Heater stepper motor refitting help

[Technoholic]

Hi all

I have a faulty stepper motor which I have removed and have found that the teeth seemed stripped so definitely needed replacing. Also the heater flap was stuck closed so that’s fixed now too. However when refitting the new stepper motor, do I need to make sure the spindle is in a certain position before I reattach the flap arm? If so how do I do that?

Also my old motor had different wire colours to the new one so I guess I need to find a wiring diagram to swap the plug over.

Finally the old motor is attached to its bracket with rivers. Can I just screw the new motor to the bracket with small machine screws instead?

Thanks very much

[pac1uk]

Hi,
I changed mine a few years ago. This is the Powers Stepper motor wiring :-

Pin 1 Orange – old BLUE
Pin 2 Yellow – old RED
Pin 3 Black – old BLACK
Pin 4 Green – old WHITE
Pin 5 Brown – old GREEN
Pin 6 Red – old WHITE

[Technoholic]

Thanks, I’ve bought a new stepper motor off someone who didn’t need it in the end and I haven’t received it yet but I believe it’s a TVR parts one, and the wiring seems different according to their website, compared to what you’ve written. Also did you just cut the wires and solder the old plug on to the new motor?

Do you also have any advice on the other points? Specifically about resetting the motor position?

[nawarne]

Hi,
Yes, you can drill the rivets and attach the stepper to the mounting plate with M3/M4 (?) machine screws and nylocks.

Once you have sorted the wiring (IIRC, I removed old multi-pin plug from old motor and soldered on to the new - wires were same colour), connect with the plug and cycle using the temp controller in the cabin from cold to hot a few times. this should 'normalise' position.
With the control set to 'cold', attach crank from flap to motor spindle - - ensuring flap is covering the aperture from the 'HOT' box/exchanger/heating radiator.

IIRC, there is a flat on motor spindle to locate grub screw on flap linkage

Nick

[Technoholic]

That’s great hopefully the flat will line up in the correct position when I let it normalise. The wiring is different on mine, old colours I guess from the original motor but it seems there are different wiring schemes depending on where you get the new motor from. I’ll have to figure it out when it arrives.

[Penelope Stopit]

This is interesting and contains information https://www.pistonheads.com/gassing/topic.asp?t=16...

[Technoholic]

Yeah I’ve read that but he had a problem with the motor over rotating which I don’t think I have, but it’s been useful to get information about the insides of that area.

[pac1uk]

I cut the old plug off with tails so I could solder on new motor wiring.

I did it a few years ago and can't remember all the exact details, I think its just getting the arm to the heater flap in correct position so it can go from fully closed to fully open.

[Technoholic]

I don’t think it will be too hard. I just don’t want to get it in the wrong place first and then have it try to rotate the wrong way or something and strip the teeth again. I just opened up my old one and the gears are completely stripped in multiple places. My heater flap was also stuck shut so that probably didn’t help with putting extra strain on the motor.

I have some pin removal tools so I’m planning to remove the pins and solder them on to the new wires and reassemble. If that doesn’t work then I’ll just do as you did and cut with some tails and solder together and heat shrink the lot

[Technoholic]

I got a new stepper motor today off someone on Facebook. It's the right motor as the box is TVR and has the right part code on it, but the wiring is different to any I've seen. It has Black, Red, Green, Green, Yellow, Yellow/Black. Anyone have any idea of the pin reference for this motor?!

Thanks