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Author Topic: CJ Speedo  (Read 2565 times)

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IrishCJ6

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CJ Speedo
« on: April 23, 2011, 10:48:18 AM »
I think my speedo that came with the Jeep is knackered, the dial needle sits at 20 MPH mark instead of zero at rest? Is my assumption right? Any ideas where I would find a replacement, mine is the old style without the fuel gauge and temp gauge.

Also how is the speedo calibrated for different gearing/wheel sizes
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Nosebolt

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Re: CJ Speedo
« Reply #1 on: April 23, 2011, 11:07:11 AM »
as with most of the original gauges, the speedo is an optimistic estimate of what your actually doing. there are places that will recalibrate but we have a calc on the site where you can enter -

Original Tire Diameter:    New Tire Diameter:    Speedometer Reading (M.P.H.):  and it will tell you the Corrected Speed(M.P.H.):

so for example if you have 33s and speedo is correct at 30MPH the fitting 35s will mean when you are showing 30 you are travelling at 31.818 MPH

the easy answer is then to put a mark on the speedo at 30, 50 etc
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IrishCJ6

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Re: CJ Speedo
« Reply #2 on: April 23, 2011, 11:10:06 AM »
Thats all good but I have no idea what the original wheel sze is, spose I could always use the GPS to find ot as well, wasn't sure if there was different drive gears to alter the reading
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ferretjuggler

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Re: CJ Speedo
« Reply #3 on: April 23, 2011, 11:21:19 AM »
There must be different drive gears available.

These Jeeps came with a choice of axle ratios didn't they :017:
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Nosebolt

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Re: CJ Speedo
« Reply #4 on: April 23, 2011, 11:22:56 AM »
original fit was a 670-15 cross ply, this had a dia of 726mm or 28.58"

going by that on 35s when std speedo reads 30 you are doing 36.7, bear in mind all of this is subject to the rest of the gearing being standard
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Nosebolt

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Re: CJ Speedo
« Reply #5 on: April 23, 2011, 11:44:42 AM »
hopefully I will be corrected or confirmed but from a quick read it seems there are 2 std CJ speedo gearings identified by the face, 0-85 & 0-90, both also available in KPH, but can only find replacements with fuel and temp, now heres the bit I'm not to sure about, there may have been some early 6's that had 3B speedos fitted, a pic and some dimensions would help if available
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IrishCJ6

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Re: CJ Speedo
« Reply #6 on: April 23, 2011, 11:59:19 AM »
Here is the photo of the speedo, don't have a measurement though



So do you think its busted?
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Bulldog67

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Re: CJ Speedo
« Reply #7 on: April 23, 2011, 12:22:45 PM »
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ferretjuggler

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Re: CJ Speedo
« Reply #8 on: April 23, 2011, 12:56:33 PM »
Mr Phillips, wash down your keypad down with soap and water at once!

Most of us CJ owners are happily lurking in a sort of  pre-microchip stone age type existence thankyou.

Not a digit in sight :greggmo:
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Bulldog67

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Re: CJ Speedo
« Reply #9 on: April 23, 2011, 03:32:55 PM »
I am the future  :hysterical:
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Mike Pavelin

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Re: CJ Speedo
« Reply #10 on: April 23, 2011, 07:57:26 PM »
Replace the drive gear to calibrate the speedo. Here are the part numbers......                                                                                          J321 2724 1 24 Teeth - White
J321 2725 1 25 Teeth - Blue
J321 2726 1 26 Teeth - Red
J321 2727 1 27 Teeth - White
J321 2728 1 28 Teeth - Blue
J321 2729 1 29 Teeth - Black
J321 2730 1 30 Teeth - Yellow
J321 2731 1 31 Teeth - Green
J321 2732 1 32 Teeth - Black
J321 2733 1 33 Teeth - Yellow
J321 2734 1 34 Teeth - Green
J321 2735 1 35 Teeth - Orange
J321 2736 1 36 Teeth - Red
J321 2738 1 38 Teeth - Blue
J323 0221 1 39 Teeth - Green
J323 0222 1 40 Teeth - Orange
5300 1488 1 41 Teeth - Red
5300 1489 1 42 Teeth - White
J323 8143 1 43 Teeth - Blue
J323 8144 1 44 Teeth - Black
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Bubba

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Re: CJ Speedo
« Reply #11 on: April 23, 2011, 08:02:27 PM »
i dont thunk they will work  as i they aree for post amc jeeps
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Bulldog67

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Re: CJ Speedo
« Reply #12 on: April 23, 2011, 09:38:32 PM »
Quote from: Mike Pavelin on April 23, 2011, 07:57:26 PM
Replace the drive gear to calibrate the speedo. Here are the part numbers......                                                                                          J321 2724 1 24 Teeth - White
J321 2725 1 25 Teeth - Blue
J321 2726 1 26 Teeth - Red
J321 2727 1 27 Teeth - White
J321 2728 1 28 Teeth - Blue
J321 2729 1 29 Teeth - Black
J321 2730 1 30 Teeth - Yellow
J321 2731 1 31 Teeth - Green
J321 2732 1 32 Teeth - Black
J321 2733 1 33 Teeth - Yellow
J321 2734 1 34 Teeth - Green
J321 2735 1 35 Teeth - Orange
J321 2736 1 36 Teeth - Red
J321 2738 1 38 Teeth - Blue
J323 0221 1 39 Teeth - Green
J323 0222 1 40 Teeth - Orange
5300 1488 1 41 Teeth - Red
5300 1489 1 42 Teeth - White
J323 8143 1 43 Teeth - Blue
J323 8144 1 44 Teeth - Black

gordon bennett  :icon_eek:

my vote says live with it  :003:
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Civilise the mind but make savage the body  :027:           Im only responsible for my karma :059:

Mike Pavelin

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Re: CJ Speedo
« Reply #13 on: April 23, 2011, 10:15:05 PM »
Quote from: V8 Bubba on April 23, 2011, 08:02:27 PM
i dont thunk they will work  as i they aree for post amc jeeps
They're from the '81-'86 parts list
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Bubba

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Re: CJ Speedo
« Reply #14 on: April 23, 2011, 11:35:32 PM »
well cool mike i had no idea i take back my first statement
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shedric
cletus
mr whippy

I spent most of my money on alcohol, women and old  iron........ the rest of it I just wasted.

dieselj20

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Re: CJ Speedo
« Reply #15 on: April 24, 2011, 10:37:24 AM »
late type gears only fit 81 on . Early gears go from 1941 to late 1980
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IrishCJ6

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Re: CJ Speedo
« Reply #16 on: April 26, 2011, 08:36:26 PM »
Ok so I decided to open the speedo up and look at why the needle is not sitting at zero, unfortunatley it looks like I was not the first to open it up as the speedo does infact have the 2 small water temp/fuel gauges installed however the previous owner had blanked these off using black card as they were not used with the revised motor/trans setup. So I'm looking for a replacement speedo if someone has one
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Bubba

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Re: CJ Speedo
« Reply #17 on: April 26, 2011, 09:41:50 PM »
hmmm is that so
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trucks


shedric
cletus
mr whippy

I spent most of my money on alcohol, women and old  iron........ the rest of it I just wasted.

IrishCJ6

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Re: CJ Speedo
« Reply #18 on: April 26, 2011, 09:44:16 PM »
Does that mean you may have one Bubba
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