Assemble Rings To Piston; Install Piston And Connecting Rod Assembly - Briggs & Stratton Twin Cylinder L-Head Repair Manual

The piston pin is a slip fit in both piston and connecting
rod. Oil piston pin. Place a piston pin lock in groove on
one side of piston. Insert piston pin from opposite side
of piston until pin stops against piston pin lock, Fig. 2
Use a needle nose pliers to assemble piston pin lock in
lock groove. Be sure both locks are firmly set in
grooves.

Assemble Rings to Piston

Use ring expander, Tool #19340, when installing piston
rings.
IMPORTANT: All Models 400000, 420000 and pres-
sure lube Model 460770 are equipped with an oil ring
and polygonal expander as shown in Fig.11. Install
expander and oil ring first. The second compression
ring has a dot mark which must face the top of piston.
Install center ring, then, top ring.
Splash lube Models 460700 are equipped with an oil
ring with a coil expander as shown in Fig. 12. Install coil
expander and oil ring first. The second compression
ring has a dot mark which must face the top of piston.
Install center ring, then, top ring.
Install Piston and Connecting Rod
Assembly
Oil piston rings, piston skirt and inside of ring
compressor. Place ring compressor, Tool #19230, over
piston with projections on compressor towards con-
necting rod, Fig. 13.
Place piston and ring compressor upside down on
bench and push down until head of piston and edge of
ring compressor are even. Tighten ring compressor
until rings are fully compressed. Then loosen ring
compressor very slightly so that compressor can be
rotated on skirt while holding connecting rod.
12
All Models 400000-420000 & Pressure Lube – 460770
TOP
NOTE DOT MARK
CENTER
OIL
Fig. 11 – Piston Ring Installation
Splash Lube Model 460700
TOP
NOTE DOT MARK
CENTER
OIL
Fig. 12 – Piston Ring Installation
COMPRESSOR SHOULD BE ABLE TO ROTATE
WHILE HOLDING CONNECTING ROD
PROJECTIONS
Fig. 13 – Compressing Rings
POLYGONAL EXPANDER
INSTALL BEHIND OIL RING
COIL EXPANDER
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