Oil Circuit (660 Smc From Model 2004 On) - KTM 400-660 LC4 1998-2005 Repair Manual

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Oil circuit (660 SMC from model 2004 on)

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The oil pump pumps the engine oil past the by-pass valve through the oil filter . After the oil filter an oil line branches off
to the jets 4 which spray engine oil on the piston pin bearing and the piston pins. The second oil line takes the main flow of oil
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into the front pipe of the frame , where the engine oil is cooled down. Afterwards the engine oil runs through the fine screen
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filter , which filters out even the finest impurities. The cleaned engine oil is pumped through the oil line and the clutch cover
into the crankshaft to the conrod bearing 7 and drips into the crankcase. An additional oil pump 8 sucks the engine oil out of
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the crankcase and pumps it through the oil line to the gear wheels of the 4th and 5th gear. Via the gear wheels, the engine oil
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reaches the oil sump. The timing chain runs through the oil sump and transports the engine oil upwards to the cylinder head.
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Through the bore hole the oil reaches the camshaft and the valves.
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