Toro Lawn-boy - Service Tips; Disassembly

41
ENGINE
Service Tips
1. Cylinder/Crankcase Halves
The two halves are a matched pair and cannot be
exchan
g
ed between en
g
ines. Follow all cleanin
g
and assembly procedures in this subsection. Be
sure to use Loctite 515 on the matin
g
surfaces.
Torque the six screws that secure the two halves.
See specifications.
2. Oil Seal
Visually inspect for leaky or dama
g
ed oil seals (two
locations). See the Seal Service section for the
procedure.
3. En
g
ine Base/Muffler Baffle (Lawn mower only)
This item should be checked and/or cleaned every
100 hours (maximum) to keep carbon from
clo
gg
in
g
exhaust system (power loss) and from
enterin
g
en
g
ine (causin
g
piston scorin
g
). See
Cleanin
g
Exhaust, see pa
g
e 15.
4. Exhaust Ports
The exhaust ports should be inspected and
cleaned as necessary (see pa
g
e 15.)
5. Carburetor Gaskets
Carburetor
g
askets on either side of the carburetor
shield may be leakin
g
or dama
g
ed causin
g
air
leaks into the en
g
ine (may cause power
fluctuations). Ensure that air cleaner/carburetor
mountin
g
screws are properly ti
g
htened (see
Specifications).
Disassembly
Removal of the shroud, recoil starter, flywheel, i
g
nition
coil, and carburetor are covered in other parts of this
book and will not be repeated here.
1. Remove the six crankcase cap screws, and
separate the halves usin
g
a screwdriver. (See
Fi
g
ure 70.) Be careful not to dama
g
e the sealin
g
surfaces.
2. Remove the entire crankshaft assembly, and
discard the oil seals.
Fi
g
ure 70
1657-012
3. Carefully remove the HSH (hex, socket head) cap
screws (A) (see Fi
g
ure 71) to remove the
connectin
g
rod cap and the split bearin
g
liner. The
needle roller bearin
g
s are under the split bearin
g
liner. (See Fi
g
ure 72.)
Fi
g
ure 71
0720-013
A