Crankshaft And Main Bearing - Yanmar 4LHA-HTP Operation Manual

Chapter 2 Basic Engine

7. Crankshaft and Main Bearing

7. Crankshaft and Main Bearing
The crank pin and crank journal have been high-frequency
hardened for superior durability, and the crankshaft is
provided with four balance weights for optimal balance.
The crankshaft main bearing is of the hanger type, with
Main bearing metal (basic)
Thrust metal
Main bearing cap (basic)
7-1 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.
/ •
Main bearing bolt
the upper metal (cylinder block side) provided with an oil
groove, and with 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.
, Balance weight
Crank shaft
2-28
14LHA Series
Main bearing metal
(intermediate)
Main bearing cap
(intermediate)
Main bearing bolt