Toyota 2F - Page 23

3 8
Fig. 3- 16
Fig. 3 - 16
Fig. 3-17
Fig. 3 · 18
+
EN GI NE SERV ICE - Cyl ind er H ea d
c
, .
Valve & Guide
1 Clean and cheek 1he valves tor wear
scores and
bending.
Check the valve s1em-10- valvo gu 1do
clearance
(1) lnser1 the valve siem 1n10 1ho guide
(2) Move the valve back and lor1h and
cheek the clearance as shown m 1he
figure
Fig. 3· 19
SST
,,
'
Fig. 3-20
~ 3
Measure 1h e valve s1em 0 11 clearance
Elo 1h intake and exhaust
(I) Moasure 1he inside diameter ol lhe
valve guide a1 several placos
Guide inside di&nleter:
8.01 - 8. 03 mm
10 .3154 - 0 .3161 in.)
12) Measure the valve stem d1ame1er
Stem diameter:
IN 7. 970 - 7. 986 mm
(0 . 3138 - 0. 3144 ln J
Cylinder head bore
14.000 - 14 018 mm
(05512 - 0.5519 m)
Over 14.018 mm
105519 rnJ
EX 7.960 - 7 . 976 mm Fig. 3· 21
I0.3134 - 0.3140 in J ----
13) Calculate lhe valve s10m 011 clca
ranee .
Stenl oil clearance:
- N ote -
STD IN 0.03 - 0 .0 6 mm
(0. 0012 - 0. 0024 ln J
EX
0. 04 - 0 . 07 mm
10.0016 - 0 . 0028 i nJ
Limit IN 0. 10 mm (0. 0039 ln l
EX
0. 12 mm (0. 0047 ln J
Measure at several places and use thf
maximum wear for calculation .
-
Guido bushu1g
Use STD
·-
Use O/S 005
59 min
(2 32 1nl
ENG IN E SERVICE - CylindorH oa d
3- 9
II the orl clearance exceeds tho hmn. rep-
lace
both the valve and guide
(1) Usrng SST. drrvo out lhe valve gurde
lrom the 1op end 1oward tho com·
bustron chamber
12)
(3)
{4)
SST (0920 I · 600 I ii
Measure lho cyl1ndo1 head bore for
the
valve guide bush111g
Se lec1 a busl1ing.
II 1he cyltnder head bore is more
1han 14018 m1 TI (0.5519.n), ma·
ch ine the bore 10 the following
di mension
Rebored cylinder head bore di ·
mens io n:
14 . 050 - 14 . 068 mm
(0. 5531 - 0. 6639 in .I
(5) 01llor en1 bushings ore used for 1hc
intake and cxhaus1