Boring Of Cylinders - Toyota Celica Supra 1986 Service And Repair Manual

EM-52
Size
0/S 0 .50
0/S 0. 75
0 /S 1.00
ENGINE MECHANICAL - Cylinder Block
•
·-·
Ou1side diameter
mm (in.)
83.43 - 83.48
13.2846 - 3.28661
83.68 - 83.73
13.2945 - 3.29651
83.93 - 83.98
13.3043 - 3.30631
lW.IHO
3. HONE NEW BUSHING AND CHECK PIN FIT IN
CONNECTING ROD
(a)
Hone the new bushing and check that the oil cle•-
ance is within the standard specification.
Stllndllrd oil clearance: 0.006 - 0.011 mm
(0.0002 - 0.0004 in.
I
(b) Check the pin l it at normal room temperature.
Coat the pin with engine oil and push the pin into the
rod with thumb pressure .
BORING OF CYLINDERS
1. SELECT OVERSIZED PISTON
0/S pistons with pins are available in the sizes listed.
Replace pistons in motclled sets. Take the largest bore
measured and select the oversized piston for that bore.
Bore all cylinders for the oversized piston selected .
2. CALCULATE DIMENSION TO BORE CYUNDERS
3.
(a} Using a micrometer. measure the piston diameter at
right engles to the piston pin center line, 22 mm (0.87
in.) from the pist0<1 head.
(b) Calculate
the
size each cylinder is to be rebored as
follows:
Size to be rebored • P
+
C - H
P
=
piston diameter
C
=
piston clearance
0 .06 - 0.08 mm (0.0024 - 0.0031 ln.)
H = allowance for honing
less than 0.02 mm (0.0008 ln.)
BORE AND HONE CYLINDERS TO CALCULATED
DIMENSIONS
H0<1ing amount: 0.02 mm (0.0008 ln.) maximum
CAUTION: Excess honing will destroy the finished
roundness.