Yanmar 4LHA-HTP User Manual

Chapter 2 Basic Engine
7. Crankshaft and Main Bearing
• 4LHA Series
(2) Bending of the crankshaft
Support the crankshaft with V-blocks at both ends
of the journals. Measure the deflection of the center
journal with a dial gauge while rotating the crankshaft
to check the extent of crankshaft bending.
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Dial gauge
y
i—
n_j>
Sff
—1
T
\
J—
_l
/
V block
V block
Bend
Deflection
Crankshaft bend
Less than 0.02mm (0.0007 in.)
(
(3) Measuring the crank pin and journal
Measure the extent of journal wear (roundness, taper).
Regrind it to the proper shape if it is within the outer
diameter limit, and replace if not.
Crank journal
Crank pin
2-2S

Yanmar 4LHA-HTP Specifications

General

Brand	Yanmar
Model	4LHA-HTP
Category	Engine
Language	English