Overdrive inhibit switch. An alternative?

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Overdrive inhibit switch. An alternative?

Post by simmit » Tue Dec 29, 2015 10:27 am

Shall be grateful for comments on suitability of this ebay switch to replace faulty existing one. Switch is for use with early two rod gearbox and overdrive:-
http://www.ebay.co.uk/itm/Knurled-Ring- ... Sw4UtWTgIz



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Re: Overdrive inhibit switch. An alternative?

Post by scimjim » Tue Dec 29, 2015 10:41 am

No, it's off/on(1)/on(1+2) so the overdrive could be engaged in reverse. You need off/on(1)/on(2).


Jim King

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Re: Overdrive inhibit switch. An alternative?

Post by simmit » Tue Dec 29, 2015 11:45 am

scimjim wrote:No, it's off/on(1)/on(1+2) so the overdrive could be engaged in reverse. You need off/on(1)/on(2).
Thanks Jim.
I assume the on(1+2) connection might be for reverse light plus overdrive. But what if we do not wire in the on(1+2) connections? Then would the switch be simply off/on(1) and the reversing light could be wired independently. After all there is no legal reason the reversing light must come on when reverse is engaged, is there?



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Re: Overdrive inhibit switch. An alternative?

Post by scimjim » Tue Dec 29, 2015 11:48 am

That would work but you may as well use a two position switch in that configuration?


Jim King

Current: SE5 (8Ball), TI SS1 (snotty), 1600 SS1 (G97), 1600 SS1 (C686CCR), 2.5TD SE5a (diesel 5a), 6 x random other SS1s.
Previous: SE5, 3 x SE5a, 2 x SE6a, 3 x SE6b, GTC, 2.9i GTC, 3 x 1600 SS1, 1300 SS1, Mk1 Ti Sabre, Mk1.5 CVH Sabre
Chief mechanic for: 1400 K series SS1 (Megan3), 1400 CVH EFi SS1 (Grawpy), Sabre/MX5 auto (The Flying Broomstick),
1300 SS1 (Number One) & Sarah's coupe.
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Re: Overdrive inhibit switch. An alternative?

Post by simmit » Tue Dec 29, 2015 1:41 pm

scimjim wrote:That would work but you may as well use a two position switch in that configuration?
I've not studied movement of the lever that operates the switch but, dependent on gear selected, does it go to one of three positions? If so then a two position switch would break if forced into a third position.



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Re: Overdrive inhibit switch. An alternative?

Post by scimjim » Tue Dec 29, 2015 6:01 pm

Yes but fairly easy to modify the lever. Not sure what the basis of this excercise is - personally I just fitted a new switch :-)


Jim King

Current: SE5 (8Ball), TI SS1 (snotty), 1600 SS1 (G97), 1600 SS1 (C686CCR), 2.5TD SE5a (diesel 5a), 6 x random other SS1s.
Previous: SE5, 3 x SE5a, 2 x SE6a, 3 x SE6b, GTC, 2.9i GTC, 3 x 1600 SS1, 1300 SS1, Mk1 Ti Sabre, Mk1.5 CVH Sabre
Chief mechanic for: 1400 K series SS1 (Megan3), 1400 CVH EFi SS1 (Grawpy), Sabre/MX5 auto (The Flying Broomstick),
1300 SS1 (Number One) & Sarah's coupe.
CURE THE FAULT - NOT THE SYMPTOMS

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Re: Overdrive inhibit switch. An alternative?

Post by simmit » Tue Dec 29, 2015 10:57 pm

scimjim wrote:Yes but fairly easy to modify the lever. Not sure what the basis of this excercise is - personally I just fitted a new switch :-)
I've been advised the orig. spec. new switch is no longer available. That may not be correct but as QRG and GW are closed for the Xmas break so I can't immediately check. Can you say if there is an orig. spec. switch available and from where?

This exercise for alternative switch is in case no orig. spec. is available or if v. expensive then perhaps find suitable cheaper.



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Re: Overdrive inhibit switch. An alternative?

Post by scimjim » Tue Dec 29, 2015 11:09 pm

original spec (remanufactured) is on the shelf at QRG - beware anyone saying bits aren't available until you've asked on here, there's usually someone who knows where bits can be sourced.


Jim King

Current: SE5 (8Ball), TI SS1 (snotty), 1600 SS1 (G97), 1600 SS1 (C686CCR), 2.5TD SE5a (diesel 5a), 6 x random other SS1s.
Previous: SE5, 3 x SE5a, 2 x SE6a, 3 x SE6b, GTC, 2.9i GTC, 3 x 1600 SS1, 1300 SS1, Mk1 Ti Sabre, Mk1.5 CVH Sabre
Chief mechanic for: 1400 K series SS1 (Megan3), 1400 CVH EFi SS1 (Grawpy), Sabre/MX5 auto (The Flying Broomstick),
1300 SS1 (Number One) & Sarah's coupe.
CURE THE FAULT - NOT THE SYMPTOMS

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Re: Overdrive inhibit switch. An alternative?

Post by Lukeyboy46 » Tue Dec 29, 2015 11:30 pm

We'd seen in a GW parts catalogue that they have been striked as NLA is all Jim when Alan popped over today! So that may be my fault! I'd never seem the switch in question before today myself. Everyday is a learning day!


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Re: Overdrive inhibit switch. An alternative?

Post by scimjim » Tue Dec 29, 2015 11:36 pm

ah - and what was the date on that parts catalogue? :-)


Jim King

Current: SE5 (8Ball), TI SS1 (snotty), 1600 SS1 (G97), 1600 SS1 (C686CCR), 2.5TD SE5a (diesel 5a), 6 x random other SS1s.
Previous: SE5, 3 x SE5a, 2 x SE6a, 3 x SE6b, GTC, 2.9i GTC, 3 x 1600 SS1, 1300 SS1, Mk1 Ti Sabre, Mk1.5 CVH Sabre
Chief mechanic for: 1400 K series SS1 (Megan3), 1400 CVH EFi SS1 (Grawpy), Sabre/MX5 auto (The Flying Broomstick),
1300 SS1 (Number One) & Sarah's coupe.
CURE THE FAULT - NOT THE SYMPTOMS

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Re: Overdrive inhibit switch. An alternative?

Post by Lukeyboy46 » Tue Dec 29, 2015 11:40 pm

I have no idea! Will look at that tomorrow! :p

Didn't think to check that bit!

As Alan said though, with both suppliers closed for the festive period there is limited information available ;) pleased they have Remanufactured them!


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Re: Overdrive inhibit switch. An alternative?

Post by simmit » Tue Dec 29, 2015 11:55 pm

scimjim wrote:Yes but fairly easy to modify the lever. Not sure what the basis of this excercise is - personally I just fitted a new switch :-)
The switch is fixed to a bracket which in turn is screwed to the top of the gearbox (a pig to get at) and on my car a relay (for switch wiring) is fixed to the same bracket. When you fitted your new switch did you notice same set-up?
I suspect the wiring on my car has been much played with over the years.



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Re: Overdrive inhibit switch. An alternative?

Post by scimjim » Wed Dec 30, 2015 12:05 am

no relay as standard - from inside the engine bay (air filter off) remove the wires from the switch, then the switch with the bracket (2 bolts)

are you sure it's the switch at fault?


Jim King

Current: SE5 (8Ball), TI SS1 (snotty), 1600 SS1 (G97), 1600 SS1 (C686CCR), 2.5TD SE5a (diesel 5a), 6 x random other SS1s.
Previous: SE5, 3 x SE5a, 2 x SE6a, 3 x SE6b, GTC, 2.9i GTC, 3 x 1600 SS1, 1300 SS1, Mk1 Ti Sabre, Mk1.5 CVH Sabre
Chief mechanic for: 1400 K series SS1 (Megan3), 1400 CVH EFi SS1 (Grawpy), Sabre/MX5 auto (The Flying Broomstick),
1300 SS1 (Number One) & Sarah's coupe.
CURE THE FAULT - NOT THE SYMPTOMS

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Re: Overdrive inhibit switch. An alternative?

Post by simmit » Wed Dec 30, 2015 12:34 am

scimjim wrote:no relay as standard - from inside the engine bay (air filter off) remove the wires from the switch, then the switch with the bracket (2 bolts)

are you sure it's the switch at fault?
There may be other problems but the switch is for certain as dead as a stuffed parrot. Further, having just three terminals it has only passing resemblance to the original which has, I believe, four.



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Re: Overdrive inhibit switch. An alternative?

Post by scimjim » Wed Dec 30, 2015 12:45 am

ah - pining for the Fjords :-)


Jim King

Current: SE5 (8Ball), TI SS1 (snotty), 1600 SS1 (G97), 1600 SS1 (C686CCR), 2.5TD SE5a (diesel 5a), 6 x random other SS1s.
Previous: SE5, 3 x SE5a, 2 x SE6a, 3 x SE6b, GTC, 2.9i GTC, 3 x 1600 SS1, 1300 SS1, Mk1 Ti Sabre, Mk1.5 CVH Sabre
Chief mechanic for: 1400 K series SS1 (Megan3), 1400 CVH EFi SS1 (Grawpy), Sabre/MX5 auto (The Flying Broomstick),
1300 SS1 (Number One) & Sarah's coupe.
CURE THE FAULT - NOT THE SYMPTOMS

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