Generac Power Systems GTV-990 Manual page 59

" "
1
CYLINDER #1
Figure 12-8. Assemble #1 Rod And Piston
NOTCH OR
CASTING MARK
TOWARD
FLYWHEEL SIDE
"
CYLINDER #2
Figure 12-9. Assemble #2 Rod And Piston
SECTION 12: PISTON, RINGS & CONNECTING ROD INSPECTION & ASSEMBLY
NOTCH OR
CASTING MARK
TOWARD
FLYWHEEL SIDE
"
2
12-3
ASSEMBLE PISTON RINGS TO PISTON
Install piston rings using ring expander when installing center
and top compression rings.
1. Install oil ring expander.
a. Install lower scraper ring.
a. Install upper scraper ring.
2. Install center compression ring with chamfer up.
3. Install top compression ring.
Note: Top compression ring may be installed with either
side up.
PISTON
RING
GROOVES
Figure 12-10. Piston Ring Installation
TOP COMPRESSION RING
(EITHER SIDE UP)
CENTER COMPRESSION RING
(CHAMFER UP)
OIL RING EXPANDER
AND SCRAPER RINGS