Question about 1994 Mercury Grand Marquis

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How will i know which head gasket to change on my ford ex

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Have a compression test done and the bank showing irregular compression readings will be the one.

Posted on Nov 18, 2013

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I assume this is a 'V' motor. Do a compression test and repair the one on the bank with low compression. Of course, if you are stripping the motor down that far, the smart thing to do is to replace both head gaskets.

Posted on Nov 18, 2013

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Kia spectra 2006 ex, won't crank up after overheating, changed the head gasket, but still won't crank up...


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Have a 2002 ford explorer with 4.6 engine going through anti freeze 2 gallon a week. anti freeze in oil took heads off and did not see any bad gaskits or any signs of warpage on heads not sure if just the...


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1 Answer

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I would change both, as well as use new head bolts. Make sure your heads are not warped or cracked, especially the one that is leaking. There may not be any need to change the head if it is not cracked. These are prone to blowing a gasket especially after 150K miles or so. It will not cost a huge additional amount to change both head gaskets since the engine will have to be disassembled down to the heads anyway. Hope this helps you, Rick

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1 Answer

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first up , if there was no compression test done to determine if the head gasket is in fact at fault then do not take that persons word for the fault
the original problem could be blocked radiator cores that could handle the extra cooling required by the long trip at speed, could be a problem thermostat or radiator hose collapsing
while you may now have a problem head gasket / warped/cracked head that is just the symptom of a failure elsewhere
from your statement I would recommend that you find an accredited service center with experience on your make of vehicle and get proper diagnosis and quotes as it will cost you a lot more from your inexperience if you diy

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If there is oil in the radiator - DO NOT DRIVE THE CAR. You are risking serious engine damage. After you change the head gasket, you must change the oil and the antifreeze. You definitely have at least a blown head gasket. On the bright side you know for sure which head to take off.

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2 Answers

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Do your compression test to see which cylinder is low so you know which head to pull (v8). Bet on a blown head gasket. Go to your friendly neighborhood parts store and buy a Haynes manual for your make and model. They're around $30 and if you do your own work, it'll pay for itself ten fold, you won't regret it. It'll have step by step instructions for the whole job including torque specs and schematic drawings and pictures. A weekend job for a novice, day for an expert. Good luck and post your results.

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