Yanmar BY series, Service Manual

Page: 66 / 275

ENGINE
BY Service Manual 5-11
Special Torque Chart
SPECIAL TORQUE CHART
System Component Model Thread Comments Specification
Engine Block
Main Bearing
Replace, wash and oil
4BY
6BY M10x80
Steel Bolts
Initial Torque
Torque Angle
23 N·m (204 in.-lb)
Plus 90°
Coolant Drain Plug to
Crankcase
4BY
6BY
M14x1.5 Replace Sealing Ring 25 N·m (221 in.-lb)
Clamping and Guide Rails to
Crankcase
4BY
6BY
M14 Torque 20 N·m (177 in.-lb)
Engine Mount Nut
4BY
6BY
M20 Torque 300 N·m (221 ft-lb)
Torsion Damper
Torsional Vibration Damper
to Crankshaft
4BY M18x1.5
Initial Torque
1st Torque Angle
2nd Torque Angle
3rd Torque Angle
100 N·m (74 ft-lb)
60°
60°
30°
6BY M10x86
Initial Torque
1st Torque Angle
2nd Torque Angle
40 N·m (30 ft-lb)
60°
60°
Connecting Rod and
Bearing
Connecting Rod Bolts
Replace, wash and oil
4BY
6BY M10x80
12.9
Assembly Torque
Initial Torque
Torque angle
5 N·m (44 in.-lb)
20 N·m (177 in.-lb)
70°
Cylinder Head with
Cover
Cylinder Head Bolts
Replace, wash and oil
4BY
6BY
M12x1.5
Initial Torque then
Loosen all bolts 180°
2nd Torque
1st Torque Angle
2nd Torque Angle
80 N·m (59 ft-lb)
50 N·m (37 ft-lb)
90°
90°
Seal Plug
Replace screws
4BY
6BY
M14x1.5 - 30 N·m (22 ft-lb)
Camshaft
Sprocket to Camshaft
4BY
6BY
M7x19 - 15 N·m (133 in.-lb)
Camshaft Bearing Cap Bolt
4BY
6BY
- - 10 N·m (89 in.-lb)
Oil Sump
Oil Drain Plug 6BY M12x1.5 Replace Seal 25 N·m (221 in.-lb)
Oil Sump to Crankcase 6BY M8x26 - 20 N·m (177 in.-lb)
Oil Deflector to Crankcase
Lower Section
6BY M6x16 Thread-Tapping Screw 10 N·m (89 in.-lb)
Timing Case Covers
Timing Case Cover Bolt
4BY
6BY
-
Initial Torque of 5 N·m
(44 in.-lb)
14 N·m (124 in.-lb)
Guide Rail Pin
4BY
6BY
-
Apply Medium
Strength Thread Lock
and Sealer to the
Threads
20 N·m (177 in.-lb)
Plug to Timing Case Cover
4BY
6BY
M30x1 Replace Seal 70 N·m (52 ft-lb)
Plug to Timing Case Cover
4BY
6BY
M40x1.5 Replace Seal 30 N·m (22 ft-lb)