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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 and oil cooler
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7 • Engine mountings
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8 • Engine breathing system - TR5/250, TR6 Carbrettor to December 1969, all TR6 P.I. TR6 carburettor models to CC32142
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9 • Engine breathing system - TR6 Carburettor from January 1970 TR6 Carburettor models from CC50001
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10 • Air injection and air pump - TR6 Carburettor from May 1975 TR6 carburettor models from CF35001