Connecting rod and piston group (Skoda Kodiaq NS7)

General appearance

Checking the piston ring clearance

Install the ring perpendicularly from the top down to the bottom of the bore in the cylinder at a distance of approximately 15 mm from the edge of the cylinder, as shown in the figure below. For installation, use a piston without rings.

Piston ring(dimensions in mm)	new	Wear limit
Compression rings	0,20+°15	0,7
Oil scraper ring rack (two elements)	0,50+°20	1,0
Oil scraper ring rack (three elements)	0,20+0,20	1,2

Checking the piston ring clearance by height

Before proceeding with the inspection, clean the piston ring grooves.

Piston ring(dimensions in mm)	New	Wear limit
1st compression ring (federal Mogul ring manufacturer)	0.05-0.09	0,15
1st compression ring (mahle ring manufacturer)	0.035 -0.085	0,15
2nd compression ring	0.03-0.07	0,15
Part 2 of the oil scraper rack	Not measured
3rd part of the oil scraper rack	0.04-0.08	-

Checking the piston diameter

• Measure at a distance of 15 mm from the bottom edge, perpendicular to the axis of the piston pin. Maximum deviation from the nominal size: 0.04 mm.

Nominal piston diameter: 74.42 mm

Dimensions include special coating for transportation. Coating thickness: 0.015 mm.

Checking the inner diameter of the cylinders

• Measure the cylinder crosswise at 3 places in the transverse direction (A) and in the longitudinal direction (B), as shown in the figure below. Maximum deviation from the nominal size: 0.08 mm.

Nominal cylinder bore: 74.5 + 0.015 mm.

Assembly position and piston attachment to cylinder liners

The arrow on the piston bottom (arrows) should point towards the pulley.

Position for assembling bearing shells in connecting rods

• Place the bearing shells into the middle of the connecting rod or connecting rod bearing cap.

Size (a) = 2.5 mm.