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Speedo is reading incorrect speed

Tiny
TREV01
  • MEMBER
  • 1986 NISSAN NAVARA
  • 250 MILES
Speedo is reading incorrect speed. When doing approx 60klm/h it shows 40. Speedo will occasionally also read 160klm/h when only doing about 10. Have tried a couple of things that have been suggested and nothing has worked. Tried to get 2nd hand cluster from wreckers but not having much luck. Any suggestions appreciated.
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Saturday, November 3rd, 2012 AT 1:04 AM

3 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Did you change the size of the tires and wheels?

Roy
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Saturday, November 3rd, 2012 AT 1:07 AM
Tiny
TREV01
  • MEMBER
  • 2 POSTS
It has 10r15's on it which I think is slightly bigger than standard but I have been told it shouldn't make a lot of difference. Certainly the 160k/h when doing 10 it wouldn't have anything to do with that.
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Saturday, November 3rd, 2012 AT 1:13 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
The speedometer is faulty and has to be replaced. One thing you can try is remove the meter and check if transmission oil has crept up from the cable. Oil contamination can result in the symptoms described as it would not allow the plate behind the meter gear to freewheel and allow the magnet to perform its work correctly.

If there are oil contaminations, you can try cleaning with carb cleaner but be careful in order not to dirty the meter face.
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Saturday, November 3rd, 2012 AT 11:31 PM

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