Mercury 40 Service Manual page 212

CYLINDER HEAD
5. Remove the trigger base.
a
a -
6. Turn the driven gear and align the "1" mark with the cylinder head mark "n ".
7. Loosen belt tensioner fastening bolt to release the tension.
8. Remove the timing belt.
a
a -
b -
Page 4A-16
Trigger Base
1
1
b
4
Belt Tensioner Fastening Bolt
Timing Belt
30027
30033
30033
90-828631R3 MARCH 1999