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General Category => CF Bedford Chat => Topic started by: rizzo on September 17, 2011, 10:30:10 PM

Title: speedo
Post by: rizzo on September 17, 2011, 10:30:10 PM

Hi guys my 74 bedford has a speedo problem it jumps around and i have now idea what speed iam going has any one got any ideas thanks rizzo out

Title: Re: speedo
Post by: Jeff on September 17, 2011, 11:41:45 PM

I'd say about 85 tops.......

This can be a sign that the cable is frayed. It keeps sticking and letting go , giving a jumpy movement.

Title: Re: speedo
Post by: LS120 on September 18, 2011, 07:08:10 AM

if it has a holden gearbox it could be the gears in it as mine did that until i put the right gear in the speedo cable end on the box. thers was a red/pink & greenish one & i used the greenish one  from memory as the pink one did the jumping around this on me..

Title: Re: speedo
Post by: petrolhead on September 18, 2011, 07:35:49 AM

First lets do the easy bit, undo the speedo cable from the speedo, now pull the core out and check for damage, if no damage wipe clean, apply wheel bearing grease and re install, if damaged take sample to Flexi Drive get a new one and install, if still bounces it'll be the gear

Title: Re: speedo
Post by: rizzo on September 18, 2011, 11:40:55 AM

Hi and thanks for the info iam pulling it to bits now rizzo out

Title: Re: speedo
Post by: ben on September 18, 2011, 09:51:45 PM

Quote

First lets do the easy bit, undo the speedo cable from the speedo, now pull the core out and check for damage, if no damage wipe clean, apply wheel bearing grease and re install, if damaged take sample to Flexi Drive get a new one and install, if still bounces it'll be the gear

spot on!!!! this makes a huge difference!

Title: Re: speedo
Post by: Sweet Shock on September 19, 2011, 05:27:58 PM

I changed my cable because of this problem and it has improved but it still moves a bit and I have a red one and my speedo is out a few ks so if anyone knows the correct colour one for a 253 trimatic  with 14 diammeter wheels let me no thankx

Title: Re: speedo
Post by: cfjeff on September 19, 2011, 08:48:00 PM

So far as I'm aware there are at least 5 different speedo cogs for holden gearboxes, I have a red, a green, a white and a yellow/orange one. And apparently there is a Gray one. The difference is the number of teeth on each which is what alters the speedo reading. Apparently you can get them from rare spares new.

Cheers Jeff

Title: Re: speedo
Post by: ben on September 20, 2011, 10:44:01 AM

what diff ratio pete? diff ratio makes a lot more difference to the speedo than wheels or motor

there is also adjustment on bedford speedos altho ive never tried using it.

Title: Re: speedo
Post by: Sweet Shock on September 20, 2011, 08:53:26 PM

I thing mines 2.75, 

Title: Re: speedo
Post by: Marishka on September 20, 2011, 11:01:24 PM

rizzo,
like Jeff n petrolhead said  the usual reason the speedo,s jomp is because you will probebly have a kink in the inner cable or sometimes they have a fray.
pull the innercable  out and check for a kink/bend.
i also put a post in here somwhere about the adjustment on the speedo gauge, maybe someone could locate it n bump it to the front?
 
 cheers marty

Title: Re: speedo
Post by: rizzo on September 26, 2011, 03:45:42 PM

Hi there guys and gals found the problem plastic gearbox gear worn and teeth broken off will get one at rare spares ? thanks for all your input buga is the place to be rizzo out