Checking The Journal Oil Clearance - Yamaha F150A Service Manual

Checking the journal oil clearance

1. Clean the crankshaft journal bearings,
crankshaft journals, and bearing portions
of the crankcase and cylinder block.
2. Place the cylinder block upside down.
3. Install the crankshaft journal bearings "1"
and crankshaft "2" into the cylinder block
"3".
TIP:
Install the crankshaft journal bearings "1" in
the original positions.
2
4. Place a piece of Plastigauge (PG-1) on
each crankshaft journal, parallel to the
crankshaft.
TIP:
Do not place the Plastigauge (PG-1) over the
oil hole in each crankshaft journal.
5. Install the crankshaft journal bearings
into the main bearing cap and crankcase.
TIP:
Install the crankshaft journal bearings in the
original positions.
1
3
7-71
6. Install the main bearing cap "1", and then
tighten the main bearing cap bolts "2" to
the specified torques in 2 stages and in
the order [1], [2], and so on.
TIP:
• Do not turn the crankshaft until the journal
oil clearance measurement has been com-
pleted.
• In the second tightening stage for the main
bearing cap bolts "2", mark the main bear-
ing cap bolts and the main bearing cap with
identification marks "a", and then tighten
the bolts 90° from the marks on the main
bearing cap.
1
90
a
[5]
[1]
[4]
Main bearing cap bolts "2":
1st: 30 N·m (3.0 kgf·m, 22.1 ft·lb)
2nd: 90°
Crankcase
2
2
[6]
[2]
[3]
0
1
2
3
4
5
6
7
8
9
10
A