Yanmar YM276 Service Manual page 134

Oankshaft, Main Bearings, and Flywheel
20-15.1 1
INSPECTION
Intermediate Main Bearings
1. Inspect intermediate, front and rear main bearings for excessive
wear, scoring or damage.
2. Measure the inside diameter of intermediate bearings in both
the
A-A
and
B-B
directions, at the front and rear of bearing.
Compare reading taken with the following specifications.
INTERMEDIATE BEARING SPECIFICATIONS
New Part Wear Limit
1.0..
. . . . . . . . . . .
W.00 to 60.045 mm 6O.lOmm
(2.362
to
2.364
in.)
12.366
in.)
Intermediate Oil
Clearance
. . . . . . .
0.036
to
0.095 mm 0.15 mm
10.0014 to 0.0037 in.)
IO.W6 in.)
3. Measure the width of rear intermediate bearing. Compare
the measurement taken with the following specifications.
REAR INTERMEDIATE BEARING
SPECIFICATIONS
New
Part Wsar Limit
Width
. . . . . . . . . .
29.83to29.91 mm 29.80 mm
11.1744 to 1.1776 in.1
11.1722 in.)
4. Measure the inside diameter of front main bearing i n both the
A-A and B-B directions. Compare the measurement taken
with the following specifications.
FRONT M A I N BEARING SPECIFICATIONS
New P a n Wear Limit
1.0..
. . . . . . . . . . .
60.OM)to 60.MSmm 60.10 mm
12.362 to 2.364 in.)
12.366 in.)
Intermediate Oil
Clearance
. . . . . . .
0.036 to 0.095 mm 0.1 5 mm
10.0014 to 0.0037 in.)
10.006 in.)
REAR M A I N BEARlNt3 SPECIFICATION
Rear Main
. . . . . . . .
65.000
to
65.045 mm 65.10mm
Bearing I.D.
12.559
to
2.560
in.)
12.563 in.)
Rear Oil
. . . . . . . . .
0.036 to 0.095 mm 0.15 rnm
Clearance 10.0014 to 0.0037 in.) 10.006 in.)
5. I f the measurement exceeds the wear limit, Replace the bearing
by using a main bearing installation and removal tool.
See page
20-1513
t o install new bearing.
SME27601116304 YM276snd 276D
Kinornoto, Printed in Jepan