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Nissan S30Z Chassis Datum Points


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#1 gav240z

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Posted 04 November 2017 - 07:55 PM

Hi Folks,
Does anyone know of any documentation that has datum points of reference for measuring "trueness" of a chassis? I am having difficulty with bonnet alignment on my Safari Gold car and I bought a reproduction bonnet - which looks good but I still don't think I can easily get to fit without possibly "tweaking" it.

I'm looking to get a plumb bob and use this to make sure the car is true.

#2 AndBir

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Posted 04 November 2017 - 08:10 PM

I understand the Service Manual has,  Section BF : Body,  that has the underbody alignment.

 

This is the one for the 260Z (probably USA as well) : 260Z_Underbody Alignment.JPG


Edited by AndBir, 04 November 2017 - 08:14 PM.

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#3 gav240z

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Posted 04 November 2017 - 08:24 PM

Ok found these.

http://www.viczcar.c...imension-plans/
http://www.viczcar.c...-plans/?p=32117
http://www.classiczc...240z-available/
http://forums.hybrid...l-tape-measure/
http://www.vord.net/...chassis-jig.htm
http://www.vord.net/...chassis-jig.pdf

http://www.xenonzcar.com/s30/fsm.html
http://xenonzcar.com... Supplement.pdf

#4 zed74

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Posted 06 November 2017 - 06:38 PM

its also not unusual to have to "tweak" the original factory bonnets...


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#5 gav240z

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Posted 06 November 2017 - 10:12 PM

its also not unusual to have to "tweak" the original factory bonnets...


Yes, but how so? It sits high at the rear currently and a little too far back. I see evidence that a few things were tweaked on the car previously from the minor front-end love nudge.

#6 zed74

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Posted 07 November 2017 - 05:49 AM

Yes, but how so? It sits high at the rear currently and a little too far back. I see evidence that a few things were tweaked on the car previously from the minor front-end love nudge.

I have had previous issues & my panel man has effectively induced extra curve in bonnet shape to achieve smooth consistent lines of bonnet/fender junctions. It looks frightening to witness!

sitting too far back just sounds like you need to slot the bonnet holes for the hinges?


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#7 gav240z

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Posted 07 November 2017 - 09:29 AM

haha, yes I can see why it might need extra curvature and I thought of the same thing perhaps with a block of wood underneath, but didn't want to do that on a reproduction panel, especially if the rest of the car was not quite right.

I did notice the reproduction hood mount holes appeared smaller (less adjustment) than the factory ones. So may make a template of the factory ones and transfer that onto the reproduction hinges (using a file).

I've run out of adjustment on the hinges themselves where they mount to the car.

Another thing I noticed was that the grille mounting brackets are way out of whack compared with the grille itself, but I wasn't sure if that was because I 'rebuilt' a grille or because the body had moved around at the front.

#8 gav240z

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Posted 07 November 2017 - 01:06 PM

These photos highlight the issues I think well.

I haven't spent hours adjusting this 1 (reproduction), but when I borrowed a hood off someone else. It almost fit like a glove.

Which is why I assumed this shouldn't need much tweaking...

I can elongate the mounting holes to move it forward a little, but the raised section at the rear might be because it needs more curvature.

Just a bit worried about tweaking a hood to fit the car, if the car is slightly out.

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#9 zed74

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Posted 09 November 2017 - 06:54 PM

I think another original bonnet maybe the answer if fitment was spot on.. :)


Edited by zed74, 09 November 2017 - 06:55 PM.


#10 gav240z

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Posted 09 November 2017 - 07:55 PM

Yeah I'm inclined to agree, thing is the car has had a light front end nudge. So I know at least it's partially out on 1 side, this is the bonnet I borrowed off someone and it fit better than my repaired hood and the reproduction hood.

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#11 gilltech

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Posted 09 November 2017 - 08:26 PM

Whoever you borrowed that bonnet off needs to get some rust neutralizer on there asap. Just saying. Unless it's the ratrod look he wants of course.....

Curious, Gav, in your last photo there, your grille lower fixing brackets turn downwards. But they turn upwards on my early '74 260, I'd thought the radiator support & slatted grille would be the same as 240, or is yours different being an early car?



#12 gav240z

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Posted 09 November 2017 - 08:31 PM

240z/260z Grille mounting points are a bit different.
http://www.viczcar.c...wards/?p=178244

Having said that I need to tweak them a little to fit my rebuilt grille!

#13 gilltech

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Posted Yesterday, 05:50 PM

Oh, thanks, now I see. FWIW my original grille is different again from those two, I have 3 lengths of slat not two.






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