FOR MODELS: JGI, JGM, JGN, JGP AND JGQ SECTION 5 - MAINTENANCE
PAGE 5-32 9/08
readings, taken without the use of feelers are to be used for acceptance. Copy Table 5-3 and
record calculations and readings.
TABLE 5-3 FEELER THICKNESS TO CORRECT FOR PISTON WEIGHT
If readings are not within acceptable limits after replacing worn parts and correcting any pip-
ing misalignment, the piston rod assembly should be replaced.
Piston Rings
JGI, JGM, JGP, JGN and JGQ cylinders use one-piece angle cut filled Teflon piston rings.
Determining Ring Wear:
Ariel recommends replacing rings when the end gap has increased three times the new
dimension. To measure the end gaps, insert the rings in the cylinders without pistons. (See
Table 1-7 on page 1-12 or Table 1-9 on page 1-14 for new end gap dimensions.)
Removal:
See paragraph 3. at “Piston and Rod” on page 5-27 for piston ring removal.
Piston Rings - Installation
1. Place the rings over the grooves in the piston. Compress the Teflon one-piece
rings by hand.
2. With the rings fully compressed in the grooves, insert the rod and piston into the
cylinder
. Make sure the rings stay in place while inserting the piston and rod.
NOTE: RING GAPS ARE TO BE STAGGERED AROUND THE PISTON, RATHER THAN
IN LINE.
3. Follow the steps under “Piston and Rod - Installation” on p
age 5-30.
Wear Bands
1-3/4JG-FS-HE and 1-3/4SG-FS-HE cylinder class pistons use a one-piece angle cut Teflon
wear band.
LINE THROW NUMBER: 1 2
1. Top Feeler Clearance
2. Line 1 (Divided by 2)
3.
Line 2 - 0.003 in.
(-0.08 mm)
- 0.003 in.
(-0.08 mm)
- 0.003 in.
(-0.08 mm)
4. Bottom Feeler Thickness
5. Vertical - Piston @ CE 0 0
6. Vertical - Piston @ HE
To Next Page
Loading...
Need help?
General
