Heavy Duty Balanced Opposed Compressors - Ariel Corporation

FOR MODELS: JGZ AND JGU SECTION 5 - MAINTENANCE
9. See Connecting Rod Installation on page 5-6 for bearing shell installation. If
clearance readings are not within tolerance after installing new bearings, contact
your packager or Ariel before proceeding.
Connecting Rod - Removal
1. Before rotating the crankshaft, operate the pre-lube pump to lubricate the bearings.
2. Remove the top covers from the crankcase, the side covers from the crosshead
guides and gaskets.
3. Remove the top-cover spacer bars (middle bar of each set of three). Spacer
bars are a sliding fit and should be capable of being removed by hand, without
falling out or hammering to remove. If too loose or too tight contact your packager
or Ariel before proceeding.
4. Remove the piston-rod-assembly as described in “Piston and Rod - Removal”
on Page 5-36.
5. Manually rotate the crankshaft to position the throw to near the outer dead center
position and remove the lock-nut, cap screw, end plates, and crosshead pin
from the crosshead. Discard the old lock nut.
6. Remove the crosshead as described in “Crosshead - Removal” on Page 5-9.
7. While supporting the connecting rod so it does not drop and damage the crosshead
guide, manually rotate the crankshaft to near to the highest throw position.
Loosen the connecting rod-cap’s cap screws and unscrew partially out. The separately
purchased hydraulic connecting rod/main bearing-caps cap screw torquing
tool (see Figure 7-12 on Page 7-7), is used to loosen the cap bolting. This
tool reacts against the opposite diagonal cap screw. Be sure that hydraulic tool
is configured for loosening the connecting rod bolting.
8. Using the provided connecting rod cap removal tool (see Figure 7-2 on Page 7-
3), jack against the cap screw heads to pull the bearing cap free from the dowels.
Remove the top two connecting rod cap screws and the rod bearing cap.
The bottom two cap screws remain in the cap while the cap is being removed.
NOTE: DO NOT PRY OR USE A CHISEL TO SEPARATE THE CAP FROM THE CON-
NECTING ROD OR DAMAGE WILL RESULT.
9. Half of the bearing shell will come out with the cap. Remove the bearing half
shell from the cap by rotating/sliding it out.
10. Carefully support the rod, while manually rotating the crankshaft until the rod can
be taken out through the side cover openings in the crosshead guide. Take care
to prevent personal injury. Half of the bearing shell will come out with the rod,
remove by rotating/sliding it out of the rod.
11. After the removal of the connecting rods, be sure to protect the crank pins from
being nicked or scratched.
NOTE: ALL CONNECTING RODS MUST BE DETACHED FROM THE CRANKSHAFT
AND RETRACTED INTO THE CROSSHEAD GUIDES PRIOR TO REMOVING
THE CRANKSHAFT.
Connecting Rod Bushing Replacement
1. Check crosshead pin to bushing clearance (see Table 1-4 on Page 1-13 for rec-
7/09 PAGE 5 - 5