Generac Power Systems MC User Manual
Page 76
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3.3.2.5-PISTON
measure piston
Piston diameter
3
.
067
” -
3
.
068
”
Clean carbon from piston ring gro
oves, as well as from upper cylinder
bore and head» Check piston dimensi
ons, as shown above. Replacement pi
stons are available in 3 sizes -
standard, 0,25 mm oversize and 0.50
mm oversize.
Check for proper width of compression
and oil ring grooves on piston. See
illustration above.
3.3.2.6- RINGS
Replace rings in sets. During installation ring gaps must be staggered,
Before installing new rings, deglaze cylinder walls thoroughly with
fine emery cloth and clean thoroughly. Rings are available in standard
size, as well as oversize to match the oversize pistons that are avail
able.
____________________________
Check for proper clearance of
compression and oil control rings
in piston grooves. See illustration
at right.
3.3-6