Check Piston Pin And Piston Pin Bore; Inspect Crankshaft - Briggs & Stratton 5 HP Troubleshooting & Repair Manual

5 HP Outboard • Troubleshooting & Repair Manual
Section 4 • Overhaul
Figure 70 — Crankpin Dimensions
T
Crankpin diameter (A)
(R)
Fillet Radius
(T)
Crankshaft Throw

Check Piston Pin and Piston Pin Bore

If piston pin is worn .001" (.03mm) out of round, or if it is
under .624 in. (15.85mm), it should be replaced. Oversize
piston pins are available for some models. Check the
illustrated parts list for part number availability.
Replace the piston if the piston pin bore
.627 in. (15.93mm) or greater.
Figure 71 — Piston Pin Bore
R
A
1.078 - 1.079 in.
(27.39 - 27-41mm)
.069 - .079 in.
(1.75 - 2.01mm)
1.020 in.
(25.91mm)
is
(Figure 71) 3
3
41

Inspect Crankshaft

CAUTION
: Always replace a bent crankshaft.
1. shows wear points to be checked on
Figure 72
crankshaft. Discard crankshaft if worn smaller than the
following minimum diameter specifications. Mag
journal
(Figure 72) 1
journal 1.060 in. (26.92mm)
5
Figure 72 — Crankshaft Wear Points
3
1
2
2. Resize the crankpin journal if worn smaller than the
following minimum diameter. Crankpin journal
1.097 in. (27.86mm)
3. Inspect keyway . Replace the crankshaft if the
2
keyways show wear or spreading. Remove burrs from
keyway edges to prevent bearing damage.
4. Check timing gear
4
Check the gear keyway for wear. Replace gear if
damaged.
.873 in. (22.17mm) PTO
5
4
3
for chipped or cracked teeth.
4