[Tigers] Temp Gauge Reading High?

Fri Jul 10 20:07:31 MDT 2020

Both IR thermometers that I have seem to work best when pointed at a black
surface.  I did an experiment where I painted a spot on a copper hot water
pipe black.  With the water flowing there was a noticeable difference
between the temperature of the black spot, and the shiny copper pipe about
an inch away, with the copper reading being lower.

So if you are comparing temperatures, be sure both spots are black, or at
least the same color.

 Also, despite the red dot one of my IR thermometers projects, the field of
view of the IR sensor appears to be actually much wider.  Of course, mine
were rather cheap($xx), compared to a pricey narrow angle Omega piece
($xxx).

Stu

On Fri, Jul 10, 2020 at 5:31 PM <gharlowe at comcast.net> wrote:

>
>
> Thanks to Ron and others for the recommendations.   Joe Parlanti
> recommended checking the voltage stabilizer…I hadn’t really observed
> significant fuel gauge problems, so I didn’t think that was the problem.
> Out of frustration, I checked under the dash and noticed the sheet metal
> mounting screw for the stabilizer was loose.   I disconnected the battery
> (a fried wiring harness taught me THAT lesson!), tightened up the mounting
> screw, and after restarting, the engine temps dropped about 30 degrees at
> the gauge.   I should package and sell that magic screw driver!
>
>
>
> Seems to be working well now and running between 175 and 195…Thanks again
> to all,  - G.
>
>
>
>
>
>
>
> *From:* Ron Fraser <rfraser at bluefrog.com>
> *Sent:* Friday, July 10, 2020 5:07 PM
> *To:* gharlowe at comcast.net
> *Cc:* 'LIST TIGER' <tigers at autox.team.net>
> *Subject:* RE: [Tigers] Temp Gauge Reading High?
>
>
>
> Graham
>
>                 One adage to follow is – if it’s not puking coolant, it’s
> not overheating.
>
>
>
> You should always double check the temp of the engine to the gauge with an
> IR thermometer or other means – most gauges are off some.
>
> Seems to me I read an article about someone putting a potentiometer or a
> small resistor in line with the temp gauge to make it read correctly.
>
>
>
> You might want to do a system flush.  Make sure you read the Flush bottle
> directions completely for this.
>
> I used Prestone Flush on my 1988 Mustang recently which stated for HD
> flush run the engine for 3 hours or more which I did by driving a couple
> hundred miles over 3 days.
>
>
>
> On my Tiger I put an overflow bottle just in front of the header tank.
> It will keep the coolant with your Tiger and not splashing on your front
> tire.
>
>
>
> I also recommend that you flush and back flush the heater core.  The last
> time I did that all kinds of sediment came out.
>
> I need to do that again this year.
>
>
>
> Ron Fraser
>
>
>
> *From:* Tigers <tigers-bounces at autox.team.net> *On Behalf Of *
> gharlowe at comcast.net
> *Sent:* Friday, July 10, 2020 3:58 PM
> *To:* 'Tom Parker' <tkparker1941 at gmail.com>
> *Cc:* 'LIST TIGER' <tigers at autox.team.net>
> *Subject:* Re: [Tigers] Temp Gauge Reading High?
>
>
>
>
>
>
>
> I should also add that in the interest of cooling, the horn holes are
> blocked off, I have a thermo-switched pusher fan, undersized fan pulley,
> aftermarket Derale fan, and an aluminum radiator from Dale A.   I’m very
> familiar with the articles and tech tips available to keep a Tiger cool
> that our great community has made available.    – G.
>
>
>
>
>
>
>
>
>
> *From:* Tom Parker <tkparker1941 at gmail.com>
> *Sent:* Friday, July 10, 2020 3:37 PM
> *To:* Graham Harlowe <gharlowe at comcast.net>
> *Cc:* LIST TIGER <tigers at autox.team.net>
> *Subject:* Re: [Tigers] Temp Gauge Reading High?
>
>
>
> Graham, Is this a new problem or has it always been like that?
>
>
>
> Tom Parker - tkparker1941 at gmail..
>
>
>
> On Fri, Jul 10, 2020 at 3:03 PM gharlowe--- via Tigers <
> tigers at autox.team.net> wrote:
>
> Listers –
>
>
>
> I’ve been troubleshooting what I thought was a hot-running motor.   It’s
> mid-summer in the mid-Atlantic, and I have a triple-black Tiger, so not the
> ideal scenario to run cool.   The car’s been running between 210 and 220 at
> 50 mph on level roads.  It doesn’t get a lot of miles, so I thought the
> radiator might need a flush.  I changed the thermostat (180deg) at the same
> time.   Same temps.  I pulled out an infrared thermometer and with the car
> idling, the temp gauge was indicating ~ 215 while the infrared thermometer
> was reading 183 when pointed at the water outlet and F4B manifold.   I
> ordered a new temp sending unit from Rick – any other suggestions?
>
>
>
> Thanks as always,
>
>
>
> Graham Harlowe
>
> B382001466
>
>
>
>
>
>
>
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>
>
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