Does anyone have a detailed description or drawing of the assembly order for the 280Z horns? I would like to completely disassemble, clean, and repaint them.

Here is a picture of mine dis-assimbled. Not too complicated. Mine had a paper ring between the two rings, it was pretty much gone, I did not worry about replacing it. the work fine.

Did you make some notes about the washers on the diaphragm? I didn't see the metal block in your photo. Mine has a metal block on the back of the diaphragm, and some washers of different thicknesses.

It wasn't easy getting the diaphragm cleaned up!

Mine has a different attachment arm. It's just a rectangular strip with one hole on each end. I was also going to use some RTV stuff in place of the paper gasket.

I wonder what that little Phillips-head screw by the mounting stud does.

Edited June 27, 201213 yr by TomoHawk

The "little Phillips-head screw" is an adjustment. Set it for best tone and/or loudest sound.

The book says the nut in the center is to adjust the pitch.

Which book? The factory manuals for the 280Z do not mention any adjustments. The manual for the '73 240Z provide instructions for adjusting the volume using the little screw. Set the screw so the horn draws 3 amps with 12.5 volts applied to the horn.

Tomo, the inside parts I took out and kept them together and did nothing to them and then replaced them the way they came out. I did not replace the paper gasket. The screw I did nothing to except to plate it with the other screws and plots and nuts.

I ended up buying new horns to get that European/Italian sound. My car sounds less like an old Mercury now