GU Speedo's
Submitted: Thursday, Jun 01, 2006 at 13:10
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This Thread has been Archived
Snowy 3.0iTD
G'day All
I am looking to get a engineering certificate to make the 33in tyres on my patrol totally kosher with the regs and insurance companies. Before you all say not this again, I have read a lot of the archived posts and have two specific questions:
Firstly does anyone know exactly what the allowable speedo error specified in the ADR design rules is?
Secondly I have read about changing the speedo cog(s) at the gear box end, how difficult is this, is just undo a few screws/bolts, take the old one out put the new one in, or is there a lot more to it?
Thanks in Advance
Snowy
Reply By: Robin - Thursday, Jun 01, 2006 at 14:45
Thursday, Jun 01, 2006 at 14:45
0% under indication and -6% over Snowy, got Nissan to swap out a new speedo on that one for my GQ before I realized the electroinc speedo had a cal knob on the back.
You probably need to do nothing as GU speedo reads over (faster) about 6% by design.
My 33's almost spot 100 reading=99 actual and 60reading =61 (note speedo is non-linear)
Jaycar convertor kit is lowest cost option - if you don't mind building things
Robin Miller
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176135
Reply By: bobsa - Thursday, Jun 01, 2006 at 16:06
Thursday, Jun 01, 2006 at 16:06
Hi Snowy,
I had the same problem with my 3.0L GU 4
There is no adjustment on the back of the speedo.
The driven gear is very easy to change. Find the sensor on the back of the gear box on the extension housing, there is a 10mm bolt remove that and pull it out a small amout of oil will be lost, I just plugged it with a piece of rag.
There is a small circlip remove this and the cog can be removed and changed to suit your needs.
Here is a list of part numbers for the cogs
32743-74P18..........18 tooth
32743-VB017..........17 tooth
32743-VB016..........16 tooth
32743-VB015..........15 tooth
the original cog in the GU 4 with 17" standard rims is a 16 tooth, went to 285 75 16 and changed to a 15 tooth cog and the speedo now read about 4 km fast.
AnswerID:
176142