Valve Measurement And Reconditioning; Valve Seat Width Measurement Procedure; Valve Seat Roundness Measurement Procedure - Suzuki XL7 2007 Service Manual

Valve Measurement and Reconditioning

Overview
NOTE
• Proper valve service is critical to engine
performance. Therefore, all detailed
measurement procedures must be
followed to identify components that are
out of specification.
• If the measurement procedures reveal that
the valve or valve seat must be
reconditioned, it is critical to perform the
measurement procedures after
reconditioning.

Valve Seat Width Measurement Procedure

1. Measure the valve seat width in the cylinder head
using a proper scale.
2. Measure the seat width on the valve face (1) using a
proper scale.
NOTE
The seat contact area must be at least 0.5 mm
(0.020 in) from the outer diameter (margin) of
the valve. If the contact area is too close to
the margins, the seat must be reconditioned
to move the contact area away from the
margin.
3. Compare your measurements with the specifications
listed in "Engine Mechanical Specifications".
4. If the seat widths are acceptable, check the valve
seat roundness using the Valve Seat Roundness
Measurement Procedure.
5. If the seat width is not acceptable, you must grind
the valve seat using the Valve and Seat
Reconditioning Procedure to bring the width back
into specification. Proper valve seat width is critical
to providing the correct amount of valve heat
dissipation.

Valve Seat Roundness Measurement Procedure

1. Measure the valve seat roundness using a dial
indicator attached to a tapered pilot installed in the
guide. The pilot should have a slight bind when
installed in the guide.
CAUTION
!
The correct size pilot must be used. Do not
use adjustable diameter pilots. Adjustable
pilots may damage the valve guides.
2. Compare your measurements with the specifications
listed in "Engine Mechanical Specifications".
3. If the valve seat exceeds the roundness
specification, you must grind the valve and valve
seat using the Valve and Seat Reconditioning
Procedure.
4. If new valves are being used, the valve seat
roundness must be within 0.05 mm (0.002 in).
Engine Mechanical: 1D-183