Yamaha F90D - Checking the Crankshaft Journal Oil Clearance

6D81G11
5-46
1
2
3
4
5
6
7
8
9
CAUTION:
The (*) mark indicates that the colors of
the upper and lower bearings are differ-
ent.
Example:
If the “Connecting rod big end inside diame-
ter
a
” is 47.050 mm and the “Crankpin mark”
is 92, then the “Calculated value” = 47.050 –
43.992 = 3.058 mm
Suitable colors:
Upper bearing
→
blue
Lower bearing
→
red
6. If the calculated value is more than the
maximum value (3.063 mm), replace the
connecting rod or crankshaft or both.
Checking the crankshaft journal oil
clearance
1. Clean the bearings, the crankshaft jour-
nals, the bearing portions of the crank-
case, and the cylinder block.
2. Place the cylinder block upside down on
a bench.
3. Install half of the bearings
1
and the
crankshaft into the cylinder block
2
.
NOTE:
• Install the bearings in their original posi-
tions.
• Install the unified thrust bearing at the posi-
tion
a
shown.
4. Put a piece of Plastigauge (PG-1) on
each crankshaft journal parallel to the
crankshaft.
NOTE:
Do not put the Plastigauge (PG-1) over the
oil hole in the main journals of the crankshaft.
5. Install the remaining half of the bearings
into the crankcase.
6. Install the crankcase onto the cylinder
block and apply engine oil onto the
threads of the crankcase bolts.
Connecting rod bearing selection table
(20 °C [68 °F])
Connecting rod big
end inside
diameters –
crankpin diameters
(mm)
Upper
bearing
Lower
bearing
3.025–3.027 Yellow Yellow
3.028–3.034 Yellow Green*
3.035–3.041 Green Green
3.042–3.049 Green Blue*
3.050–3.057 Blue Blue
3.058–3.063 Blue Red*
S60C5910
1
2
a
Cylinder block