Checking the cylinder block for leaks (VAZ-21011)

1. If there is a suspicion of coolant getting into the crankcase, then check the cylinder block for leaks on a special stand. To do this, having plugged the openings of the cooling jacket of the cylinder block, pump water at room temperature into it under a pressure of 0.3 MPa (3 kgf/cm²). There should be no water leakage from the cylinder block within two minutes.

2. If oil is observed getting into the coolant, then without completely disassembling the engine, check for cracks in the cylinder block in the oil channel areas. To do this, drain the coolant from the cooling system, remove the cylinder head, fill the cooling jacket of the cylinder block with water and supply compressed air to the vertical oil channel of the cylinder block. If air bubbles appear in the water filling the cooling jacket, replace the cylinder block.