Question 1

How to install the cylinder head gasket and related components on Toyota Corolla?

Accepted Answer

Begin by putting a fresh gasket onto the cylinder block surface so the Lot No. stamp faces upward and clear the contact surfaces from oil before setting the gasket in proper alignment. First apply engine oil to the bolt threads then to the area beneath bolt heads that contacts washers before screwing bolts into the cylinder head while being cautious not to drop washers into it. Combine a 10 mm bi-hexagon wrench to apply even torque when tightening the 10 cylinder head set bolts with their plate washers secured in the recommended order until reaching the prescribed 49 Nm (500 kgf-cm, 36 ft-lbf) torque. Apply paint to the front side of the cylinder head bolts and tighten them another 90 degrees before completing with a 45-degree turn to achieve a 135-degree angle with the front of the cylinder head. The next step includes mounting the valve lash adjuster assembly and simultaneously installing the No. 1 valve rocker arm sub-assembly along with the No. 1 camshaft bearing and No. 2 camshaft bearing and No. 2 camshaft and camshaft followed by the camshaft bearing cap and camshaft housing sub-assembly and camshaft timing gear assembly and camshaft timing exhaust gear assembly. Use 2 bolts to install the No. 1 chain vibration damper then tighten the bolts to 21 Nm (214 kgf-cm, 16 ft-lbf). Verify the No. 1 cylinder TDC/compression and briefly tighten the crankshaft pulley bolt. You can then turn the crankshaft counterclockwise to position the timing gear key at the uppermost point before removing the crankshaft pulley bolt. Edge the mark plate (orange) to the timing mark of the No. 2 camshaft while installing the chain. Position the mark plate at the front of the engine while avoiding the sprocket of the camshaft timing gear assembly. Install the chain on the crankshaft without going beneath the shaft while using a wrench to grasp the hexagonal camshaft portion then rotate the camshaft timing gear assembly counterclockwise to join the mark plate (orange) with the timing mark before turning it clockwise for chain tension. Check that the crankshaft timing gear receives the chain through the mark plates between the yellow and timing marks when placed at TDC/compression when installing the chain. The installation process includes installation of the chain tensioner slipper followed by the timing chain cover oil seal and then the timing chain cover sub-assembly and crankshaft pulley then the No. 1 chain tensioner assembly and cylinder head cover sub-assembly and radio setting condenser and thermostat then inlet water and inlet water hose and water by-pass hose and No. 1 water by-pass pipe and connection of No. 3 water by-pass hose and ventilation hose. The installer must install the exhaust manifold followed by manifold stay and No. 1 exhaust manifold heat insulator and then install the oil level dipstick sub-assembly with ignition coil assembly and fuel injector assembly and No. 1 delivery pipe spacer together with the fuel delivery pipe sub-assembly and fuel tube sub-assembly before installing the intake manifold. To finish up install the engine stand then position the engine assembly with transaxle.

Question 2

How to remove the cylinder head gasket on Toyota Corolla?

Accepted Answer

The first step for cylinder head gasket removal from the 2ZR-FE starts by uninstalling the engine along with transaxle before installing the engine stand. Start by taking out the intake manifold before unhooking the fuel tube sub-assembly and removing the fuel delivery pipe sub-assembly followed by removal of the fuel injector assembly. The next step requires removal of all components starting from ignition coil assembly then moving to oil level dipstick sub-assembly, proceeding to No. 1 exhaust manifold heat insulator, and finishing with manifold stay, exhaust manifold, ventilation hose, No. 3 water by-pass hose, No. 1 water by-pass pipe, water by-pass hose, inlet water hose, inlet water, and lastly the thermostat. Detach both the radio setting condenser and the cylinder head cover sub-assembly from service. To set the No. 1 cylinder at TDC/compression alignment must occur between the crankshaft pulley groove and timing mark "0" on the timing chain cover while maintaining proper alignment of the camshaft timing gear and sprocket marks. Extract the crankshaft pulley while taking away the No. 1 chain tensioner assembly followed by the timing chain cover sub-assembly and timing chain cover oil seal and chain tensioner slipper. To release the No. 1 chain vibration damper workers must first remove two bolts and Clockwise turn the camshaft timing gear assembly by holding the hexagonal camshaft portion. The camshaft timing gear assembly requires a chain removal while the camshaft is turned clockwise until it reaches its original position. Next remove the No. 2 chain vibration damper from the camshaft assembly and proceed to inspect the camshaft timing gear assembly as well as the camshaft timing exhaust gear assembly before taking these components together with the camshaft bearing cap and camshaft out of the unit. Detach the No. 2 camshaft with additional items such as the No. 1 camshaft bearing and No. 1 valve rocker arm sub-assembly then remove the valve lash adjuster assembly and No. 2 camshaft bearing alongside the camshaft housing sub-assembly. Finished by applying a 10 mm bi-hexagon wrench to uniformly loosen then remove the 10 cylinder head bolts joined with 10 plate washers in the designated order. Afterward, carefully separate the cylinder head from the cylinder block using a pry tool. The last step removes the cylinder head gasket. The technician should conduct inspections on both No. 1 valve rocker arm sub-assembly and valve lash adjuster assembly and on the cylinder head set bolt when required.

OEM Toyota Corolla Cylinder Head Gasket

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Toyota Corolla Cylinder Head Gasket Parts and Q&A

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