Speedometer Cluster Disassembly Question (1 Viewer)

Joined
Apr 7, 2003
Messages
637
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Mission Viejo, Ca
The speedometer on my '82 FJ40 started acting very erratic, jumping up to 80+ mph while only going about 40. It is not the plastic gear in the transfer case or cable. I moved the cluster to my '80 FJ40 and it did the same thing. I took it apart and everything looks and seems to work as it should but the part where the cable goes in feels a little gummed up when spinning it. I thought that I would just clean all gears, re-grease, and put it back together to see if that will solve the problem. However, I can't figure out how to remove the gear with the "bell" from the housing. Anyone know how to remove that piece? Also, any ideas on what the problem with the high indicated speeds would be? Thanks!

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TheHardWay

Ain't as easy as it looks
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Joined
Dec 29, 2013
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1,491
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Las Cruces, NM
That's about where I stopped with mine:
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After taking the pic, I removed the odometer. I had the same experience with the bouncing needle, and fixed it by pulling the speedo cable from the sheath, inspecting for kinks, cleaning the dried out lubricant, regreasing and reinstalling the cable. No problem now!
 
Joined
Apr 7, 2003
Messages
637
Location
Mission Viejo, Ca
I have a brand new oem cable so I can rule that out. It still bounced like crazy when I moved it over to my other 40 so I think the problem is somewhere in the cluster. The gears behind the “bell” look okay from what I can see. I am hoping it is something simple like gummed up gears...
 
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Joined
Jul 8, 2013
Messages
132
Location
Utah
Yikes! I have have been researching as well and it seems the magnetic cup is not serviceable. I took my 40 for a spin 2 days ago, the noise was unbearable and then AHH silence. UH OH! The needle is dangling straight down. :confused: Luck would have it, I found and scooped up a '77 instrument cluster today, my 40 is a '69. Now I must decide wether to attempt swapping in just the speedo assembly or the whole cluster. ? Step 1 will be snagging a clip style speedo cable. If anyone has done this in either way (total swap or just speedo) please feel free to post your library of links below.
I'll start Clusters, Gauges, Speedo & Odo meters - https://forum.ih8mud.com/threads/clusters-gauges-speedo-odo-meters.544543/

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Joined
Apr 7, 2003
Messages
637
Location
Mission Viejo, Ca
Just following up... I cleaned the gears behind the magnetic cup using electronics cleaner blasted in while spinning with a drill. A lot of dark crap came out with the fluid. I then greased the gears while spinning slowly with the drill to get the grease sucked back into the housing. The magnetic cup spun way easier after this. I cleaned and greased the remaining gears and put it all back together. During my test drive the speedometer worked perfectly until I first got over 65 mph and it then jumped to 85. After that initial jump it continued to work perfectly for the remainder of the drive so hopefully it will work for awhile before I have to deal with it again. After looking over everything and thinking about it some more I suspect the problem is likely with the speedometer spring and not the magnetic cup/gears. Maybe the spring is getting worn out after 366K miles?
 
Joined
Feb 25, 2011
Messages
108
Location
Sisters, Oregon
About 5 years ago my odometer quit working and I was able to remove all the odometer wheels changed the order of them, lubed them and reassemble . The speedometer must be lubed. I used singer sewing machine oil. Most bouncing speedometer needles can be attributed to lack of lube in the speedometer cable.
 

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