Checking cylinder compression [Toyota Carina T170]

If you suspect that a cylinder has low compression, you should check it in individual cylinders using a compression meter. This is more difficult to do on a diesel engine, since an adapter is required that is screwed in instead of spark plugs. In this case, pistons, valves or piston rings that do not hold pressure are identified. If the engine is still relatively new, compression of about 32.0 Bar should be ensured. The wear limit is 20.0 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 poor compression. For example, if the difference in individual cylinders is 5.0 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 burnt in the grooves, which leads to pressure bleed along the piston into the crank mechanism. In most cases, the same loss of compression indicates cylinder wear. To check the compression, warm up the engine to operating temperature and remove the glow plugs. Disconnect the wire from the fuel shut-off valve. Connect the compression tester in accordance with the manufacturer's operating instructions. An assistant should get into the car and turn on the starter for about 5 seconds, while pressing the gas pedal all the way down. Sequentially check the compression in all cylinders and compare with the specified value. If the compression is low in one cylinder, you can pour the appropriate product into the spark plug hole as first aid to temporarily restore the density. Information about these products can be obtained from auto parts dealers.

(See the source on the internet resource: Toyotaman.ru)