Disassembly. Repair. Reassembly Instructions; Trimmer Engine Removal. Disassembly. Replacement - Toro 51603 Maintenance And Repair Manual

DISASSEMBLY,
REPAIR,
REASSEMBLY INSTRUCTIONS
Trimmer Engine Removal, Disassembly,
Replacement
1. Drain the gas from the trimmer gas tank and
remove the spark plug high tension wire.
2. Remove the air cleaner cover by pressing up on
the bottom of the cover to release the lower
mounting tab, and pressing in on the front of the
cover to release the upper tab.
3.
With the trimmer on its left side, remove the
nine Phillips head screws which attach the case
halves together. NOTE: A service fixture, plans
for which are described in Gasoline Trimmer
Service Bulletin No.81-05, is very useful for
supporting the trimmer for disassembly and
reassembly.
4. Remove the right hand case half by lifting
it
from
the left hand case half. The case half may
appear to be stuck to the engine due to the fit of
the rubber engine isolation mounts between the
case and the engine backing plate. NOTE: When
reassembling, install the rubber isolation
mounts
in
the case halves rather than on the
engine backing plate.
5. Remove the engine housing tube and recoil
starter assembly by tipping the engine to the
rear and lifting the tube and starter from the left
hand case half.
6. IMPORTANT: Note how the fuel line, throttle
lever, throttle link, spring, switch, and wiring
harness are routed and attached (Fig. 18).
Engine
Mounting Block
7.
Figure 18
Remove the gas line from the carburetor inlet by
compressing and sliding the fuel line clamp up
onto the fuel line and twisting and pulling on the
fuel line.
10
8. Remove the throttle and switch, assemblies and
Iift, the engine from the Left Hand Case.
I
clip.
9. Remove the air cleaner elements and retaining
10, Remove the carburetor by removing the Phillips
head screws which pass through the spit back/
choke assembly and carburetor.
11. Remove the cooling shroud halves by removing
the three screws which attach the shroud to the
backing plate, and gently prying open the latch
next to the spark plug wire. NOTE: The TC300
and TC400 have a single piece cooling shroud.
12. Remove the flywheel by retaining the starter
cup with the starter cup wrench P/N45-1390)
and removing the flywheel nut (Fig. 24, p. 17).
Use the handle of the starter cup wrench to
separate the flywheel from the crankshaft taper.
The two holes cast into the flywheel should be
tapped with a
l/4"-20
tap, and two 1/4"-20 x 3/4"
long capscrews used to apply pressure against
the: crankshaft end until the seat between the
flywheel and crankshaft is loosened.
CAPTION: DO NOT attempt to pry the flywheel
from the crankshaft or tap on the crankshaft end
to loosen the flywheel. The crankshaft is made
up of three parts, with the crankshaft ends being
pressed onto the crankpin. Prying or striking the
crankshaft can result in damage that will require
replacement of the short block.
13. Remove the CDI (Ignition) Module by removing
the' two screws which attach the laminations to
the' cylinder assembly.
14. Remove the backing plate assembly by removing
the three bolts and two Phillips head screws
which pass through the backing plate and back-
ing'plate stress plate into the cylinder assembly.
NOTE (TC1500 only): The intake gasket is sealed
with a light coating of gasket sealant, and the
backing plate may appear to be stuck to the
cylinder assembly.
15. Remove the crankcase pad by squeezing the end
of the crankcase pad clip so that
it
can be passed
through the hole in the crankcase.
16. Remove the heat shield and muffler by removing
the' two hex socket capscrews and the Phillips
head screw to the heat shield tab. The tab can
then be removed by removing the Phillips head
w that fastens
it
to the cylinder assembly.