Re: [tech] oil pressure switches

["David Ruby" <dbruby@ainet.com>]

Josiah,
Could it be possible that some moisture has found its way into/onto  the
buzzer relay?
Just a thought (from a simple-minded person).

-Dave
(Sometime Master of the Obvious)
86 8v
-----Original Message-----
From: Wm. Josiah Erikson <josiah@gsinet.net>
To: Scirocco List <scirocco-l@scirocco.org>
Date: Sonntag, 15. November 1998 07:07
Subject: [tech] oil pressure switches


>OK, my Bentley is pissing me off. It's contradicting itself again. But
>it's an old one, made in 1983. Maybe the new one doesn't have so many
>mistakes in it... Brian?
>Anyway, I'm dealing with an '84 Scirocco that has the following
>condition: The oil pressure warning light and buzzer stay on for much of
>the time. When the light goes on or off doesn't seem to have much to do
>with anything at all. So I figure I'd see if the oil pressure is good,
>and since I don't have an oil pressure guage, I figured I'd check
>whether the oil pressure switches were setting off the buzzer or whether
>it was something else, and if it was the switches, I'd replace the
>offending one with a used one I had around, and then if the condition
>still existed, conclude that the oil pressure was bad, or at least take
>it somewhere to have it tested.
>So I looked in the trusty Bentley, and it tells me two contradictory
>things:
>1. That the switch on the cylinder head is normally closed and that the
>switch on the oil filter bracket is normally open.
>2. If I disconnect the wire that goes to the switch on the oil filter
>bracket, the warning light should come on and a buzzer sound.
>
>Obviously, these two things are contradictory. If the switch on the oil
>filter bracket is normally open, then disconnecting the wire should make
>the light go out, if anything. So... what's right?
>
>And somebody could tell me what the switch ratings mean, like "a
>normally closed 2.1-6.4 psi switch". Does that mean that it's closed
>between those pressures? Seems odd, because I thought that our engines
>ran up at like 60psi oil pressure.
>
>Anyway, if somebody could enlighten me as to how these switches work,
>I'd be eternally grateful : )
>
>    TIA!
>    -Josiah
>
>
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