Check Piston Ring Groove Wear; Check Piston Ring End Gap; Check Connecting Rod; Undersized Connecting Rods - Briggs & Stratton 5 HP Troubleshooting & Repair Manual

1. Grasp one end of the steel rail and wind the rail from
the oil ring groove into the next ring groove.
2. Repeat into the top ring groove and then off the
piston.

Check Piston Ring Groove Wear

1. Clean carbon from top ring groove.
2. Place a new ring
measure space between ring and ring land. If the
measurement is .007" (.18mm) or greater, reject the
piston.
Figure 67 — Measuring Ring Groove Wear

Check Piston Ring End Gap

4
1. Clean all carbon from the end of the rings, and from
the cylinder bore.
2. Insert old rings
(Figure 68)
down into the cylinder
Figure 68 — Ring End Gap
in groove and
(Figure 67) 2
2
one at a time one inch
3
.
3
4
5 HP Outboard • Troubleshooting & Repair Manual
3. Check end gap with feeler gauge
4. Replace the piston ring if the ring end gap is greater
than:
Top Compression Ring
Center Compression Ring
Oil Control Ring

Check Connecting Rod

If the crankpin bearing is scored, the rod must be replaced.
Reject size of the crankpin bearing
in. (27.99mm) or greater. Reject size of the piston pin
bearing is .627 in. (15.93mm) or greater.
2
Figure 69 — Connecting Rod Bearings
2

Undersized Connecting Rods

Undersized connecting rods .020" (.51mm) are available if
crankpin is scored or worn below reject. Check illustrated
parts list for part number availability.
1. Grind crankpin
(Figure 70)
dimensions:
40
Section 4 • Overhaul
.
4
.020 in. (.51mm)
.030 in. (.76mm)
.035 in. (.89mm)
is 1.102
(Figure 69) 1
1
to the following