The International Cessna 170 Association

This is a general question rather than 170-specific:

Can anyone tell me how to get the throttle, carb heat etc. controls out of the panel without wrecking them? I got the primer out and the mixture control. The engine-side attachments on the rest are all too large to go through the firewall. Do they have to come off or is there a way to detatch the knob and feed them back from the cabin side?

All help appreciated!

Gareth.

For anyone that happens across this in a search, I figured it out (at least it worked for me):

1. Remove everything engine-side so the wire can slide up the inside of the sheath and out.
2. Release the control front and back of the panel
3. Pull the control into the cabin catching the rear retaining nut and any washers as they try to fall into the open inspection holes!

Exception:
On mine the carb heat had a spring loaded control with a ball bearing in it. You release the knurled nut, compress the spring to release the knob and and GENTLY pull the control out of the sheath. CATCH THE BALL BEARING. (I didn't and now have to source a replacement). Then pull the control wires out of the sheaths into the cabin through the panel.

The Stock throttle cable end is a threaded piece that is unscrewed from the cable. That will leave you with no obstructions to coming through the firewall. You need to remove the grommet from the firewall and it should pull through. The Grommet is a tight friction fit. Put a new one in with a new cable or putting the old cable back in.

Mixture should not be a problem, it is just the end of the cable and the internal wire. Easy to back through he firewall into the cabin.

Carb heat on mine was also just the cable end once I unclamped it from the lever arm and it came out easily, although the fitting in the firewall needed to be manipulated a bit as it is meant to hold the cable from slipping.

I've not done the primer or tach cable yet so no experience with those.

Gareth,
Don’t reinstall the cables in the holes they were in. Check out Fig. 17 and Fig. 34 of the ‘48 IPC. I haven’t compared cable routing of the ‘48 with the later models but the way your cables were routed doesn’t match the IPC at all. Maybe someone with a ‘48 could post a couple of pictures of their firewall?