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Discussion Starter · #1 ·
Was wondering how the oiling system works in most of the chinese engines, Lifan, etc. I saw that there is an oil pump, does that pump oil to the crank and big end bearings, or to where? Something about an oil slinger? Thanks.

DaveA.
 

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The Oil travels from the pump towards the front of the RHS centre crankcase where some is directed via a gallery drilled thru the clutch cover then transfers thru the slinger (centrifugal oil filter) to the crank big end bearing ... and some travels the other way up to the top end via a gallery around the bottom right side cylinder stud ... There is usually a restrictor jet/nozzle where the oil exits the crank case into the lower RHS stud gallery ... It's placed there to ensure that the slinger and crank gets higher pressure oil supply ... Lifan and YX150/160 engines have the turn left to the cylinder gallery blocked off so that oil can only go to the crank and thru an outlet port "A" to the the supply line of an oil cooler ... the return line from the cooler is routed back into the RHS crank case thru a second port "B" which is on the other side of the blocked off point in the gallery ... The return line is placed where it is before the restrictor jet so that higher pressure oil goes thru the cooler ... Heat transfers via pressure so as a result , the pressurized cooler passes off heat more efficiently and effectively than a non pressure regulated cam end plate take off cooler ... (ie You'd need to have a restriction nozzle in the return port of the cam end plate oil cooler adaptor) ...



 

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Discussion Starter · #3 ·
Thanks Pat, nice to see that the big end does actually get oil pumped to it and not just a splash or lucky dip system.

DaveA.
 
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