Briggs & Stratton Vanguard 10V300, Repair Manual

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7
73
TOP END ASSEMBLY
1. Verify that mating surfaces of cylinder and cylinder
head are clean and dry. Any dust or dirt left on mating
surfaces can cause leaks.
2. Verify that two locating pins are present on downside
of cylinder deck. Install new locating pins if damaged
or missing.
3. Install new cylinder head gasket onto locating pins.
4. Install cylinder head onto locating pins.
5. Start four cylinder head screws and hand tighten until
snug.
NOTE: Verify cleanliness of cylinder head screws.
Friction caused by dirt will result in a false torque
reading.
6. Tighten cylinder head screws as follows:
A. Tighten screws to 44-81 lb-in (5-9 N-m) using
the sequence shown in Figure 103.
B. Tighten screws to 88-162 lb-in (10-18 N-m)
using the sequence shown.
C. Final tighten screws to 132-244 lb-in (14.9-27.6
N-m) using the sequence shown.
NOTE: Failure to step-torque screws in the proper
sequence may result in gasket leaks or cause the
cylinder head to warp.
103
104
7. See Figure 104. Install push rod guide plate and
rocker arm studs in cylinder head. Verify that tangs
on push rod guide plate are facing down. Tighten
rocker arm studs to 110-140 lb-in (12.4-15.8 N-m).
8. See Figure 105. Insert push rods through guide plate
to engage valve tappets. Rotate push rods to be sure
that ball ends are seated in valve tappet sockets.
105
9. Install rocker arms and rocker balls onto rocker arm
studs. Start set screws into rocker balls.
10. Tighten rocker ball nuts to obtain zero clearance
between rocker arms and valve stem tips.
11. Slowly rotate crankshaft to verify proper movement of
push rods and rocker arms.
Not for
Reproduction