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07-06-2012, 01:55 PM
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CC Member
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Join Date: Apr 2004
Location: Scotts Valley,
CA
Cobra Make, Engine: ERA 289 FIA #2108
Posts: 1,882
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Not Ranked
Water temp: 140F; Oil temp: 180F
My water temperature is running at a low 140F, and the oil temp is also reading a bit low at 180F. I noticed this last week, and yesterday I replaced the thermostat, but the odd temperature readaings persist. I popped the hood and felt the heat coming off the engine and it seems quite hot to me.
Any ideas of what may be going wrong here? I hadn't changed anything when I noticed the issue. I did change out the thermostat, rerouted the hose to my Harrison tank, and installed a new water neck while I had the fluid out.
I burped the cooling system from the water neck, but the highest point on the cooling system is at the radiator, not the water neck. I'm wondering if it is not completely burped.
Any ideas?
DD
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Dangerous Doug
"You're kidding, right?"
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07-06-2012, 02:28 PM
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Senior Club Cobra Member
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Join Date: May 2001
Location: Florence,
AL
Cobra Make, Engine: RCR GT 40 & 1966 Fairlane 390 5 speed
Posts: 4,511
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Not Ranked
Doug, do you have a thermometers? Wife's meat thermometers would work if it goes to 200 plus. Press it against the hose or touch the water outlet.
I use a infrared digital laser pyrometer. Great tool to have when working on a Cobra. No guessing about the temp of the oil, water, block, radiator, headers, etc.
The gauge read low on my oil temp till I moved the sensor to the remotor oil filter.
Dwight
Search Results for laser thermometer - SummitRacing.com
__________________
''Life's tough.....it's even tougher if you're stupid.'' ~ John Wayne
"Happiness Is A Belt-Fed Weapon"
life's goal should be; "to be smarter than inanimate objects"
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07-06-2012, 02:28 PM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 22,001
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Not Ranked
If I put a pot of water out in my front yard it's going to be hotter than 140 degrees. Get an infra-red thermo gun at the local hardware store and take a couple of readings on your upper radiator hose and other points and see what it says. Maybe you just have a bad gauge.
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07-06-2012, 02:44 PM
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CC Member
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Join Date: Jan 2009
Location: Jonesboro,
AR
Cobra Make, Engine: Backdraft 874 solid red Roush 427 small block 515 hp
Posts: 572
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Not Ranked
We always tested thermostats on stove with pot of hot water and meat thermometer.
Crude but effective.
__________________
There were no atheists in the foxholes.
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07-06-2012, 02:52 PM
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CC Member
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Join Date: May 2001
Location: California,
Ca
Cobra Make, Engine: NAF 289 Slabside Early Comp Car with 289 Webers and all the goodies. Cancelling the efforts of several Priuses
Posts: 6,592
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Not Ranked
Maybe your water temp gauge conked out?
__________________
Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way
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07-06-2012, 04:00 PM
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CC Member
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Join Date: Apr 2004
Location: Scotts Valley,
CA
Cobra Make, Engine: ERA 289 FIA #2108
Posts: 1,882
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Not Ranked
I don't think the guage has conked out, as the oil temp is running a tad low as well---even though the engine and coolant lines seem quite hot. I'll mess with it again this weekend. The only things I can think of as a source is the thermostat, or that it's not yet properly burped.
Anyone have air pockets in their cooling system? What are the symptoms?
DD
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Dangerous Doug
"You're kidding, right?"
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07-06-2012, 04:06 PM
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CC Member
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Join Date: Nov 2003
Location: New Britain,
CT
Cobra Make, Engine: Size 10 Feet
Posts: 3,011
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Not Ranked
The oil temp seems pretty "normal" for non-racing conditions, but the water temperature is pretty low if you're running the recommended 175F thermostat. Pull the bulb out of the intake and test it in some boiling water.
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07-06-2012, 06:04 PM
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CC Member
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Join Date: May 2001
Location: California,
Ca
Cobra Make, Engine: NAF 289 Slabside Early Comp Car with 289 Webers and all the goodies. Cancelling the efforts of several Priuses
Posts: 6,592
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Not Ranked
Did you change the type of coolant being used such as 100% water in lieu of coolant/water mix or has Water Wetter been added?
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way
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07-06-2012, 06:20 PM
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CC Member
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Join Date: Feb 2006
Location: Thousand Oaks,
CA
Cobra Make, Engine: Classic Roadster
Posts: 1,367
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Not Ranked
Is it possible you have electronic gauges? You didn't mention that in your post. If so it could be an electric issue??
John
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07-06-2012, 06:40 PM
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CC Member
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Join Date: Aug 2007
Location: Carlsbad,
Ca
Cobra Make, Engine: SPF 2932 with 438 Lykins Motorsports engine. Previous owner of FFR 5452.
Posts: 2,616
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Not Ranked
Test the temp sending unit in boiling water on the stove.
Ten to one, it's time to replace the gauge or sending unit.
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Jim
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07-06-2012, 06:45 PM
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CC Member
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Join Date: Jan 2008
Location: Williamsport,
PA
Cobra Make, Engine: Kellison Stallion 468 FE
Posts: 2,703
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Not Ranked
maybe wrong t-stat, or it slipped down if there isn't a slight counterbore in the new water neck to hold it in place...it'll run at exactly 140 cruising and creep up to 160ish at idle,,,,,
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Fred B
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07-06-2012, 07:22 PM
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CC Member
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Join Date: Sep 2009
Location: Camarillo,
CA
Cobra Make, Engine: SPF #2608, Roush 427SR T-W
Posts: 911
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Not Ranked
I used a fail-safe thermostat once and found it to fail open when my coolant got to about 190 F. With the thermostat failed open, the water temps stayed down in the 150 F range until the thermostat was replaced. I decided I didn't want a fail-safe thermostat even though the warranty would give me a free new one!
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07-06-2012, 10:02 PM
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CC Member
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Join Date: Mar 2006
Location: San Marcos california,
CA
Cobra Make, Engine: 1989 KCC from South Africa Right Hand Drive
Posts: 1,601
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Not Ranked
Have you checked the charge coming out of the alternator?
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07-06-2012, 11:21 PM
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CC Member
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Join Date: Apr 2004
Location: Scotts Valley,
CA
Cobra Make, Engine: ERA 289 FIA #2108
Posts: 1,882
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Not Ranked
Nope on the 100% vs. 50/50. I always use 50/50 out of the bottle because I can never get the ratio correct while filling.
Well, I pulled the water neck off this evening as well as the thermostat. Nothing seemed amiss there. I'll test the guage sender unit with a pot of boiling water (should read 212F here at sea level) to see if that is the issue. Might as well replace the thermostat, but test it for opening with that same pot of water before I install it.
In the past (yeah, like 20 years ago...) I've installed a new thermostat only to find it isn't working correctly. Good idea to toss it into boiling water to make sure it opens.
The only thing I hate working with more than antifreeze is brake fluid! Yuck!
DD
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Dangerous Doug
"You're kidding, right?"
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07-07-2012, 09:15 AM
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CC Member
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Join Date: Jan 2008
Location: Williamsport,
PA
Cobra Make, Engine: Kellison Stallion 468 FE
Posts: 2,703
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Not Ranked
i put one of these on my intake to bleed out air.....it is so sweet i wish i had one 20 years ago. you just push the plunger with your finger and the air escapes......sold by morosso....
you can see it there next to the distributor
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Fred B
Last edited by FWB; 07-07-2012 at 09:21 AM..
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07-07-2012, 09:46 AM
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CC Member
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Join Date: Apr 2004
Location: Scotts Valley,
CA
Cobra Make, Engine: ERA 289 FIA #2108
Posts: 1,882
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Not Ranked
Quote:
Originally Posted by FWB
i put one of these on my intake to bleed out air.....it is so sweet i wish i had one 20 years ago. you just push the plunger with your finger and the air escapes......sold by morosso....
you can see it there next to the distributor
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Awesome! I'll sleuth around on Summit Racing to see if I can find one there. No doubt "cooling system air bleed" or something like that. Great tip!
DD
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Dangerous Doug
"You're kidding, right?"
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07-07-2012, 10:12 PM
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CC Member
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Join Date: Apr 2004
Location: Scotts Valley,
CA
Cobra Make, Engine: ERA 289 FIA #2108
Posts: 1,882
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Not Ranked
And the prize goes to.... PatrickT for being the first to call out the water temp gauge. I put it in a hot pot of water and it went up to 120F briefly, then down to 100F. After that, it was just dead. Just for peace of mind I tested the thermostat and it opened right up.
Good grief. I should have started with the gauge, though I did take the opportunity to change out the water neck to an aluminum one with a port, and reroute the hose from my water pump to my Harrison tank. But, given the opportunity to NOT do all that AND not smell like antifreeze, well...like I said, I should have started by testing the gauge.
Well, Bob, what is the standard coolant temperature gauge that comes with the ERA 289 FIA? Is there an electrical guage that has the same look (bezel, face, and sweep)?
I'll be picking up a couple of air bleeders (one for the Cobra, and one for the KC 331 I'm building in my garage---SummitRacing has them), and a new coolant temp guage.
DD
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Dangerous Doug
"You're kidding, right?"
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07-08-2012, 06:09 AM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 22,001
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Not Ranked
Quote:
Originally Posted by Dangerous Doug
And the prize goes to.... PatrickT for being the first to call out the water temp gauge.
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Unfortunately, the prize is an autographed cheesecake photo of Rick Lake.
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07-08-2012, 08:40 AM
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CC Member
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Join Date: Jan 2008
Location: Williamsport,
PA
Cobra Make, Engine: Kellison Stallion 468 FE
Posts: 2,703
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Not Ranked
i think the prize is getting it fixed......
__________________
Fred B
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07-08-2012, 10:31 PM
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CC Member
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Join Date: Apr 2004
Location: Scotts Valley,
CA
Cobra Make, Engine: ERA 289 FIA #2108
Posts: 1,882
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Not Ranked
Quote:
Originally Posted by patrickt
Unfortunately, the prize is an autographed cheesecake photo of Rick Lake.
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I'll buy you a beer.
Could have been worse: if this had been a 70's game show you'd be the proud owner of a Ford Pinto...
DD
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Dangerous Doug
"You're kidding, right?"
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