Honda WB20XT2 Manual page 107

dummyhead dummyhead
CYLINDER HEAD
VALVE SPRING FREE LENGTH/
PERPENDICULARITY
Measure the valve spring free length.
STANDARD: 30.5 mm (1.20 in)
SERVICE LIMIT: 29.0 mm (1.14 in)
If the measured length is less than the service limit,
replace the valve spring (page 12-4).
Measure the valve spring perpendicularity.
SERVICE LIMIT: 1.5° max.
If the measured perpendicularity is more than the
service limit, replace the valve spring (page 12-4).
PUSH ROD RUNOUT
Check both ends of the push rod for wear.
Check the push rod for straightness.
If necessary, replace the push rod (page 12-3).
VALVE GUIDE REPLACEMENT
Chill the replacement valve guides in the freezer
section of a refrigerator for about an hour.
Use a hot plate or oven to heat the cylinder head evenly
to 150°C (302°F).
To avoid burns, use heavy gloves when handling
the heated cylinder head.
• Do not use a torch to heat the cylinder head;
warpage of the cylinder head may result.
• Do not get the cylinder head hotter than 150°C
(302°F); excessive heat may loosen the valve seat.
12-8
WB20XT2•WB30XT2