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ERVOR (SCA) - 6, Rue Désiré Granet - Z.I. du Val d'Argent - 95100 ARGENTEUIL FRANCE
(33) 01 34 11 50 00 (33) 01 34 11 50 10
Web : www.ervor.com - Email : info@ervor.com
Manual G06
Edition: 10/2015 - rev A
Ovality of cylinders :
Disassemble cylinder heads
Move the piston to its lowest point to free the cylinder to be checked
Check for ovality and possible scratches inside the cylinder
Change oval or scratched cylinders
Piston rings, pistons and cylinders must be checked every 3000 hours of operating.
Position of rings :
Pistons must be assembled with three new piston rings to run in good condition.
Before mounting cylinders make sure that each gap of the piston ring is rotated 120°
approximately in relation to the gap of the preceeding piston ring.
Mounting of cylinders :
For remounting of the cylinders, start by remounting the low pressure cylinder on the piston fitted
with its rings, then mount the high pressure cylinder.
Wear of the piston ring grooves :
The efficiency of a compressor and its oil consumption depends mostly on the state of piston rings.
Piston rings must work perpendicular to the cylinder axis and therefore the side play between the
piston ring and its groove should not be too large.
Mounting play Wearing play
If the wear rate is reached, change the pistons and piston rings.
Piston ring
Piston ring
0.05 mm max
0.01 mm to 0.02 mm
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