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The average cost for a Toyota T100 Head Gasket Replacement is between $1293 ... Blown head gasket, or leaking head gasket should both be taken to a repair ...
Header gaskets are fairly expensive to replace. It depends on the labor rates of the repair facility. I would try to find a local community college that has an automotive degree program. Usually they will charge much less for the fix (to help students learn) than a garage. If that isn't an option I would replace the head gasket and not the whole engine. Of course, if there is other damaged caused by the leaky gasket that is another story. There is a lot of labor involved with replacing a header gasket. I would say anywhere from $500 to $1000 anyway. Hope this helps.
replacing a head gasket is a major repair and really should not be attempted if you dont have adequate knowledge and experince withthe process. That said, the head gasket is sandwiched between the cylinder head and the engine block. It requires removing everything from the top of the motor, then removing the cylinder head itself. The old gasket must be completely scraped off the head and the top of the block and any adhesive removed as well... The new gasket is placed on the top of the block in it correct place. Each side of the gasket must be covered with a thin coat of gasket compound. The place the head on top of the gasket, sandwiching it in between and replace the head bolts and torque them down to the required torque. Replace everything removed from top of motor in reverse order. Keep in mind that in replacing a head gasket, it is entirely possible that your problem may be the head itself instead of the gasket. While the head is off, take it to a machine shop and have them inspect it and if its needs it, have them repair it. Again . this is not a do it yourself job.
The correct way is to remove the head(s) have the head(s) checked for warpage repair as necessary then clean everything good and replace the head gaskets. There are some places that advertise a product that is suppose to seal a head gasket leak but remember if it seals the headgasket leak it may stop up your radiator, also it will just be a temporary repair
A head gasket repair is major work, not worth it unless the car is really nice and dirt cheap. One side note is that if this car has the 3.1 or 3.4 liter engine they are notorious for intake gaskets leaking that will have alot of the same symptoms as a head gasket but its alot less work to repair. Good luck!
YOU NEED TOOLS AND A HAYNES REPAIR MANAUL TO SHOW AND TELL YOU HOW HEADS ARE REMOVE.YOU NEED A STRAIGHT EDGE LIKE FRAMING SQUARE AND FEELER GAUGE TO DECK THE THE HEAD TO CHECK FOR WARPAGE.OR THE MACHINE SHOP CAN CHECK WARPAGE ON HEAD.SEE IF REPLACED HEAD GASKET AND DONT CHECK WARPAGE WHICH SHOULD NOT EXCEED 0.004 INCH.IF SO YOUR NEW HEAD GASKET WILL LEAK ALSO.
1.9L SOHC - head gasket set which includes all gaskets needed to remove cylinder head with thermostat runs about $150.00. Head mechine ( check for cracks and milled ) $145.00. Labor time to remove and reinstall cylinder head 8.5 hrs X shops labor rate.
1.9L DOHC - head gasket set and thermostat runs about $210.00. Head mechine $175.00. Labor to remove and reinstall cylinder head 10.7 hrs X shop labor rate.
Labor times per Mitchell labor book, this is a guide all repair shops used.