Ingersoll-Rand 3IRH2N, Руководство по ремонту

Страница: 83 / 159

83
4.2.5
Parts Inspection and measurement
(13) 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 strait-edge in two diagonal directions and on
four sides of the cylinder head, and measure distortion
with a thickness gage.
mm
Standard Limit
Distortion 0.05 or less 0.15
(c) Valve sink
Measure with the valve inserted to the cylinder head.
mm
Standard Limit
Intake 0.35 0.55 0.8
3IRH2N
(2-valve head) Exhaust
0.30 0.50 0.8
3IRH8N
4IRH8N
Intake 0.30 0.50 0.8
(2-valve head)
Exhaust 0.30 0.50 0.8
Intake 0.36 0.56 0.8
4IRI8N
4IRI8T
(4-valve head) Exhaust
0.35 0.55 0.8
(d) Seat contact
Apply a thin coat of minium on the valve seat. Insert
the valve in the cylinder and push it against the seat to
check seat contact.
Standard: Continuous contact all around