Valve And Seat Reconditioning Procedure; Valve Stem Height Measurement Procedure - Suzuki XL7 2007 Service Manual

Valve and Seat Reconditioning Procedure

NOTE
• If the valve seat width, roundness or
concentricity is beyond specifications, you
must grind the seats in order to ensure
proper heat dissipation and prevent the
build up of carbon on the seats.
• It is necessary to reface the valve if seat
reconditioning is required unless a new
valve is used.
1. Grind the valve seats (2) to the proper angle
specification listed in "Engine Mechanical
Specifications".
2. Using the proper angle specification listed in "Engine
Mechanical Specifications", grind, relieve, the valve
seats (1) to correctly position the valve seating
surface (2) to the valve.
3. Using the proper angle specification listed in "Engine
Mechanical Specifications", grind, undercut, the
valve seats (3) to narrow the valve seat widths to the
specifications listed in "Engine Mechanical
Specifications".
4. If the original valve is being used, grind the valve to
the specifications listed in "Engine Mechanical
Specifications". Measure the valve margin again
after grinding using the Valve Margin Measurement
Procedure. Replace the valve if the margin is out of
specification. New valves do not require grinding.
5. When grinding the valves and seats, grind off as little
material as possible. Cutting valve seat results in
lowering the valve spring pressure.
6. Install the valve in the cylinder head.
– If you are using refaced valves, lap the valves into
the seats with a fine grinding compound. The
refacing and reseating operations should leave
the refinished surfaces smooth and true so that
minimal lapping is required. Excessive lapping will
groove the valve face and prevent a good seat
when hot.
NOTE
Be sure to clean any remaining lapping
compound from the valve and seat with
solvent and compressed air prior to final
assembly.
– If you are using new valves, do not lap the valves
under any condition.
7. After obtaining the proper valve seat width in the
cylinder head, you must re-measure the valve stem
height using the Valve Stem Height Measurement
Procedure.
8. If the valve stem height is acceptable, test the seats
for concentricity using the Valve-to-Seat
Concentricity Measurement Procedure.

Valve Stem Height Measurement Procedure

NOTE
To determine the valve stem height
measurement, measure from the valve spring
seat to the valve spring retainer.
1. Install the valve into the valve guide.
2. Ensure the valve is seated to the cylinder head valve
seat.
3. Install the valve stem oil seal.
4. Install the valve spring retainer and valve stem locks.
5. Measure the distance (1) between the cylinder head
to the bottom of the valve spring retainer. Refer to
"Engine Mechanical Specifications".
Engine Mechanical: 1D-185