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 Gearbox neutral switch

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Belfastguzzi
Tanabuso
Tanabuso


Posts : 56
Join date : 2015-05-19

PostSubject: Gearbox neutral switch   Sun Apr 24, 2016 4:16 am

I don't think mine was the only early GRiSO that suffered from a neutral light that only worked half-time. Has this problem gone away with later years' parts? I've had a new switch to fit for some time but the switch is difficult to access. I previously asked in various places for advice or if anyone had photos but there wasn't response. I've done a search here and I don't see anything on this, so now here are a few photos.

At last I've taken the airbox out to change the switch. In the box there is some sort of shaft with a flat area on it to actuate the switch plunger. In the photo of my original switch and the newer switch, you can see that the newer part has a slightly longer plunger. I am hoping that the plunger length/action is the source of the problem and that now the neutral indicator light will function correctly. Has anyone else found that changing the switch sorted out this issue?

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beetle
GRiSO
GRiSO


Posts : 3976
Join date : 2013-09-30

PostSubject: Re: Gearbox neutral switch   Sun Apr 24, 2016 4:34 am

Thanks for posting this. I frequently have trouble getting the light to activate, and I recall Pete telling me it was in a right frontbottom of place to get at. I see that now. I'm not sure I want to swap it out just yet, but at least I can see how to.
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Belfastguzzi
Tanabuso
Tanabuso


Posts : 56
Join date : 2015-05-19

PostSubject: Re: Gearbox neutral switch   Sun Apr 24, 2016 4:53 am

You need to get a box spanner on it as there isn't much space between the switch nut and the gearbox case and its sitting in a sunken position between stuff.. There's no room for manoeuvre without taking airbox out of the way.
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waterbottle
GRiSO
GRiSO


Posts : 1041
Join date : 2015-02-02
Age : 55

PostSubject: Re: Gearbox neutral switch   Sun Apr 24, 2016 12:31 pm

I see you use one of my prefered methods for measuring, the bamboo kebab stick.
Good job Thumbs Up
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Pete Roper
GRiSO
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Join date : 2013-05-29
Age : 59

PostSubject: Re: Gearbox neutral switch   Sun Apr 24, 2016 1:30 pm

Very early in the life of the 'Nuovo Six Speed' there was a service bulletin released by the factory stressing the importance of always using a new sealing washer and torquing the sender very precisely.

Having said that in my experience the only issues I've seen have been caused by a loose connection betwixt spade and button on the end of the switch. In general I've found the switches, like the gearboxes themselves, to be bulletproof.

Pete
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Belfastguzzi
Tanabuso
Tanabuso


Posts : 56
Join date : 2015-05-19

PostSubject: Re: Gearbox neutral switch   Sun Apr 24, 2016 3:16 pm

Bamboo skewer: every garage should one, preferably more than one. Also cocktail sticks.

Sealing washer: in that case it would be helpful for MG to extravagantly include a little washer in the packet with the new switch. Hey, hmm I've just noticed in the service manual that I have, the switch is shown in a different location. A mistake in where the line is drawn, or did early / 1100 boxes have the switch in a different place? (Hole in top of gearbox.)

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Belfastguzzi
Tanabuso
Tanabuso


Posts : 56
Join date : 2015-05-19

PostSubject: Re: Gearbox neutral switch   Sun Apr 24, 2016 3:27 pm

The spade connection isn't great, but my half-time operation hasn't been due to that. As the top terminal is the accessible part of the switch I have checked that connection on various occasions and ensured it was tight. I replaced the spade too, soldered the wire, stuck the boot to the case so it didn't jiggle about...

The original switch does have less plunger movement than the new one, so the off/on transition happens very quickly.
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beetle
GRiSO
GRiSO


Posts : 3976
Join date : 2013-09-30

PostSubject: Re: Gearbox neutral switch   Sun Apr 24, 2016 3:48 pm

Belfastguzzi wrote:


The original switch does have less plunger movement than the new one, so the off/on transition happens very quickly.


Goodo. This is what I want. My neutral light works OK, it's just I have to often lightly caress the gear lever to get it come on.
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bahamazoo
Don Abbondio
Don Abbondio


Posts : 164
Join date : 2015-08-09
Age : 52

PostSubject: Re: Gearbox neutral switch   Sun Sep 25, 2016 4:51 am

A right front-bottom indeed!
I managed to get mine off on the Sport, 'adjust' the grip of the spade, and replace it by removing the pork chop and disconnecting a few plugs and moving one of the relays.
But... from reading here and elsewhere, it seems that you can start with an inoperable neutral light.
My Sport however, seems to be a 'no light...no go' issue.
No green light, definately in neutral, clutch in, stand up and all combinations of the set.... no go.
Wiggled the spade connection and got a green, and got a start.

I await the invaluable insight gentlemen...
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jean cool
Tanabuso
Tanabuso


Posts : 52
Join date : 2016-08-29

PostSubject: Re: Gearbox neutral switch   Sun Sep 25, 2016 3:46 pm

Hello bahamazoo

Check and see with Guzzidiag, look switch operation CLUTCH: means contact open/closed.
                                      operation STAND : means contact open/closed

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Pete Roper
GRiSO
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Age : 59

PostSubject: Re: Gearbox neutral switch   Mon Sep 26, 2016 12:04 am

To the best of my knowledge the switch position hasn't changed with the two gearbox designs. The changes are all internal and don't affect the shift mechanism.

There was a service bulletin early in the piece about the necessity of being very accurate with the torque on the switch and the importance of always using a new washer. Perhaps the newer switches have a longer throw? I dunno, I've never had to replace one.

Pete
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bahamazoo
Don Abbondio
Don Abbondio


Posts : 164
Join date : 2015-08-09
Age : 52

PostSubject: Re: Gearbox neutral switch   Mon Sep 26, 2016 1:49 am

Cheers JC and Pete (not the first time those two have appeared in a sentence I'll bet!!!)

After contemplating the last drop of a bottle of OverProof Fiji Rum just now,
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I realised that my 'all combinations' occurred with a clapped out juice box. Embarassed
She was never gonna start Very Happy
After replacing said box with 400CCA, I had a no start with the neutral switch plug off the sender unit as I was in gear... Evil or Very Mad the rum was in its penultimate phase at this stage, so the no start was a bit of a godsend... (insert vision of bike starting and running rampart across the garage).
I haven't had opportunity for a run, but she gives me a green light on key turn now, and starts straight up...
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PostSubject: Re: Gearbox neutral switch   Today at 1:42 am

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