Skoda Workshop Service and Repair Manuals

Inspect piston, piston rings and cylinder bore

Inspecting piston ring gap clearance Special tools and workshop equipment required t  Feeler gauge –  Insert ring at right angles from above down into lower cylinder opening, about 15 mm away from edge of cylinder. To insert use piston without rings.

Piston ring dimensions in mm	New	Wear limit
1. Compression ring	0,20 …0,40	1,0
2. Compression ring	0,40 …0,60	1,0
Oil scraper ring	0,20 …0,8	no wear indication possible

Inspect piston ring end clearance Special tools and workshop equipment required t  Feeler gauge –  Clean ring groove before inspecting.

Piston ring dimensions in mm	New	Wear limit
1. Compression ring	0,04 …0,08	0,15
2. Compression ring	0,02 …0,06	0,15
Oil scraper ring	cannot be measured

Inspecting pistons Special tools and workshop equipment required t  External micrometer 75...100 mm –  Measure about 12 mm from the lower edge and vertically offset to piston pin axis. l  Deviations from specified dimension: max. 0.04 mm

Inspecting cylinder bore Special tools and workshop equipment required t  Internal precision measuring instrument 50...100 mm –  Measure at 3 points crosswise in a transverse direction -A- and lengthwise -B-. l  Deviations from specified dimension: max. 0.08 mm   Note Do not measure the cylinder bore if the cylinder block is fixed to the assembly stand -MP 1-202- with the engine mount -MP 9-101 -, as this may result in incorrect measurements.