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overheating spitfire

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leslandon Silver Member Les Landon
Baton Rouge, LA, USA   USA
My 76 Spit (Basil) has an electric fan that works, and an accurate (?) temp gauge. The gauge never shows that it's overheating, but after a drive, the overflow bottle spews and steams. Any clues as to what's going on?
Thanks!

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grubscrew Avatar
grubscrew grub screw
The suburbs of, Winfield, Maryland, USA   USA
Some possibilities:
1. Overflow bottle might be too full. When cold, put only enough coolant in the bottle to cover the dip tube by about an inch or so.
2. Radiator cap pressure rating may be too low.
3. Your temperature gauge may be lying and you really are overheating.....

...others will chime in....



Dave
1970 Spitfire Mk3
FDU 78359L
34/11 (Jasmine yellow/Black interior)

1962 Triumph TR3B
TCF 575L
Signal Red/Red interior

clshore Carter Shore
Beverly Hills, FL, USA   USA
How do you know the temp gage is accurate?

Buy a cheap IR temp gun (Harbor Freight, etc.).
Calibrate readings by checking boiling water, and some ice.
Check temp readings of upper & lower hoses, radiator header, thermostat housing.

How's the coolant?

Drain & flush the system, add fresh coolant.

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lef2wander Avatar
lef2wander Gold Member James Thomas
Hatfield, MA, USA   USA
Cap wrong or just plain shot. Yup.
Overflow bottle to full. Yup.
Guage reads ok, who cares if it is reading ok when it spews it's useless .

Cycling back to the electric fanl led
indicator thread.

How old is the radiator? Did the cat sit for a decade or so with fluid in it. (Turns acidic) Take good look inside it are the runners that you can see covered. After 40 years no matter how well it was taken care of it could be bad.
(Tap water)

Thermostat how old. Partially frozen shut with age.

Are all the engine and and radiator cowlings still there.

Ok simply put you gonna have to do some investigating.

Lizzard d id
san jose, CA, USA   USA
I'd try a good mixture of new antifreeze if the old has been in there a good long time . Propylene Glycol is the newer not so toxic stuff .
Tap water is ok for flushing but for the final mixture rain water or distilled water is better .
"Cooling System 4.5 liters 4.75 quarts (1.2 gallons)" so we are not talking a great deal of coolant .
4 quarts of Propylene Glycol and then top it off with 1ish quart of water . That will get you a real good high boiling point .

spitfire50 Avatar
spitfire50 Paul Mugford
Rochester, N.H., USA   USA
In reply to # 1532103 by Lizzard I'd try a good mixture of new antifreeze if the old has been in there a good long time . Propylene Glycol is the newer not so toxic stuff .
Tap water is ok for flushing but for the final mixture rain water or distilled water is better .
"Cooling System 4.5 liters 4.75 quarts (1.2 gallons)" so we are not talking a great deal of coolant .
4 quarts of Propylene Glycol and then top it off with 1ish quart of water . That will get you a real good high boiling point .

Lizzard,
That probably will get rid of the boiling over problem, but the temperature gauge may read even higher with that mix. Much as with ethylene glycol, propylene glycol isn't as good a conductor of heat as water. So the more glycol in the mix the worse it is at removing the heat. Running hotter will increase the temperature difference which gets the heat out of the engine.
All the best,
Paul

sparrowpi Avatar
sparrowpi David Sherrow
Colorado Springs, CO, USA   USA
Liquid under pressure boils at a higher temperature. Go for the cheap fix first...new cap.



Just because we can, does not mean we should.

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Tonyfixit Avatar
Tonyfixit Tony M
Duncan, BC, Canada   CAN
In reply to # 1532113 by sparrowpi Liquid under pressure boils at a higher temperature. Go for the cheap fix first...new cap.


+1

Doug in Vegas Avatar
Doug in Vegas Douglas D
Las Vegas, NV, USA   USA
You can get the cap tested at your FLAPs.

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Attachments:
rad vent cap r2.JPG    45.1 KB
rad vent cap r2.JPG

claytoncnc Avatar
claytoncnc Gold Member Marcus Clayton
Melbourne, Ivanhoe, Australia   AUS
In reply to # 1532119 by Tonyfixit
In reply to # 1532113 by sparrowpi Liquid under pressure boils at a higher temperature. Go for the cheap fix first...new cap.


+1

+2

Yellowhawk Valley Avatar
walla walla, WA, USA   USA
1969 Triumph Spitfire "Walla Walla"
1969 Triumph Spitfire "Portland"
1972 Triumph Spitfire MkIV "Spokane"
1975 Triumph Spitfire 1500 "Dayton"    & more
Where is your electric fan temp probe located? Is it perhaps not telling the fan to turn on at the right time? If you turn the key on when it starts to puke, does the fan come on?If it is that hot, it probably should. Plus all the other ideas.
Dan

79bluespit Avatar
79bluespit Rick Lazio
Burlington, ON, Canada   CAN
All good suggestions. Ignition timing as well. Not enough advance.

leslandon Silver Member Les Landon
Baton Rouge, LA, USA   USA
So many great ideas - thanks! I think I'll start with a flush and new cap, (the cheap fixes) and proceed from there.

SpitnSawdust Avatar
SpitnSawdust Richard Simpson
Lewes, east sussex, UK   GBR
1969 Triumph Spitfire MkIII "Little Blue"
In reply to # 1532053 by clshore How do you know the temp gage is accurate?

Buy a cheap IR temp gun (Harbor Freight, etc.).
Calibrate readings by checking boiling water, and some ice.
Check temp readings of upper & lower hoses, radiator header, thermostat housing.

How's the coolant?

Drain & flush the system, add fresh coolant.
+1
Handy for tweaking the central heating as well

clshore Carter Shore
Beverly Hills, FL, USA   USA
In reply to # 1533795 by SpitnSawdust
In reply to # 1532053 by clshore How do you know the temp gage is accurate?

Buy a cheap IR temp gun (Harbor Freight, etc.).
Calibrate readings by checking boiling water, and some ice.
Check temp readings of upper & lower hoses, radiator header, thermostat housing.

How's the coolant?

Drain & flush the system, add fresh coolant.
+1
Handy for tweaking the central heating as well

I call mine a 'beer pyrometer'. Helps avoid opening a frozen brew.

Some clever person should make a beer coozie with a temperature sensing strip down the side ...

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