Generac Power Systems GTV99O Service Manual page 56

SECTION 12: PISTON, RINGS & CONNECTING ROD INSPECTION & ASSEMBLY
Figute l2-4. Che&ing Ring End Gap
Figure 12-6. Check Piston Pin
CONNECTING ROD REJECT SIZE
Crankpin Bearing Piston Pin Bearing
1.539" (39.09mm) .7894' (20.05mn)
Figute l2-5. Ched< Piston Pin Eote
CHECKING PISTON PIN AND CONNECTING ROD
1- Check piston pin, Figure 12-6.
a. Replace if less than .7862' (l9.97mnr)or if it is .0005'
(.01 mm) out of round.
2. Check connecting rod bea ngs.
Note: ll ctankpin bearing is s.orcd or won the.onne.t-
ing rcd must be tepla.ed.
PISTON PIN BEARING
Figure l2-7, Check Rod Beaingt
ASSEMBLE PISTON AND CONNECTING ROD
Lubric:te parts with engine oil and assemble *1 piston and
connecting rod, Figure 12-8.
l.Notch or casting mark on piston must be on flywheeJside.
2-Number " 1 ' on connecting rod must face PTO side (oppo-
site notch or casting mark on piston).
d l,rstallpinon
pi,r locG with needle rose pliers.
Lubricate parts with engine oil and assemble #2 piston and
connecting rod, Figure 12-9.
l.Notch or casting mark on piston must be on fly\,vheelside.
2.Number '2' on connecting rod mustface PTO side (oppo-
site notch or casting mark on piston).
a.Installpiston pin locks with need e nose piiers.
CRANKPIN BEAFING
12-2