Toyota 3R-B 1969, Repair Manual

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L U B R I C A T I N G S Y S T E M - Description 6-1
D E S C R I P T I O N
F i g . 6-1 5 R -E n gin e Lubricating S ystem Y6170
T h e lubricating system utilized on the 5 R , 3 R - B and 3 R - C engines is of an all
fo rc e d -fe e d and full-flow filtering type insuring positive lubrication, and the lubri­
cating circuit is as shown in the above illustration.
T h e high p ressu re oil discharged from the oil pump enters into the oil filter,
and the oil is delivered into the oil hole within the cylinder after the oil is fully
filtered by the oil cleaner element.
T h e oil reaching the oil hole separates into three different w a y s ; engine front,
center and r e a r section s, and the oil flows separately into two w a y s again f o r
lubricating the crankshaft bearings and the camshaft b e a r in g s .
T h e oil reaching the crankshaft lubricates the crankshaft journals, and after lu­
bricating the crankshaft pins through the oil holes in the crankshaft, this oil flow
sprays onto the cylinder walls and the piston pins from the hole located at the
connecting rod bearing end. But on the connecting rod fo r the 3 R - B and 3 R - C , a
lubrication hole is provided inside the connecting rod from the bearing end to
the piston pin e n d .
A part of the oil which lubricated the camshaft N o . l bearing is d eliv ered to the
camshaft N o . 2 bearing. T h e re s t of the oil travels through the oil hole in the cy l­
inder block and the cylinder head to the va lve r o c k e r support N o . l , which lu­
bricates the valve r o c k e r shaft, and then flow s out of the r o c k e r a rm s.