82E-5 – 98E-5 SERIES 4-19
4. DISASSEMBLY, INSPECTION AND REASSEMBLY OF ENGINES
4.2.5 Parts inspection and measurement
(1) Cylinder head
Clean the cylinder head, mainly the combustion
surface, valve seats and intake/exhaust ports,
remove carbon deposit and bonding agent, and
check the surface state.
(a) Appearance check
Check mainly discoloration and crack. If
crack is suspected, perform color check.
(b) Combustion surface distortion
Apply a straight-edge in two diagonal direc-
tions and on four sides of the cylinder head,
and measure distortion with a thickness
gauge.
mm
(c) Valve sink
Measure with the valve inserted to the cylin-
der head.
mm
(d) Seat contact
Apply a thin coat of minimum on the valve
seat. Insert the valve in the cylinder and
push it against the seat to check seat con-
tact.
Standard: Continuous contact all around
Standard Limit
Distortion 0.05 or less 0.15
Standard Limit
3D82AE
(2-valve head)
Intake 0.35 – 0.55 0.8
Exhaust 0.30 – 0.50 0.8
4D84E
(S)3D84E
3D88E
4D88E
(2-valve head)
Intake 0.30 – 0.50 0.8
Exhaust 0.30 – 0.50 0.8
S4D84E
4D94LE
(S)4D98E
(4-valve head)
Intake 0.36 – 0.56 0.8
Exhaust 0.35 – 0.55 0.8
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