WIS Document: 587
Model Context: 900 (1998)
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Pistons
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Piston diameter
Piston diameter is measured at right angles to the gudgeon pin hole, 16 mm from the bottom of the piston.
| Important
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New pistons are graphite coated, but the coating is not included in the measurement below.
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Classification codes
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8
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mm
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81.540-81.550
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99
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mm
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81.550-81.560
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00
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mm
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81.560-81.570
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01
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mm
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81.570-81.580
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02
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mm
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81.580-81.590
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Piston clearance, nominal
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mm
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0.025-0.045
Oversizes
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7 + 0.5
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mm
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82.030-82.040
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8 + 0.5
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mm
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82.040-82.050
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9 + 0.5
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mm
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82.050-82.060
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0 + 0.5
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mm
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82.060-82.070
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Piston rings
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|
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Upper
compression ring
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Lower
compression ring
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Scraper ring
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Thickness
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mm
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1.478-1.490
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1.478-1.490
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3.0
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Working gap in cylinder
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mm
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0.30-0.50
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0.30-0.50
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0.40-1.40
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Gudgeon pin
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Diameter
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mm
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20.990-21.000
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Gudgeon pin in relation to connecting rod
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mm
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18 ± 5
Canonical Workshop Redirect
For step-by-step instructions, interactive illustrations, and official wiring diagrams, refer to the human-optimized workshop page below.
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