CYLINDER HEAD, CYLINDER, PISTON
CYLINDER HEAD, CYLINDER, PISTON
3-5-32
A
B
A
Good contact
surface
Seat ring repair (valve grinding)
◆
Insert the guide into the valve guide.
◆
Apply cutting oil to the seat ring and tool.
◆
Place the 46° tool on the guide and perform light
cutting.
◆
Check the cutting area of the seat ring:
If the contact area is less than 75% of the full circle of the
seat ring, turn it 180° and do another light cut.
If the tool touches the uncut part of the seat ring, check
the guide. Check for burrs, scratches, or excessive
jumps. If the guide is bent, it must be replaced.
If the contact surfaces of the tools are all in the same
position, it means that the valve guide has been deformed
due to improper installation.
If the initial cutting contact area is greater than 75%,
continue cutting the seat ring until all dents are removed
and a clear seat ring surface appears.
◆
To check the contact area on the valve, apply a thin
layer of Prussian Blue™ paint on the valve seat
ring. If the interference angle is 46°, paint a black
permanent mark
【
A
】
on the entire valve disc
surface.
◆
Insert the valve into the catheter and tap the valve
into place several times.
◆
Remove the valve, and use the paint on the valve
to confirm where the valve is in contact with the
seat ring. The seat ring should touch the middle or
slightly higher position of the valve disc surface, and
the width should be appropriate
If the contact position is at the top edge of the valve disc
surface to the unpainted area
【
B
】
, it indicates that the
contact position between the valve disc surface and the
seat ring is too high. At this time, use a 30° tool to lower
the seat ring.
If it is too low, use a 60° tool to raise the seat ring. When
the contact area is concentrated on the valve surface,
measure the width of the valve seat.
If the seat ring contact surface is too wide or uneven, cut
the top and bottom to narrow the seat ring.
If the seat ring contact surface is too narrow, use a 45°
tool to widen it, and recheck the valve surface and the
contact surface width on the seat ring after each cut.
TIPS
If it is an interference angle, under normal
circumstances, the contact surface on the valve disc
surface will be very narrow. A uniform and continuous
contact surface
【
A
】
can be seen on the valve disc
surface.
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