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Doesn't seem to have any compression after replacing head

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Do a manual inspection,with a tool to check compression,did you use the right head gasket?a new one?,did you torque it properly??did you shave the head and verify that the block was straight?

Posted on Apr 12, 2015

Testimonial: "yes done all above just seems to be blowing air from somewhere"

  •  johnny rebel
    johnny rebel Apr 12, 2015

    then find out where by putting a dye in each cylinder and turn it overand look for the dye on the motor

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Hi the very first thing which comes to my mind is why are the adjacent cylinders loosing compression, could it be a bad head gasket? let me know how you make out?

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I have just bought a 1990 Mazda 626 which has overheated.There seems to be no compression even though the camshaft and valves are working.Could the rings be damaged?


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IF YOU HAVE CYLINDER HEAD DAMAGE MORE LIKELY PISTONS HEADS DAMAGED ALSO. PROBABLY END UP BUYING REBUILT ENGINE.IF YOU BUY NEW CYLINDER HEAD, STILL DONT WORK,THEN LABOR CHARGE ADD UP AGAIN REMOVE ENGINE CYLINDER HEAD WITH CYLINDER BLOCK.IF PISTON HEADS DAMAGED, BEST TO BUY REBUILT ENGINE.

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Car overheated random cylindar misfire after the overheat after it heats up it bogs down and eventually dies. I have done a compresion test 2 center cylander are 10-15 psi depending also little black...


if the center 2 cylinders have only 10-15lbs pressure then you need to do a wet compression test to see if it is valves or piston rings that are bad.put about tablespoon of oil into each cylinder and turn over motor and redo the compression test.if the compression goes up you have a ring problem if it doesn`t it is a valve problem.you should check the oil to see if it has a white-caramel look to it as this indicates water in the oil.(head gasket) if the coolant level is low it can be burning coolant,you should have the cooling pressure tested just in case.it could possibly be a cracked head.if it overheats because of the low compression(sometimes happens) the motor is working twice as hard(runs hotter) as the other good cylinders have to work harder to do the same amount of work,

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The car over heated and now it seems to be loosing power, maybe a water in the spark plugs or gasket needs to be replace.


a cylinder compression check is needed. You can do it yourself with the proper compression gauge available at auto parts stores. This check will tell you if the cylinder head gasket is leaking. Another good test is the Lisle 75500 combustion gas leak tester. This is less expensive but will show if combustion gases are leaking into the engine coolant--a sign of head gasket failure or a cracked cylinder head.

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