Heavy Duty Balanced Opposed Compressors - Ariel Corporation

Section 4 Part Replacement For Models: JGH:E:K:T
5. Lift crosshead end of connecting rod and
turn crankshaft to its outer dead center
position to locate the connecting rod in
position and insert crosshead pin. Use
Crosshead Pin Alignment Tool on the opposite
side of the crosshead to assist pin
insertion. Oil crosshead pin and alignment
tool prior to installation. Install crosshead
pin end-plates, thru-bolt, and a new lock
nut. Tighten thru-bolt and lock nut to the
value listed in Table A-3 in Appendix A.
(TIP: If pin insertion is difficult, chill it first.)
6. Lubricate piston rod threads with Never-
Seez regular grade. Re-thread crossheadbalance
nut onto piston rod; allow enough
clearance to attach rod to crosshead. Position
setscrew cup points on crosshead side
of nut.
Crosshead
Alignment Tool
Connecting Rod
Crosshead Pin
FIGURE 4-32 Crosshead Alignment
Tool (B-1989) - Typical
7. Position crankshaft at inner dead center position of throw. Use a dial indicator with a magnetic
base to indicate crosshead location when finding exact inner and outer dead center positions.
NOTE: At this point, set piston end clearance or serious damage may occur. See required
piston crank end clearance on cylinder data plate and Table B-2 in Appendix B.
8. Insert a feeler gage, equal to the required crank end clearance, through an open valve pocket.
For 13 in. (330 mm) and larger cylinders, insert feeler gage through a bottom valve pocket. Use
the tools illustrated in Fig. 4-12 to thread piston rod into crosshead until piston is tight against the
feeler gage, and the feeler gage cannot be removed manually.
9. Tighten crosshead-balance nut in one of two ways:
• Strike the special slugging peg or open end wrench (see Fig. 1-1) with a dead blow semi-soft
faced hammer until an audible difference can be heard or the wrench “bounces” indicating a
tight nut. Some mechanics obtain desired tightness in 3 to 4 strikes; others may require more.
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