6
55
64
B. Since the grooves wear unevenly, repeat this
check at several locations around the piston ring
groove circumference.
C. Discard the piston if any measurement is
0.010
inches
(0.25 mm) or more.
NOTE:
Only the top compression ring side clearance
needs to be checked.
Piston Rings
NOTE:
Always use
new
piston rings. Recondition
(deglaze) or resize (hone) cylinder before installing new
rings.
1. Before placing each ring on the piston, perform the
following check.
NOTE:
Insufficient ring end gap may cause the ends
to abut at engine operating temperatures, resulting
in ring breakage, cylinder scuffing and/or piston
seizure. Excessive ring end gap results in high oil
consumption and blow-by of exhaust gases. Blow-
by of exhaust gases contaminates the engine oil
supply, and reduces engine efficiency by weakening
the combustion seal necessary for efficient transfer of
energy to the piston.
A. Obtain
new
top compression ring.
B. See Figure 65. Insert ring approximately one inch
(25.4 mm) into cylinder bore.
C. Square ring in the bore using the top of the
piston.
D. Measure the ring end gap with a feeler gauge.
E. Do not use the top compression ring if the end
gap is
0.039 inches
(0.99 mm) or more.
F. Repeat steps 1(B) thru 1(D) using
new
middle oil
wiper ring. Do not use the ring if the end gap is
0.065 inches
(1.66 mm) or more.
65
G. Repeat steps 1(B) thru 1(D) using rails of
new
oil
control ring. Do not use the ring if the end gaps
are
0.074 inches
(1.89 mm) or more.
Connecting Rod
1. Inspect the connecting rod for cracks, twisting or
bending.
2. Inspect bearing surfaces for scratches or scoring.
3. Inspect dipper on connecting rod cap for bending,
chipping, or cracking.
NOTE:
Replace connecting rod and cap if any of
the above conditions are found. Always replace
connecting rod and cap as an assembly.
4. Start two hex flange screws to fasten connecting rod
cap to connecting rod. Alternately tighten screws to
90-110 lb-in
(10.2-12.4 N-m).
66
Not for
Reproduction
Summary of Contents for Vanguard 10V300
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