Cleaning
1. Remove all components and electrical sensors from the cylinder block. For complete cleaning, remove the service plugs. To remove the service plug, use a punch to turn the service plug in the socket and...
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2....using pliers, remove it from the cylinder block.
3. You can also drill a small hole in the plug and screw a self-tapping screw into the hole to remove the technological plug. Pull the screw head to remove the technological plug. On the 1MZ-FE engine, the technological plugs are attached to the cylinder block with nuts.
4. Remove all traces of gaskets from the mating surfaces of the engine block.
5. Remove all oil line plugs. Use new plugs when installing.
6. Clean the dirtiest areas with steam.
7. Clean all oil holes and oil lines. Flush all internal passages with warm water until the water runs clear. It is necessary to completely dry the cylinder block and lubricate all mating surfaces with a thin layer of oil to prevent corrosion. Also lubricate the engine cylinders. If compressed air is available, use it to speed up the drying process and blow out all oil holes and lines.
8. Thoroughly clean all threaded holes using a tap with the appropriate thread size, then blow out the holes with compressed air.
(The material is republished from an online website ToyotaMan)
9. Install the plugs into the oil line in the engine block and tighten them securely.
10. If the engine is not to be reassembled immediately, cover the cylinder block with a large plastic bag to protect it from contamination.
Examination
The measurement locations for the liner diameter of each cylinder are at the top (A), center (B) and base (C)
1. Visually inspect the cylinder block for corrosion. Check the integrity of the threads in the threaded holes.
2. Check the engine cylinder bore for wear by looking for a step at the top of the cylinder.
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3. If you have a measuring tool, measure the bore diameter of each cylinder at the top (under the wear step) in the center and at the base parallel to the crankshaft axis.
4. Then make the same measurements perpendicular to the crankshaft axis and compare them with the technical data. Repeat the measurement procedure on the remaining cylinder liners.
5. Using a steel ruler and a feeler gauge blade, check the flatness of the mating surface of the engine block.
Cylinder honing
Honing of cylinder walls creates the most favorable conditions for the operation of piston rings. The most widely used honing tool is one with spring-loaded bars. A honing tool in the form of a round wire brush is also widely used. In addition, some kerosene, rags, and an electric drill are required for honing.
1. Install the main bearing caps and tighten the mounting bolts to the specified torque.
2. Attach the honing tool to the electric drill and insert it into the cylinder.
3. Apply a thin layer of kerosene to the cylinder walls, turn on the electric drill and move the honing tool up and down until a regular intersecting pattern is formed on the walls. Ideally, the lines should intersect at an angle of 60°. Make sure that the walls are wetted with a thin layer of kerosene during the honing process.
4. Do not remove the honing tool from the cylinder block while the electric drill is on. Moreover, make several strokes of the honing tool while the drill is off and only then remove it from the cylinder block.
5. Hone the remaining cylinders in the same manner.
6. Thoroughly rinse the cylinder block from any remaining abrasive tool.
7. Dry the cylinder block and lubricate the surfaces with a thin layer of oil.