Throttle valve R&R, 1.7 liter et al Options

[r3dplanet]

So I decided to pull the throttle body (valve) from my car in order to rebuild it. The throttle valve had a tendency to leak and stick. It was also moderately dirty. At the time I was on a personal mission to pull and restore every major component of the D-Jet system. Since then, I've performed similar operations on the MPS, AAR, etc. Perhaps I'll document those operations in a similar way.

My car is a 1971, but the engine is a 1973. I know that other engines use a top-mounted throttle valve, but it's actually quite similar to the side-mounted units like mine.

I realize that this isn't superorbital propulsion engineering, but it might be helpful to somebody.

Here's the original setup. You can clearly see the part number 022 133 067 under the muck, along with various scratches and nasties.







In this photo you can see that there's quite a gap around the brass air valve and inner diameter of the main bore. It seals if the valve is fully closed, but even the smallest relief of the lever allows air to pass.

[Dave_Darling]

I realize that this isn't superorbital propulsion engineering,...

I love that quote! (IMG:style_emoticons/default/smile.gif)

Mike Cooley used to offer a similar service years ago. He was using a lathe, I think, to get everything to fit well.

How would you deal with a throttle shaft that was worn? Or do you think that the shaft won't wear because it's riding on softer aluminum?

--DD

[r3dplanet]

I love it, too. It comes from a client of mine that was a retired NASA engineer. He had exactly one joke to his name. One only. I quote, "I might be a superorbital propulsion engineer, but I'm not rocket scientist! HA!" He told me that joke a dozen times.

To answer your question, the throttle shaft wasn't worn because it's made of steel. It might actually wear down a tiny bit and that could be a problem. I see that Zonedoubt was lucky enough to have a (1.8 liter) throttle valve that could use rubber seals. We're not as lucky with the 1.7. It could be potentially helpful to buy a bronze bushing with the same outer diameter but a smaller inner diameter then ream it a whisker at a time until the shaft fits. That's not very scientific, but it's all I can think to do beyond just using a better donor part.

-m.

I realize that this isn't superorbital propulsion engineering,...

I love that quote! (IMG:style_emoticons/default/smile.gif)

Mike Cooley used to offer a similar service years ago. He was using a lathe, I think, to get everything to fit well.

How would you deal with a throttle shaft that was worn? Or do you think that the shaft won't wear because it's riding on softer aluminum?

--DD