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How to Replace the Head Gasket on a 1999 Mazda 626

Manufactured for the export market, the Mazda 626 first appeared in the U.S. in 1979. The 1999 version of the 626 is a four-door family sedan that was powered by a 2.0-liter, inline four-cylinder engine that produced 125 horsepower and 127 foot-pounds of torque. A leaking gasket that caused poor engine performance was one of the engines issues.

Instructions

1

Disconnect the negative (ground) battery cable. Remove the timing belt. Remove the front exhaust pipe. Remove the air cleaner. Remove the accelerator cable. Disconnect the fuel hose. Remove the ignition coil.

2

Drain the engine coolant. Verify the engine oil level. Inspect for engine oil, engine coolant and fuel leakage. Inspect the pulleys and the drive belt for runout and contact.

3

Hold the camshaft by using a wrench on the cast hexagon, and loosen the camshaft pulley lock bolt. Loosen the camshaft cap bolts in two or three steps. Arrange the removed camshaft caps to ensure correct placement during installation. Temporarily install the number three engine mount rubber to support the engine. Loosen the cylinder head bolts in two or three steps. Remove the cylinder head. Remove the old head gasket. Clean the surface of the block from any dirt and debris with a degreaser. Place the new head gasket on the block.

4

Measure the length of each bolt used to tighten the cylinder head. Replace any that exceed the maximum length. Standard length is 4.103 to 4.125 inches. Maximum length would be 4.154 inches. Tighten the cylinder head bolts in two or three steps. Tightening torque shouldnt exceed 16.2 foot-pounds for each step. To install everything back, just follow the removal sequence in reverse. Remember to connect the negative battery cable back to the battery.