Removing The Camshafts - Yamaha MTN850-A 2017 Service Manual

EAS30256

REMOVING THE CAMSHAFTS

1. Remove:
• Timing mark accessing bolt "1"
• Crankshaft end cover "2"
1
2. Align:
• Mark "a" on the generator rotor
(with the generator rotor cover mark "b")
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
a. Turn the crankshaft counterclockwise.
b. When piston #1 is at BTDC125 on the com-
pression stroke, align the BTDC125 mark "a"
on the generator rotor with the generator rotor
cover mark "b".
TIP
BTDC125 on the compression stroke can be
found when the camshaft lobes are turned away
from each other.
b
a
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3. Remove:
• Timing chain tensioner "1"
• Timing chain tensioner gasket
2
1
5-11
4. Remove:
• Camshaft cap "1"
• Intake camshaft cap "2"
• Exhaust camshaft cap "3"
ECA13720
NOTICE
To prevent damage to the cylinder head,
camshafts or camshaft caps, loosen the
camshaft cap bolts in stages and in a criss-
cross pattern, working from the outside in.
1
5. Remove:
• Intake camshaft "1"
• Exhaust camshaft "2"
TIP
To prevent the timing chain from falling into the
crankcase, fasten it with a wire "3".
2
1
6. Remove:
• Camshaft sprocket "1"
TIP
Use the camshaft wrench "2" and loosen the
camshaft sprocket bolt.
CAMSHAFTS
2
3
3