ERVOR G06 - E - 1 - Mounting of Rings; General Arrangement of Piston Rings; Mounting of Scraper Piston Rings; Mounting of Anti-Leak Piston Rings

Page 31
Manual G06
Edition: 10/2015 - rev A
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
10 - E - 1 - MOUNTING OF RINGS
It is recommended that piston ring spreaders are used for ease of assembly and to avoid damaging
the piston rings or grooves.
Do not use cutting tools (scriber etc....)
General arrangement of piston rings :
The piston rings are arranged as follows :
- anti-leak piston rings at the head of the piston = on the cylinder head side
- scraper piston rings at the back of the piston = on the casing side
(scraper piston rings with holes for the return flow of oil to the casing are fitted in the grooves : see
figure below)
Mounting of scraper piston rings :
There is no special direction for mounting
Mounting of anti-leak piston rings :
Anti-leak piston rings used in ERVOR compressors are conical. Therefore it is imperative to mount
them in the correct direction.
A mark is etched on one of the faces of the anti-leak piston rings.
The piston ring should be mounted so as to place this mark on the cylinder head side (see above)
Checking of piston ring play in their grooves :
The piston rings fitted in their respective grooves must slide freely.
Mounting play = 0,015 to 0,02 mm
After mounting the piston rings, shake the piston to ensure that all piston rings slide
freely in their respective grooves.
Cylinder head
Anti-leak piston ring
marked face
Return oil