Floating and Knocking of Piston Pin

Floating and Knocking of Piston Pin Points : floating and knocking of piston pin, importance and problems related to piston pin, problems in internal combustion engines, ic, engine Depending upon the type and make of engine, the piston may either be free-floating pin will turn in both rod and piston or press-fit (pin force’ fitted on rod but turn in piston).

Piston pin knock occurs when too much clearance exists between the piston pin and piston bore or connecting rod bushing. Excessive clearance allows the pin to hammer against the rod or piston as the piston changes direction the cylinder.

Piston pin knock will usually make a DOUBLE KNOCK (two rapid knocks and then a short pause). Ii does NOT change much with engine load,