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  #1  
Old July 31st, 2018, 20:53
sartor sartor is offline
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speedo gear sleeve and gear torn up

Hi all -



Any ideas as to what could cause this?


Highway driving and speedo/odo quit and threw the P0500 code. Had a guy pull the SYE tail housing off and he found that the speedo gear and the gear sleeve were both chewed up all the way around.



No other symptoms.


Put a new gear in and turned the sleeve around (because only 1/2 of the sleeve's gears were chewed up. Speedo worked for about 20 miles then quit again. I'll be we find another chewed up gear/sleeve.






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Old August 1st, 2018, 03:59
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Re: speedo gear sleeve and gear torn up

What kinda vehicle ? A P0500 hints at OBD-II ?

Is the speedo sensor correctly indexed ?

Select the appropriate tooth gear range you just installed and rotate it until it is aligned with the raised dot on the transfer case as shown in the pic.

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  #3  
Old August 1st, 2018, 07:13
sartor sartor is offline
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Re: speedo gear sleeve and gear torn up

Forgot.

1998 XJ 4wd 4.0
4.56/32”

Also if note, that speedo gear probably had 20,000 miles on it.

Is it possible for a VSS to fail in a manner that would prevent the speedo gear from spinning, and would then rip up the teeth on the sleeve?
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Old August 1st, 2018, 18:33
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Re: speedo gear sleeve and gear torn up

looks & sounds like the sensor side of things locked up..........or if it had a cable, I'd say it seized.


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Old August 1st, 2018, 18:40
sartor sartor is offline
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Re: speedo gear sleeve and gear torn up

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having trouble with the first image. Let's see if this works...




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  #6  
Old August 1st, 2018, 18:41
sartor sartor is offline
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Re: speedo gear sleeve and gear torn up

Quote:
Originally Posted by Tim_MN View Post
What kinda vehicle ? A P0500 hints at OBD-II ?

Is the speedo sensor correctly indexed ?

Select the appropriate tooth gear range you just installed and rotate it until it is aligned with the raised dot on the transfer case as shown in the pic.

.
It was. It worked for a good 20k.
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  #7  
Old August 1st, 2018, 18:42
sartor sartor is offline
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Re: speedo gear sleeve and gear torn up

Quote:
Originally Posted by TRCM View Post
looks & sounds like the sensor side of things locked up..........or if it had a cable, I'd say it seized.


.

That's what I was thinking. Wondering if it is even a possibility. A friend said that sometimes there may be a T-case shaft misalignment and it's putting pressure on the speedo gear and sleeve causing it to get chewed up. However, I have zero other symptoms.



Curious.
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  #8  
Old August 2nd, 2018, 08:03
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Re: speedo gear sleeve and gear torn up

The gears have a lash adjustment by rotating the housing to compensate for gears with different numbers of teeth. Sounds like someone either got it way too loose or way to tight.
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Old August 2nd, 2018, 15:52
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Re: speedo gear sleeve and gear torn up

Quote:
Originally Posted by old_man View Post
The gears have a lash adjustment by rotating the housing to compensate for gears with different numbers of teeth. Sounds like someone either got it way too loose or way to tight.
Interesting. I did not know that. I changed gears 3 times by pulling the gear and the little shaft out, pushing the new gear and attached shaft in, re-inserting everything back into the transfer case housing and bolting it in its original position,... the two groves cut into the base plate. Because of its design I take it for granted it would not fit any other way.
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