The Ford Barn

Clem Clement · 11-08-2016, 08:02 PM

My son recently installed his commercially rebuilt 260 engine. After about 20 minutes of run time on the road, she burped a mass of water from the cap. Radiator does not leak. Thermostat replaced twice, cap replaced, radiator clean.

Sounds to me like the wrong gasket or an upside down gasket traps water someplace??
Assistance please.

Kurt in NJ · 11-08-2016, 08:20 PM

I think with the advent of the serpentine belt that some waterpumps turn the other direction---perhaps the wrong waterpump was used, without a thermostat perhaps you can look for flow and direction with the cap off

Marcus · 11-08-2016, 08:21 PM

Clem: Make sure the thermostat is installed CORRECTLY - if it is backward, exactly that problem will occur - ask me how I know!

By the way - VOTED today: you and I have too much combat time to ever allow this day to pass without recognition. Welcome home, Brother.

Clem Clement · 11-08-2016, 09:23 PM

thanks. No serpentine belt as tis is a early 64 car. Thanks Marcus. Welcome home to you as well.

Kurt in NJ · 11-08-2016, 09:41 PM

it still could be a water pump for serpentine car--made to pump spinning counterclockwise-----I have seen it before with a problem similar to yours----

i have also seen a backwards thermostat (I did it) work for several years then cause problem

take the thermostat out and you should be able to see the flow with the cap off

40 Deluxe · 11-08-2016, 10:58 PM

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Head gasket installed backwards.

Dodge · 11-09-2016, 12:54 AM

Probably not the wrong water pump as the 260 timing cover/water pump mount is very different that the reverse rotation pump bolt pattern.
Did you run the motor until the the thermostat opened up and burped and had to add more water or was it just filled and driven?

Clem Clement · 11-09-2016, 07:48 AM

It has occurred several times

BILL WILLIAMSON · 11-09-2016, 08:01 AM

Be sure the heater water valve is ON. That helps prevent AIR locks.
"Maybe" it has a combustion leak????
Bill W.

tbirdtbird · 11-09-2016, 10:37 AM

late timing?

baldmustang · 11-11-2016, 09:40 PM

Hi, also be sure thermostat has a small hole in it to release air. Mustangs do tend to release water when hot.

Jerry in Shasta · 11-11-2016, 10:58 PM

Do you have the right radiator. I think a 144 or 200 CI was a standard for engine for a 641/2
just my W.A.G
JB

11-08-2016, 08:02 PM	#1
Clem Clement Senior Member Join Date: May 2010 Location: Fairfax, VA Posts: 3,532	Not Model A: Mustang Q My son recently installed his commercially rebuilt 260 engine. After about 20 minutes of run time on the road, she burped a mass of water from the cap. Radiator does not leak. Thermostat replaced twice, cap replaced, radiator clean. Sounds to me like the wrong gasket or an upside down gasket traps water someplace?? Assistance please.

11-08-2016, 08:20 PM	#2
Kurt in NJ Senior Member Join Date: May 2010 Location: on the Littlefield Posts: 6,555	Re: Not Model A: Mustang Q I think with the advent of the serpentine belt that some waterpumps turn the other direction---perhaps the wrong waterpump was used, without a thermostat perhaps you can look for flow and direction with the cap off

11-08-2016, 08:21 PM	#3
Marcus Senior Member Join Date: May 2010 Location: Walnut Grove, Mississippi Posts: 609	Re: Not Model A: Mustang Q Clem: Make sure the thermostat is installed CORRECTLY - if it is backward, exactly that problem will occur - ask me how I know! By the way - VOTED today: you and I have too much combat time to ever allow this day to pass without recognition. Welcome home, Brother. __________________ WARM REGARDS, MARCUS

11-08-2016, 09:23 PM	#4
Clem Clement Senior Member Join Date: May 2010 Location: Fairfax, VA Posts: 3,532	Re: Not Model A: Mustang Q thanks. No serpentine belt as tis is a early 64 car. Thanks Marcus. Welcome home to you as well.

11-08-2016, 09:41 PM	#5
Kurt in NJ Senior Member Join Date: May 2010 Location: on the Littlefield Posts: 6,555	Re: Not Model A: Mustang Q it still could be a water pump for serpentine car--made to pump spinning counterclockwise-----I have seen it before with a problem similar to yours---- i have also seen a backwards thermostat (I did it) work for several years then cause problem take the thermostat out and you should be able to see the flow with the cap off

11-08-2016, 10:58 PM	#6
40 Deluxe Senior Member Join Date: May 2010 Location: now Kuna, Idaho Posts: 3,818	Re: Not Model A: Mustang Q Sponsored Links (Register now to hide all advertisements) Head gasket installed backwards.

11-09-2016, 12:54 AM	#7
Dodge Senior Member Join Date: Nov 2011 Location: Sonoma, CA. Posts: 1,568	Re: Not Model A: Mustang Q Probably not the wrong water pump as the 260 timing cover/water pump mount is very different that the reverse rotation pump bolt pattern. Did you run the motor until the the thermostat opened up and burped and had to add more water or was it just filled and driven?

11-09-2016, 07:48 AM	#8
Clem Clement Senior Member Join Date: May 2010 Location: Fairfax, VA Posts: 3,532	Re: Not Model A: Mustang Q It has occurred several times

11-09-2016, 08:01 AM	#9
BILL WILLIAMSON Senior Member Join Date: Dec 2010 Location: FRESNO, CA Posts: 12,560	Re: Not Model A: Mustang Q Be sure the heater water valve is ON. That helps prevent AIR locks. "Maybe" it has a combustion leak???? Bill W. __________________ "THE ASSISTANT GURU OF STUFF" Last edited by BILL WILLIAMSON; 11-09-2016 at 10:27 AM.

11-09-2016, 10:37 AM	#10
tbirdtbird BANNED Join Date: May 2012 Location: inside your RAM Posts: 3,134	Re: Not Model A: Mustang Q late timing? __________________ '31 180A

11-11-2016, 09:40 PM	#11
baldmustang Junior Member Join Date: Jul 2014 Location: Tracy CA Posts: 22	Re: Not Model A: Mustang Q Hi, also be sure thermostat has a small hole in it to release air. Mustangs do tend to release water when hot.

11-11-2016, 10:58 PM	#12
Jerry in Shasta Senior Member Join Date: Jun 2010 Location: (Old)Shasta (Redding) CA Posts: 388	Re: Not Model A: Mustang Q Do you have the right radiator. I think a 144 or 200 CI was a standard for engine for a 641/2 just my W.A.G JB __________________ Connoisseur of Rust