Subaru EA190V, Service Manual

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41
Tool
：
Valve seat cutter
d) Use the 32°-45°cutters to narrow and adjust the valve seat
so that it contacts the middle of the valve face.
・
The 32°cutter removes material from the top edge
(contact too high).
・
The 45°cutter removes material from the bottom edge
(contact too low). Be sure that the width of the finished
valve seat is within specification.
Standard Service limit
0.8mm 2.0mm
e) Use 45°cutter to remove any possible burrs at the edges of the seat.
f) After resurfacing seat, inspect for even valve seating width.
Apply colorant to the valve tapered face, insert the valve and press
it forcefully several times, be sure the valve does not rotate on the
seat.
The seating surface, as shown by the transferred marking
compound, should have good contact all the way around.
g) Apply the abradant to the valve seat face, suitable for running
in when rotating valve seat with valve seat cutter.
h) After reassembling, check the valve clearance
Cutter holder
IN valve
：
32°
EN valve
：
32°
IN valve
：
45°
EX valve
：
45°
0.8mm
Valve lapping tool