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Cylinder bore and conrod clearance
- The engine must not be attached to a stand, e.g., VAG 540 as this can lead to significant distortions
- Measure the bores 10mm from the top (1), half way down the bores (2) and 10mm up from the bottom (3). Make each measurement both longitudinally and transversely.
- Preferred tools are an internal locking micrometer and a digital caliper:
- Collapse the internal micrometer and tighten the gripping screw
- Position the lobes roughly where the measurement is to be made
- Release the gripping screw to allow the lobes to extend
- Position the control stem slightly off-centre
- Tighten the gripping screw until it just grasps the lobes
- Centre the control stem, so that the lobes measure a minimum - the actual diameter
- Tighten the gripping screw to preserve the measurement
- Measure the diameter across the lobes using a digital micrometer
- Make each of the six measurements at least three times and take the averages
- Record the measurements in the service history with the date and recorded mileage
- Measure big end float with standard feeler gauges
- Wear limit is 0.4mm
- Record the measurements in the service history with the date and recorded mileage
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