Suzuki K6A-YH6 Technical/Repair Manual page 38

THEORY OF OPERATION
From the main gallery, oil distributes to the crankshaft
journals and crank pins. The crankshaft is drilled
between the crank pins and rod pins. Oil flows through to
the rod pins, lubricating the rod journals, and then passes
into a drilled passage in the connecting rod. Oil also
seeps out the sides of the crank and rod journals to
lubricate the sides of the journals. Any excess oil from
lubricating the crank and rod journals passes out from
the journals and returns to the oil pan.
The passage in the connecting rod leads to an oil jet at
the top of the large end of the rod.This jet sprays oil
upward to lubricate the cylinder walls, piston, and piston
pin. Excess oil drains back to the oil pan.
Oil from the main gallery is also sent up to the cylinder
head. On its way up to the cylinder head, the oil passes
through a restrictor orifice. This limits the amount of oil to
the head and ensures the proper amount of oil in the
lower end of the engine.
When the oil reaches the cylinder head, the passage
splits. Oil is sent to the timing chain tension adjuster to
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maintain proper chain tension. An orifice in the tension
adjuster also provides a spray to lubricate the timing
chain.
The oil is also sent up to the front of the cylinder head,
where it lubricates both of the front camshaft journals. Oil
enters both camshafts from the front journals and flows
through the camshafts, where it exits lube holes for each
of the other camshaft journals. Excess oil exits the
journals and splash lubricates the camshaft faces and
tappets. Oil seeps through oil holes in the tappet
adjusting shims and tappets to lubricate the valves.
Excess oil then flows through return passages from the
cylinder head and returns to the oil pan.
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