Have a Model A horn with new gaskets and stainless diaphragm. Motor spins but no sound. What am I missing? Thanks.
Is it a real Model A horn or aftermarket? If it's a true Model A horn, there is a screw on what looks like a clamp on the back of the motor (it would stick thru the cover), this would need to be screwed in till it make the sound you like.
Warren. if you have no sound obviously the noise is missing!!!! Or you need new batteries in your hearing devices.
Allan from down under.
Mark, Model A horn. Diaphragm and gaskets are new Repo. Screw appears to do nothing , only motor turning. Allan, no horn sound. While failure of other things hearing is still good at least for today. I,ll try checking out again. Any reports of REPO horn diaphragm failures ?
google "Model A Ford horn adjustment"
Lots of info.
When everything else seems perfect sometimes you have to look for things that seem absolutely impossible Example: Any chance the diaphragm got reversed? The raised center would be visible through the bell.
Warren, does the diaphragm have a pointed rivet in the centre? The motor should have a sort of metal crown on the end that strikes that rivet when it turns, that's what makes the noise. The tension between crown and rivet can be adjusted with a screw on the back of the horn to fine tune the sound.
I have been out fooling with it. What pushes the armature closer to rivet. There appears to be gap between pointed rivet and crown that contacts when the crown is spinning. Beginning to wonder if armature is from another horn and is different or is it missing something that puts forward motion to crown part. Never owned a Model A.
some versions have a ball bearing (single ball only) on the commutator end of the shaft that the adjuster pushes against. If it's missing, then yes, you won't be able to adjust it enough for it to strike the diaphragm "rivet".
The rivet is not pointed it is wedge shaped. The wedge should be clocked to match the waffle patern in the wheel.