Crankshaft And Main Bearing - Yanmar 4JH2E Service Manual

Chapter 2 Basic Engine
6. Cran'kshaft and Main Bearing
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~4JH
Series
6. Crankshaft and Main Bearing
The crank pin and crank journal have been induction harden-
ed for superior durability, and the crankshaft is provided
with four balance weights for optional balance. The crank-
shaft main bearing is of the hanger type. The upper metal
(cylinder block side) is provided with an oil groove. There
is no oil groove on the lower metal (bearing cap side). The
bearing cap (location cap) of the flywheel side has a thrust
metal which supports the thrust load.
Thrust metal
IMPORTANT:
Although the size is identical, the crankshaft material of
models 4JHE and 4JH-TE differ from that used in models
4JH-HTE and 4JH·D TE.
Please note that the crankshaft for models 4JH E and 4JH· TE
cannot be used for models 4JH-HTE and 4JH-D TE since
the crankshaft is not durable enough.
Balance weight
Crank shall
Crank shah gear
Main bearing cap (basic)
6· 1 Crankshaft
(1) Color check of shaft
@
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@fin
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C.nte,medoate)
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Perform a color check after cleaning the crankshaft,
and replace the crank shaft if there is any cracking or
considerable damage.
2·20
Main beanng
cap
'----·-
Printed in Japan
AOA1029-9002