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3 Speed vacuum advance switch ?


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#1 UCSLE

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Posted 15 November 2022 - 04:54 PM

have a old smooth case 3 speed here that i have just started working and noticed there is a switch on the 2-3 selector .

 

Is it supposed to have one ? thought only later boxes got them 

 

also notice there is no flat spot on the shaft for the switch to work compared to the 4 speed

 

I'm guessing the gearbox is a bitsa 

 

Picture is of the cover off the 3 speed

Attached File  cover.jpg   243.51K   2 downloads

 

Attached File  DSCF4075.jpg   194.75K   2 downloads

 

 

 

 

 

 

 

 



#2 claysummers

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Posted 15 November 2022 - 05:02 PM

I put a smooth case one in a car just last week or I could have checked the part number, but definitely no switch on the selector shafts. Would have commenced in HX 1977.


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#3 yel327

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Posted 15 November 2022 - 05:07 PM

Yes started with ADR27A in some late Pagewood HJ.

#4 Dr Terry

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Posted 16 November 2022 - 06:51 AM

That 2-3 shaft is from an early gearbox. It has an o-ring & no cut-out for the switch.

 

The later shaft requires no o-ring because there is a proper seal in the gearbox, which you can see in the pic.

 

Dr Terry



#5 UCSLE

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Posted 16 November 2022 - 07:53 PM

that makes sense,  might have at look at making a new cover or just making a bush so its not seal on seal



#6 yel327

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Posted 16 November 2022 - 08:03 PM

Just find the right fit HK to HJ side cover off a 3spd or 4spd. Still heaps around.




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