I'm a bit puzzled by this. My 1954 +4 (TR2) has a bulb-type gauge which is
I presume filled with a fluid/gas which pressurises to move the needle. BUT
the bulb is screwed into a hole in the back corner of the cylinder head.
Any thoughts on whether this is original? It certainly looks fairly old.
Gary Arcus
Perth Western Australia
> -----Original Message-----
> From: owner-morgans@autox.team.net
> [mailto:owner-morgans@autox.team.net]On Behalf Of Bob Nogueira
> Sent: Tuesday, 24 August 1999 11:41
> To: DGreimel@aol.com; Marquis, Gary; aMORGANS@autox.team.net
> Subject: Re:Tech Temp gauge
>
>
> -- [ From: Bob Nogueira * EMC.Ver #3.1a ] --
>
> The Plus four gauge is somewhat unique in that when off, the
> needle sits on
> HOT and once tuned on moves to Cold. ( see below for the reason ) So if
> the needle is not moving at all try just grounding wire to the sending
> unit for a few seconds and see if the needle moves if not the gauge is the
> problem, if it does move the sender is the problem.
> Note Check: to see if your radiator is grounded . If you are using the
> mounts that look like mini motor mounts and you don't have the rods from
> the radiator to the tool box then there's no ground to the radiator
>
> The resistance value won't help. Inside the sending unit is a bimetallic
> bar wrapped in nichrome wire and the end of the bimetallic bar is a set of
> contact points.
> When the current is turned on the gauge needle moves because it too is
> attached to a bimetallic bar rapped in nichrome wire .As the wire heats up
> the bar bends moving the needle. Since the ground is the sending unit, as
> the needle is moving the bimetallic bar in the sending unit
> also heats up
> until the bar opens the contact points on the end and there is no
> ground so
> both bars start cooling until the sending unit bar again closes the points
> and the current starts flowing again.
> Or Simply put the sending unit is a on off switch and the
> longer its off
> the hotter the gauge reads.
>
> Bob Nogueira
>
>
> -------- REPLY, Original message follows --------
>
> > Date: Monday, 23-Aug-99 06:04 PM
> >
> > From: DGreimel@aol.com \ America Online: (DGREIMEL)
> > To: Marquis, Gary \ Internet: (gmarquis@csuchico.edu)
> > To: MORGANS \ Internet: (morgans@autox.team.net)
> >
> > Subject: Re: Temp gauge
> >
> > You can certainly test the sending unit with an ohm meter, if
> only you can
> get
> > the specifications that tell you what the resistance value should be a
> various
> > temperatures. If you find that out, please share with me. I
> don`t know
> if
> > mine is any good either although I am sure the gauge unit is bad. Good
> Luck!
> > Don
>
> -------- REPLY, End of original message --------
>
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