5.4 Bearings
The compressor crankshaft is fitted with replaceable, two-piece sleeve bearings. The central frame bearing also controls movement of the shaft in the axial direction.
The crosshead bearings are one-piece sleeve bearings which are pressed into the connecting rods. Tolerances and clearances for the crankshaft, frame and crosshead bearings are set out in Table 6.4.
All the sleeve bearings are pressure lubricated.
Following inspection or replacement of the crankshaft or frame bearings, it is important to ensure that the bearing bushes do not pinch the crankshaft. It should be possible to turn over the compressor by hand.
New two-piece bearings are treated with a running-in coating.
Assembling a crosshead bearing liner on a connecting rod:
A Remove old liner using a hydraulic press or puller.
B Push in new liner.
C After assembly of the bearing bush, a hole must be drilled for the oil supply and locking screw.
Drill diameter: 6.8 mm.
D The hole for the locking screw must have M8 thread.
Fig. 5.1 Assembling crosshead bearing liner
- 1. Personal safety
- 2. About the compressor
- 2.1 Construction
- 2.2 Safety equipment
- Important: The safety valves, bursting disc and any other safety equipment must be inspected regularly.
- 3. Installation and operation
- 3.1 Installation instructions
- 3.2 Cooling water system
- 3.3 Start-up
- 3.4 Operation
- 3.5 Stopping
- 4. Operational failures
- Important: When inspecting the valves, loosen the clamp bolt on the valve cover before removing the cover.
- Valve overhaul and maintenance
- 5.3 Lubrication system
- 5.4 Bearings
- 5.5 Pistons and piston rings
- 5.7 Coolers
- 5.8 Filters