Piston, rings and pin (33, 44, 49, 66 and 74 engines)
• 2nd ring
2.470 - 2.490 mm
• 3rd ring
2.970 - 2.990 mm
Piston ring gap (with piston fitted in cylinder):
• 1st ring
0.30 - 0.45 mm
• 2nd ring
0.80 - 1.00 mm
• 3rd ring
0.35 - 0.60
• Reject limit 1st and 3rd ring
1.0 mm
• Reject limit 2nd ring
1.5 mm
Max. permissible weight difference between
pistons in same engine
25 g
Piston must be heated up to 100°C before fitting gudgeon pin.
Piston, rings and pin (84 and 98 engines)
Piston diameter:
• 15 mm from lower edge
110.863 - 110.877 mm
Pin bore in piston 44.003 - 44.009 mm
Piston pin diameter 43.994 - 44.000 mm
Width of ring grooves:
• 1st groove
wedge shaped ring
• 2nd groove
2.570 - 2.590 mm
• 3rd groove
3.040 - 3.060 mm
Side clearance of piston rings in their grooves:
• 1st ring
wedge shaped ring
• 2nd ring
0.03 - 0.062 mm
• 3rd ring
0.05 - 0.082 mm
• Reject limit
0.15 mm
Piston ring height (in direction of cylinder):
• 1st ring
wedge shaped ring
• 2nd ring
2.470 - 2.490 mm
• 3rd ring
2.970 - 2.990 mm
2. Specifications
4th Generation Engines 2-15
8370 79492
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