Cylinder And Cylinder Head Service; Reboring; Cylinder Head - Tecumseh VLV Technician's Handbook

CYLINDERS AND CYLINDER HEADS
CYLINDER SERVICE. Check cylinder for dirty, broken
or cracked fins, worn or scored bearings or scored
cylinder bore surface, and warped head mounting
surface.
If cylinder bore is worn more than .005'' oversize, out-of
round or scored, it should be replaced or rebored to
.010 or .020 oversize. In some cases engines are built
with an oversize cylinder; in these instances they are
identified with the oversize value imprinted on the
cylinder as pictured. Service pistons have the oversized
valve marked on the dome.
INDICATES .010 OVERSIZE PISTON
.010
REBORING CYLINDER. To rebore cylinder we
recommend using a reputable machine shop or service
center.
Then hone the cylinder with 380 grit stone to obtain a
good cross hatch pattern for proper ring seating.
Clean cylinder with soap and water, and dry thoroughly.
Replace piston and piston rings with correct oversize
parts as indicated in parts manual.
26
Chapter 9
Not For Resale
www.SmallEngineDiscount.com
CYLINDER HEADS. Check cylinder heads for warpage
by placing on a flat surface. If the cylinder head gasket
surface is warped in excess of .005 inches (.13 mm),
replace head. Always replace head gasket and torque
head bolts in 50 inch lb. increments in the numbered
sequence to a torque of 180-220 inch lbs. (20.3 - 25
nm)
TORQUE IN NUMERICAL ORDER
2
6
4
7
1
5
3