The voltage stabilizer also would affect other gauges.
So check, if these are working as expected.
If other gauges are not working properly, the stabilizer maybe faulty.
Before replacing this instrument, it is important to check, is the
stabilizer is making a good ground contact with its housing.
After so many years there may well be some dirt and corrosion between the
firewall and the stabilizer, which obstructs the effective working of the
stabilizer. The ground contact of the stabilizer is essential for the entire
electrical cicuit.
If the temp gauge is the only which shows unexpected readings, the gauge or
sender maybe faulty.
The sender is the easiest part to fix, though can be hard to remove from the
engine block.
I had to really stand with my full weight on the wrench, before the sender
came lose.
You also may try to find tables, which show electical values measured at the
sender against certain temperatures.
Measure this at the sender and see what the readings are.
It also might be, that the gauge should be readjusted. This only should be
done, if you never have had good gauge readings. Readjustment is possible
with two screws accessable via the rear of the gauge.
Two cork caps are normally filling the access hole for this adjustment.
Cheers,
Hans
2 weeks after a weeks vacation in England with the 71 BGT.
Was a great event - met Paul Hunt at the Heritage Museum @ Gaydon.
----- Original Message -----
From: "Councill, David" <dcouncill@msubillings.edu>
To: "'Matthew Milkevitch'" <mmilkevitch@yahoo.com>; <mgs@autox.team.net>
Sent: Friday, July 29, 2011 5:07 PM
Subject: Re: [Mgs] Temp Gauge Reading High
> There is also the voltage stabilizer - if not properly grounded or not
> working
> right, it will cause the temp gauge to run high. However, the fuel gauge
> would
> also be similarly affected if this is the case.
>
> David Councill
> 64 B
> 67 BGT
> 72 B
>
> -----Original Message-----
> From: mgs-bounces@autox.team.net [mailto:mgs-bounces@autox.team.net] On
> Behalf
> Of Matthew Milkevitch
> Sent: Friday, July 29, 2011 8:36 AM
> To: mgs@autox.team.net
> Subject: [Mgs] Temp Gauge Reading High
>
> Hello Listers;
>
> A recent post discussed the issue of overheating, and this "jogged" my
> memory
> about a particular issue my '74 MGB-GT is having. The temp gauge
> consistently
> reads high. At normal running the needle is just below the "hot" region.
> I've looked into this and the car is not overheating. I've measured the
> temperature of the coolant and it doesn't rise above 180 F.
>
> I've tried a different gauge and it still does this. Also, I replaced the
> sender unit and this doesn't help the problem either.
>
> Any ideas? My guess it must be in the wiring somewhere....???
>
> Thanks,
> Matt Milkevitch
> '74 MGB-GT
> Willow Grove, PA
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