[Tigers] Temp Gauge Reading High?

[gharlowe at comcast.net]

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 <mailto:tigers-bounces at autox.team.net> > On Behalf Of gharlowe at comcast.net <mailto:gharlowe at comcast.net> 
Sent: Friday, July 10, 2020 3:58 PM
To: 'Tom Parker' <tkparker1941 at gmail.com <mailto:tkparker1941 at gmail.com> >
Cc: 'LIST TIGER' <tigers at autox.team.net <mailto: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 <mailto:tkparker1941 at gmail.com> > 
Sent: Friday, July 10, 2020 3:37 PM
To: Graham Harlowe <gharlowe at comcast.net <mailto:gharlowe at comcast.net> >
Cc: LIST TIGER <tigers at autox.team.net <mailto: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 <mailto: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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