Shindaiwa 357 Service Manual download pdf (Page 78)

Q Shindaiwa Inc. 1995

78

Section 7 Cylinders and Pistons

Reassembly

(Continued)

STEP 3. Orient the cylinder over the piston,

and align the cylinder exhaust port with the

arrow on the piston crown. While using a

ring compressor (or finger pressure) to hold

the piston rings in their grooves, carefully

slide the cylinder over the piston.

ATTENTION!

Do not rotate the cylinder on the piston!

Rotating the cylinder may fracture the

piston rings in the cylinder ports, possibly

damaging the cylinder bore.

STEP 4.

All Models (except 695 and 757) Apply

ThreeBond p/n 1360 to the threads of each

of the four cylinder base mounting screws,

and then loosely assemble the cylinder to

the crankcase. Tighten each screw only

until it just contacts the cylinder base, less

about 1/2–3/4 turn.

Models 695 and 757 Using four new

precoated cylinder base mounting screws,

loosely assemble the cylinder to the

crankcase. Tighten each screw only until it

just contacts the cylinder base, less about

1/2–3/4 turn.

Cylinder Alignment

STEP 1. Place one hand on the cylinder as

shown, and then center the cylinder in the

crankcase by slowly rotating the crankshaft

while checking for binding between the

piston and cylinder. If necessary, move the

cylinder slightly until the piston can travel

freely in the cylinder bore (Figure 7.21).

STEP 2. Once the cylinder has been properly

centered, hold it firmly in place on the

crankcase while hand-tightening the

cylinder base screws.

IMPORTANT!

Failure to properly center the cylinder can

increase stresses on internal engine

components, causing lowered engine

performance, increased wear, and higher

operating temperatures.

Torquing

Use an accurate torque wrench to final-tighten

the cylinder base mounting screws to the

correct per-model specifications (Figure 7.22).

Figure 7.22 Totque All Mounting Bolts

CYL-52

Figure 7.21 “Centering” the Cylinder in the Crankcase

Cylinder Base Torque Values

Saw Cylinder Torque

Model Screw p/n in/lbs (Kg/cm)

300, 300S,

360, 377

22154-12130 61-70 (70-80)

488 22157-12130 61-70 (70-80)

575,577,

680, 695

22155-12190 70-80 (80-90)

757 22169-12190 78-104 (90-120)

CYLINDERS/PISTONS

1 2 ... 73 74 75 76 77 78 79 80 81 82 83 ... 137 138

Comments to this Manuals

No comments