CYLINDER BLOCK
EM-101
C
D
E
F
G
H
I
J
K
L
M
A
EM
CAUTION:
If oversize piston is used, use it for all cylinders with oversize piston rings.
Outer Diameter of Piston
●
Measure the piston outer diameter with micrometer.
●
Measure point “H”(Distance from the top): 42 mm (1.65 in)
Piston to Cylinder Bore Clearance
●
Calculate by outer diameter of piston and inner diameter of cylinder bore (direction X, position B).
(Clearance) = (Inner diameter of cylinder bore) – (Outer diameter of piston)
●
If it exceeds the limit, replace piston/piston pin assembly. Refer to
EM-90, "HOW TO SELECT PISTON"
.
Reboring Cylinder Bore
1.
Cylinder bore size is determined by adding piston to cylinder bore clearance to piston outer diameter.
2.
Install main bearing caps, and tighten to the specified torque. Otherwise, cylinder bores may be distorted
in final assembly. Refer to
EM-85, "ASSEMBLY"
.
3.
Cut the cylinder bores.
NOTE:
●
When any cylinder needs boring, all other cylinders must also be bored.
●
Do not cut too much out of the cylinder bore at a time. Cut only 0.05 mm (0.0020in) or so in diameter at
a time.
4.
Hone cylinders to obtain specified piston to cylinder bore clearance.
5.
Measure the finished cylinder bore for out-of-round and taper.
NOTE:
Measurement should be done after the cylinder bore cools down.
Standard
: 92. 980 - 93. 010 mm (3.6606 - 3.6618 in)
PBIC0125E
PBIC0126E
Standard
: 0.010 - 0.030 mm (0.0004 - 0.0012 in)
Limit
: 0.08 mm (0.0031 in)
Rebored size calculation: D = A +B - C
where,
D: Bored diameter
A: Piston outer diameter as measured
B: Piston to cylinder bore clearance (standard value)
C: Honing allowance 0.02 mm (0.0008 in)