Particularities of cooling in 400 2V engine |
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AtoM
Brand New Member Joined: 14-March-2020 Location: France Status: Offline Points: 1 |
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Posted: 14-March-2020 at 7:19AM |
Hi all, My first post on this forum! I have recently purchased a Gran Torino Sport 1972 (fastback), with a 400 ci engine. My first steps in making this great car great again, bring me to perform a diagnosis of the engine. It starts well however, after few minutes (idle), I've got a white smoke on half a V. I removed the spark plugs and see a white dirt on the half V with the white smoke. It is usually related to a (too) high temperature ignition. On the other V side the spark plugs are covered with a dark, coal-like material, usually related to too rich gas mix in the cylinders. The temperature measurements confirm that: after 2 minutes, on one side the V8 is 108°C (225°F) and on the other side 77°C (170°F). Hence smoke is certainly water vapor. Is there any explanation for a half V overload in temperature? I see that the upper radiator hose is coming from the hottest side, the lower one is on the coolest one. Do you know what is the water flow direction (if from lower to upper, it can comes from a low water pressure or a failing water pump). Hope to here from you soon! |
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pete rad
Senior Member Joined: 29-November-2014 Location: usa Status: Offline Points: 305 |
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pete rad
Senior Member Joined: 29-November-2014 Location: usa Status: Offline Points: 305 |
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Then the coolant travels through the lower parts of the engine block and then through the cylinder heads and it exits through the upper front of the engine into the upper radiator hose. Your engine has a "dry" intake manifold, meaning that no coolant flows through the intake manifold.
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Rockatansky
Senior Member Joined: 30-July-2010 Location: On The Road Status: Offline Points: 6059 |
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the head gasket on the hot side has been installed incorrectly
there's a passage that allows coolant from the block up into the head in the rear of the engine, that passage is blocked off when the head gasket is installed 'backwards'. see the gasket marked FRONT ? look at the opposite end (back) and find the open hole that is not present at the front of the gasket. both gaskets in the pic are oriented the same way, front is on the left and back is to the right. the most common mistake guys make is to install both gaskets with the logo side facing UP because it looks pretty that way but it's wrong. hopefully there's no engine damage from getting hot and you can fix it with a single gasket but i'm really afraid the head and the block both need to be checked for flat by a professional engine builder and remachined back to flat. the good news is the 400 needs the block to be decked to make decent power anyway Edited by Rockatansky - 14-March-2020 at 8:16AM |
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72 GT Ute
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Rockatansky
Senior Member Joined: 30-July-2010 Location: On The Road Status: Offline Points: 6059 |
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also verify that your thermostat is the correct type and the bypass restrictor plate is in place. the correct type thermo has a brass hat on the sensor bulb that closes the bypass orifice in the restrictor plate. incorrect 330 series Windsor/chevy thermo on the left, correct 333 series Cleveland style thermo on the right. see the ring on the sensor? you want that! Edited by Rockatansky - 14-March-2020 at 5:13PM |
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72 GT Ute
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Rockatansky
Senior Member Joined: 30-July-2010 Location: On The Road Status: Offline Points: 6059 |
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here's how the internal bypass system works sticky the link Vince ?
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72 GT Ute
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Rockatansky
Senior Member Joined: 30-July-2010 Location: On The Road Status: Offline Points: 6059 |
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and Hey Welcome to the forum AtoM ! sorry it has to be on this note but are you ready to build a snot-locker 400? France?!! we'll have to CC Ilyes in on this, maybe he can direct you to some competent help over there
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72 GT Ute
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72FordGTS
Admin Group GTS.org Admin Joined: 06-September-2005 Location: Ontario, Canada Status: Offline Points: 5802 |
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Done, I added it to the thermostat sticky post. |
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Vince
1972 Ford GTS Sportsroof - Survivor, One Family car GTS.org Admin |
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