5,062
Joined: 7-October 08
From: Brentwood
Member No.: 9,623
Region Association: Northern California
A 25.00 speedo is a lot cheaper than two 38.00 cables. Why fight it. (IMG:style_emoticons/default/confused24.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
charliew
post May 18 2010, 12:57 PM
Post #10


Advanced Member
****

Group: Members
Posts: 2,363
Joined: 31-July 07
From: Crawford, TX.
Member No.: 7,958
If you have broken the grip of the magnet to the shaft you might as well go get another one and just play with the one you have. The shaft may have siezed in the bushing but I haven't ever seen that and most of my toys are at least as old as a 914 but they also aren't as open to the elements.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
« Next Oldest · 914World Garage · Next Newest »
 

Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 

Display Mode: Switch to: Standard · Linear+ · Switch to: Outline

Track this topic · Email this topic · Print this topic · Subscribe to this forum

- Lo-Fi Version Time is now: 18th May 2024 - 06:45 AM
Invision Power Board v9.1.4 © 2024  IPS, Inc.
All rights reserved 914World.com © since 2002
914World.com is the fastest growing online 914 community!
We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ...