Inspection And Servicing Of Crankshaft - Yanmar 6LPA-STP2 Service Manual

Cylinder Block
12/05
16. Check the piston pin engagement at room
temperature. Apply engine oil to the piston pin
and press it into the connecting rod by hand
(Figure 5-125).
Figure 5-125
Figure 5-125
Inspection and Servicing of
Crankshaft
1. To measure the circle runout of the crankshaft,
set the crankshaft on a V-block. Measure circle
runout of the center journal using a dial
indicator while turning the crankshaft
(Figure 5-126, (1)).
• Maximum circle runout: 0.06 mm (0.002 in.)
If the circle runout exceeds the specified
maximum, replace the crankshaft.
Figure 5-126
Figure 5-126
2. Inspect and measure diameters of each crank
journal (Figure 5-127, (1)) and crank pin
(Figure 5-127, (2)) using a micrometer.
6LPA Service Manual
• Standard crank journal diameter: 66.982 to
67.000 mm (2.6370 to 2.6377 in.)
• Standard crank pin diameter: 58.982 to
59.000 mm (2.3221 to 2.3228 in.)
If the measured diameter is out of the specified
range, check the oil clearance. Grind or replace
the crankshaft as needed.
3. Measure the taper and out-of-round of the
crank journal and crank pin.
• Maximum taper and out-of-round: 0.020 mm
(0.0008 in.)
If the measured taper or out-of-round exceeds
the specified maximum, replace the crankshaft.
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Figure 5-127
(1)
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© 2007 Yanmar Marine International
ENGINE
(1)
(2)
Figure 5-127
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