EM-137
F'ont
<D
Thrust
..
Dlfact
i
on
7"
<ll A.iel
-
,
1�:�on
TAe' t."
'oJ
Middle
3.
{bl Measure the cylinder bore dl&meter in thrust
direc
tion. (See page EM-tll) and lubtnllct the piston
diameter measurement from lhe cylinder bore
diameter measurement.
PI'ton oil clearance:
4A-F
0.06 - 0.08 10m {0.0024 - 0.0031 in.1
4A·GE 0.10 - 0.12 mm (0.0038 - 0.0047 inJ
I!
n
ot within specification, replace the piston
•.
I!
necessary, rebore or
replace
Ihe cylinder block.
INSPECT PISTON RING GROOVE CLEARANCE
Using
a feeler
gsuge. measu,e Ihe clearance between a
new
piston
ring a
nd the wall of the piston ring gloove.
PI.ton ring groove cleerance:
No,l 0.04 - 0.08 10m (0.0016 - 0.0031 in.l
No,2 O,Ol - 0.07 mm (0.00 1 2 - 0.0028 in.l
" the clearaf'ICe i, not within specification, replace the
piston.
4.
INSPECT PISTON RING END GAP
tal InMrt the pislon ring into the cy�nder bore.
fJl
Us,'ng a piston. push the poston nng a little beyond
the bottom of the
rir19
travel to 87
10m (0.43
inJ
from the top surface
01
the cylinder block.
(c) Using
II
feeler gauga.
measure
the end gap
.
Standerd piston ,Ing end g.p:
4A-F
No,
I
0.25 - 0.35 mm
(0,0098 - 0.0138 inJ
No. 2 0.15 - 0.30 mm
(0.0059 - 0.0118 in.)
Oil
0.10 - 0.60 mm
(O.OOli - 0.02l6 in.1
4A·()E No.
0.25 - 0.47 mm
\0.0098
-
0.0185 in.!
No. 2 0.20 - 0.42 mm
\0.0079 - 0.0166 in.)
Oi.
0.15
-
0.52 mm
(0.0059 - 0.0205 in.J
Ma)tlmum piston ,ing end gep:
4A-F
No. 1 1.07 mm (0.0421 in.)
No. 2 1.02 mm [0.0402 in.)
011
1.62 mm 10.0638 in.)
4A·GE
No. 1 1 .07 mm 10.0421 In.l
No. 2 1.02 mm (0.0402 InJ
Oil
1 . 1 2 mm (0,0441 In.!
II
the gap is
g.aater
than meximum. replace the piston
ring.
II
the
g
a
p is g,eater than maximum. even with a new
piston
ring. rebore
the cylinde' tind use an OIS piston
ring.
