F
OR
M
ODELS
: JGI, JGM, JGN, JGP
AND
JGQ
S
ECTION
6 - T
ECHNICAL
A
SSISTANCE
PAGE 6-4
and tighten center bolts. Reference Ariel Technical Manual, Fastener Torque
Tightening Values or Toolbox Torque Chart, ER-63.
4.
Inspect cylinder bores for damage or wear. If the cylinder bore surface is blem-
ished or gouged, efficiency can be affected and/or rapid ring wear can result, or
is more than 0.001 inch per inch of cylinder bore diameter (0.001 mm/mm) out of
round or tapered, the cylinder body should be replaced or the bore restored.
Contact Ariel for re-boring and bore restoration guidelines.
5.
Inspect piston ring end gap. Replace rings that are outside the maximum limit
listed in the Ariel Technical Manual, Clearance Tables.
6.
Inspect piston rods for damage and excessive wear. If gouged or scratched,
replace the rod. If the rod is more than 0.005 inch (0.13 mm) under size, out of
round more than 0.001 inch (0.03 mm), or tapered more than 0.002 inch (0.05
mm) replace the rod.
7.
Rebuild cylinder packing cases.
8.
Check and re-calibrate all temperature and pressure gauges.
9.
Check and record compressor rod run out.
10. Grease VVCP stem threads at grease fitting, with 2 to 3 pumps of multi-purpose
grease using a standard hand pump grease gun.
11.
Clean crankcase breather filter.
12. Adjust drive chains.
13. Pressure test distribution blocks.
14. Check gas nozzle flange, valve cap, cylinder heads, compressor rod packing,
crosshead pin through bolt, crosshead guide to frame, crosshead guide to cylin-
der, cylinder mounting flange to forged steel cylinder, distance piece to cylinder,
distance piece to crosshead guide and tandem cylinder to cylinder fastener
torque.
15. If the compressor is equipped with crankcase over-pressure relief valves,
inspect and exercise valves to the manufacturer’s recommendations.
Every 2 Years or 16,000 Hours (plus Daily/Monthly/6 Months/
Yearly)
1.
Check auxiliary end chain drive for sprocket teeth undercutting and chain for
excessive stretching.
2.
Rebuild oil wiper cases.
Every 4 Years or 32,000 Hours (plus Daily/Monthly/6 Months/1 &
2 Years)
1.
Check crosshead pin to crosshead pin bore and connecting rod bushing bore by
removing crosshead pins.
2.
Check for excessive wear in the auxiliary end drive chain tightener.
3.
Check for excessive ring groove wear in pistons.
