Shindaiwa 357 Manuel de service télécharger pdf (Page 73)

Q Shindaiwa Inc. 1995 73

Cylinders and Pistons Section 7

Inspection Cylinder Bore

Shindaiwa hard-chrome plated cylinders

cannot be bored for reuse, and oversize

pistons are likewise not available.

The cylinder bore plating is extremely

durable, however, and will often withstand

even a total engine seizure.

Suggested Cleaning Procedure

STEP 1. Aluminum deposits adhering to

cylinder walls can often be removed with a

full-strength treatment of muriatic acid

(concrete cleaner).

STEP 2. Stubborn or glazed-over deposits on

cylinder walls can be loosened by light

sanding

across

the bore with a small

section of emery cloth.

WARNING!

Wear eye and skin protection when

working with acids. Follow manufacturer’s

instructions as to additional safety and

disposal precautions.

ATTENTION!

Apply the acid to chrome surfaces only!

Never allow acid to contact aluminum

components, as deterioration will be

immediate!

Use a telescoping gauge and micrometer

to measure cylinder bore diameter and taper.

Compare your readings with the Tolerances

and Wear Limits given in the Appendix. See

Figure 7.9.

Replace any cylinder exhibiting visible

damage or with measurable wear beyond the

tolerances listed in the Appendix.

IMPORTANT!

■ Never install a used piston in a new

cylinder!

■ Always verify cylinder condition before

reassembly.

■ Never attempt to install a new piston in

a used cylinder that has been dam-

aged, distorted, or is worn beyond

specified tolerances.

Figure 7.9 Measuring Cylinder Bore Wear

Measuring

Diameter

Measuring

Taper

Telescoping

Gauge

CYLINDERS/PISTONS

1 2 ... 68 69 70 71 72 73 74 75 76 77 78 ... 137 138

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