Husqvarna 965030296, 965030298, 1018855-26 manual Piston And Cylinder, Cleaning and Inspection

PISTON AND CYLINDER

Cleaning and Inspection

Clean all parts, scrape off any gasket residue remove carbon deposits from the following areas:

1.The piston crown.

2.The top of the cylinder bore.

3.The cylinder exhaust port.

4.The decompression valve channel.

Check the following:

1.That the cylinder’s surface coating is not worn, especially the upper part of the cylinder.

2.That the cylinder is free of score marks.

3.That the piston is free of score marks. See ”Faults and causes” on the next page. Small scratches can be polished off using fine emery paper.

4.That the piston ring is not stuck into its groove.

5.Measure the piston ring wear by placing it in the bottom of the cylinder bore and measuring the gap and which should not exceed 1 mm.

6.That the needle bearing is undamaged.

7.That the intake manifold is undamaged.

Max 1 mm

Pressure test the decompression valve as follows:

1.Connect the tool 502 50 38-01 to the decompression valve

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

3.Wait 30 seconds.

4.The pressure should not drop below 60 kPa (0.6 bar).

English – 109