Service manual
4G6
ENGINE
<1993>
-
Piston and Connecting Rod
1
.CF;-q@g
5EN006E
6EN054E
INSPECTION
PISTON
(1) Replace the piston if scratches or seizure is evident on its
surfaces (especially the thrust surface). Replace the piston
if it is cracked.
PISTON PIN
(1) Insert the piston pin into the piston pin hole with a thumb.
You should feel a slight resistance. Replace the piston pin if
it can be easily inserted or there is an excessive play.
(2) The piston and piston pin must be replaced as an assembly.
PISTON RING
(1)
Check the piston ring for damage, excessive wear, and
breakage and replace if defects are evident. If the piston
has been replaced with a new one, the piston rings must
also be replaced with new ones.
(2) Check for the clearance between the piston ring and ring
groove. If the limit is exceeded, replace the ring or piston, or
both.
Standard value:
No. I
SOHC
4663,
DOHC Non-turbo
0.02
-
0.06 mm
(.OOOS
-
.0024
in.)
SOHC
4664,
DOHC Turbo
0.03
-
0.07 mm
(.0017
-
.0028
in.)
No. 2
SOHC
4G63,
DOHC
0.02
-
0.06 mm
(.OOOS
-
.0024
in.)
SOHC
4664
0.03
-
0.07 mm
LOO17
-
.0028
in.)
Limit: 0.1 mm
(.004
in.)
(3) Install the piston ring into the cylinder bore. Force it down
with a piston, its crown being in contact with the ring, to
correctly position it at right angles to the cylinder
v\;all.
Then,
measure the end gap with a feeler gauge.
If the ring gap is excessive, replace the piston ring.
Standard value:
No. I
SOHC
0.25
-
0.35 mm
(.0098
-
.0138
in.)
DOHC
0.25
-
0.40 mm
(.0098
-
.0157
in.)
No. 2
SOHC
-
8VALVE,
DOHC
0.45
-
0.60 mm
(.0177
-
.0236
in.)
SOHC
-
IGVALVE
0.40
-
0.55
mm
(.Ol57
-
.0217
in.)
Oil ring
SOHC
-
8VALVE
0.20
-
0.60 mm
(.0079
-
.0236
in.)
SOHC
-
IGVALVE
0.10
-
0.40 mm
(.0039
-
.0157
in.)
DOHC
0.13
-
0.38 mm
(.0051
-
.0150
in.)
Limit:
No. 1, No. 2
0.8 mm
(.031
in.)
Oil
1.0
mm
(.039
in.)
TSB Revision