STV Rebuild/ Molykote Type Z

[Gino R.]

Hi All,
Finally back at it. Starting to rebuild my suction throttle valve and ran into a couple of questions/problems that I was hoping the you guys could help me with?

First of all I took apart the STV and I am a little concerned with the condition of the bore. It feels smooth when I put my finger in it....(passed the finger test), but there are definitely some dark areas and and some small imperfections. I have attached a couple of pictures. Let me know what you think.

Secondly, In the Service Manual on the rebuild they reference a powdered Molykote Type Z which seems to be quite expensive and hard to get, especially for just a small amount that I would need. Is there a substitute for that product? Or should I just bite the bullet?

Lastly should I take apart the Schrader valves apart for cleaning? I am concerned that there is dirt inside of them, but I don't want to damage them or cause them to leak when I start messing with them.

Thanks for the help
Gino 66 Coupe

[Harry S.]

Re: STV Rebuild/ Molykote Type Z

Gino, when I rebuilt the STV for my 63 10 years ago this is what I did.

• cleaned all parts inside and out with alcohol
• Used 12,000 grit water based sand paper so ensure all was smooth
• cleaned again with alcohol and blew it out with compressed air.
• Installed an NOS diaphragm (rubber and Metal)
• Re-assembled the unit

For me, it's been working fine sine the rebuild.

Good luck
Harry

[Gino R.]

Re: STV Rebuild/ Molykote Type Z

Thanks Harry for the advice,
I will be hoping for the same results. I appreciate the Help!!