Generac Power Systems TXP User Manual
Page 66
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REFACE VALVES AND SEATS
t
Valves and valve seats may be lap
ped or ground, using a fine lapping
compound. Clean away all lapping
compound after lapping. Exhaust
valve faces have an angle of 45°,
while Intake valves have an angle
of 30°. Valve seat WIDTH should
be between 3/64 to 1/16 inch - if
seat is wider, use a narrowing
stone or a cutter to decrease the
seat width. Replace valve if its
margin is 1/64 inch (or less) aft
er refacing. Badly burned valves
or valve seats should be replaced,
CHECK/ADJUST TAPPET CLEARANCE
Install
valves
in
their
correct
po
sition in cylinder, DO NOT INSTALL
INTAKE VALVE STEM SEAL. Turn crank
shaft until exhaust valve is at its
highest
position.
Then
check
Intake
Valve stem to tappet clearance with
a feeler gauge. Grind off end of In
take Valve stem to obtain proper
clearance as shown in CHART below.
Turn crankshaft to bring Intake Valve
to its highest position, then check
exhaust valve stem to tappet clear
ance in the same manner. Grind end of
valve stem to obtain proper clearance.
VALVE TAPPET CLEARANCE
WITH SPRINGS
INSTALLED
INTAKE..
EXHAUST
.007”- .009”
.009”- .011”
SPRINGS NOT
INSTALLED
INTAKE
EXHAUST
.005”- .007”
.007”- .009”
INSTALL VALVES
Exhaust and Intake Valve compon
ents are shown at right. A new
stem seal should be installed on
the Intake Valve, if required.
Heavier springs are used on the
Exhaust Valves. Apply a light
film of oil on valve stems before
installing valves in valve guides
Issued 3-78