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10-23-2016, 03:43 PM | #1 |
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Join Date: Sep 2016
Location: Pukekohe NZ
Posts: 6
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39 Deluxe Coupe Stock Motor Losing Water
39 Deluxe Ford Coupe Stock Motor Losing Water (Non pressure system)
With a full radiator, there is water loss each time the car is used. Some of the water is blown out due to expansion, however, without topping up, each run thereafter results in more water being blown out. Trips are approx 30mins long and temps range from 100 degrees with full radiator, to 130/140 degrees after 3 or 4 trips and water level is somewhere below the top of the tubes. Have not taken it on any further trips without topping up, as I don't believe that the level should be that low. There is little or no leaks in the cooling system Compression and leak down tests OK No evidence of oil in water Motor not getting hot, max 140 degrees with water below top of tubes No Tstats at this stage Suspect partially blocked radiator. Restricted return through radiator means water pumps building pressure in top tank, causing water to blow out overflow Intend to remove and clean radiator, flush block and install new hoses and Tstats Thinking, clean radiator will improve flow, and Tstats will increase operating temp I could be completely wrong about all of this, so if anyone out there could suggest any reason/cure your help would be appreciated Rooster in a Coupe |
10-23-2016, 03:59 PM | #2 |
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Join Date: May 2010
Location: Cherryville,N.C.
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Re: 39 Deluxe Coupe Stock Motor Losing Water
Level can not be full.It has to get to a "happy" point.Put your tstats in.You need a restriction because your pumping water to fast and it is probably going out the overflow slowly.I have had the same problem before!
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10-23-2016, 04:02 PM | #3 |
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Join Date: May 2010
Location: shirley ny
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Re: 39 Deluxe Coupe Stock Motor Losing Water
try keeping the level 1 inch above tubes to allow for expansion ,if filled to top it will gust dump it out ,I would also replace the rad cap,you need to run stats also
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10-23-2016, 05:16 PM | #4 |
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Join Date: May 2010
Location: Qld, Australia
Posts: 4,215
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Re: 39 Deluxe Coupe Stock Motor Losing Water
Save your self the worry and pull the radiator,take the top tank off and clean it out,
I put this job off on my 33 for years ,then after taking it out ond cleaning it it now runs as cool as and NO coolant pumping out. Lawrie |
10-23-2016, 06:16 PM | #5 |
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Join Date: May 2010
Location: Oshkosh, Wi
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Re: 39 Deluxe Coupe Stock Motor Losing Water
Are you running anti-freeze?
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10-23-2016, 06:36 PM | #6 |
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Join Date: Sep 2016
Location: Pukekohe NZ
Posts: 6
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Re: 39 Deluxe Coupe Stock Motor Losing Water
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10-24-2016, 01:34 AM | #7 |
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Join Date: Sep 2013
Location: Spalding, United Kingdom
Posts: 306
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Re: 39 Deluxe Coupe Stock Motor Losing Water
I have a similar problem. Motor fully rebuilt, including block flush, new radiator, no stats, runs cool but uses up to half gallon on a 50 mile run. I believe you can get a low-pressure cap for the overflow to stop pumping out and loss by evaporation. Is this the solution?
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10-24-2016, 02:30 AM | #8 |
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Join Date: Sep 2016
Location: Pukekohe NZ
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Re: 39 Deluxe Coupe Stock Motor Losing Water
I know I need Tstats to increase temperature and slow the flow rate as suggested above.
I'm thinking 77yrs of crud build up causing restriction of flow in radiator and no Tstats to restrict water return to radiator, between these two I'm getting a head of water building in the top tank and what can't get through the radiator takes the next way out which is the overflow Still open to suggestion, but at this stage going to pull the radiator, install Tstats and new hoses when parts and time permit Rooster PS. Its a very original car |
10-24-2016, 07:49 AM | #9 |
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Join Date: May 2010
Location: Florida and Penna.
Posts: 4,471
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Re: 39 Deluxe Coupe Stock Motor Losing Water
You will never keep the FULL amount of water required for proper
cooling with an open over flow tube. You can modify your filler neck to take a 4 lb pressure cap or get Skip Haney's 3 lb pressure valve that go's on the bottom of the over flow tube. With either of these you can fill the top tank up to the filler neck and it will stay there for a year as long as the temperature don't get over 200. More coolant in the system equals better cooling. G.M.
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10-24-2016, 08:22 AM | #10 | |
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Re: 39 Deluxe Coupe Stock Motor Losing Water
Quote:
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10-24-2016, 09:44 AM | #11 |
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Join Date: May 2010
Location: Florida and Penna.
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Re: 39 Deluxe Coupe Stock Motor Losing Water
I use 2 gallons of full strength Preston perminate anti freeze
in 6 cars in Florida operating in 90 temperature and with 180 Bob Shewman stats they stay at 178 to 182 all the time except long periods of idle and then gets to 200. At 200 you have to get moving so the air from forward motion cools the radiator coolant. It takes about a mile at 30 plus MPH and the temp starts coming down. Shewman's stats mount up at the radiator top inlet tubes, have large flow opens allowing more flow. G.M.
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