Briggs & Stratton 405777 Series - Piston Pin and Connecting Rod Check

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CHECKING PISTON PIN AND
CONNECTING ROD
1. Check piston pin, Fig. 6.
a. Replace if less than .6718” (17.06 mm) or .0005”
(.01 mm) out of round.
Fig. 6 − Check Piston Pin
2. Check connecting rod bearings.
Note: If crankpin bearing is scored or worn the connecting
rod must be replaced.
Connecting Rod Reject Size
Crankpin Bearing Piston Pin Bearing
1.5015” (38.13 mm) .6745” (17.13 mm)
Note: .020” undersize connecting rods are available for
use on a reground crankpin journal. See illus-
trated parts list.
Fig. 7 − Check Rod Bearings
CRANKPIN BEARING
PISTON PIN BEARING
ASSEMBLE PISTON AND
CONNECTING ROD
Lubricate parts with engine oil and assemble #1 piston and
connecting rod, Fig. 8.
1. Arrow on piston must face flywheel side.
2. Number ‘‘1” on connecting rod must face PTO side (op-
posite arrow on piston).
a. Install piston pin locks with needle nose pliers.
Fig. 8 − Assemble #1 Rod And Piston
#1
ARROW TOWARD
FLYWHEEL SIDE
Lubricate parts with engine oil and assemble #2 piston and
connecting rod, Fig. 9.
1. Arrow on piston must face flywheel side.
2. Number ‘‘2” on connecting rod must face PTO side (op-
posite arrow on piston).
a. Install piston pin locks with needle nose pliers.
ARROW TOWARD
FLYWHEEL SIDE
Fig. 9 − Assemble #2 Rod And Piston
#2
TSM