- Engine 4A-F/FE 13.5 Bar
- Engine 3S-FE 13.0 Bar.
The wear limit for all engines is 10.0 bar. If the compression is below this value, you should decide whether to replace or repair the engine. It is also important whether one or all cylinders have insufficient compression. For example, if the difference between individual cylinders is 1.0 atm, it may be that the valves of the "bad" cylinder are stuck and only the cylinder head needs to be repaired, i.e. the valves need to be repaired. It is also possible that the piston rings are stuck, which leads to pressure venting along the piston into the crank mechanism. In most cases, a uniform loss of compression can be judged to be cylinder wear. To check the compression, warm up the engine to operating temperature and remove the spark plugs. Disconnect the middle wire from the ignition coil. On an injection engine, also disconnect the connectors from the cold start injector and from the injectors. Connect the compression tester in accordance with the manufacturer's operating instructions. The assistant should get into the car and turn on the starter for about 5 seconds, while pressing the gas pedal all the way down. Check the compression in all cylinders sequentially and compare with the specified value. If the compression is low in one cylinder, you can pour the appropriate preparation, available in the related products, into the spark plug hole as first aid for temporary compression restoration. Information about these substances can be obtained from auto parts sellers.
(The material is reprinted from an online resource: toyotaman.ru)