JAC J2 User Manual



Maintenance Manual for J2 Sedan
Mechanical Part of Engine
71
3.
V
alve
guide
■ Check
the
gap between the
valve
guide and
the valve stem. Replace the corresponding
parts if the m
easurem
ent is out
of limit.
V
alve
guide
Standard value: 0.020-0.036mm
Limit: 0.10mm
■
Replacement
of
V
alve
guide
a.
Push
out t
he v
alve
guide
towards
the
cylinder
side b
y the
press.
b.
Rebore mounting hole
on
the valve
guide of
cylinder head to
make i
t matc
h increased
size of
valve
guide to be installed.
Attention:
■ Do not install the valve
guides wi
th the
same sizes
of old
ones. Re
-boring
mounting hole
on
the valve guide of cylinder head
Outer diameter of valve guide:
For the hole with diameter of 10.655-10.665mm,
extend the size of valve guide by
0.05mm.
For the hole with diameter of 10.855-10.865mm,
extend the size of valve guide by 0.25mm.
For the hole with diameter of 11.105-11.115mm,
extend the size of valve guide by
0.50mm.
c.
Press
the
valve
guide
till
its
protrusi
on
height
reaches the specified value.
Standard value: 23.0mm
Attention:
■ Use cold pressing method to install
valve gui
de fr
om upper side of cylinder head. Check
whether there ar
e cracks after pr
ess fitting.
■
After
valve
guide pressed in, insert a new
valve
to check
for smooth sliding o
f val
ve.
4.
V
alve
Seat
■ Check the
valve protrusion
height between
the end face of
valve stem
and
the
surface of
valve
spring seat. Replace the valve seat if the limit is exceeded.
Fig.1.1.050
Fig.1.1.051
Valve guide

Inner Diameter of Valve Conduit

Outer Diameter of Valve Stem

Protrusion
Height


JAC J2 Specifications

General

Brand	JAC
Model	J2
Category	Automobile
Language	English