Yanmar BY series, Service Manual

Page: 105 / 275

ENGINE
5-50
BY Service Manual
Camshaft and Timing Gear Train
Figure 5-77
Note: Special tool shown on intake camshaft.
Exhaust camshaft is checked in the
same manner but has no adjustment. If
camshaft gears are properly aligned,
exhaust camshaft timing will be correct.
7. Install special tool OEM No. 11 6 321
(Figure 5-77, (1)) on the flats of the of the
intake camshaft and secure with special tool
OEM No. 11 6 322
(Figure 5-77, (2)) . Secure to
cylinder head with two bolts.
8. Tighten the two exposed sprocket retaining
bolts to 15 N·m (133 in.-lb).
9. Remove special tools.
10. Rotate the crankshaft 360° to expose the
remaining sprocket retaining bolt and tighten to
15 N·m (133 in.-lb).
11. Install cylinder head cover. See Remove and
Install Cylinder Head Cover on page 5-20.
Removing and Installing Vibration
Damper - 4BY
1. Disconnect battery negative (-) cable.
2. Remove alternator and seawater pump drive
belts. See Remove and Install Alternator on
page 11-7 and Replace Seawater Pump Belt on
page 7-21.
Figure 5-78
Note: A shop-made flywheel holder can be
fabricated using a piece of an old ring
gear.
Figure 5-79
3. Remove starter motor (See Remove and Install
Starter Motor on page 10-7) and install flywheel
holder to prevent crankshaft from rotating
(Figure 5-79) . Mount the tool using the starter
mounting bolts.
4. Remove the vibration damper bolt.
5. Remove special tool and remove damper.
6. Place vibration damper on crankshaft and
install new bolt and washer until it is snug.
7. Install special tool OEM No. 11 6 310 onto the
vibration damper.
000 3 77 3
(1)
(2)
000 383 1
000 383 2