Diesel generator set piston, connecting rod installation tec

(1) check the piston, connecting rod, piston pin and piston pin cleanliness and deficiencies of the elastic ring, piston pin and piston pin hole clearance between 0.0028 mm to 0.0172 mm, the piston pin and connecting rod small head hole clearance of 0.0498 mm to 0.0702 mm, before assembly can heat the piston to 50 ℃ to 70 ℃ (also not heating, assembled by matching method). When the piston to mark up, head should be on the right (looked down from the top). On piston pin 15 w40 lubricating oil, and then smoothly push the piston pin into the piston pin hole and the connecting rod little head hole, piston pin should be free to slide. Piston pin elastic ring should ensure that fall within the ring groove. After the piston connecting rod to the fitting, the piston should be free.

 

(2) piston ring. The piston ring before, first 15 w40 lubricating oil with a clean brush dips in besmear to brush ring grooves. Piston ring sign up (or points) when installation should be facing up. Piston ring 120 ° staggered and don't put the opening direction of the piston pin. Oil ring with spiral line spring first and then cast iron ring, spiral line spring by mouth with cast iron oil ring opening to 180 °. When assembling, does not allow met piston ring shore scratch piston ring. Piston ring should be able to free rotation in the ring groove. Gap piston ring job openings, the ring is 0.40 mm to 0.70 mm, the second is 0.25 mm to 0.55 mm, oil ring is 0.25 mm to 0.55 mm.

 

Diesel generator set the piston connecting rod installation method

 

Piston connecting rod is installed in the diesel generator to the front of the cylinder to check marks on the piston ring at the (first link and the second sign up), piston refers to the former mark, connecting rod assembly is correct (from the piston front-end connecting rod cover should be on the right) and piston pin elastic ring is completely into the ring groove, and want to check the cleanliness and the presence of defects. Within the cylinder and piston ring 15 w40 evenly coated with lubricating oil, and then pushes the piston connecting rod component freely into the cylinder hole, assembly shall not be forced. Connecting rod bearing inner surface with grease on 105, connecting rod journal with 15 w40. Connecting rod bolt screw 2-3 button by hand, and then two tighten, tightening torque for the first time (60 + 5) N.m, then turn to 60 ° + 5 °, eventually tightening torque (105 + 20) N.m. Connecting rod bolt if there is a need to loosen, you must loosen the another bolt at the same time, and then according to the requirements of torque to tighten.

 

Connecting rod axial clearance should be 0.10 mm to 0.30 mm, the piston should be higher than on cylinder body plane 0.33 mm to 0.66 mm, if can not meet the requirements, to be selected.

 

After the piston connecting rod component loading to check the rotation of the crank shaft torque, should be in 15 to 30 n? M range, such as beyond the specified value to check and adjust.