Checking the condition of the connecting rod and piston group by ear

1. When the connecting rod and piston group is in good condition, the engine runs quietly, and at idle, the oil pressure in the lubrication system does not fall below the permissible limit.

2. The knock of the pistons occurs at the moments of impact from the walls of the cylinder liners due to too loose fit. Piston play manifests itself in the form of dull blows and manifests itself mainly when the engine loads are increased, or during cold engine idling. The intensity of knocking as the engine warms up may decrease, up to complete disappearance.

3. The sound of the piston pins also occurs due to excessive loosening of their fit and is clearly audible, usually in the form of a double metallic clang when the engine is idling when the engine is warm. The easiest way to identify a faulty finger is to turn off the spark plugs one by one while the engine is running - after turning off the faulty cylinder, the knock disappears.

4. Knocks of crankshaft bearings are manifested in the form of strong metal impacts, the intensity of which increases with increasing speed.