Contents: Checking the thermal clearance of…↓ Checking the piston ring clearance…↓ Checking the pistons ↓ Checking the cylinder diameter ↓ Piston and cylinder dimensions ↓
Checking the thermal clearance of piston rings
Drive the ring from above at a right angle to the bottom hole of the cylinder, at a distance of about 15 mm from its edge.
Checking the piston ring clearance by height
(The original article is available at: VWMANUAL)
Fig. 2.157. Checking the piston ring clearance by height
Clean the ring groove before checking.
Checking the pistons
Fig. 2.158. Measuring the piston diameter
Measure approximately 10 mm from the bottom edge, at right angles to the piston pin axis.
Maximum permissible deviations from the nominal size are max. 0.04 mm.
Checking the cylinder diameter
Take measurements crosswise in three places in transverse direction A and longitudinal direction B.
Maximum permissible deviations from the nominal size are 0.08 mm.
Note: Cylinder cavity measurements cannot be performed if the cylinder block is secured with an engine and gearbox tilter on a mounting stand, as this may result in measurement errors.
Piston and cylinder dimensions
Note: Dimensions do not include graphite coating (thickness 0.02 mm) The graphite coating wears off over time.
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