Toyota 3R-B 1969, Repair Manual

Page: 38 / 193

E N G I N E - Major S e r v i c e 3-11
F ig . 3-9 Easy Method G1709
F i g . 3-10 V a lv e Guide V4671
Bushing Replacement
( 0 . 9 6 " ) above the cylinder head.
F ig . 3-11 Protrusion of G0826
V a lv e Guide
3. A ft e r installing the guide bushing,
ream the guide\bushing until the
specified
clea ran ces a re ob­
tained .
T h e finished diameter of the guide
bushing should be 9.01 ~ 9.03
mm (0.3550 ~ 0 . 3 5 5 8 " ) .
F i g . 3-12 Reaming V a lv e V3150
Guide Bushing
V a lv e
1. Check the valve fa c e s , and the
edge of the va lve head fo r pits,
g r o o v e s , s c o r e s and defects.
2. Check the valve stem fo r bent,
and g r o o v e s at the neck of the
valve stem .
3. Check the valve head fo r b u r r s ,
w a r p a g e , c ra c k and c o r r o s io n .
Replace it if e x c e ss iv ely w orn o r
dam aged.
4. If the valve head edge is w o r n ,
and is less than 0 . 8 mm ( 0 . 0 3 1 " )
fo r the intake, and 1.0 mm o r
0 .039" fo r the exhaust, replace the
v a l v e s .
F i g . 3-13 V a lv e Head G1624
E d g e T h ick n ess
5. Grind the v a lv e s to 4 5 ° . R em ove
only sufficient stock to c o r r e c t the
run-out, and to re m o ve the pits,
and g r o o v e s .
[ 0 9 2 0 1 - 4 0 0 10 )