cracked head?
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cracked head?
Hi,
I have a 4.9L 6 in a 92 F150. I posted a couple weeks back about a possible cracked head or blown head gasket. My only symptom is the engine overheats very quickly. I am not getting white smoke out the tailpipe nor am I losing coolant under pressure out a crack in the engine compartment. I've been told that means exhaust gases are getting in the coolant and there would be bubbling in the coolant in the overflow. I checked and I am not getting any bubbling there. All I found was a thin film of white foam at the radiator cap. I removed the spark plugs one at a time and checked the coolant each time. There was no change. Any idea what is causing this? My thermostat and water pump are fine.
Thanks
I have a 4.9L 6 in a 92 F150. I posted a couple weeks back about a possible cracked head or blown head gasket. My only symptom is the engine overheats very quickly. I am not getting white smoke out the tailpipe nor am I losing coolant under pressure out a crack in the engine compartment. I've been told that means exhaust gases are getting in the coolant and there would be bubbling in the coolant in the overflow. I checked and I am not getting any bubbling there. All I found was a thin film of white foam at the radiator cap. I removed the spark plugs one at a time and checked the coolant each time. There was no change. Any idea what is causing this? My thermostat and water pump are fine.
Thanks
Junior User
Joined: Dec 2006
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You might also check for a clogged radiator preventing adequate water flow, a faulty fan clutch, and/or a restriction in air flow across the radiator fins. I have had debris build up between the radiator and the condenser coil shutting off the air flow.
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Joined: May 2007
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From: Indiana
I agree that I would flush the cooling system. I have seen many clogged radiators cause this exact problem.
I assume that when you say that both the thermostat and pump are good then you have either tested or replaced them?
I assume that when you say that both the thermostat and pump are good then you have either tested or replaced them?
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The water pump having to be replaced is what started the whole mess for me. My sepentine belt broke while I was on the freeway. By the time I noticed the temperature spiking, I had driven 5 or 10 miles. The pump was trashed so I replaced it. It is still overheating very quickly. I took the thermostat out with the same result. A buddy of mine who is a mechanic is sure the head gasket blew or the head has a small crack. I want to try a sealant before I remove the head, but I've been told that they won't work if the crack is near any of the pistons
Freshman User
Joined: May 2007
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From: Indiana
Personally I would flush the radiator a couple of times using a quality coolant flush before I would do anything else to it. If you do happen to use a sealant then I would bypass the heater core so you don't risk stopping it up in the process.
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