Crankshaft And Main Bearing - Yanmar 3JH3E Service Manual

Chapter 2 Basic Engine
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_C_ra_n_k_s_h_afi_t_a_n_d_M_a_in_B_e_a_n_·n_g _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
3,4JH3(B)(C)E
5. Crankshaft and Main Bearing
The crank pin and crankjournal have been induction hard-
ened for superior durability, and the crankshaft is provided
with four balance weights for optional balance. The
crankshaft main bearing is of the hanger type. The upper
metal (cylinder block s·1de) is provided w·1th 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.
Main bearing metal {basic)~@
Thrust metal
Main bearing cap (basic)
Main beacing bolt
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5-1 Crankshaft
(1) Color check of shaft
Perform a color check after cleaning the crankshaft,
and replace the crank shaft if there is any cracking or
considerable damage.
Balance weight
Crank shaft
2-18
Main bearmg cap
(intermediate)
Main bearing bolt
Printed in Japan
HINSHI-H8009