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Novice needs help fitting 240z steering wheel pleeease !


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#1 Datsun260z

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Posted 23 December 2014 - 04:54 PM

Hello and seasons greetings to all..
Having a slight problem in fitting a 240z steering wheel to my 260z and would greatly appreciate any advice thanks.
After removing aftermarket wheel/boss kit and then putting 240 wheel on spline - the moment it contacted column internals horn goes off?
I dont understand why as not applying any pressure or having yet even tightened spline /column steering nut.
Is there some difference in 240z and 260z setup here or am I doing something wrong  ???

#2 Mr Camouflage

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Posted 23 December 2014 - 05:28 PM

http://www.viczcar.c...p?topic=12109.0



#3 Datsun260z

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Posted 23 December 2014 - 05:58 PM

http://www.viczcar.c...p?topic=12109.0


I appreciate the link and I actually did read it prior to this question but it is of no help as this seems to be a different problem.
My horn contact is actually same as last pic in link so this is not the issue.I notice though a spring is mentioned-does this sit behind wheel to prevent immediate contact ?

#4 Mr Camouflage

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Posted 23 December 2014 - 06:08 PM

Pics of what you currently have would help.

Basically there is a spring arm that supplies +ve voltage to the back of the steering wheel, and the black wire in the photos in the other thread connects the back of the wheel to the electrically isolated spring horn ring. If the ring is not electrically isolated the horn will sound constantly. What happens if you disconnect the black wire?



#5 Datsun260z

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Posted 23 December 2014 - 08:06 PM

okay -disconnected black wire and managed to seat wheel on spline without horn sounding but of course end result is i now dont have ability to use horn at all.
Think I will just put sports wheel back on and be done with ito obviously (although I was advised otherwise on this forum) this wheel does not suit the 260

#6 gilltech

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Posted 23 December 2014 - 10:23 PM

FWIW, a while ago now I also bought a 240 wheel with horn pad to install on my 260, & couldn't figure out why I couldn't get the horn to work.
Is the 260's steering column & horn contact set-up different in some respect? I don't have a 240 column to compare the two side-by-side.

#7 Mr Camouflage

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Posted 23 December 2014 - 10:53 PM

okay -disconnected black wire and managed to seat wheel on spline without horn sounding but of course end result is i now dont have ability to use horn at all.


That was just part of the troubleshooting process. Obviously theres a problem with the isolating ring then. Do you have a multimeter?

Post some photos of what you have. Dealing with this over the internet with a vague description is impossible.



#8 Mr Camouflage

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Posted 23 December 2014 - 11:35 PM

Is the 260's steering column & horn contact set-up different in some respect? I don't have a 240 column to compare the two side-by-side.


They are all pretty similar. You just need to make sure the arm touches the track on the back of the steering wheel.
See pictures of 240/260/280 parts here http://www.new-datsu...electrical.html

#9 gilltech

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Posted 24 December 2014 - 09:27 AM

Thanks Mr Camo. I think the problem with mine could be that the 260's spring doesn't seem to fit the 240's steering wheel, well that's if the 240 uses a spring under the hub.

#10 Mr Camouflage

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Posted 24 December 2014 - 09:59 AM

Thanks Mr Camo. I think the problem with mine could be that the 260's spring doesn't seem to fit the 240's steering wheel, well that's if the 240 uses a spring under the hub.


The spring arm attached to the indicator assembly?  or the coil spring on the 260z assembly? If the latter:

It doesn't. You don't use the 260Z spring.  Its a completely different set up.

You need to use the horn equipment that comes with the 240Z wheel. In that case there is no spring that you can see. its all captive within the horn equipment (see the photo I posted in your other thread) - notice you don't see a spring anywhere. The centre cap just clips on there and thats it.

Check out this thread for an exploded diagram of the 240Z horn assembly
http://www.classiczc...-view/?p=257364


Although this guy did manage to swap a later horn button onto a 240z wheel if you don't have the 240Z horn assembly:
http://dailydatsun.c...g-the-horn-pad/

#11 Datsun260z

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Posted 24 December 2014 - 10:23 AM

And my thanks too Mr Camo-appreciate your assistance here-seems like this is a tricky question at best .
Anyhow-when I disconnected black wire horn stopped but after I attatched wheel nut and later turned wheel it sounded again,so back to square APosted Image[URL=http://s21.p

#12 Mr Camouflage

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Posted 24 December 2014 - 10:59 AM

Sounds like the spring arm might not be aligned correctly if you are having issues when turning the wheel.

If the spring arm strays off the track and touches the hub it would cause the horn to sound. Maybe some careful adjustment of the arm is needed
This is the bit i'm talking about: http://dailydatsun.f...ing-wheel-7.jpg

What's yours look like? and maybe post a pic of the back of the wheel too.

Next thing I'd do it disassemble the horn assembly and make sure nothing internal is shorting out.

#13 Datsun260z

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Posted 24 December 2014 - 11:11 AM

Okay-after seeing your link Mr C . of the exploded view it seems I was remiss in my initial question put to this forum of-"does anyone know if the 240z steering wheel will fit the 260z" when I SHOULD have asked-
Will the 240z steering wheel fit the 260z ..AND .. will the horn activator be compatible.
Well in fairness - the first question was answered correctly, but the horn is the oversight here as they are completely different and totally uncompatible and would require additional parts or scratchbuilt replacement of required parts to do job.
I've decided to give up on this idea , firstly I dont have the mechanical know how to go any further and secondly I need the car for Christmas Day so its back with the sports wheel and an end to this stress !
Thanks for your help Mr C - hope you have a great Christmas !!



#14 Mr Camouflage

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Posted 24 December 2014 - 11:29 AM

Okay-after seeing your link Mr C . of the exploded view it seems I was remiss in my initial question put to this forum of-"does anyone know if the 240z steering wheel will fit the 260z" when I SHOULD have asked-
Will the 240z steering wheel fit the 260z ..AND .. will the horn activator be compatible.
Well in fairness - the first question was answered correctly, but the horn is the oversight here as they are completely different and totally uncompatible and would require additional parts or scratchbuilt replacement of required parts to do job.
I've decided to give up on this idea , firstly I dont have the mechanical know how to go any further and secondly I need the car for Christmas Day so its back with the sports wheel and an end to this stress !
Thanks for your help Mr C - hope you have a great Christmas !!


It should work and be a straight swap if you have the 240Z wheel, horn assembly and horn button, only gotcha I can see is the spring arm might be slightly different, but I don't have a Z handy to compare.  Of course these are 40 year old parts and things wear out, previous owners mangle stuff, etc.

Maybe a handy member local to you could have a look at it when you have some free time.

One last thing i'd check is that there is a decent gap between the top ring and the lower contact ring. I think you can adjust this by loosening the 3 screws slightly, although its a been a long time since I've seen a Z wheel. I'm not sure if its possible but if someone overtightened the screws there might not be a gap, therefore the horn would sound.

#15 gilltech

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Posted 24 December 2014 - 11:29 PM

Mr Camo you're the font of Z knowledge, thankyou for taking time to help out, I'll have a fresh try at installing the 240 wheel on my 260.

#16 Datsun260z

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Posted 26 December 2014 - 03:49 PM

Hi guys  although this has gotten the better of me I know I am not the only one here totally stumped by this problem so I am posting pic of my steering column internals in case this helps in anyway.Once again my profound thanks to the awesome Mr Camo for his patient and gracious help herePosted Image....As can be seen the spring arm on the 260 appears to be attatched to opposite position of 240 spring arm

#17 Mr Camouflage

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Posted 27 December 2014 - 12:30 AM

The previous photos were from LHD cars - they were all I could find on the net. RHD are mirrored, so the same as yours.

Its a basic switch design. +ve voltage comes from the spring arm, to the track on the back of the wheel (isolated from ground), The wire carries the +ve to the top isolation ring.  When the isolation ring is depressed it makes contact with the second ring which is earthed via the steering wheel/column completing a circuit, closing the horn relay that sends 12 volts through the horns to ground.

Make sure the track and the spring arm contact are clean (use a bit of emery cloth or other suitable abrasive paper to clean them up), and maybe apply a bit of electrical grease or vasoline to stop them oxidising.

Some tests you can do:
With steering wheel off, use bit of wire to earth the spring arm to the steering column centre :  horn should sound
(If it doesn't you may have a problem with a fuse or the horn relay)
If horn sounds, With steering wheel on, use a bit of wire to earth the top ring to the steering column centre : horn should sound
If not, then there is a problem with the spring arm not contacting the track on the back of the wheel, or the wire is not conducting voltage to the top ring.
Some gentle bending of the spring arm may be required so it makes good contact.

Try pressing the horn ring directly, without the centre button trim thing on. Horn should sound.
If your horn button is cracked it may not allow the ring to depress properly.

Some test you can do with the wheel itself: If you have a multimeter, set it to measure resistance.
With the steering wheel off test that there is an open circuit between the track and the centre splines. 
Have someone press the horn ring, resistance should drop to about 0 ohms.
If it doesn't there is a problem with the horn assembly and should should take it apart and inspect it.

With the steering wheel on, test that you have voltage between the horn ring (+ve lead) and the steering column (not horn should sound) and meter should read around 12 volts I'd guess.

Thats about all I can think of.



#18 Datsun260z

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Posted 27 December 2014 - 12:50 PM

Ok thats very helpful-yet again.
Thankyou kindly I will try to get to the bottom of this over the next few days.
Best regards and profound thanks for your knowledge/advice :D

#19 Datsun260z

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Posted 28 December 2014 - 06:16 PM

Hello again Mr Camouflage--just noticed an obvious difference in the internals with my 260z pic showing black wire attatched to rear of spring arm and your earlier post of the 240z not showing any wire attatched.
Also note that spring arm of 240 is much closer to edge of column than my 260.Surely then it must be either of /or combination of both ,that that is creating the problem? What do you think ??

#20 gilltech

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Posted 30 December 2014 - 01:48 PM

Well further to this, I've just compared the back faces of the 240 & 260 steering wheels, & they look identical.

From looking at the 240 wheel pic one of you posted, the bit I'm missing is whatever the little black wire attaches to on the front face - on the 240 wheel I bought there's just a hole, whereas there must be meant to be a little captive nut, to screw into, maybe with an insulation collar around it? Can someone please advise?




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