JAC J2 User Manual



Maintenance Manual for J2 Sedan
Mechanical Part of Engine
70
Note: The parts with paint mark should be installed upwards.
⑥
 Install retaining seat for val
ve
spring.
⑦

Install
valve
cotter.
■
Use
the
valve
spring
compresso
r
during
the
installa
tion.
■
After installation, lightly
knock the
edge of valve stem with a rubber hammer
to
check
the
mounting condition.
⑧

Install
spark pl
ug with
the
spark p
lug soc
ket.
3) Check after
Disassembl
y
1. Valve
■
Check
whether
the
contact
between
valve
surfaces is proper. Renew the surface of valve
seat if the contact is uneven or incomplete.
■ Inspect thickness of valve edge. Replace
the
valve if the measurement is less than the
specified value.
For intake valve: 1.35-1.65mm
，

For exhaust valve: 1.85±0.15mm
■
Inspect the
total
length of
valve. Replace
the
valve if
the
measurement is
less than
specified value.
For intake valve:
89.51-90.01mm
，

For exhaust valve:
90.69-91.19mm
2.
V
alve
Spring
■
Check free
height of
valve spring. Replace
the
valve spring if
the measurement
is less
than
specified value.
■ Check
perpendicularity of
valve spring.
Replace
the
valve spring
if
the
measurement is
out
of
limit.
Standard value: 2°
Limit: 4°
Fig.1.1.048
Fig.1.1.049
Good

Bad

Bad

Contact
(required to be
at the center of
surface)
Thickness of
edge


JAC J2 Specifications

General

Brand	JAC
Model	J2
Category	Automobile
Language	English