Husqvarna 340, 345, 346XP,350, 351, 353 Piston and cylinder - refitting, Repair instructions

Repair instructions

Piston and cylinder – refitting 340, 345

1-5

See Piston and cylinder 346XP, 350, 351, 353 – Refitting points 1-5.

6

Apply silicone adhesive/sealing compound (03- 7062) to the crankcase’s contact surfaces with the cylinder.

Carefully slide the cylinder down over the piston towards the big end bearing.

Note!

Work is facilitated if the crankshaft complete with bearing and piston is released from the crankcase and the piston is pushed into the cylinder. The unit is then refitted in the crankcase.

7

Fit the cylinder bolts, tightening crosswise to a torque of 13–15 Nm.

8

Pressure test the cylinder.

9

Refit:

•spark plug, tighten to a torque of 15 Nm

•carburettor, see “Carburettor – refitting”,

•silencer, tighten to a torque of 8–10 Nm

•cylinder cover

NOTE!

If a new piston or cylinder has been fitted the saw must be run for the first 3–4 hours with carburettor adjusted to the factory settings.

Cylinder – pressure testing

•Loosen the carburettor bolts so that the carbu- rettor can be moved back about 4 mm. Insert cover plate 502 54 11-02 between the carburet- tor and the carburettor flange. Tighten the carburettor bolts to a torque of 1–1.5 Nm.

•Loosen the silencer bolts so that the silencer can be moved back about 4 mm. Insert cover plate 502 54 11-02 between the silencer and the exhaust flange on the cylinder flange. Tighten the silencer bolts to a torque of 8–10 Nm.

•Unscrew and remove the spark plug. Screw in pressure test nipple 503 84 40-02. Connect tool 502 50 38-01 to the nipple. The decompression valve must be closed. The decompression valve must be closed. To check the decompression valve itself, see “Decompression valve – pres- sure testing”.

•Pump up the pressure to 80 kPa (0.8 bar).

•Wait 30 seconds.

•The pressure should not be less than 60 kPa (0.6 bar).

•Remove the cover plates from the silencer and carburettor, tighten the bolts to the specified torque. Remove the pressure test nipple 503 84 40-02 and refit the spark plug.

WARNING!

After pressure testing the cylin- der, check that the inlet manifold is seated correctly, otherwise the saw may be damaged.

44 – English