Toyota 3R-B 1969, Repair Manual

Page: 41 / 193

3-14 E N G I N E - Major S e r v i ce
Push Rod
Inspect the push rods fo r damage,
bend and twist.
R ep lace the rod/s if n e c e s s a r y .
Cylinder Block
1. Check f o r c r a c k s , and damage
after cleaning the block thoroughly.
Minute c r a c k s not visible to the
naked e y e s may be detected with
an equipment if available.
R eplace the block if not s e r v ic e ­
able .
2. Check the w a te r leak from the
cylinder block by applying w a te r
p r e s s u r e of 5 kg/cm2 (70 psi).
If defective, rep a ir o r replace the
cylinder block.
3. Check the flatness of the cylinder
block gasket surface following the
p roce d u re recommended f o r the
cylinder head.
If the w a rp a g e ex c e ed s 0.05 mm
(0 .002" ) , grind the gasket surface
with a suitable surface grin d er.
F i g . 3-19 Checking C ylinder B0272
Block Flatness
C ylinder B o r e
1 . Check the cylinder b o re fo r out-
of-round and taper with a cylinder
b o r e gauge. Measure the diameter
of each cylinder b o re at the top,
middle, and bottom with the gauge
placed at right angle and parallel
to the cen ter line of the engine.
F i g . 3-20 Measuring Points G0833
of Cylinder B o r e
F ig . 3-21 Measuring B0273
Cylinder B o r e
2. Refinish the cylinders scored
badly, burned and/or w orn out-
of-round o r taper m ore than 0 .2
mm ( 0 . 0 0 8 " ) , and use o v e r s iz e
pistons.
If one cylinder b o re requires
boring, the rest also require
boring, and new o v e r s iz e pistons
must be fitted.
Cylinder b o r e ’. 88.00 ~ 88.03 mm
(3.4645 - 3 .4 6 51 ")
W e a r & taper limit: 0 .2 mm
(0 .0 0 8 " )
3. If the cylinder w a lls have minor
surface defects, but the out-of­
round and the taper a r e within the
limit, hone the cylinder w a l ls , and
also re m o ve the ridge with a ridge
r e a m e r , then install new pistons
with p r o p e r cle a ra n c e s .
L i m i t 0.05mm ( 0 . 0 0 2 " )