POWR
5-45
CRANKSHAFT AND PISTON
E
CHECKING THE MAIN-BEARING OIL
CLEARANCE
NOTE:
Make sure that the crankshaft is qualified
before initiating the following procedure.
1. Measure:
•
Main-bearing oil clearance
Out of specification
→
Replace the
upper and lower bearings as a set.
NOTE:
Measure the main-bearing oil clearance at
room temperature (20 °C (68 °F)).
Measuring steps
CAUTION:
Install the bearings in their original posi-
tions. Incorrect oil clearance measure-
ments can lead to engine damage.
(1) Clean the bearings, main journals, and
bearing portions of the crankcase and
cylinder block.
(2) Place the cylinder block upside down
on a bench.
(3) Install half of the bearings
and the
crankshaft
into the cylinder block
.
NOTE:
Align the projection
of the bearing with
the notch in the cylinder body.
(4) Put a piece of Plastigauge
®
on each
main journal in parallel to the crank-
shaft.
NOTE:
Do not put the Plastigauge
®
over the oil
hole in the main journal of the crankshaft.
Main-bearing oil clearance
0.012 - 0.044 mm
(0.0005 - 0.0017 in)
3
2
1
a
1
2
3
a
Содержание F40BMHD
Страница 60: ...SPEC 2 12 MAINTENANCE SPECIFICATIONS E DIMENSIONS H9 L3 L7 L6 L2 L1 H2 H1 H7 H4 H3 H8 H6 W5 W6 W1 L4 A1 A3 A2 ...
Страница 126: ...GENERAL 3 25 E CHK ADJ LUBRICATION POINTS Apply Water resistant grease ...
Страница 128: ...CHK ADJ 3 26 GENERAL E ...
Страница 129: ...3 26 CHK ADJ F D ES ...
Страница 272: ...E LOWR BACKLASH 6 34 MEASURING THE FORWARD GEAR BACKLASH 6 34 MEASURING THE REVERSE GEAR BACKLASH 6 36 ...
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Страница 537: ...Printed on recycled paper Printed in Japan Sep 1999 1 7 1 F40B YAMAHA MOTOR CO LTD ...