When using the reamer, cutting oil must be used. Only turn right, do not push in or out directly.
The relative position between the valve seat and the working surface of the valve is very important for attaining
a proper valve seal. The purpose of the inspection is to make the valve seat joint well with the valve head.
VALVE SEAT WIDTH MEASUREMENT
• Clean up the carbon accumulation in the combustion chamber.
• Measure the width of the valve seat with a vernier caliper.
Standard 1.0 mm 0.0395 in.
Service limit 1.8 mm 0.071 in.
When abrasion causes the valve seat width to be uneven, too wide or too narrow, it will result in bad contact
between the valve and the valve seat and the seal will not be tight. When this happens the valve seat must be
reconditioned with a customized valve seat milling cutter.
The valve seat milling cutter is a customized trimming tool for the valve seat. It has three cutting angles: 32°,
• Ream out the defects on the working surface with a 45° coarse tooth milling cutter but be careful to not ream
• Ream the upper angles of the valve seat working surface with a 30° milling cutter.
• Ream the lower angles of the valve seat working surface with a 60° milling cutter.
• Finally, ream the valve seat to the specifi c seat width with a 45° milling cutter.
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