Briggs & Stratton 700 DOV Series, Repair Manual

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4
11
Remove Piston and Connecting Rod
1. Carefully remove any carbon or ridge at
top of cylinder bore ( A , Figure 11-1) to
prevent ring breakage.
2. Remove rod bolts ( B ) and connecting rod
cap ( C ).
3. Push piston ( D ) and connecting rod ( E ) out
through top of bore.
Disassemble
1. Using pliers, rotate piston pin clip ( F ) until
one end is exposed in notch in pin bore
(
G ), then remove clip.
2. Slide out piston pin ( H ) and remove
connecting rod from piston.
3. Using Piston Ring Expander #19340,
remove the compression ring ( J ) and the
wiper ring ( K ).
NOTE: Identify the top side of each ring before
removal.
4. The oil control rings ( L ) consist of two thin
steel rails and a spring expander. These
must be removed by hand as follows:
• Grasp one end of the upper steel rail and
wind the rail from the oil ring groove into
the center ring groove. Repeat into top
ring groove and then off the piston.
• Remove the spring expander then
remove the lower steel rail.
Inspect
Check Piston and Pin
1. Inspect piston for scoring, galling, or other
damage. Replace piston if necessary.
2. Using a dial caliper or plug gauge,
measure the pin bore diameter in the
piston. Compare with reject dimensions
listed in Section 12 - Engine
Specifications. If pin bore meets or
exceeds reject dimension, replace the
piston.
3. Measure outside diameter of pin and
compare to the reject dimensions listed in
Section 12 - Engine Specifications. If pin
meets or exceeds the reject dimension,
replace the pin.
4. Clean any carbon from the top ring groove
in piston. Place NEW ring in groove and,
using a feeler gauge, measure the
clearance between ring and ring land
(Figure 11-2).
5. Repeat procedure for wiper ring groove
and oil control ring groove.
6. Compare with reject dimensions listed in
Section 12 - Engine Specifications. If
clearance meets or exceeds the reject
dimensions, replace the piston.
Figure 11 - 2
Check Connecting Rod
If either the crankpin bearing or the piston pin
bearing is scored or discolored, the rod must be
replaced.
1. Reinstall rod cap and bolts on rod. Tighten
bolts until snug.
2. Using a dial caliper or plug gauge,
measure the two bearing diameters.
Compare with reject dimensions listed in
Section 12 - Engine Specifications. If
either bearing meets or exceeds its reject
dimension, the rod must be replaced.
3. Remove rod bolts and rod cap. Set aside.
Check Ring End Gap
It is recommended that the entire ring set be
replaced when servicing the piston and/or
cylinder bore. However, the original rings can be
re-used if they are not damaged and are
checked as follows: