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Home >> Mitsubishi >> 1991 >> Precis Base, Standard >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> 1.5L 4-CYL - VINS [A,J,X] & 1.6L 4-CYL - VIN [Y] >> Overhaul >> Cylinder Head >> Valves

Cylinder Head: Valves

Measure valve stem diameter and margin. Replace valve if measurements are not within specification. See VALVES & VALVE SPRINGS  table under ENGINE SPECIFICATIONS.

OVERSIZED VALVE SEAT SPECIFICATIONS

Size Mark Seat Size In. (mm) Cyl. Head Bore In. (mm) Seat Height In. (mm)
Precis
Intake
30 .012 (.30) 1.429-1.430 (36.30-36.32) .280 (7.10)
60 .024 (.60) 1.441-1.442 (36.60-36.63) .291 (7.40)
Exhaust
30 .012 (.30) 1.272-1.273 (32.38-32.33) .295 (7.49)
60 .024 (.60) 1.283-1.285 (32.59-32.64) .307 (7.79)
1.5L Except Precis
Intake
Primary
30 .012 (.30) 1.079-1.080 (27.42-27.44) .276-.283 (27.42-27.44)
60 .024 (.60) 1.091-1.092 (27.72-27.74) .287-.295 (7.29-7.49)
Secondary
30 .012 (.30) 1.276-1.277 (32.42-32.44) .276-.283 (7.01-7.19)
60 .024 (.60) 1.288-1.289 (32.72-32.74) .287-.295 (7.29-7.49)
Exhaust
30 .012 (.30) 1.394-1.395 (35.42-35.44) .291-.299 (7.39-7.59)
60 .024 (.60) 1.406-1.407 (35.72-35.74) .303-.311 (7.70-7.90)
1.6L
Intake
30 .012 (.30) 1.390-1.391 (35.31-35.33) .311-.319 (7.90-8.10)
60 .024 (.60) 1.402-1.403 (35.60-35.64) .323-.331 (8.20-8.40)
Exhaust
30 .012 (.30) 1.311-1.312 (32.30-33.32) .311-.319 (32.30-33.32)
60 .024 (.60) 1.323-1.324 (33.60-33.63) .323-.331 (8.20-8.40)