Ariel Heavy Duty Balanced Opposed Compressor JGQ/2

Follow instructions in 'CAUTION' on Page 5-2. Remove coupling spacer or otherwise lockout.

Remove the cap screws from main (journal) bearing cap #1. Pull the cap straight up to prevent damage to the dowel fit.

If the cap is tight, use a Bearing Cap Puller as illustrated in Figure 5-13 on Page 5-17.

Attach clean nylon lifting straps around the crankshaft and lift slightly to take some of the weight off the bearings.

Remove the shell from the main bearing cap.

Crosshead Pin and Connecting Rod Inspection

Check crosshead pin to crosshead pin bore and connecting rod bushing bore

Check for excessive wear in the auxiliary end drive chain tightener

Check for excessive ring groove wear in pistons

Examine the sprocket for signs of wear

Drill a hole in the sprocket hub parallel to the shaft centerline

Relieve the shrink by drilling and use hammer and chisel

Check crosshead pin to connecting rod bushing clearance

Inspect the pin for wear and replace if necessary

File or hack saw the existing bushing to reduce tightness

File or saw across the length of the bushing to within 1/32 inch (1 mm) of its radial thickness

Ensure no damage to the connecting rod bore

Cool the new bushing in a 95% alcohol solution with dry ice

Ensure main bearing caps are not removed unless replacing bearings.

Determine main bearing wear by checking the following

Measure main bearing vertical jack clearances using dial indicators.

Turn an adjacent throw up to the highest position.

Place lifting strap completely around the crankshaft at the adjacent web and attach strap to a crane or a long pry bar.

Install a magnetic stand on the top of the main bearing cap, with a needle type dial indicator placed against the top of the crankshaft web of the adjacent turned up throw.

Push down and set indicator to zero.