Reassembly; Installation On Drive Tube - Toro 51643 Service Manual

Engine Reassembly (cont'd)
Install the four screws with lock washers to secure
the crankcase halves together. Tighten the screws
to 0.4 to 0.5 kg m (35 to
43
in Ibs)
10. Install the cylinder upon the crankcase.
Position the cylinder gasket upon the crankcase.
Make sure the pulse hole opening in the gasket
lines up with the crankcase opening. Lightly
lubricate the bore
of
the cylinder with clean engine
oil and carefully slide the cylinder down the piston
and onto the crankcase. Note that the exhaust port
is on the right when the engine is viewed from the
recoil starter end.
IMPORTANT The piston rings are aligned with
locating pins. Make sure that the end gap is
aligned with these pins when inserting the
piston into the cylinder.
11 Secure the cylinder onto the crankcase with the
two hex head screws with lock washers. Tighten
the fasteners to 0.4 to 0.5 kg m (35 to
43
in Ibs).
12. Install the spark plug into the cylinder. Make certain
the spark plug gap is set to .6 to .7 mm (.024 to
.027").
13. Screw on the starter pulley and secure with the nut
and the washer. Tighten to 1.0 to 1.3 kg m (87 to
113 in Ibs).
14. Install the recoil assembly as described under
Recoil Mechanism Installation, page 32.
15. Install the flywheel, clutch shoes, tank and coil as
described under Clutch Shoes and Flywheel
Reassembly, page 36.
16. Install the muffler and muffler cover.
17. Install the carburetor and air cleaner as described
under Carburetor Installation, page 18.
Engine Installation on Drive Tube
1.
Remove the locating screw from the clutch
housing and mount the engine on the tube.
NOTE:
It may be necessary to turn the trimmer
implement slightly to get the flex shaft and clutch
drive shaft to mate.
2. Align the holes in the clutch housing and the drive
tube and install the locating screw. Tighten the
locating and clamping screw.
3. Feed the throttle cable through the throttle control
grip and insert the end into the recess in the trigger.
4. Place the switch
in the throttle control
housing.
Test for proper operation of the switch. The switc
should be open in the "on" position and closed in
the "off position.
5. Mate the
two throttle control
case halves and
secure with the two machine screws.
6.
Route the throttle cable and switch wires from the
carburetor over the top of the tube. See Figure
107.
ROUTING
Figure 107
7. Plug the
two
wires into the female connectors in
the throttle control. They may be connected either
way as the ignition switch has no certain polarity.
8.
Adjust the carburetor as described under
Carburetor Adjustment, page 19.
45