Barrman
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My M1009 had a speedometer that would be rock steady up to about 45 mph. Then it would jump about 20 mph faster than actual speed and just kind of float around until I slowed below 45 again.
I pulled the cable insert, cleaned it, oiled and no change.
I found another speedometer and installed it. Same basic problem.
I used 3in1 oil on the original near the moving parts on the back and it was better, but hitting bumps could send it back into way far out there land.
I figured it had to be the cable, so I bought a brand new one for a M1009 off Ebay. I don't know what it was supposed to fit, but it was about 8 inches too short to fit my truck. Clean and oil the original before putting it back on made it work ok up to about 55. Then it would jump up again.
The really weird part of all this was that the darn odometer was within 1% of right on matching my gps for distance traveled with both speedometers.
I finally figured the problem would get bad enough and some part would start making noise or just break so I would at least know what to work on. That was last summer. I just used the gps to tell me accurate speeds. That didn't stop me from messing with it though just because I couldn't leave it alone. About November, I thought I had it. Rock steady at all speeds and pretty darn accurate.
Fixed! No problems since November and about 5000 miles driven.
Three weeks ago driving the M1009 to the TX Rally, the needle started bouncing again. Bouncing at all speeds, but around the actual speed going. The next day it was fine in the morning and bounced in the afternoon. 80° at the dash is the work/no work line.
I pulled the cable insert and oiled it up again. No difference. Has to be the speedometer. So, today I brought my spare into class with me and gave it to a student. I also gave him a can of brake cleaner. I told him to lightly spray the gear parts, not the face and to turn it gently while he sprayed. I got busy with other students and didn't look over the kids shoulder. My mistake.
He brought the thing back to me with the face all cloudy white when it was nice and glossy black. The needle now pointed at 30 mph instead of down around where 0 should be. I can see the little return spring right behind the face is all jumbled up now. He had no tools, I have no clue how he screwed it up.
Putting the thing in a drill shows that after cleaning and then oiling with bicycle chain oil, the needle is rock steady. too bad it starts out at 30 mph sitting still.
The point? If your speedometer is bouncing around and not making noise, it is probably dirty, dry and or gummbed up in the gears. Carefully, clean them without getting anything on the face, oil them with a light oil and don't let a teenager do the work.
If you have noise associated with the bouncing, I would look at the cable.
I am going to try cleaning and oiling my last good one myself. If that doesn't work, I am going to break loose from stock and try to find one of the '88 or so versions with the trip odometer. I like trip odometers.
I pulled the cable insert, cleaned it, oiled and no change.
I found another speedometer and installed it. Same basic problem.
I used 3in1 oil on the original near the moving parts on the back and it was better, but hitting bumps could send it back into way far out there land.
I figured it had to be the cable, so I bought a brand new one for a M1009 off Ebay. I don't know what it was supposed to fit, but it was about 8 inches too short to fit my truck. Clean and oil the original before putting it back on made it work ok up to about 55. Then it would jump up again.
The really weird part of all this was that the darn odometer was within 1% of right on matching my gps for distance traveled with both speedometers.
I finally figured the problem would get bad enough and some part would start making noise or just break so I would at least know what to work on. That was last summer. I just used the gps to tell me accurate speeds. That didn't stop me from messing with it though just because I couldn't leave it alone. About November, I thought I had it. Rock steady at all speeds and pretty darn accurate.
Fixed! No problems since November and about 5000 miles driven.
Three weeks ago driving the M1009 to the TX Rally, the needle started bouncing again. Bouncing at all speeds, but around the actual speed going. The next day it was fine in the morning and bounced in the afternoon. 80° at the dash is the work/no work line.
I pulled the cable insert and oiled it up again. No difference. Has to be the speedometer. So, today I brought my spare into class with me and gave it to a student. I also gave him a can of brake cleaner. I told him to lightly spray the gear parts, not the face and to turn it gently while he sprayed. I got busy with other students and didn't look over the kids shoulder. My mistake.
He brought the thing back to me with the face all cloudy white when it was nice and glossy black. The needle now pointed at 30 mph instead of down around where 0 should be. I can see the little return spring right behind the face is all jumbled up now. He had no tools, I have no clue how he screwed it up.
Putting the thing in a drill shows that after cleaning and then oiling with bicycle chain oil, the needle is rock steady. too bad it starts out at 30 mph sitting still.
The point? If your speedometer is bouncing around and not making noise, it is probably dirty, dry and or gummbed up in the gears. Carefully, clean them without getting anything on the face, oil them with a light oil and don't let a teenager do the work.
If you have noise associated with the bouncing, I would look at the cable.
I am going to try cleaning and oiling my last good one myself. If that doesn't work, I am going to break loose from stock and try to find one of the '88 or so versions with the trip odometer. I like trip odometers.
