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1 • Exchange engines
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2 • Oil sump
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3 • Crankshaft
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4 • Cylinder block
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5 • Cylinder head
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6 • Oil filter
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7 • Oil cooler
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8 • Engine mounting
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9 • Engine breather system
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10 • Exhaust emission control system - Series I and early Series II (air injection) USA, Canada, Australia and Japan exports: all Series I, Series II to engine no. 7P25000
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11 • Exhaust emission control system - late Series II and all Series III (air injection) USA, Canada and Japan: Series II from engine no. 7P25001, Series III to engine no. 7P45000 Germany Austria and Switzerland with HE engines: Series III from engine no. 7P45001
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12 • Exhaust emission control system - Series I and Series II (thermostatic vacuum system)
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13 • Exhaust emission control system - Series III (auxiliary air system and EGR valve)