Bosch DIE 165 R User Manual download pdf (Page 20)

165R

Cylinder,piston 0

Inspection

FAULT

REMEDY

Broken cooling fins

Damaged threads

Binding marks in cylinder wall (particularly

at exhaust port)

Surface coating on cylinder wall worn (chiefly at top

of cylinder)

Binding scratches on piston

In serious cases – change the cylinder.

Repair the threads with HeIi-Coil inserts.

Clean the damaged area with fine emery cloth to remove

adhering aluminium. In the case of deeper binding scrat-

ches the cy/inder and piston should be rep/aced.

Change cylinder and piston.

Clean the damaged area carefully with a fine file or emery

cloth. Clean the cylinder carefully as described above

before fitting the piston back in place. In the case of

deeper scratches the piston and possibly the cylinder

should be changed. Before assembly, clean both piston

and cylinder carefully to remove all metal filings.

1 Piston ring burnt in its groove

Carefu//y remove the piston ring and clean the groove

with extreme thoroughness before reassembly.

Piston ring worn

Check the wear by positioning the ring in the lowest part

of the cy/inder. The distance between the ends of the

piston ring should not exceed 0.6 mm. Also check that the

piston ring has lost none of its springiness.

Assembly

Check that the piston and cylinder are marked with the

Use a suitable drift to centre the piston opposite the

same class designation (see Fig. 1:1and the classifica-

tion table).

needle bearing in the connecting-rod. Slide the gudgeon

pin into position and fit the circlips in place. Check that

Fig 6:4

Fig 6:5

Check that the gudgeon pin needle bearing is not dama-

ged or worn. Fit it in the connecting rod and lubricate

with a few drops of two-stroke oil.

Fit the piston to the connecting-rod.

NOTE: The arrow on the piston crown should point to-

ward the exhaust port.

they are correctly seated in their grooves by rotating

them with a pair of flat-nosed pliers.

Lubricate the piston with a few drops of two-stroke oil.

Place the cylinder gasket in position on the crankcase.

Position the plastic support in assembly kit No. 50250

70-01 under the piston.

6:2

For Husqvarna Parts Call 606-678-9623 or 606-561-4983

www.mymowerparts.com

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Bosch DIE 165 R User Manual Page 20

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