Briggs & Stratton Vanguard 430000 User Manual page 59

Assemble Piston and Connecting Rod
1. Assemble piston to connecting rod using
Piston Pin Fixture #19419.
NOTE: Arrow on piston (A, Figure 10) and ID mark
(B) on rod must face same side.
2. Lubricate piston pin with engine oil. Then,
insert threaded driver (C) through piston pin
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(D) and thread into pilot (E).
3. With arrow on piston and ID mark on rod
facing up, insert pilot through piston and
connecting rod.
Figure 10
4. Insert piston pin stop (A, Figure 11) in bottom
of piston support (B).
Figure 11
5. With arrow on piston up, place assembly onto
support.
6. Press in piston pin until pilot bottoms on stop.
7. After assembly, make sure the piston rotates
freely on connecting rod.
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Assemble Piston Rings to Piston
1. Install oil ring expander first.
2. Spiral bottom oil control ring into top ring
groove, center ring groove, and then into
position below expander (Figure 12).
3. Repeat for upper oil control ring.
Figure 12
4. Using ring expander, install center
compression ring then, top compression ring
with ID marks up (Figure 13).
5. Stagger ring end gaps.
6. Rotate oil control ring ends 180° from each
other.
Figure 13