Pistons - Tecumseh V-twin Technician's Handbook

PISTONS, RINGS, AND CONNECTING
RODS
PISTON
Specification
Piston Diameter
Pin (Piston) Diameter
Piston Pin
Bore Diameter
Piston Ring Grooves
Top and Center
Piston Ring Groove
Bottom
Clean all carbon from the piston top and the ring grooves
before measuring. Visually inspect the piston skirt area
for scoring or scratches. If scoring or deep scratches
are evident, replace the piston. The pistons should be
checked for wear by measuring near the bottom of the
skirt 90 degrees from the piston pinhole. (Illust. 7-23)
PISTON MEASUREMENTS ARE TAKEN AT
BOTTOM OF SKIRT 90
7-8
English Std. Metric
3.1220 79.2988
3.1235 79.3369
.6248 15.870
.6251 15.878
.6257 15.893
.0645 1.638
.0665 1.689
.1255 3.189
.1275 3.239
INDICATES .010
OVERSIZE PISTON
FROM WRIST PIN HOLE
0
If the cylinder bore needs re-sizing, an oversize piston
will be necessary. Oversize pistons are identified by the
decimal oversize value imprinted on the top of the piston.
(Illust. 7-24)
Check the piston ring, side clearance using a feeler gauge
and a new ring. (Illust. 7-25)
7-23
7-24
7-25