Assembly of Exhaust Gas Turbocharger for Diesel Generator Set Part 2

Continuing from the previous text, we will introduce to diesel generator users how the exhaust turbocharger of a diesel generator set is assembled.

7. Apply clean engine oil to the shaft seal that has been installed with an elastic sealing ring, and then install it into the corresponding seat hole on the compressor end air seal plate. Before installation, offset the opening positions of the two rings by 180 degrees, and insert the "o" - shaped rubber sealing ring into the groove on the outer circumference of the compressor air seal plate. In order to facilitate pressing into the middle shell, apply some thin engine oil to the outer surface of the rubber sealing ring, and then press it into the middle shell body.

 

8. After aligning the dynamic balance marks on the rotor and compressor impeller, put on the compressor impeller, screw on the self-locking nut and tighten it until it aligns with the dynamic balance mark on the shaft end face [the tightening torque at this time is 39-44N. m (4-4.5kgf. m)], and do not allow the compressor impeller to rotate relative to the shaft during tightening (if the compressor impeller cannot be smoothly inserted into the shaft, it can be immersed in boiling water and heated before inserting).

 

9. Remove the finished assembly from the vise and install it into the bladeless volute according to the original markings. Be careful not to tilt during assembly to avoid damaging the top part of the turbine blades. Then install the pressure plate and stop washer at the end of the drum, tighten the hex nut (tightening torque is 39N. m (4kgf. m)), and lock the stop washer with 8 nuts.

 

10. Align the compressor housing with the mark and install it into the middle housing. Before assembly, insert the "v" - shaped clamp into the middle housing and be careful not to tilt it during assembly to avoid damaging the top part of the compressor impeller blades from the foot arc of the compressor housing. Install the "v" - shaped clamp and tighten the bolt with a tightening torque of 14.7N-m (1.5kgf-m).

 

After injecting clean engine oil into the oil inlet hole of the middle shell, the impeller should rotate flexibly by hand, and the well should be carefully monitored to check for any collision or rubbing sounds.

 

After the final assembly, the following two items should be measured.

 

1. To measure the axial movement of the turbine compressor rotor, place the iron suction gauge seat with a dial gauge on the flange plane at the outlet of the volute, place the measuring rod end of the dial gauge on the hexagonal shoulder plane at the outlet of the turbine impeller, and then manually push and pull the rotor shaft to measure the maximum axial movement, which should be less than 0 If the value exceeds 25mm, further inspection of various components such as thrust bearings and thrust plates should be carried out. This method can be used for measuring when the turbocharger is already installed in the unit.

 

2. For the radial clearance of the compressor, use your fingers to press the self-locking nut on the rotor shaft from the radial direction, and then measure the minimum clearance between the compressor impeller blades and the compressor casing with a thickness gauge. This clearance should be greater than 0.15mm. If it is less than this value, it should be disassembled and inspected. Be careful not to damage the blades on the impeller during inspection. This method can also be performed on units that have already installed a turbocharger.

 

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