Heater servo & micro switches

[BARRETI]

I took the heater hot/cold servo motor off my '92 Griff last night and found a couple of problems I need your help with because there's not enough detail in the bible.

1. one of the micro switches is in bits, and the other doesn't look too healthy so I need 2. Does anyone know where to get these?

2. The motor shaft has a circular ring over it with a bolt screwed into it. I think the bolt is the thing that hits the micro switches to stop the motor and is adjustable by unscrewing it and swivelling it around the shaft (oh err missus !)
Before I took it apart I also guessed the black bar attached to the ali rod which drives the opening and closing of the valve also went on the end of the motor shaft and had somehow sheared because there was a bit of steel still in the end with a hold in, held in place by a grub screw with allen key head. The trouble is, the end of the drive shaft and the bit of steel in the black bar are nothing like each other. The shaft has a flat edge but the bit in the bar is completely round.

Can someone explain how the bits all fit together, and if the motor drive shaft really has sheared do you know where I can get another motor?

I can post photos if it would help someone visualise all this !!

Thanks, Ian

[IPAddis]

I've tried to get hold of the microswitches from Maplin but they are the wrong size. David Beer kindly sent me some but they were the wrong size as well.

TVR won't sell just the parts, only the entire mechanism at around 50 quid.

Ian A.

[BARRETI]

Well boo to TVR eh!

I've figured out how all the bits go together - the circular ring with the bolt screwed into it shouldn't be just a circular ring after all. The bit of steel I couldn't figure out should be attached to it!
It looks like the hole in the ring had been drilled very deep (am I finally reaching my lifetime ambition to be a dirty old man or does this sound disgusting to you too?) and the failure of the microswitch caused pressure on the this bit, shearing it off.
A bit of spot welding by my bruv Dave (ta D.) and its better than new.

Now for those micro switches ....

>> Edited by BARRETI on Thursday 30th September 21:07

[david beer]

I sent Ian the variable resistors,wrong type i know. I can certainly take a look for the micro switches. Do you have a picture with an idea of sizes.

[BARRETI]

Hi again,

I've got a couple of pictures - some not so good so bear with me.

This shows the entire unit. You can see the bottom micro switch is damaged and has both side (-ve) terminals missing.
[url]http://photos.fotango.com/p/eba00460789f00000005.jpg[/url]

This one shows the fix we made today with the bit of steel welded back on to the 'ring'
[url] http://photos.fotango.com/p/eba00460789f00000006.jpg [/url]

Both micro switches are the same - just one is flipped the other way up. This is a pretty crap close up but it's the best I can do.
[url]http://photos.fotango.com/p/eba00460789f00000010.jpg[/url]

Even if I could read most of the symbols in the top right I couldn't translate them into keyboard letters but in the bottom left it says
16(6)A 250V
which I think is the important bit.

I also found this on the Maplin site - do you think it will do the job?
[url]www.maplin.co.uk/media/largeimages/6453i2.jpg[/url]

Thanks muchly
Ian

>> Edited by BARRETI on Friday 1st October 08:53

[BARRETI]

Sorry, should have added the spec for that Maplin bit:

Contact rating: 15A 250Vac
Body size: 27·8 x 15·9 x 10·3mm
Fixing centres: 22·2 x 10·3mm
Fixing hole: 3·1mm diameter

using a ruler, my micro switch measures 28x16x10mm

Ian

[david beer]

The switch rating is not important, its only a matter of milli amps. I can certainly get direct repalcments, email me as its probably considered advertising !

[BARRETI]

I bought a pair of switches yesterday from Maplin and they do the job perfectly. Same physical size, same hole placement, everything identical except they are 12A rather than 16A but as David says, this makes no difference.

I've tested them this morning and they work great. Just waiting for the by rain to go away so I can get back out there and finish the job!

MAPLIN ITEM: Std-Microsw/Roller GW73Q
Barcode ref. 5 026686 478730.

I have a picture if anyone is interested.

[BARRETI]

Wey Hey, I've fixed it and I now have hot and cold air on demand!
I also installed the permanent connection for my Accumate whilst I had my head down there so a pretty good job all round.

Chuffed.
Ian