Yanmar 4LHA-HTP - Page 350

Chapter 2 Basic Engine
7. Crankshaft and Main Bearing
i 4LHA Seriei
mm (in.)
Standard
Wear limit
Crank pin
Outside dia.
59.952 - 59.964
(2.3603 - 2.3608)
59.90
(2.3583)
Crank pin
Bushing inside dia.
60.00 - 60.042
(2.3622 - 2.3639)
60.10
(2.3661)
Crank pin
Crank pin and bushing oil clearance
0.036 - 0.09
(0.0014 - 0.0035)
-
Crank journal
Outside dia.
69.952 - 69.964
(2.7540 - 2.7545)
69.90
(2.7520)
Crank journal
Bushing inside dia.
70.00 - 70.045
(2.7559 - 2.7577)
70.10
(2.7598)
Crank journal
Crank journal and bushing oil clearance
0.036 - 0.093
(0.0014 - 0.0037)
-
Fillet rounding of crank pin and journal
4.0-4.3
(0.1575-0.1693)
—
(4) Checking side clearance of the crankshaft
After assembling the crankshaft, tighten the main bear-
ing cap to the specified torque, and move the crank-
shaft to one side, placing a dial gauge on one end of
the shaft to measure thrust clearance.
This measurement can also be effected by inserting
the gauge directly into the clearance between the
thrust bearing and crankshaft thrust surface.
Replace the thrust bearing if it is worn beyond the limit.
mm (in.)
Standard
Wear limit
Crankshaft side gap
0.132 - 0.223
(0.0052 - 0.0088)
0.29
(0.0114)
Dial indicator
Crankshaft
2-30