3.8.10. Check of parallelism of axes of the lower head of a rod and piston ring


Fig. 3-34. Check of parallelism of axes of a piston finger and lower head of a rod: 1 — a collected set the rod-finger-piston; 2 — sliding knives; 3 — an emphasis; 4 — caliber

Before installation of gathered conrod and piston group check parallelism of axes of group for the engine the special device (fig. 3-34).
For check align the lower head of a rod (without inserts) on sliding knives 2, and on the bottom of the piston establish caliber 4. A set of probes check a gap between a vertical plate of adaptation and the vertical plane of caliber at distance of 125 mm from a corner or the top end of caliber (depending on what it concerns a plate — a corner or the top end).
The gap should not exceed 0,4 mm. If the gap is more, replace a rod.