Briggs & Stratton Vanguard 10V300, Repair Manual

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47
CYLINDER HEAD
Disassembly
1. Pack shop towels into the combustion chamber and
place cylinder head on bench with the combustion
chamber side down.
2. Remove exhaust valve as follows:
A. See Figure 53. Remove valve cap ( A ).
B. Using thumb pressure, press down on valve
spring retainer ( B ) to disengage from valve stem
groove. Guide valve stem into larger offset hole in
valve spring retainer and then relieve valve spring
tension as shown in Figure 52.
C. Remove valve spring retainer and valve spring
( C ).
D. Remove valve spring seat ( D ).
E. Remove valve ( E ) from valve guide.
F. Mark the bottom of the valve to identify it as the
exhaust valve. Bag the valve, valve cap, valve
spring retainer, valve spring, and valve spring
seat, so that all parts can be installed in their
original locations at time of assembly.
3. Remove intake valve as follows:
A. Remove valve cap ( F ).
52
53
B. Using thumb pressure, press down on valve
spring retainer ( G ) to disengage from valve stem
groove. Guide valve stem into larger offset hole in
valve spring retainer and then relieve valve spring
tension as shown in Figure 52.
C. Remove valve spring retainer and valve spring
( H ).
D. Inspect valve spring retainer groove for burrs that
could damage the valve stem seal during valve
removal. Remove any slight burrs with a fine-
tooth file. Lightly lubricate valve spring retainer
groove with clean engine oil, and then remove
valve ( I ) from valve guide.
NOTE: Carefully inspect valve stem seal ( J ) for
nicks, cuts or other damage. Valve stem seal
damage requires cylinder head replacement.
E. Mark the bottom of the valve to identify it as the
intake valve. Bag the valve, valve cap, valve
spring retainer, and valve spring, so that all parts
can be installed in their original locations at time
of assembly.
Cleaning
1. Remove all carbon deposits from combustion
chamber and machined surfaces of cylinder head.
Exercise caution to avoid removing any metal
material. For best results, use an air tool with
Not for
Reproduction