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» no posts by L88 on Sat 19 May 18 12:41

dashboard removal?



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frogeyeman

Club Member

Sun 03 Dec 17 00:08

dashboard removal?


Car is a 1978 anniversary model. Do you really need to remove instruments(speedo/rev counter) just to change the bulb for the indicator tell tell? The workshop manuals I have do not even mention these bulbs or what size/type they are. Do not like removing dash equipment as you tend to disturb other wiring. Any help appreciated.

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roscobbc

Committee Member

Sun 03 Dec 17 03:15

Re: dashboard removal?


If you are athletic and agile lie on your back with your head and shoulder under the dash and in the footwell with your legs over the seat back. Can't guarantee you'll ever get yourself out again so best remove driver seat to make it easier. It is accessible from underneath but difficult. You might want to remove centre console which should allow you to remove lower fixings for dashboard and pull the bottom of it out a bit to make access a little better. A gynecological doctorate may also help Banghead


--------------------
CCCUK Chairman & Editor, Vette News
'68 coupe - 4 speed - 3.08 - 489 cu in - 570 bhp @ 5850 rpm - 606 ft/lbs torque (821 Newton Metres) @ 3850 rpm
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kentvette

Club Member

Sun 03 Dec 17 10:28

Re: dashboard removal?


frogeyeman wrote (View Post):Car is a 1978 anniversary model. Do you really need to remove instruments(speedo/rev counter) just to change the bulb for the indicator tell tell? The workshop manuals I have do not even mention these bulbs or what size/type they are. Do not like removing dash equipment as you tend to disturb other wiring. Any help appreciated.

Yes, you need to at least pull the Speedo/Tach assemble out someway from the dash.

The workshop manuals all tend to refer to the pre-78 dash, and I understand that it is much more tricky to change bulbs on those cars. They talk about lowering the steering column, definitely NOT required!

But on our '78s, the main "speedo/tach" assembly will come away without the need to remove anything else. It is a job that requires a bit of patience, and perhaps some dexterity, but it's not hard.

With good light you will see that there are screws around the edge of the assembly holding it to the actual dash. Remove each of these. You can then carefully pull the assembly towards you. But, it will not come very far until you release the speedo cable. That is held in by a clever spring clip that needs a tab to be pushed to release the cable. If you can get under and have a look, you will see what I mean. (that's the tricky part, getting yourself into the foot well so that you can see up underneath! Alternatively, try and use a mirror, a dentists type is good, to see the clip.)

Once you have "popped" out the cable, pull the unit out very carefully, it is still connected to the electrical harness. You can unplug the harness as it is one large plug.

The bulbs are held in small holders that, from memory, they twist out? They connect into the flexible "circuit board" in teh back of the unit. I think they are alll the "all glass" type of bulb.

As they say in the manuals, re-assembly is teh reverse! To get the speedo cable back in, locate it in it's hole and push in until the clip "clicks" into place. Push the unit back into the dash and replace the screws.

I'm afraid I can't tell you what the wattage is for the bulbs though, I think I got mine from Claremont, so Tom knew! I'm gussing only a couple of watts.



Last edited by kentvette on Sun 03 Dec 17 10:29; edited 1 time in total. [3 %]
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Stephen J Irons
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Corvette Club France
Corvettes of Southern California
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Red Corvettes Have More Fun!

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roscobbc

Committee Member

Sun 03 Dec 17 11:41

Re: dashboard removal?


Nice detailed response Stephen Thumbs up some at this point choose the led bulb option - kinda fit-it & forget Scratchchin


--------------------
CCCUK Chairman & Editor, Vette News
'68 coupe - 4 speed - 3.08 - 489 cu in - 570 bhp @ 5850 rpm - 606 ft/lbs torque (821 Newton Metres) @ 3850 rpm
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frogeyeman

Club Member

Mon 04 Dec 17 00:06

Re: dashboard removal?


Thanks for your responses. I did not think it would be possible to remove bulb without taking some part of the dash out. I will get the bulbs from Claremont before I start the job. I assume that you can get an LED to replace the original bulb? I will ask Tom about it. Thanks for your help. Thumbs up

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