Horn Problems 250GT

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John Vardanian
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Location: San Francisco Area

Horn Problems 250GT

Post by John Vardanian »

There is about a second delay from when the horn button is pushed to the time the horn actually sounds. Then it takes another second from the time the horn begins to sound to the time it barks at its fullest. In other words, the horn does not bark loud and instanteneously when the button is pushed.

Any advice? Thanks.

John Vardanian
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tyang
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Post by tyang »

Hi John,

I'd put a test light on the power lead to the horn, and see if it reacts as slowly to the push of the horn button. There is a relay that could be slow to react, but this would confirm the root of the problem. The pump may also be getting old and not generating enough air quickly enough to operate the reeds/diaphrams. The horns may also need a slight adjustment screwing them in or out slightly to match the amount of air needed to vibrate the reed. Do the adjustment with small increments.. It's very easy to get the horns all out out adjustment, while driving the neighbors crazy!

Tom
fest
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Joined: Mon Mar 03, 2003 10:59 pm

horn compressor oil

Post by fest »

I might add here
that the compressor
may need to be cleaned
and or oiled

this brings up a question
what is the proper oil
to use in the horn compressor
(FIAMM OIL obviously)
but
where do we get it
or what is a suitable
commercially available substitute
John Vardanian
Posts: 1906
Joined: Wed Sep 04, 2002 12:13 am
Location: San Francisco Area

Post by John Vardanian »

Thanks Fest. I believe your diagnosis might be correct.

Tom, what kind of oil should we use? Sounds like a question for monsieur Sicard.

john
fest
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Joined: Mon Mar 03, 2003 10:59 pm

horn compressor oil

Post by fest »

in the abscence of a professional opinon
I would probably obtain some
Sewing Machine Oil
and use that to lubricate the Horn Compressor
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tyang
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Post by tyang »

Hi Guys,

I'll ask Francois when I seen him next about the oil, but a light machine oil would also be my guess.

Tom
fest
Posts: 415
Joined: Mon Mar 03, 2003 10:59 pm

sewing machine oil

Post by fest »

hey tom

while you are at the upholster's
could you ask him what kind of sewing machine oil
he would recommend
and any sources for same?

(those upholstery sewing machines go for big buck$
so maintainence has got to be paramount)
John Vardanian
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Location: San Francisco Area

Post by John Vardanian »

I found the problem: overoiling. In fact one of the horns would not sound because it was full of oil.
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tyang
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Post by tyang »

Hi John,

Nope, I would have never guessed that one!

Tom
John Vardanian
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Joined: Wed Sep 04, 2002 12:13 am
Location: San Francisco Area

Post by John Vardanian »

One more thing since we are on the subject ... you can tune the sound by screwing the trumpet in or out of the base of the horn. There is a large locking nut that will need to be loosened first.
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