1.4.1. pistons and connecting rods

We advise you to re-check the adjustment after all valves have been adjusted in the manner described above.

If the engine is in the vehicle, refit the parts removed. This includes the parts of the cylinder head cover.

1.4.1. PISTONS AND CONNECTING RODS

1.4.1.0. Technical Data

Piston pin fit: Floating fit in piston and connecting rod, secured by two snap rings

Piston assembly direction: Arrow in piston towards timing side

Piston Rings:

• Number: 3
• Type: 1 straight compression ring, 1 taper compression ring, 1 oil control ring

Ring Thickness (in mm):

• Upper ring: 1.50 mm
• Centre ring: 2.00 mm
• Oil scraper ring: 3.96 mm

Piston Diameters — 169 B Engine:

• Standard: 84.000 mm
• Class A: 83.930 - 83.941 mm
• Class B: 83.942 - 83.952 mm
• Class C: 83.953 - 83.963 mm
• Class D: 83.964 - 83.974 mm
• Oversize pistons: As per parts catalogue/microfiche

Piston Diameters — 170 Engines:

• Standard: 88.000 mm
• Class A: 87.925 - 87.936 mm
• Class B: 87.937 - 87.947 mm
• Class C: 87.948 - 87.958 mm
• Class D: 87.959 - 87.969 mm
• Oversize pistons: As per parts catalogue/microfiche

Cylinder liner diameter: See under “Cylinder Block and Liners”

Piston running clearance: 0.06 - 0.08 mm

Raised Piston Crown (2.0 litre only):

• 170 B engine: 0.51 mm
• 170 C engine: 2.98 mm

Connecting Rods

Material of connecting rods: Forged steel

Material of big end bearing shells: Steel with bearing metal

Length between centres: 132 mm ± 0.07 mm

Big end bearing diameter (without shells): 53.655 ± 0.019 mm

Big end bearing journals and bearing shells: See under “Crankshaft”

Small End Bush Bore — Standard: 24.408 ± 0.068 mm

• — Repair size: 24.708 ± 0.068 mm

Piston Ring Gaps:

Upper piston rings: 0.20 - 0.50 mm