Yanmar 6LY3 series Service Manual page 113

Inspecting the Cylinder Block and Components
12/05
Inspecting the Main Bearings
1. Check each bearing insert for flaking material,
seizure or burning of the bearing surface.
2. Replace the bearings if any discrepancies are
found.
3. Investigate the cause of any problems
discovered with the main or connecting rod
bearings.
4. Install the main bearing inserts.
Figure 5-63
(2)
(3)
(1)
(7)
(6)
Figure 5-63
1 – Thrust Bearing (Flywheel End)
2 – Main Bearing (Basic)
3 – Thrust Bearing (Inboard)
4 – Main Bearing (Intermediate)
5 – Main Bearing Cap (Intermediate)
6 – Main Bearing Cap Bolt
7 – Main Bearing Cap
5. Tighten the cap to the specified torque.
6LY3 Service Manual
(4)
(5) 0005648
© 2007 Yanmar Marine International
6. Measure the inner diameter of the main bearing
inserts.
Main Bearing Bolt Torque
New Bolt
Used Bolt
Bearing Inside Diameter
Standard
75.000-75.045 mm
(2.9527-2.9545 in.)
Bearing Thickness
Standard
2.487-2.500 mm
(0.0979-0.0984 in.)
NOTICE: When assembling the bearing cap, keep
the following in mind:
1. The lower bearing insert (cap side) has no oil
groove.
2. The upper bearing insert (block side) has an oil
groove.
3. Check the cylinder block alignment number.
4. The "FW" on the cap must face the flywheel end
of the engine.
ENGINE
245-265 N·m
(25.0-27.0 kgf·m)
(180-195 lb-ft)
225-245 N·m
(23.0-25.0 kgf·m)
(166-180 lb-ft)
Limit
—
Limit
—
5-47