Service Manual

the crankcase. Use a seal pick to remove the
governor shaft seal.
NOTE: The cylinder contains a cast iron sleeve,
however, this sleeve is not replaceable. The
purpose of the sleeve retainer ring is to assist the
manufacturing process and hold the cast iron
sleeve in place to limit engine damage should
the sleeve loosen during operation.
Engine Assembly And Repair
NOTE: Before attempting to reassemble the engine
refer to the Service Data Specifications (page IV-4)
and replace all parts which are outside the recom-
mended values.
1. Ensure there are no burrs on the governor
shaft which could cause seal damage and
position the governor shaft through the hole
in the crankcase casting. Use a liberal
amount of
#2 grease and install the governor
shaft seal with the lip towards the inside of
the crankcase. Position the flat washer on
the governor shaft against the shaft seal and
install the E-ring.
2. Install the two piston rings onto the piston.
The chrome surfaced ring should be posi-
tioned at the top of the piston. There is a
small letter
‘R” stamped on the top side of
each piston ring. This letter should face the
top of the piston.
If the piston ring is put in
upside down it
will not seat properly in the
ring groove. Lubricate the wrist pin needle
bearing with two-cycle oil and insert into the
connecting rod. Position the piston over the
connecting rod and insert the wrist pin
through the piston, needle bearing and pis-
ton rod. Insert the spring retainers to lock the
wrist pin in place.
IMPORTANT: THE ARROW CAST INTO THE
TOP
OF THE PISTON MUST FACE THE
EXHAUST PORT WHEN ASSEMBLED.
3. Lubricate the moving parts and friction sur-
faces
of the crankshaft and piston with two-
cycle oil. Rotate the piston rings until the ring
gap aligns with the locating studs before
attempting to push the piston into the
cylinder. Insert the crankshaft and piston
assembly into the cylinder.
IMP0RTANT:ASSURETHEARROWONTOP
OF THE PISTON FACES EXHAUST PORT
WHEN ASSEMBLED.
4. Lubricate the large end of the crankshaft
with two-cycle oil and install the sliding
governor collar. Insert the small locating pin
into the crankshaft and slide the flywheel
collar into position. Position the fly weights
on the lip of the governor collar and locate
the control shaft between the collar and the
crankshaft assembly (See Figure 2-1
3 and
4-2). Lubricate the crankshaft bearings with
two-cycle
oil and install onto either end of the
crankshaft. Insert the bearing locating rings
into the slots of the crankcase housing to
locate the bearings and crankshaft in position.
n
Removeburrsfromeitherendofthecrankshaft
and slide seals into position. To prevent seal
damage on installation use a small amount of
#2 grease on the inside diameter of the seal.
Both seals should be installed with the lipfac-
ing into the crankcase assembly.
r-
Figure 4-2
5. Assure both halves of the crankcase are clean
and free of grease and old sealant. Apply a thin
uniform amount of Threebond #1104
or Loc- P
tite #515 sealant to the mating surfaces and
position of the crankcase halves together.
6. There are three different size capscrews on
the model 47PZ2 to hold the crankcase halves
together.(Thecapscrewson the47PD3,47PE4
and 47PF5 are all the same length). Starting on
the governor control shaft side install the
two
medium sized capscrews at either end. Install
one short capscrew and governor spring
bracket in thecenter hole. Install the other
two
remaining short capscrews into the other side
in the center hole and the hole nearest the
large end
of the crankshaft. Install the long
capscrew in the remaining hole. Torque all
capscrews evenly
80-95 Kg-Cm (70-1 10 in-lb).
See Figure 4-3. Position the engine mower
47P22 Only
Torque Capscrews to 80-95 KaCm (70-1 10 in-lb).
Figure 4-3
IV-3