Heavy Duty Balanced Opposed Compressors - Ariel Corporation

Section 4 Part Replacement For Models: JGH:E:K:T
3. Use a hydraulic press in a qualified machine shop to install the new bushing. Do not hammer
bushing into place; it will distort the bushing bore.
4. Before installation, cool new bushing in a 95% alcohol and dry ice solution. Leave bushing in
solution long enough to reach the solution temperature, about -110°F (-80°C).
5. Position connecting rod on the press table so the chamfered edge of the rod bushing bore is on
top. Align bushing oil hole with connecting rod oil passage (if applicable) before pressing bushing
in. The bushing has an annular groove around its outside diameter aligned with the oil hole; if the
bushing shifts in the connecting rod during operation, oil still travels to the bushing inside diameter
and to the crosshead pin. However, a new bushing installation should cover no more than 1/3
of the rod oil passage hole. For ELP units with no drilled hole in the connecting rod, bushing hole
alignment is not critical (see CTB-192).
CAUTION: Do not touch cold surfaces without proper protection. Alcohol is flammable;
use it only in open air or well-ventilated buildings. Avoid sparks and open flame. Avoid
alcohol vapors which may cause injury to nose and eye tissue. Do not return solution
to a closed container until it reaches room temperature or container may explode.
NOTE: Thoroughly clean bushing and connecting rod to prevent dirt accumulation
between them. Immediately assemble them so the bushing does not warm and stick
before it is in place. If the bushing sticks, remove it by notching as in step 2 above.
Connecting Rod Installation
1. To install a new connecting rod, stamp match mark numbers matching the throw location on the
tops of the connecting rod and bearing cap (with notches up). See Fig. 4-36.
2. Check new bearing shells for handling damage, scratches, burrs, and loose material at the tabs.
DO NOT RUB BEARING SURFACE WITH FINGERNAIL. New bearing shells and crankshaft
crank pin bearing surfaces must be absolutely clean. Snap a new, dry half bearing shell into the
rod with the bearing tab properly located in the rod notch. With the crankcase top cover off, turn
the throw to inner dead center position and slide the rod into the crosshead guide space. Oil
crankshaft crank pin bearing surfaces with new clean lubricating oil, the same type used in the
frame, before connecting rod cap installation.
NOTE: Connecting rod bearings and main bearings are not interchangeable. Connecting
rod bearings have a narrower groove or no groove at all. DO NOT put main bearings in
connecting rod bearing locations.
NOTE: Caps and rods are numbered by throw beginning with number one at the drive end.
For throw numbering sequence, see Fig. i-1. Always install rods with numbers up. Protect
crank pin at all times.
3. Fit connecting rod to crank pin and turn to the highest position. Position cap, with a new half
bearing shell properly located in the notch, and the bolts. Snug all bolts; do not tighten them to
full torque.
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