Checking the parallelism of the axes of the piston pin and the lower head of the connecting rod
1 - assembled set of connecting rod-pin-piston; 2 - retractable knives; 3 - emphasis; 4 - caliber
Before installing the assembled connecting rod and piston group on the engine, check the parallelism of the axes of the group with a special device.
To check the bottom end of the connecting rod (without inserts) center on the retractable knives 2, and on the piston head install gauge 4.
Using a feeler gauge, check the gap between the vertical plate of the fixture and the vertical plane of the gauge at a distance of 125 mm from the corner or top end of the gauge (depending on how it touches the plate - the corner or the upper end).
The gap should not exceed 0.4 mm. If the clearance is greater, replace the connecting rod.