[DeTomaso] Temp Gauge Started Bouncing
jderyke at aol.com
jderyke at aol.com
Thu Oct 1 15:45:31 EDT 2020
With gauge senders that use a screw on ring connector, one of the most ignored is an installation problem. Such connectors are made such that if you simply stick on a ring connector and graunch down on the nut- especially after having loose connection woes, it's very easy to overtorque the nut in your zeal to avoid more such issues. What happens is, you literally pull the metal stud out of the plastic sender while tightening the small nut! The sender should first have a nut threaded on finger tight, then the ring connector, then a small split-washer, then a second nut.
The second nut should be wrench-tightened against the first nut that's held by a second wrench, not against the sender body. Doing this wrong is a fine way to cause your brand new sender to behave exactly like the old one- with an intermittent electrical connection inside it. An allied problem is using too much teflon tape on the sender's pipe threads into the block. Too many turns can electrically insulate the sender from the block instead of allowing electricity to ground thru the cast iron. ONE turn of tape will work fine; more can and has caused problems.
J DeRyke
-----Original Message-----
From: Forest Goodhart <forestg at att.net>
To: DeTomaso Forum <detomaso at server.detomasolist.com>; Joe Jaffoni <427390 at gmail.com>
Sent: Wed, Sep 30, 2020 2:34 pm
Subject: Re: [DeTomaso] Temp Gauge Started Bouncing
I would check the connection of the wire at the sender. This sounds
like a loose connection. If not there then check at the gauge.
On Wednesday, September 30, 2020, 02:27:34 PM PDT, Joe Jaffoni
<427390 at gmail.com> wrote:
1972, #3244 with stock veglia gauge, stock sending unit in block,
aluminum radiator w/two strong fans that are temp controlled
w/sensors
from Byars, flow kooler water pump w/the aluminum pulley upgrade.
Have driven about 600 miles since break in and getting it back on the
road and then drove 1.5 hours to a cars and coffee and the gauge read
fine at around 190 with the fans coming on and off depending on
whether
I was on the highway or local roads.
On the drive home, the temp gauge started bouncing from about the 200
degree mark andA mostly to the lower temp side of the gauge. Got
home
and the car was not overheated and I checked it at the block and
heads
with infrared thermometer.A A
Have others had this? Do I check wiring on gauge first? Sensor first?
Any ideas that will shorten the troubleshooting process would be
appreciated as I will have the car out this weekend and while it's
not
overheating, it's annoying to watch the needle bouncing around like
that. Thanks for the help/insights.
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-------------- next part --------------
With gauge senders that use a screw on ring connector, one of the most
ignored is an installation problem. Such connectors are made such that
if you simply stick on a ring connector and graunch down on the nut-
especially after having loose connection woes, it's very easy to
overtorque the nut in your zeal to avoid more such issues. What happens
is, you literally pull the metal stud out of the plastic sender while
tightening the small nut! The sender should first have a nut threaded
on finger tight, then the ring connector, then a small split-washer,
then a second nut.
The second nut should be wrench-tightened against the first nut that's
held by a second wrench, not against the sender body. Doing this wrong
is a fine way to cause your brand new sender to behave exactly like the
old one- with an intermittent electrical connection inside it. An
allied problem is using too much teflon tape on the sender's pipe
threads into the block. Too many turns can electrically insulate the
sender from the block instead of allowing electricity to ground thru
the cast iron. ONE turn of tape will work fine; more can and has caused
problems.
J DeRyke
-----Original Message-----
From: Forest Goodhart <forestg at att.net>
To: DeTomaso Forum <detomaso at server.detomasolist.com>; Joe Jaffoni
<427390 at gmail.com>
Sent: Wed, Sep 30, 2020 2:34 pm
Subject: Re: [DeTomaso] Temp Gauge Started Bouncing
I would check the connection of the wire at the sender. This sounds
like a loose connection. If not there then check at the gauge.
On Wednesday, September 30, 2020, 02:27:34 PM PDT, Joe Jaffoni
<[1]427390 at gmail.com> wrote:
1972, #3244 with stock veglia gauge, stock sending unit in block,
aluminum radiator w/two strong fans that are temp controlled
w/sensors
from Byars, flow kooler water pump w/the aluminum pulley upgrade.
Have driven about 600 miles since break in and getting it back on
the
road and then drove 1.5 hours to a cars and coffee and the gauge
read
fine at around 190 with the fans coming on and off depending on
whether
I was on the highway or local roads.
On the drive home, the temp gauge started bouncing from about the
200
degree mark andA mostly to the lower temp side of the gauge. Got
home
and the car was not overheated and I checked it at the block and
heads
with infrared thermometer.A A
Have others had this? Do I check wiring on gauge first? Sensor
first?
Any ideas that will shorten the troubleshooting process would be
appreciated as I will have the car out this weekend and while it's
not
overheating, it's annoying to watch the needle bouncing around like
that. Thanks for the help/insights.
_______________________________________________
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