1991-Montero-Service-Manual · 3.0l v6 · страница 28 из 40 · Открыть оригинал PDF ↗
Oversize In. (mm) Size Mark Bore Size In. (mm)
.002 (.05) ............ 5 ... .4744-.4751 (12.050-12.068)
.010 (.25) ............ 25 .. .4823-.4830 (12.251-12.269)
.020 (.51) ............ 50 .. .4921-.4928 (12.500-12.518)
VALVE SEAT (SOHC)
1) Valve seat sinkage should be checked after valve and valve
seat have been reconditioned and lightly lapped. With valve assembly
installed, measure installed height of valve spring between spring
seat and retainer. Valve seat must be replaced if measurement exceeds
1.63" (41.4 mm).
2) Grind seat wall thickness until seat can be removed.
Machine cylinder head to accommodate an oversize valve seat. See
OVERSIZE VALVE SEAT SPECIFICATIONS (SOHC) table. Heat cylinder head to
approximately 480�F (250�C), and install valve seat. Grind valve seat
using 45-degree stone. Use 30-degree and 60-degree stones to set seat
height.
OVERSIZE VALVE SEAT SPECIFICATIONS TABLE (SOHC)
Application In. (mm)
Intake
Bore Depth
.012" (.3 mm) Oversize ............ .311-.319 (7.9-8.1)
.024" (.6 mm) Oversize ............ .323-.331 (8.2-8.4)
Bore Diameter
.012" (.3 mm) Oversize .. 1.7440-1.7451 (44.300-44.325)
.024" (.6 mm) Oversize .. 1.7559-1.7569 (44.600-44.625)
Exhaust
Bore Depth
.012" (.3 mm) Oversize ............ .311-.319 (7.9-8.1)
.024" (.6 mm) Oversize ............ .323-.331 (8.2-8.4)
Bore Diameter
.012" (.3 mm) Oversize .. 1.5079-1.5089 (38.300-38.325)
.024" (.6 mm) Oversize .. 1.5197-1.5207 (38.600-38.625)
VALVE SEAT (DOHC)
Grind seat wall thickness until seat can be removed. Machine
cylinder head to accommodate an oversize valve seat. See OVERSIZE
VALVE SEAT SPECIFICATIONS (DOHC) table. Chill cylinder head with
liquid nitrogen, and install valve seat. Grind valve seat using 45-
degree stone. Use 30-degree and 60-degree stones to adjust seat
height.
OVERSIZE VALVE SEAT SPECIFICATIONS TABLE (DOHC)
Application In. (mm)
Intake
Bore Depth
.012" (.3 mm) Oversize ............ .295-.303 (7.5-7.7)
.024" (.6 mm) Oversize ............ .307-.315 (7.8-8.0)
Bore Diameter
.012" (.3 mm) Oversize .. 1.4291-1.4301 (36.300-36.325)
.024" (.6 mm) Oversize .. 1.4409-1.4419 (36.600-36.625)
Exhaust
Bore Depth
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